A MODULAR AND SKID-MOUNTED WASTE WATER TREATMENT SYSTEM FOR TREATING AND RECYCLING WASTE WATER

Abstract

The present invention provides a waste water treatment system (100) designed to efficiently treat and recycle waste water for reuse in non-potable applications, such as gardening, toilet flushing, general cleaning and other suitable process. The treated water can also made potable suitably by adding end of line multistage filters including micron/ cartridge filters, Ultrafilters (UF), Reverse osmosis filters (RO), Ultra-Violet (UV) filters. The waste water treatment system incorporates a multi-stage process starting with a flocculation unit (102), where contaminants in waste water are treated with flocculants to create flocs. These flocs are then separated in a dissolved air flotation (DAF) tank (104), where a specialized nozzle (140) generates micronized bubbles under pressure to lift and collect the sludge. A multistage high-pressure pump (106) and a gas-liquid mixer (108) enable optimal bubble generation, while a skimming unit (110) continuously removes sludge, sending it to a collection tank (112). Additional filtration units, including multimedia (114A), activated charcoal (114B), and resin filters (114C), further purify the water, supported by a disinfection dosing pump (114D). The system (100) is skid-mounted, enabling plug-and-play installation and convenient operation. FIG. 1

Specification

Description:BACKGROUND
Technical Field
[0001] The present invention pertains to the technical field of waste water management, specifically focusing on a waste water treatment system engineered for efficient contaminant removal and waste water recycling utilizing processes such as flocculation, dissolved air flotation (DAF), and multi-stage filtration to achieve high treatment efficiency.
Description of the Related Art
[0002] Traditional waste water treatment systems are often intensive in civil infrastructure, necessitating significant real estate space, material, time, and labor for construction and installation. These systems generally depend on blowers and compressors operating continuously, which contributes to excessive noise and maintenance demands, as well as the generation of large air bubbles (typically around 50 microns), which limits effective surface area for contaminant interaction. Further, conventional systems also have high electrical load requirements due to their reliance on blower-based aeration, increasing both operational costs and the need for high power capacity. The supply, installation, and commissioning processes for these setups are time-consuming, often taking six months or more, and the process itself is frequently conducted in batches, with each batch taking more than four hours to complete. This prolonged batch processing further requires larger storage tanks, increasing space and material costs.
[0003] Operational complexity adds to these challenges, as skilled labor is essential to manage the system, which raises labor costs and complicates operations for users. Many components used in conventional systems are custom-made and available only through specific suppliers, making replacement costly and difficult to source. Attempts to overcome these issues have been limited in their effectiveness. Electro-coagulation technology, for instance, has been explored as a potential solution, particularly for optimizing treatment times, but it requires high electricity input and frequent electrode replacement, making it costly to operate. Additionally, its handling capacity is limited to less than 50 kiloliters per day, restricting its scalability. Other approaches, such as Membrane Bioreactor (MBR), Sequencing Batch Reactor (SBR), and Moving Bed Biofilm Reactor (MBBR) systems, attempt to reduce real estate requirements but fail to optimize process time, space, and energy efficiency, remaining costly and power-intensive options. These shortcomings underscore the need for an innovative approach that minimizes space and energy requirements, reduces noise, and can operate continuously with minimal maintenance and lower power demand.
[0004] Therefore, there arises a need to address the aforementioned technical drawbacks in existing technologies by providing an efficient, compact, and sustainable waste water treatment system, particularly for domestic and industrial applications where conventional waste water treatment methods fall short.

SUMMARY OF THE INVENTION
[0005] The first aspect of the present invention provides a modular and skid-mounted waste water treatment system for treating and recycling waste water. The system includes a flocculation unit including a plurality of tubes configured to flocculate contaminants in the waste water with an added flocculant. A dissolved air flotation (DAF) tank is configured to separate and lift flocculated sludge using radical and micronized bubbles generated by a nozzle. The nozzle is designed to create radical microbubbles of less than 10 microns in size through a venturi effect. A coagulant is added to the DAF tank to coagulate the flocculated contaminants. A multistage high-pressure pump is configured to circulate the waste water and pressurize the waste water to 6 to 8 bars for the bubble generation. A gas and liquid mixer uniformly mix air with the waste water for the bubble generation. A sludge skimming unit continuously removes the sludge from the surface of the dissolved air flotation (DAF) tank. The removed sludge is collected in a sludge collection tank through a sludge outlet. A series of secondary filtration units including a multimedia filter, an activated charcoal filter, a resin filter, and a disinfectant dosing pump filters sludge removed water to obtain a filtered and disinfected water for reuse in utility applications including gardening, toilet flushing, general cleaning and other suitable processes.
[0006] In some embodiments, the system includes (i) a waste water inlet line to receive the waste water from domestic or industrial sources, (ii) a bar screen unit configured to remove physical particles from the waste water, (iii) an equalisation tank for storing the waste water, pH level of the waste water is adjusted using a pH correction dosing pump, and (iv) a waste water lifting pump to transfer the waste water from the equalization tank to the flocculation unit.
[0007] In some embodiments, the system includes a rotameter configured to measure and monitor flow rate of the waste water from the equalisation tank into the flocculation unit.
[0008] In some embodiments, the system includes a flocculant dozing pump to dose the flocculant to the waste water in the flocculation unit and a coagulant dozing pump to dose the coagulant to the dissolved air flotation (DAF) tank.
[0009] In some embodiments, the system includes (i) a globe valve to control the flow rate of the flocculated water to attain a pressure to inject the radical microbubble to the dissolved air flotation (DAF) tank, and (ii) a first pressure gauge to measure and monitor the pressure of the flocculated water outflow from the multistage high-pressure pump, (iii) a second pressure gauge to measure and monitor the pressure of the inflow of the radical microbubble to the dissolved air flotation (DAF) tank (104) at 3-5 bar from the gas and liquid mixer.
[0010] In some embodiments, the sludge collection tank includes a sludge lifting pump to pump the sludge to a sludge filter unit that dewaters the sludge and separate dry sludge from sludge water. The separated sludge water is sent back to the bar screen unit.
[0011] In some embodiments, the plurality of tubes of the flocculation unit and the dissolved air flotation (DAF) tank is made of temperature and chemical resistant poly propylene with mild steel support.
[0012] In some embodiments, the system includes a main control panel board with a variable frequency drive (VFD) and a human-machine interface (HMI) for managing and monitoring system operations.
[0013] In some embodiments, the multimedia filter is configured to remove suspended solids, the activated charcoal filter is configured to reduce odor and residual contaminants, the resin filter is configured to remove hardness ions, including calcium and magnesium, and the disinfectant dosing pump doses disinfectants to reduce organic and microbial load.
[0014] In some embodiments, the sludge removed water from the dissolved air flotation (DAF) tank is introduced into the series of secondary filtration units using a filter feed pump.
[0015] In some embodiments, the nozzle includes an air suction point for suction of atmosphere air at a venturi point.
[0016] In some embodiments, the sludge skimming unit includes one or more constantly moving skimmer blades driven by a skimmer gear motor to remove the sludge from the surface of the dissolved air flotation (DAF) tank.
[0017] In some embodiments, the gas and liquid mixer includes one or more vents to vent the excess air build-up in the gas and liquid mixer.
[0018] In some embodiments, the system is designed as a plug-and-play unit for ease of installation and operation.
[0019] The second aspect of the present invention provides a method of treating and recycling waste water using a waste water treatment system. The method includes (i) introducing the waste water into a flocculation unit including a plurality of tubes, and adding a flocculant to the waste water to flocculate contaminants, (ii) directing the flocculated waste water to a dissolved air flotation (DAF) tank, a coagulant is added to the DAF tank to coagulate the flocculated contaminants, promoting sludge formation, (iii) generating radical and microbubbles of less than 10 microns in size through a nozzle utilizing a venturi effect and lifting the flocculated sludge to the surface of the DAF tank, (iv) circulating the waste water in the DAF tank with a multistage high-pressure pump that pressurizes the waste water to 6 to 8 bars, a gas and liquid mixer is used to mix air uniformly with the waste water for enhanced bubble formation in the DAF tank, (v) skimming the sludge continuously from the surface of the DAF tank using a sludge skimming unit and transferring the removed sludge to a sludge collection tank through a sludge outlet, (vi) passing sludge removed water from the DAF tank through a series of secondary filtration units including, a multimedia filter to remove fine suspended solids, an activated charcoal filter to reduce odor and residual contaminants, a resin filter to remove calcium and magnesium ions, reducing hardness, a disinfectant dosing pump to introduce a disinfectant for microbial load reduction, and (vii) collecting the filtered and disinfected water for reuse in utility applications, including gardening, toilet flushing, general cleaning and other suitable processes.
[0020] The waste water treatment system of the present invention offers numerous advantages in terms of treatment efficiency, power and space savings, and sustainability. Designed to occupy a smaller real estate footprint, the compact, skid-mounted, and modular system reduces the need for civil structures, construction materials, and labor. It is highly energy-efficient, with minimal power demand due to a unique radical bubble generation technology that operates without blowers or compressors, thus lowering energy consumption. Using mechanical nozzles, it generates radical microbubbles under 10 microns, increasing the surface area for contaminant interaction and enhancing treatment efficiency in a short process time of up to 60 minutes. The absence of blowers also minimizes noise and odor, making it ideal for hospitals, hotels, hostels, office spaces, industries and residential areas. Skid-mounted, plug-and-play design makes the system portable and easy to install, operate, and relocate. Maintenance demands are low, and with semi-automated operation and reliance on standard, locally available components, the system is user-friendly and does not require skilled labor. Furthermore, the system can be installed and commissioned within three months, significantly reducing project timelines. Unlike systems that rely on microbial processes, the system leverages hydroxyl (OH) radicals to neutralize positively charged contaminants, achieving effective treatment regardless of microbial load. Further, the OH radicals break the cell wall of the microflora thereby reducing the microbial load. Versatile in its applications, the system is suited to treat both domestic and industrial waste water, recycling it for reuse in utility functions such as gardening, toilet flushing, general cleaning, and industrial processes, thereby supporting water conservation in settings like apartments, hospitals, hotels, and water-intensive industries. It has been successfully trialed on various waste water types, including those from vehicle service stations, dairy facilities, water jet looms, electroplating industries, commercial laundries and natural water bodies like lakes and open wells. Additionally, it provides effective treatment across diverse sectors, serving as a primary treatment solution in sewage treatment plants (STPs) for domestic waste water, effluent treatment plants (ETPs) for industrial effluents, and for the cleaning and rejuvenation of water bodies such as lakes and rivers. The system's innovative components, including flocculation tubes, radical bubble nozzles, and mixers, optimize aeration and space efficiency, making the system a sustainable, low-maintenance solution for various waste water treatment needs.
[0021] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The embodiments herein will be better understood from the following detailed description with reference to the drawings, in which:
[0023] FIG.1 is a modular and skid-mounted waste water treatment system for treating and recycling waste water according to some embodiments herein;
[0024] FIG.2 illustrates the flocculation unit of FIG.1 according to some embodiments herein;
[0025] FIG.3 illustrates a cross-sectional view of the nozzle of FIG.1 according to some embodiments herein;
[0026] FIG.4 illustrates the gas and liquid mixer of FIG.1 according to some embodiments herein;
[0027] FIG.5 illustrates the sludge skimming unit of FIG.1 according to some embodiments herein;
[0028] FIGS. 6A-B illustrate a flow chart describing a method of treating and recycling waste water using a modular and skid-mounted waste water treatment system according to some embodiments herein.
DETAILED DESCRIPTION OF THE DRAWINGS
[0029] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0030] There remains a need to address the technical drawbacks of existing waste water treatment technologies by providing a compact, efficient system that reduces infrastructure requirements, operational costs, and power consumption while maintaining high treatment effectiveness. The present invention minimizes real estate footprint and construction demands, utilize lower power requirements without the need for continuous blowers or compressors, and capable of generating radical microbubbles smaller than 10 microns. The system operates continuously, with minimal maintenance, reduced noise, and limited dependence on skilled manpower, facilitating easier management and faster installation. Furthermore, the system offers a cost-effective and modular design, suitable for plug-and-play installation to streamline setup. The present invention integrates advanced components that improve contaminant removal, enhance energy efficiency, and enable the recycling and reuse of treated waste water for various utility applications, ultimately delivering a robust and user-friendly waste water treatment solution. Referring now to the drawings, and more particularly to FIGS. 1 through 6, where similar reference characters denote corresponding features consistently throughout the figures, preferred embodiments are shown.
[0031] FIG.1 is a modular and skid-mounted waste water treatment system for treating and recycling waste water according to some embodiments herein. The system 100 includes a flocculation unit 102, a dissolved air flotation (DAF) tank 104, a multistage high-pressure pump 106, a gas and liquid mixer 108, a sludge skimming unit 110, a sludge collection tank 112, a series of secondary filtration units comprising a multimedia filter 114A, an activated charcoal filter 114B, a resin filter 114C, and a disinfectant dosing pump 114D, a waste water inlet line 116, a bar screen unit 118, an equalisation tank 120, a waste water lifting pump 122, a rotameter 124, a flocculant dozing pump 126, a coagulant dozing pump 128, a globe valve 130, a first pressure gauge 132A, a second pressure gauge 132B, a sludge lifting pump 134, a sludge filter unit 136, a pH correction dosing pump 138, a nozzle 140, an air suction point 142, a main control panel board 144, a sludge outlet 146, a filter feed tank 148, a filter feed pump 150, a treated water tank 152 and the skimmer gear motor 154.
[0032] The waste water from domestic or industrial sources is introduced into the bar screen unit 118 through the waste water inlet line 116. The bar screen unit 118 is configured to remove physical particles from the waste water. The physical particles removed waste water is stored in the equalisation tank 120 and the pH level of the waste water in the equalisation tank 120 is adjusted using a suitable pH-adjusting compound dosed through the pH correction dosing pump 138. The pH-adjusted waste water from the equalisation tank 120 is pumped into the flocculation unit 102 using the waste water lifting pump 122. The flocculation unit 102 includes a plurality of tubes configured to flocculate contaminants in the waste water using suitable flocculants dosed through the flocculant dozing pump 126. The plurality of tubes of the flocculation unit 102 is made of temperature and chemical resistant poly propylene material with suitable mild steel support. The waste water is pumped into the flocculation unit 102 to create flocculation with the help of the flocculants. The length & diameter of the flocculation unit 102 is designed to aid efficient flocculation of the contaminants present in the waste water. The rotameter 124 is configured to measure and monitor flow rate of the waste water from the equalisation tank 120 into the flocculation unit 102. The flocculated waste water is directed into the dissolved air flotation (DAF) tank 104 configured to separate the flocculated contaminants as sludge through coagulation. Suitable coagulants are added to the DAF tank 104 through the coagulant dozing pump 128 to coagulate the flocculated contaminants to facilitate the sludge formation.
[0033] The dissolved air flotation (DAF) tank 104 is specially designed based on the required flow rate & capacity. The dissolved air flotation (DAF) tank 104 is made of a chemical resistant poly propylene material with suitable mild steel support. The sludge is lifted to the surface of the dissolved air flotation (DAF) tank 104 with aid of pressurized radical microbubbles. The waste water in the dissolved air flotation (DAF) tank 104 is pressurized to about 6-8 bar using the multistage high-pressure pump 106. The nozzle 140 is used to generate radical microbubble of < 10 micron through venturi effect. The pressurized radical microbubbles increase the waste water treatment efficiency as the surface area is increased with the increase in number of bubbles. The nozzle 140 includes an air suction point 142 for suction of atmosphere air at a venturi point. The first pressure gauge 132A is used to measure and monitor the pressure of the flocculated water outflow from the multistage high-pressure pump 106. The gas and liquid mixer 108 uniformly mix the air with the waste water for the bubble generation. The main control panel board 144 with a variable frequency drive (VFD) and a human-machine interface (HMI) is used for managing and monitoring system operations. The globe valve 130 is used to control the flow rate of the flocculated water to attain desired pressure to inject the radical microbubble to the dissolved air flotation (DAF) tank 104 and the second pressure gauge 132B is used to measure and monitor the pressure of the inflow of the radical microbubble to the dissolved air flotation (DAF) tank 104 at about 3-5 bar from the gas and liquid mixer 108.
[0034] The levitated sludge generated in the dissolved air flotation (DAF) tank 104 is skimmed out using the sludge skimming unit 110 that includes one or more constantly moving skimmer blades driven by the skimmer gear motor 154 to remove the sludge from the surface of the dissolved air flotation (DAF) tank 104. The removed sludge is collected in the sludge collection tank 112 through the sludge outlet 146.
[0035] The sludge lifting pump 134 in the sludge collection tank 112 is used to pump the sludge to the sludge filter unit 136. The sludge filter unit 136 is used to dewater the sludge slurry and separate the dry sludge from the sludge water. The separated water from sludge filter unit 136 is sent the bar screen unit 118. Dry sludge from the sludge filter unit 136 is separated & disposed as per PCB- Pollution Control Board Norms. The sludge removed water from the dissolved air flotation (DAF) tank 104 is stored in the filter feed tank 148 and introduced into the series of secondary filtration units using a filter feed pump 150.
[0036] The series of secondary filtration units obtain a treated water for reuse in utility applications including gardening, toilet flushing, general cleaning and other suitable processes. The series of secondary filtration units includes the multimedia filter 114A composed of sand, gravel to filter the fine suspended solid particles present in the sludge removed water, an activated charcoal filter 114B composed of activated charcoal pieces to reduce odor, smell present in the sludge removed water, a resin filter 114C composed of resin beads to remove the calcium and magnesium carbonates by reducing the total hardness in the sludge removed water, thus obtaining the treated water. Depending on the hardness of the source water such as that from municipal supplies, bore wells, or tankers a resin softener filter may be added to prevent scaling in plumbing lines and fittings. The treated water is stored in a treated water tank 152 and dosed with standard disinfectants to reduce the residual, organic/ microbial load using the disinfectant dosing pump 114D. Additionally, the treated water can also be made potable by incorporating end-of-line multistage filters, including micron/cartridge filters, ultrafilters (UF), reverse osmosis filters (RO), and ultraviolet (UV) filters.
[0037] FIG.2 illustrates the flocculation unit 102 of FIG.1 according to some embodiments herein. The flocculation unit 102 includes a flocculation unit waste water inlet 202, a flocculant dozing point 204, a drain valve 206, an air vent valve 208 and a flocculated waste water outlet 210. The pH-adjusted waste water from the equalisation tank 120 is pumped into the flocculation unit 102 via the rotameter 124 through the waste water inlet 202. Suitable flocculants are dosed at the flocculant dozing point 204 to aid flocculation of the contaminants including the impurities / pollutants present in the waste water. The drain valve 206 is used to drain the waste water in case of maintenance. The drain valve 206 can be used as sampling point for testing purpose. The air vent valve 208 is used to release any air accumulation in the flocculation unit 102 to aid free flow of the waste water. The flocculated waste water from the flocculation unit 102 is directed into the dissolved air flotation (DAF) tank 104 through the flocculated waste water outlet 210.
[0038] FIG.3 illustrates a cross-sectional view of the nozzle 140 of FIG.1 according to some embodiments herein. The cross-sectional view 300 of the nozzle 140 includes a nozzle flocculated water inlet 302, the air suction point 142 and a nozzle waste water outlet 304. The flocculated water from the multistage high-pressure pump 106 is passed into the nozzle 140 through the nozzle waste water inlet 302 at a pressure of 6-8 bars. The air suction point 142 point is used for suction of the atmosphere air at the venturi point or any other desired air component depending on the waste water. The flocculated water with radical and microbubbles flows out of the nozzle 140 through the nozzle flocculated water outlet 304.
[0039] FIG.4 illustrates the gas and liquid mixer 108 of FIG.1 according to some embodiments herein. A gas and liquid inlet 408, a drain 404, one or more air vent 406A-D, a gas and liquid outlet 402. From the nozzle 140, the flocculated water with radical and micronized bubbles is passed into the gas and liquid mixer 108 through the gas and liquid inlet 408 at a pressure of 6-8 bars. To drain out the flocculated water in case of the shutdown or breakdown period the drain 404 is used. The one or more air vent 406A-D are used to vent the excess air built-up in the gas and liquid mixer 108 due to high pressure and also to remove the air lock if occurred. Equally mixed waste water with the radical and microbubbles flow to the DAF tank 104 through the gas and liquid outlet 402.
[0040] FIG.5 illustrates the sludge skimming unit 110 of FIG.1 according to some embodiments herein. Sludge formed and levitated in DAF tank 104 is removed with the sludge skimming unit 110 including constantly moving skimmer blades 502A-E driven by skimmer gear motor 154. FIG.5 shows the high-pressure pump 106.
[0041] FIGS. 6A-B illustrate a flow chart describing a method of treating and recycling waste water using a modular and skid-mounted waste water treatment system according to some embodiments herein. At step 602, the method includes introducing the waste water into a flocculation unit including a plurality of tubes, and adding a flocculant to the waste water to flocculate contaminants. At step 604, the method includes directing the flocculated water to a dissolved air flotation (DAF) tank. A coagulant is added to the DAF tank to coagulate the flocculated contaminants, promoting sludge formation. At step 606, the method includes generating radical and microbubbles of less than 10 microns in size through a nozzle utilizing a venturi effect and lifting the flocculated sludge to the surface of the DAF tank. At step 608, the method includes circulating the flocculated water in the DAF tank with a multistage high-pressure pump that pressurizes the flocculated water to 6 to 8 bars. A gas and liquid mixer is used to mix air uniformly with the flocculated water for enhanced bubble formation in the DAF tank. At step 610, the method includes skimming the sludge continuously from the surface of the DAF tank using a sludge skimming unit and directing the removed sludge to a sludge collection tank through a sludge outlet. At step 612, the method includes passing sludge removed water from the DAF tank through a series of secondary filtration units including, a multimedia filter to remove fine suspended solids, an activated charcoal filter to reduce odor and residual contaminants, a resin filter to remove calcium and magnesium ions, reducing hardness, a disinfectant dosing pump to introduce a disinfectant for residual microbial load reduction. At step 614, the method includes collecting the filtered and disinfected water for reuse in utility applications, including gardening, toilet flushing, general cleaning and other suitable processes.
[0042] The described combination of steps effectively clarifies waste water by reducing Total Suspended Solids (TSS) and enhancing aeration, which in turn reduces Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) as well as oil and grease content, thereby improving overall water quality. Additionally, the advanced aeration process in the System minimizes sludge production, creating less sludge compared to conventional systems. The system significantly improves waste water treatment efficiency, offering a reduced processing time of 30 to 60 minutes depending on waste water characteristics. Unlike conventional systems, the system requires considerably less space and a lower connected electrical load, making it both compact and energy-efficient. Specifically, a 40 KLD capacity setup occupies just 50 sq. ft. with a 4 KW load, while a 120 KLD system needs only 60 sq. ft. and 5.5 KW. For larger capacities, the 200 KLD system requires 100 sq. ft. with a 7 KW load, and the 500 KLD system fits within 300 sq. ft. with a 12 KW load. This compact design minimizes the need for real estate and operational power, providing a cost-effective solution for efficient waste water treatment.
[0043] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the appended claims.


, Claims:I/We claim:
1. A modular and skid-mounted waste water treatment system (100) for treating and recycling waste water, wherein the system (100) comprises,
a flocculation unit (102) comprising a plurality of tubes configured to flocculate contaminants in the waste water with an added flocculant;
a dissolved air flotation (DAF) tank (104) configured to separate and lift flocculated sludge using radical and micronized bubbles generated by a nozzle (140), wherein the nozzle (140) is designed to create radical microbubbles of less than 10 microns in size through a venturi effect, wherein a coagulant is added to the dissolved air flotation (DAF) tank (104) to coagulate the flocculated contaminants;
a multistage high-pressure pump (106) configured to circulate the waste water and pressurize the waste water to 6 to 8 bars for the bubble generation;
a gas and liquid mixer (108) for uniform mixing of air with the waste water for the bubble generation;
a sludge skimming unit (110) to continuously remove the sludge from the surface of the dissolved air flotation (DAF) tank (104), wherein the removed sludge is collected in a sludge collection tank (112) through a sludge outlet (146); and
a series of secondary filtration units comprising a multimedia filter (114A), an activated charcoal filter (114B), a resin filter (114C), and a disinfectant dosing pump (114D), wherein the filtration units filter sludge removed water to obtain a filtered and disinfected water for reuse in utility applications comprising gardening, toilet flushing, general cleaning and other suitable processes.
2. The waste water treatment system (100) as claimed in claim 1, wherein the system (100) comprises,
a waste water inlet line (116) to receive the waste water from domestic or industrial sources;
a bar screen unit (118) configured to remove physical particles from the waste water;
an equalisation tank (120) for storing the waste water, wherein pH level of the waste water is adjusted using a pH correction dosing pump (138); and
a waste water lifting pump (122) to transfer the waste water from the equalisation tank (120) to the flocculation unit (102).
3. The waste water treatment system (100) as claimed in claim 2, wherein the system (100) comprises a rotameter (124) configured to measure and monitor flow rate of the waste water from the equalisation tank (120) into the flocculation unit (102).
4. The waste water treatment system (100) as claimed in claim 1, wherein the system (100) comprises a flocculant dozing pump (126) to dose the flocculant to the waste water in the flocculation unit (102) and a coagulant dozing pump (128) to dose the coagulant to the dissolved air flotation (DAF) tank (104).
5. The waste water treatment system (100) as claimed in claim 1, wherein the system (100) comprises a (i) globe valve (130) to control the flow rate of the flocculated water to attain a pressure to inject the radical microbubble to the dissolved air flotation (DAF) tank (104), and (ii) a first pressure gauge (132A) to measure and monitor the pressure of the flocculated water outflow from the multistage high-pressure pump (106), (iii) a second pressure gauge (132B) to measure and monitor the pressure of the inflow of the radical microbubble to the dissolved air flotation (DAF) tank (104) at 3-5 bar from the gas and liquid mixer (108).
6. The waste water treatment system (100) as claimed in claim 1, wherein the sludge collection tank (112) comprises a sludge lifting pump (134) to pump the sludge to a sludge filter unit (136) that dewaters the sludge and separate dry sludge from sludge water, wherein the separated sludge water is sent back to the bar screen unit (118).
7. The waste water treatment system (100) as claimed in claim 1, wherein the plurality of tubes of the flocculation unit (102) and the dissolved air flotation (DAF) tank (104) is made of temperature and chemical resistant poly propylene material with mild steel support.
8. The waste water treatment system (100) as claimed in claim 1, wherein the system (100) comprises a main control panel board (144) with a variable frequency drive (VFD) and a human-machine interface (HMI) for managing and monitoring system operations.
9. The waste water treatment system (100) as claimed in claim 1, wherein the multimedia filter (114A) is configured to remove suspended solids, wherein the activated charcoal filter (114B) is configured to reduce odour and residual contaminants, wherein the resin filter (114C) is configured to remove hardness ions, comprising calcium and magnesium, wherein the disinfectant dosing pump (114D) doses disinfectants to reduce residual organic and microbial load.
10. The waste water treatment system (100) as claimed in claim 1, wherein the sludge removed water from the dissolved air flotation (DAF) tank (104) is introduced into the series of secondary filtration units using a filter feed pump (150).
11. The waste water treatment system (100) as claimed in claim 1, wherein the nozzle (140) comprises an air suction point (142) for suction of atmosphere air at a venturi point.
12. The waste water treatment system (100) as claimed in claim 1, wherein the sludge skimming unit (110) comprises one or more constantly moving skimmer blades (502A-E) driven by a skimmer gear motor (154) to remove the sludge from the surface of the dissolved air flotation (DAF) tank (104).
13. The waste water treatment system (100) as claimed in claim 1, wherein the gas and liquid mixer (108) comprises one or more vents (406A-D) to vent the excess air build-up in the gas and liquid mixer (108).
14. The waste water treatment system (100) as claimed in claim 1, wherein the system (100) is designed as a plug-and-play unit for ease of installation and operation.
15. A method of treating and recycling waste water using a modular and skid mounted waste water treatment system (100), wherein the method comprises,
introducing the waste water into a flocculation unit (102) comprising a plurality of tubes, and adding a flocculant to the waste water to flocculate contaminants;
directing the flocculated waste water to a dissolved air flotation (DAF) tank (104), wherein a coagulant is added to the DAF tank (104) to coagulate the flocculated contaminants, promoting sludge formation;
generating radical and micronized bubbles of less than 10 microns in size through a nozzle (140) utilizing a venturi effect and lifting the flocculated sludge to the surface of the DAF tank (104);
circulating the waste water in the DAF tank (104) with a multistage high-pressure pump (106) that pressurizes the waste water to 6 to 8 bars, wherein a gas and liquid mixer (108) is used to mix air uniformly with the waste water for enhanced bubble formation in the DAF tank (104);
skimming the sludge continuously from the surface of the DAF tank (104) using a sludge skimming unit (110) and directing the removed sludge to a sludge collection tank (112) through a sludge outlet (146);
passing sludge removed water from the DAF tank (104) through a series of secondary filtration units comprising, a multimedia filter (114A) to remove fine suspended solids, an activated charcoal filter (114B) to reduce odor and residual contaminants, a resin filter (114C) to remove calcium and magnesium ions, reducing hardness, a disinfectant dosing pump (114D) to introduce a disinfectant for residual microbial load reduction; and
collecting the filtered and disinfected water for reuse in utility applications, including gardening, toilet flushing, general cleaning and other suitable processes.

Dated this 20th November 2024,
Signature of the Patent Agent:
Arjun Karthik Bala
IN/PA - 1021

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