A waste water treatment system and a method for waste water treatment

Abstract

The present invention relates to a waste water treatment system (100), comprising of, a sewage water inlet (1); and at least one container (2) having a plurality of treatment units. The sewage water inlet (1) transfers waste water that is coming from a sewage source into said container (2) having said plurality of treatment units. Further, the plurality of treatment units include a pre-treatment unit (3), a primary treatment unit (4), a secondary treatment unit (5), and a tertiary treatment unit (6); and said plurality of treatment units are prefabricated, preassembled and integrated inside said container (2) to make said system (100) portable / relocatable, compact, decentralized, and prevents theft, vandalism and eventualities that occur during cleaning or servicing operation. The waste water treatment system (100) of the present invention is having volume capacity ranging from 2 kld to 2 mld.

Description

[0001] “A WASTE WATER TREATMENT SYSTEM AND A METHOD FOR WASTE WATER TREATMENT”

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to the field of waste water treatment. More particularly, the present invention relates to a decentralized, portable / relocatable, compact and containerized waste water treatment system that is having prefabricated and preassembled components, based on dual treatment technology of moving bed bioreactor and multistage reactors and a fully automated control mechanism that delivers recycled water at door step.

[0004] BACKGROUND OF THE INVENTION

[0005] Earth covers 70% with water and 30% with land, however, freshwater is of 3% and two-third of that is locked in frozen glaciers, which is unavailable. Besides this, the 1.2% of freshwater is contaminated by wastewater coming from homes, industries etc., which is a huge problem for ecosystem. Industries and household collectively produces a large volume of waste water and to resolve this issue, waste water treatment systems were developed as the wastewater must be treated before releasing into any water body like pond or river. According to a survey, 80% of waste water is discharged with minimal treatment or no prior treatment, thereby directly polluting our fresh surface water or indirectly polluting the groundwater leading to waterborne diseases.

[0006] Generally, the methods for waste water treatment comprise the steps of coarse screening, fine screening, degritting, primary treatment, secondary treatment and disinfection of the treated water to improve the quality. The basic processes involved in any waste water treatment system consists of three stages, i.e., physical processes, biological processes, and chemical processes. However, the whole process is timeconsuming and expensive to implement. With the progressive development in the field of waste water treatment, several automated systems were introduced, however, the currently available systems have civil construction and open tanks which are prone to accidents, theft and vandalism. Moreover, separate parts of the system have to be assembled, which is not possible in hilly regions. There are several waste water treatment systems available in the market, but they all face issues like complex servicing, excessive amount of foul smell, expensive installation, requirement of huge space, as waste water treatment plant is required to have enough space to position the system and also the appropriate arrangement for the treated water to be dispensed out.

[0007] WO2014186856A1 discloses about an aerobic waste water treatment system, which uses Pseudomonas sp-type bacteria .NitrosomonaS, Nitrobacter, Nitrosococcus, Azobacter, Azotomonas and Rhizobium) in the steps of decantation, flocculation and filtration, wherein sugarcane bagasse, left over from the sugar industry, or similar organic wastes, such as wheat straw, barley straw and corn stover, is used as an excipient for the bacteria, and the system allows the quantity of bacteria required for the volume of waste water in the waste water treatment plant to be manually or automatically controlled and supplied. However, the document fails to provide a water treatment system that is cost effective, prefabricated, decentralized, portable, fully integrated with geographical adoptability.

[0008] US20150108065A1 discloses about a method for waste water treatment in a bioreactor, comprising of recycling organic sludge in the bioreactor to supply carbon sources for removing nitrogen and phosphor and increase organic loading of the reactor, and adjusting operational parameters for the bioreactor to form facultative- anaerobic environment or anaerobic environment in the bioreactor. By following the method of the present invention, recycling sludge and simultaneously removing nitrogen and phosphor are completed such that the treatment processes for waste water disposal are simplified; the sludge is recycled as carbon sources in the bioreactor such that saving resources is realized and the carbon emission into atmosphere is reduced; and zero-amount sludge is discharged such that harm from secondary pollution is avoided. However, this invention fails to provide a water treatment system or method that is cost effective, prefabricated, decentralized, portable, fully integrated with geographical adoptability.

[0009] US7658851B2 discloses a device and method for growing aerobic and facultative anaerobic bacteria such as Pseudomonas fluorescens, Bacillus subtilis, Bacillus licheniformis, Starkeya novella and various autotrophic sulfur metabolizing bacteria, along with methods for releasing these bacteria into suspended growth or fixed film waste water treatment zones such as soil or media, for the purposes of bioremediation and the removal of nitrogen, sulfur, and carbon wastes. However, this invention fails to provide a water treatment system or method that is cost effective, prefabricated, decentralized, portable, fully integrated with geographical adoptability.

[0010] Several types of waste water treatment system and methods are available, however, there is no automated system or method, which effectively deals with constraint of space, stringent treated water quality parameters, theft and vandalism.

[0011] Therefore, there is a need of a prefabricated and preassembled, decentralized, portable / relocatable, compact and containerized waste water treatment system with dual treatment technology.

[0012] OBJECT OF THE INVENTION

[0013] The main object of the present invention is to provide a prefabricated, preassembled, decentralized, portable / relocatable, compact and containerized waste water treatment system and a method for waste water treatment thereof.

[0014] Another object of the present invention is to provide a waste water treatment system that is low cost, 100% integrated, containerized treatment system working on the principal of dual technology of moving bed bioreactor (MBBR) and multistage reactor (MSR).

[0015] Yet another object of the present invention is to provide a waste water treatment system to stop waste water from discharging in rivers, lakes, underground water and to treat and recycle waste water coming from housing colonies, hospitals, offices, factories.

[0016] Yet another object of the present invention is to provide a waste water treatment system to adapt to the space available and to the volume required giving a customized setup with fully automated Al control system and that treats waste water at source and gives back recycled water at source.

[0017] Still another object of the present invention is to provide a waste water treatment system to make the water bodies free of pollutants by treating waste water at source which is less in volume thereby saving the surface water from getting polluted, recharging of underground water from treated water as well as converts sludge into fertilizer in the ongoing treatment process and generating methane gas as a bi-product with attachment of bio-gas digester.

[0018] SUMMARY OF THE INVENTION

[0019] The present invention relates to a decentralized, portable / relocatable, compact and containerized waste water treatment system that is having prefabricated and preassembled components, based on dual treatment technology of moving bed bioreactor and multistage reactors and a fully automated control mechanism that treats waste water at source and gives back recycled water at source.

[0020] In an embodiment, the present invention provides a waste water treatment system comprising of a sewage water inlet; and at least one container having a plurality of treatment units. Here, said sewage water inlet transfers waste water coming from a sewage source into the at least one container having said plurality of treatment units; said plurality of treatment units include a pre-treatment unit, a primary treatment unit, a secondary treatment unit, and a tertiary treatment unit said pre-treatment unit includes a screen chamber to screen out or to remove solid particles present in the waste water in order to prevent any damage to said system by said solid particles and an oil-grease chamber to remove oil from top surface of the waste water; said primary treatment unit includes an equalization tank, an anoxic tank having an agitator, and a collection tank having a plate settler clarifier that includes a plurality of inclined plates to separate out and to collect suspended solids at bottom surface of the plate settler clarifier and clarified water exits into said secondary unit through an outlet channel at top surface of the plate settler clarifier; said secondary unit includes a plurality of reactor containers having a coarse bubble aerator attached to base of said plurality of reactor containers; said tertiary treatment unit includes a disinfectant unit, a multigrade filter and an activated carbon filter; said plurality of treatment units are prefabricated, preassembled and integrated inside the at least one container to make said system portable / relocatable, compact, and decentralized; the at least one container includes a first container enclosing the pre-treatment unit, the primary treatment unit and the plurality of reactor containers; and a second container enclosing the plurality of reactor containers and the tertiary treatment unit; and said waste water treatment system is having a volume capacity ranging from 2 kid to 2 mid.

[0021] In another embodiment, the present invention provides a method for waste water treatment by a waste water treatment system comprising the steps of (a) collecting waste water that is generated at a sewage source and routing the sewage towards a sewage water inlet followed by transferring the waste water into a pre-treatment unit to obtain a screened waste water; (b) feeding the screened waste water obtained in step (a) from said pre-treatment unit into an equalization tank and pumping into an anoxic tank followed by denitrification process to obtain an agitated sewage water and nitrogen gas; (c) moving the agitated waste water obtained in step (b) from said anoxic tank into a collection tank having a plate settler clarifier for settling down heavy substance (suspended solids) from the agitated waste water at bottom surface of said plate settler clarifier and exiting clarified waste water from said collection tank through an outlet channel at top surface of the plate settler clarifier into a secondary treatment unit having a plurality of reactor containers; (d) diffusing air into said plurality of reactor containers and cleaning waste water with the help of an aerobic and anaerobic bacteria that is grown on a plurality of moving bed bio reactor (MBBR) carrier balls to obtain a treated waste water; (e) moving the treated waste water obtained in step (d) to a disinfectant unit for disinfecting the treated waste water followed by removing suspended matter including mud, rust particles and biological growth from treated waste water by filtering the treated waste water with the help of a multigrade filter to obtain a filtered waste water; and (f) removing odor and color by passing the filtered waste water obtained in step (e) into an activated charcoal filter to obtain recycled waste water. The method recycles sewage waste water by dual technology based on moving bed bioreactor (MBBR) and multistage reactor (MSR) where said aerobic and anaerobic bacteria is grown on said plurality of moving bed bio reactor (MBBR) carrier balls for microbial degradation of pollutants in waste water.

[0022] In yet another embodiment, the present invention provides a method for obtaining said screened waste water in step (a) by removing the solid particles including cloth, plastics, wood logs or paper from the waste water by passing the waste water from said sewage water inlet into a screen chamber followed by removing oil from top surface of the waste water in an oil grease chamber by an oil and grease trap.

[0023] In yet another embodiment, the present invention provides a method for settling down suspended solids from the agitated waste water in the plate settler clarifier by the steps of: (a) moving a stream of the agitated waste water from top of a plurality of inclined plates of the plate settler clarifier; (b) flowing down said stream of agitated waste water through a feed channel underneath the plurality of inclined plates of the plate settler clarifier followed by flowing up water inside the plate settler clarifier between the plurality of inclined plates and settling suspended solids at bottom coarse surface of the plurality of inclined plates; (c) collecting the suspended solids settled bottom coarse surface of the plurality of inclined plates in step (b) through a hopper or a funnel attached at bottom of the plate settler clarifier to obtain a sludge; and (d) exiting clarified water from the plate settler clarifier through an outlet channel at top surface of the plate settler clarifier.

[0024] The present invention relates to a portable / relocatable, compact and containerized waste water treatment system that is cost-effective and provides recycled water for car washing, fire-fighting water storage tanks, gardening, agriculture, fountains, replenishing ground water, lakes or rivers and laundry. The above objects and advantages of the present invention will become apparent from the hereinafter set forth brief description of the drawings, detailed description of the invention, and claims appended herewith.

[0025] BRIEF DESCRIPTION OF THE DRAWINGS

[0026] An understanding of the waste water treatment system and the method for waste water treatment of the present invention may be obtained by reference to the following drawings:

[0027] Figure 1 is a block diagram of the waste water treatment system (100) in part (a); and a block diagram for illustrating the sequential arrangement of various components enclosed in container (2) in part (b), according to an embodiment of the present invention.

[0028] Figure 2 is a schematic view of the waste water treatment system (100), according to the present invention.

[0029] Figure 3 is a cross-sectional view of the first container (2a) of the waste water treatment system (100), according to the present invention.

[0030] Figure 4 is a pictorial representation for nozzle elevation at the first container (2a) in part (a); and different sectional views illustrating the nozzle elevation in part (b), according to the present invention.

[0031] Figure 5 is a three dimensional view of the waste water treatment system (100), according to the present invention.

[0032] Figure 6 is a pictorial representation of nozzle elevation at first container (2a), according to the present invention.

[0033] Figure 7 is a pictorial representation of nozzle plan of the first container (2a) in part (a); and for the second container (2b) in part (b), according to the present invention. Figure 8 is a pictorial representation of layout plan for the base frame of the first container (2a); and for the second container (2b) in part (b), according to the present invention.

[0034] Figure 9 is a pictorial representation of the isometric view of the first container (2a) for the waste water treatment system (100) illustrating the arrangement of anoxic tank (10), collection tank (12) having a plate settler clarifier (13) and a plurality of reactor containers (14, 15), according to the present invention.

[0035] Figure 10 is a pictorial representation of another layout plan of the first container (2a) for the waste water treatment system (100), according to the present invention.

[0036] Figure 11 is a pictorial representation of a cross-sectional view of the first container (2a) for the waste water treatment system (100), according to the present invention.

[0037] Figure 12 is a pictorial representation of the layout plan of the second container (2b) for the waste water treatment system (100), according to the present invention.

[0038] Figure 13 is a pictorial representation of a cross-sectional view of the second container (2b) for the waste water treatment system (100), according to the present invention.

[0039] Figure 14 is a pictorial representation of: inner view of an activated carbon filter (23) box of the waste water treatment system (100), according to the present invention.

[0040] Figure 15 is a tabular representation for power consumption calculation for 100 kid waste water treatment system (100), according to the present invention.

[0041] Figure 16 is a schematic representation of the method for waste water treatment with the help of the waste water treatment system (100) in parts (a) and (b), according to the present invention.

[0042] Figure 17 is a pictorial representation of the mechanism of moving bed bioreactor employed in the method for waste water treatment, according to the present invention. Figure 18 is a pictorial representation of the moving bed bioreactor media employed in the method for waste water treatment, according to the present invention.

[0043] Figure 19 is a pictorial representation of the process flow of the waste water treatment system (100) and the mechanism of moving bed bioreactor employed in the method for waste water treatment, according to the present invention.

[0044] Figure 20 is pictorial representation of working of a plate settler clarifier or lamella clarifier (13) where suspended solid falls on the smooth surface and slides down to be collected in the course bottom surface in order to trap the suspended solids in parts (a and b), according to the present invention.

[0045] Figure 21 is pictorial representation for illustrating the working of an oil-grease chamber (8) to remove oil from top surface of the waste water by oil and grease trap, according to the present invention.

[0046] DETAILED DESCRIPTION OF THE INVENTION

[0047] The present invention will now be described hereinafter with reference to the accompanying drawings in which a preferred embodiment of the invention is shown. This invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough, and will fully convey the scope of the invention to those skilled in the art.

[0048] The present invention now will be described hereinafter with reference to the detailed description, in which some, but not all embodiments of the invention are indicated. Indeed, the invention may be embodied in many different forms and shouldnot be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like numbers refer to like elements throughout. The present invention is described fully herein with non-limiting embodiments and exemplary experimentation. The present invention provides a decentralized, portable / relocatable, compact and containerized waste water treatment system that is having prefabricated and preassembled components, based on dual treatment technology of moving bed bioreactor and multistage reactors and a fully automated control mechanism that treats waste water at source and gives back recycled water at source.

[0049] In a preferred embodiment, the present invention provides a waste water treatment system (100) comprising of a sewage water inlet (1); and at least one container (2) having a plurality of treatment units. Here, said sewage water inlet (1) transfers waste water coming from a sewage source into the at least one container (2) having said plurality of treatment units; said plurality of treatment units include a pre -treatment unit (3), a primary treatment unit (4), a secondary treatment unit (5), and a tertiary treatment unit (6); said pre-treatment unit (3) includes a screen chamber (7) to screen out or to remove solid particles present in the waste water in order to prevent any damage to said system (100) by said solid particles and an oil-grease chamber (8) to remove oil from top surface of the waste water by an oil grease trap; said primary treatment unit (4) includes an equalization tank (9), an anoxic tank (10) having an agitator (11), and a collection tank (12) having a plate settler tank or a plate settler clarifier (13) that includes a plurality of inclined plates to separate and to collect suspended solids at bottom surface of the plate settler clarifier (13) and clarified water exits into said secondary unit through an outlet channel at top surface of the plate settler clarifier (13); the plurality of inclined plates of the plate settler clarifier (13) are formed of fiber reinforced plastic plates possessing a smooth surface at top portion for flowing water in downward direction and a coarse surface at bottom portion for trapping suspended solids; said secondary unit (5) includes a plurality of reactor containers (14, 15, 16, 17) having a coarse bubble aerator (18) attached to base of said plurality of reactor containers (14, 15, 16, 17); said tertiary treatment unit (6) includes a disinfectant unit (19), a multigrade filter (20) and an activated carbon filter (21); said plurality of treatment units are prefabricated, preassembled and integrated inside the at least one container (2) to make said system (100) portable / relocatable, compact, and decentralized; the at least one container (2) includes a first container (2a) enclosing the pre-treatment unit (3), the primary treatment unit (4) and the plurality of reactor containers (14, 15); and a second container (2b) enclosing the plurality of reactor containers (16, 17) and the tertiary treatment unit (6); and said waste water treatment system (100) is having a volume capacity ranging from 2 kid to 2 mid.

[0050] Further, said sewage source includes open or closed drains. Moreover, said equalization tank (9) collects the waste water received from said pre-treatment unit (3) to provide optimum conditions for subsequent treatment processes; said anoxic tank (10) degrades the nitrates in waste water received from said equalization tank (9) to nitrogen gas by denitrification in said anoxic tank (10). The agitator (11) that is secured on the roof of said anoxic tank (10) rotates at 50 rpm to keep the anoxic basin in mixing conditions. Additionally, a plurality of moving bed bio reactor (MBBR) carrier balls are introduced into said plurality of reactor containers (14, 15, 16, 17) for introduction of an aerobic and anaerobic bacteria along with a standard retention time to breakdown and to remove remaining waste and other particles by an aeration technique. The aerobic and anaerobic bacteria grown on said plurality of moving bed bio reactor (MBBR) carrier balls is having a reactivation rate of 98% in water and works in a wide temperature range of 5°C to 45°C.

[0051] The disinfectant unit (19) disinfects the waste water received from said secondary treatment unit (6); said multigrade filter (20) receives the waste water from said disinfectant unit (19) and filters fine suspended matter like mud, rust particles and biological growth that is present in the waste water. Further, the activated carbon filter (21) receives the waste water from said multigrade filter (20) and removes color, odor and organic contamination present in the waste water. The coarse bubble aerator (18) is attached to the base of said plurality of reactor containers (14, 15, 16, 17) that supplies air into said plurality of reactor containers (14, 15, 16, 17). The multigrade filter (20) is a sand filter with a plurality of layers of marble chips, sand and gravel. The activated carbon filter (21) includes a plurality of layers of activated carbon and gravel.

[0052] Further, the at least one container (2) is preferably made from corrugated sheet steel panels with a thickness ranging from 1.5 mm to 5 mm and the at least one container (2) includes a top, bottom rail and end frame that are fabricated from tubular steel. The waste water treatment system (100) of the present invention includes a plurality of pumps and motors including waste pump, agitator, monoblock filter feed pump, and screw pump. Moreover, said waste water treatment system (100) includes a filter press or a sludge drying bed (22) for management of sludge and solid waste. The waste water treatment system (100) is automatically controlled through a control panel (23). The waste water treatment system (100) exhibits an improved shelf life ranging from 18 to 20 years; consumes a low power ranging from 7 to 14 kilowatt / day.

[0053] In another preferred embodiment, the present invention provides a method for waste water treatment by a waste water treatment system (100) comprising the steps of (a) collecting waste water that is generated at a sewage source and routing the sewage towards a sewage water inlet (1) followed by transferring the waste water into a pretreatment unit (3) to obtain a screened waste water; (b) feeding the screened waste water obtained in step (a) from said pre-treatment unit (3) into an equalization tank (9) and pumping into an anoxic tank (10) followed by denitrification process to obtain an agitated sewage water and nitrogen gas; (c) moving the agitated waste water obtained in step (b) from said anoxic tank (10) into a collection tank (12) having a plate settler clarifier (13) for settling down heavy substance (suspended solids) from the agitated waste water at bottom surface of said plurality of plate settler clarifiers (13) and exiting clarified waste water from said collection tank (12) through an outlet channel at top surface of the plate settler clarifier (13) into a secondary treatment unit (5) having a plurality of reactor containers (14, 15, 16, 17); (d) diffusing air into said plurality of reactor containers (14, 15, 16, 17) and cleaning waste water with the help of an aerobic and anaerobic bacteria that is grown on a plurality of moving bed bio reactor (MBBR) carrier balls to obtain a treated waste water; (e) moving the treated waste water obtained in step (d) to a disinfectant unit (19) for disinfecting the treated waste water followed by removing suspended matter including mud, rust particles and biological growth from treated waste water by filtering the treated waste water with the help of a multigrade filter (20) to obtain a filtered waste water; and (f) removing odor and color by passing the filtered waste water obtained in step (e) into an activated charcoal filter (21) to obtain recycled waste water.

[0054] Here, said method recycles sewage waste water by dual technology based on moving bed bioreactor (MBBR) and multistage reactor (MSR) where said aerobic and anaerobic bacteria is grown on said plurality of moving bed bio reactor (MBBR) carrier balls for microbial degradation of pollutants in waste water.

[0055] Further, said anoxic tank (10) in step (b) is having an agitator (11) that is secured on the roof of said anoxic tank (10) and rotates at 50 rpm to keep the anoxic basin in mixing conditions; said suspended solids in step (c) are collected at the bottom of the plate settler clarifier (13) through a funnel or a hopper as a sludge; said aerobic and anaerobic bacteria in step (d) grown on said plurality of moving bed bio reactor (MBBR) carrier balls is having a reactivation rate of 98% in water and that works in a wide temperature range of 5°C to 45°C; said recycled waste water obtained in step (e) is having a pH ranging from 6-8; biochemical oxygen demand (BOD) in a range of 3-10 mg / L; chemical oxygen demand (COD) in a range of 30-50 mg / L; and total suspended solids (TSS) in a range of 2-10 mg / L in 2-6 hours. The equalization tank (9) in step (b) optimizes the conditions for subsequent treatment processes and said equalization tank (9) is of a sufficient size to adequately absorb waste water fluctuations that are caused by variation in production scheduling of the waste water treatment system (100) and to dampen the concentrated batches that are periodically dumped or spilled.

[0056] Said denitrification process in step (b) is achieved by converting nitrates to nitrogen gas through heterotrophic bacteria that consumes BOD, recovers lost alkalinity, and improves sludge quality. Said plurality of reactor containers (14, 15, 16, 17) diffuse air in step (c) from the coarse bubble aerator (18) that is attached to the base of said plurality of reactor containers (14, 15, 16, 17). Said plurality of moving bed bio reactor (MBBR) carrier balls in step (d) includes carrier balls made of a material with a density of 0.92-0.93 g / cm3such as high density polyethylene (HDPE). Said treated waste water in step (e) is disinfected by chlorination by chlorine dosing or ozonation by ozone. In yet another preferred embodiment, the present invention provides a method for obtaining said screened waste water in step (a) by removing the solid particles including cloth, plastics, wood logs or paper from the waste water by passing the waste water from said sewage water inlet (1) into a screen chamber (7) followed by removing oil from top surface of the waste water in an oil grease chamber (8) by an oil and grease trap.

[0057] In yet another preferred embodiment, the present invention provides a method for settling down suspended solids from the agitated waste water in the plate settler clarifier (13) by the steps of: (a) moving a stream of the agitated waste water from top of a plurality of inclined plates of the plate settler clarifier (13); (b) flowing down said stream of agitated waste water through a feed channel underneath the plurality of inclined plates of the plate settler clarifier (13) followed by flowing up water inside the plate settler clarifier (13) between the plurality of inclined plates and settling suspended solids at bottom coarse surface of the plurality of inclined plates; (c) collecting the suspended solids settled bottom coarse surface of the plurality of inclined plates in step (b) through a hopper or a funnel attached at bottom of the plate settler clarifier (13) to obtain a sludge; and (d) exiting clarified water from the plate settler clarifier (13) through an outlet channel at top surface of the plate settler clarifier (13).

[0058] Further, said sludge is converted into manure in the sludge drying bed (22) at a time span of 15-20 days.

[0059] Referring to Figure 1, a block diagram of the waste water treatment system (100) is depicted in part (a). The waste water treatment system (100), comprises of, a sewage water inlet (1) and at least one container (2) having a plurality of treatment units. The sewage water inlet (1) receives waste water from a source and transfers the waste water to said plurality of treatment units, said plurality of treatment units includes a pre-treatment unit (3), a primary treatment unit (4), a secondary treatment unit (5), and a tertiary treatment unit (6) that are prefabricated, preassembled in the at least one container (2) to make said system (100) decentralized, portable / relocatable and avoid theft and vandalism along with other eventualities that during a cleaning or servicing operation. Further, the at least one container (2) includes a first container (2a) and a second container (2b), as depicted in part (b) of Figure 1. The first container (2a) encloses the pre-treatment unit (3), the primary treatment unit (4) and the plurality of reactor containers (14, 15); and the second container (2b) encloses the plurality of reactor containers (16, 17) and the tertiary treatment unit (6). The at least one container (2) is having an outer shell made from corrugated sheet steel panels of 4 mm that are welded to the outer shell. The top and bottom side rails and end frames are 6 mm tubular steel. The roof of the at least one container (2) is made of 2 mm mild steel sheets with corrugated profiles to give the roof strength and rigidity. The side wall panels are made of 4 mm mild steel sheets with corrugated profiles for strength and rigidity. The floor consists of 4 mm chequered mild steel sheet. A set of cross members are structural components (visible from underneath the at least one container (2)) that make up the floor along with fork lift pockets. All comer posts of the at least one container (2) are made up of 4 mm high tensile steel. The at least one container (2) additionally includes a door that opens to 90 degree and an automatically operated window. All the components of the present invention are present in tanks inside the at least one container (2) and said tanks (3, 4, 5, 6, 7) are fabricated of mild steel (3-5 mm) sheets, stainless sheet (1.5 to 3 mm) with fiber- reinforced plastic (1.5 to 2 mm) coating and lining in order to increase the life to a time-period of 25-25 years. Further, the at least one container (2) includes a lamella settler that is made of fiber reinforced plastic sheets (3 mm) or high-density polyethylene.

[0060] Referring to Figure 2, a schematic view of the waste water treatment system (100) is depicted. The pre-treatment unit (3) includes a screen chamber (7) and an oil grease chamber (8). The screen chamber (7) helps in avoiding any damage to said system (100) by removing solid particles that are present in the waste water. The oil grease chamber (8) removes oil from top surface of waste water.

[0061] The primary treatment unit (4) includes an equalization tank (9), an anoxic tank (10) having an agitator (11), and a collection tank (12); and the collection tank (12) is having a plate settler clarifier (13) that include plurality of inclined plates. The equalization tank (9) collects the waste water from said pre-treatment unit (3) and provides optimum conditions for subsequent treatment processes.

[0062] The secondary treatment unit (5) includes a moving bed bio reactor that is integrated with a multi stage reactor for introduction of an aerobic and anaerobic bacteria along with a standard retention time to breakdown and to remove remaining waste and other particles by an aeration technique from the water received from said primary treatment unit (4). The tertiary treatment unit (6) includes a disinfectant unit (19), a multigrade filter (20) and an activated carbon filter (21).

[0063] Referring to Figure 16, a flow chart of a method for waste water treatment with the help of the waste water treatment system (100), is depicted. The waste water treatment system (100) works in five stages, i.e., a pre-treatment stage, a primary treatment stage, a secondary treatment stage, a tertiary treatment stage and a post treatment stage. The pre-treatment stage involves collection of waste water from various sources like sewage and the sewage water or waste water is allowed to flow by gravity through open or close drains passing through a coarse screen. The waste water is passed through a screen chamber (7) and screening is an essential step in treatment for removal of solid particles that otherwise damage the components of the system (100). The processed water from the screen chamber (7) flows into an oil and grease chamber (8), wherein the free floating oil is removed from the top surface of the water, as the presence of oil and grease in the water have detrimental effect on the performance of the system (100). In the oil grease chamber (8), an oil and grease trap collects and reduces the amount of fats, oils and greases from the wastewater and prevents drain blockages, foul odors and any kind of pest infestation, as depicted in Figure 21. The primary treatment stage involves collection of oil free water received from the oil grease chamber (8) into an equalization tank (9) to provide optimum conditions for subsequent treatment processes. The dimension of the equalization tank (9) depends upon the overall size of the at least one container (2) to adequately absorb wastewater fluctuations caused by variation in the system (100) scheduling and to dampen the concentrated batches periodically dumped or spilled. The water from the equalization tank (9) is forwarded to an anoxic tank (10), wherein microorganisms are exposed to nitrates and recycled from a bio-reactor. In the absence of dissolved oxygen, bacteria degrades the nitrates to nitrogen gas in a process known as de-nitrification. The anoxic basin not only serve to convert nitrates to nitrogen gas, but also consume biochemical oxygen demand, recover some lost alkalinity, and improve sludge quality. In the anoxic basin, de-nitrification occurs whereby heterotrophic bacteria convert nitrates to nitrogen gas as part of cellular respiration. The carbon substrate (BOD) is consumed to synthesize cell mass and nitrate is employed as an energy source. The consumption of biochemical oxygen demand reduces aeration requirements, thereby improving the overall energy performance of the system (100). The anoxic basin is provided with an agitator (11) to keep the anoxic basin in mixing conditions. The agitator rotates at 50 rpm. The secondary treatment stage involves introduction of both aerobic and anaerobic bacteria, along with standard retention time to breakdown and to remove the remaining waste and other small particles by aeration. The clarified water from the plate settler clarifier (13) is forwarded to the moving bed bio-reactor with a plurality of reactor containers (14, 15, 16, 17) from the top and the water comes in contact to the microorganisms attached to the bio pac media. The secondary phase of the treatment process utilizes the principal of microbial degradation of pollutants in the presence of oxygen. The moving bed bio-reactor is an attached growth aeration process that employs a neutrally buoyant plastic media to optimize biomass growth and protection within a bed, as shown in Figure 17. The moving bed bio-reactor process employs a submerged bio pac media onto which microorganisms attach. The bio pac media is having a high surface to volume ratio for a high concentration of biological growth to thrive within the protected areas of the media. As the media supports a biomass concentration several times that is achievable in activated sludge systems, hence, the treatment is significantly more productive. The biomass retained on the media provides effective treatment for the water. The bio pac media are kept in motion by the coarse bubble aerators (18). Apart from oxygenation, the air introduced into the reactor containers (14, 15, 16, 17) is sufficient to ensure thorough mixing and turnover of the media within the reactor. The air from the aerator periodically strips of most of the accumulated biomass to control the thickness and age distribution of the bio film, and to prevent the development of anaerobic conditions. The frequency of air shearing is optimized so that the microbes remain in a high growth phase and to form a fully developed food chain where larger organisms consume smaller ones. The whole process is distributed in multi stage reactor that enhances the bio treatment and intensifies the desired result to two folds that results into more biochemical oxygen demand conversion to water and carbon dioxide (CO2) and less to biomass, and hence the sludge production is minimized. The need to periodically remove waste sludge and the requirement to supply a dilute return activated sludge to maintain an appropriate food to microorganisms (F / M) ratio is eliminated. Once acclimated the bio film is highly resistant to shock caused by abrupt changes in biochemical oxygen demand loading or exposure to toxins. The media (MBBR carrier balls) in the moving bed bio-reactor is preferably made up of high- density polyethylene with surface area ranging from 400 to 450 m2 / m3, voidage ranging from 95 to 98% and density ranging from 0.92 to 0.93 g / cm3, as shown in Figure 18. The bacteria is grown on a plurality of the bio pac media and is a highly concentrated product with a reactivation rate of 98% in water and works in a wide temperature range from 5°C to 45°C. The tertiary treatment involves an advance treatment process through a disinfectant unit (19), a multigrade filter (20), and an activated carbon filter (21). A biologically treated water is received from the moving bed bio-reactor that is integrated with multi stage reactor in the secondary treatment unit (5) and passed through the tertiary treatment unit (6). The waste water is passed to the disinfection unit (19) for chlorination followed by filtration through the multigrade filter (20) and the activated carbon filter (21). The multigrade filter (20) is ideal for filtration of water having fine suspended matter like mud, rust particles and biological growth. The multigrade filter (20) is a pressure vessel constructed of welded mild steel and provided with a manhole with a cover / top and bottom flanged covers, supports, raw water distributor, under drain collection and backwash water jet system or for smaller volumes, fiber reinforced plastic (FRP) vessel with multiport valve for different actions. Further, the biological treated water flows downwards through the filter bed, and the turbidity and suspended matter is retained on the quartz surface. Filtered water is evenly collected by an under drain system in the bottom of a vessel and flows through the outlet to service. At normal flow-rates, a clean filter bed presents resistance to the passage of water but the suspended matter is removed from the water, steady rise in the loss of head occurs across the quartz bed. Cleaning of the filter bed is effected by passing a reverse upward flow of water through the filter for approximately 3 to 5 minutes. After the removal of suspended matter and turbidity in pressure quartz filter, the water is passed through the activated carbon guard filter (21) for removal of color, odor and organic contamination in the water. The activated carbon guard filter (21) is supplied as pressure vessel constructed of welded mild steel and provided with flanged covered four-legs that supports raw water distributor, underdrain collection and backwash waterjet system or for smaller volumes. After removal of suspended matter, the left out water flows downwards through the beds of activated carbon guard filter (21). The color, odor and organic contamination in the water is trapped by adsorption on the surface of activated carbon granules that produces a filtered water that is evenly collected by an under drain system in the bottom of the vessel and flows through the outlet to service. The backwash is carried out by passing a reverse upward flow of water through the filter for approximately 3 to 5 minutes.

[0064] The post treatment stage is the last stage and is optional wherein the water received from the tertiary treatment unit is further filtered through ultra-filtration and reverse osmosis units to obtain a highly purified water.

[0065] EXAMPLE 1 Experimentation Details

[0066] Waste water treatment system

[0067] There are different types of sewerage treatment plant (STP): Effluent treatment plant (ETP), water treatment plant (WTP) and combined effluent treatment plant (CETP). Here, the sewage and effluent are treated in a single treatment plant through combined effluent treatment plant (CETP), by combining STP and ETP. The two assets that are derived from the waste water treatment system (100) are fertilizer manure obtained from sludge generation and the recycled waste water. The obtained assets are marketable to recover the cost as well to produce energy by biogas generation. 100 kid waste water treatment system

[0068] A 100 kid, containerized, portable / relocatable waste water treatment system, manufactured, installed, commissioned and tested in a record time of 31 days. The technology employed to treat the waste water and sludge coming from the toilets, bathing area and langer is MBBR (Moving Bed Bio Reactor) with MSR (Multi Stage Reactors), the quality of water was tested by the Department of Water Supply and Sanitation, Punjab and was in accordance as per the NGT norms and specifications. The two containers of size of 640 square feet (Size=40’X8’X8’ (each) 320 square feet, total 2 containers). Figure 7 is a pictorial representation of the layout plan of the first container (2a) in part (a), and for the second container (2b) in part (b) for 100 kid waste water treatment system (100). Figure 8 is a pictorial representation of the layout plan for the base frame of the first container (2a) in part (a) and for the second container (2b) in part (b) for 100 kid waste water treatment system (100). Figure 9 is a pictorial representation of the isometric view of the first container (2a) for 100 kid waste water treatment system (100) illustrating the arrangement of anoxic tank (10), collection tank (12) having plate settler clarifiers (13) and reactor containers. Figure 10 is a pictorial representation of another layout plan of the first container (2a) for 100 kid waste water treatment system (100). Figure 11 is a pictorial representation of a cross-sectional view of the first container (2a) for 100 kid waste water treatment system (100). Figure 12 is a pictorial representation of the layout plan of the second container (2b) for 100 kid waste water treatment system (100). Figure 13 is a pictorial representation of a cross-sectional view of the second container (2b) for 100 kid waste water treatment system (100). The waste water treatment system is having a capacity of 100 kid, a time-cycle of 100 kl in 24 hours and range of capacity=l kid to 2 mid. The processes involved are recirculation, aerobic, anaerobic and anoxic. As the system and all the equipment is installed inside the container and are welded to the container, aspect of theft and vandalism is none. The system is customized keeping in mind the particular need such as land, waste water quality, aesthetics. The system is compact as the tanks, machines, electrical parts are integrated and designed to fit inside the container. The non-corrosive and recyclable materials are employed in the fabrication that made the waste water treatment system cost effective and durable in transport. Further, the system is robust and durable lasting up to 15 to 20 years with zero waste unit, low odor, low noise, a low electricity consumption that is also run by solar power and automatically adaptable during low and high flow rates with a recovery rate of 90-95%.

[0069] Portable / relocatable waste water treatment system: Decentralized waste water recovery and reuse solution

[0070] As the components are integrated inside the container, the system is moved at any point of time and hence is not fixed at a specific point. Thus, reduces the carbon foot as compared to the existing designs. The waste water treatment system is portable / relocatable (onsite) as the waste water is taken from source, treated at source and recovered or give back to the source.

[0071] The treatment unit being integrated inside a container the whole structure becomes robust and sturdy, durable for any kind of wear and tear. Further, the system is fully automated, having limited human intervention, hence decreased chances of errors and capable of running on solar power also. The volume / capacity is flexible to be increased at any point of time, as and when required. The compact, portable / relocatable and containerized waste water treatment plant solved the problem aroused due to the growing urbanization the lack of space by having capacity ranging from 2 kid to 2 mid.

[0072] Components of the waste water treatment system (100)

[0073] The outer shell of the waste water treatment system (100) is a robust container (2). The walls of the container (2) are made from 14 gauge, 0.075 inch corrugated sheet steel panels (4mm) that are welded to the main structure. The top, bottom side rails and end frames are formed of 7 gauge tubular steel (6 mm). The steel that is employed for making container is a corrosive resistant high-strength low-alloy steel from which modern shipping / cargo containers are built. The container is fabricated for a long life in the outdoors. The comers are of the container are framed in a manner to bear all loads that allows container to be very strong and having the ability to be stacked up to sometimes nine containers high. The roof of the container is made of corten steel sheets (2 mm mild steel sheets) with corrugated profiles to give the roof strength and rigidity. Further, the side wall panels are made of corten steel sheets (4 mm mild steel sheets) with corrugated profiles for strength and rigidity. The floor of the container consists of laminated marine plywood of 28 mm (or 4 mm chequered mild steel sheet). The cross members are structural components (visible from underneath the container) that make up the floor along with fork lift pockets. The rails form the frame of the container. The top rails are either box section profiles or flat bar profiles of 10 mm. The door end and front end bottom rails have “Cuts Outs” that helps to stop the rail from being pierced from the twist lock points when being loaded onto a trailer. The comer posts are having the front end and the door end and all comer posts are made up of 10 mm high tensile steel. A strict repair criteria is enforced on repairs that conform to IICT5 repair criteria. Moreover, the container further consists of doors, fittings and CSC plate. The doors opens to 90 degree. The windows are power coated AT windows. The holding tanks: are fabricated from sheets of MS of thickness of 3-5 mm, SS of thickness of 1.5 to 3 mm with fiber reinforced plastic (FRP) (1.5 to 2 mm) coating and lining (varying in size as per volume requirement). Further, FRP sheets of 3 mm or high-density polyethylene (HDPE) are employed as lamella settler and the size is taken according to design / volume. A HDPE (black and virgin white) having surface area of 450 sqm / cum, voidage>98% and density of 0.92- 0.93 is taken as a MBBR media. For disinfection either ozonation (ozone is infused into water) or chlorination (augmentation of Chlorine) is employed. The multigrade filter is a sand filter with a plurality of layers of sand and gravel. The activated carbon filter includes a plurality of layers of activated carbon and gravel. For the multigrade sand filter, a FRP vessel with layers of sand and gravel is taken and volume is set as per design. For the activated carbon filter, a FRP vessel with layers of activated carbon and gravel is taken and volume is set as per design. Various pumps and motors such as sewage pump, agitator, monoblock filter feed pump, screw pump, (capacity as per design) were taken. For aeration and recirculation (capacity as per design) blower and motor was taken. For the management of sludge and solid waste management, filter press or sludge drying bed (capacity as per design) were employed. An electromagnetic flow meter was taken for flow measurement. A smart, automated Programmable Logic Controller (PLC) based system was taken as a control panel. The idea is to provide a system that is prefabricated and preassembled, decentralized, portable / relocatable, fully integrated and compact, robust sewage treatment system with the ability to be customized according to the availability of space and avoiding theft and mishappening or eventualities during cleaning or servicing operations. Here, the components like tanks, all mechanical and electromechanical, plumbing’s and control panel (with SCADA system - optional) are housed inside the prefabricated and preassembled unit. The advantage the fabricated system is that as the whole system with all components are placed inside the container in such a way that acts as a single and compact unit which as desired or when required is also portable / relocatable to any other site at any given time and made operational in a very short period of time. Further, depending upon the volume capacity of the waste water treatment system, the at least one container (2) of varying size is also employed as depicted in Table 1.

[0074] Table 1: Size of container (2) according to the volume capacity of the waste water treatment system

[0075] Dual treatment technology

[0076] Moving bed biofilm reactors (MBBR) with multi stage reactors (MSR) is a advancement over the conventional MBBR that incorporates unique structural design and modem methods to improve the MBBR technology. The present invention provides a waste water treatment technology that employs aerobic and anoxic processes to achieve high level of removal of carbon, nitrogen and phosphorous in single treatment unit. The aerobic and anoxic processes reduces the hydraulic retention time (HRT) of wastewater in the system, and at the same time, generates a high quality of treated water ready for non-potable reuse, also reduces the footprint requirement of the MBBR by incorporating multi reactor design with different HRT.

[0077] Moving Bed Biofilm Reactor (MBBR) based technology

[0078] The MBBR system consists of an aeration tank with special plastic carriers that provide a surface where a biofilm grows. The carriers are made of a material with a density (0.93 g / cm3) close to the density of water (1 g / cm3), such as HDPE. The carriers are mixed in the tank by the aeration system and thus have good contact between the substrate in the influent wastewater and the biomass on the carriers.

[0079] EXAMPLE 2

[0080] Method for waste water treatment

[0081] The method for waste water treatment of the present invention is broken down to five different stages: pre-treatment stage, primary treatment stage, secondary treatment stage and tertiary treatment stage.

[0082] Pre-treatment stage

[0083] Transport of sewage

[0084] The waste water (sewage) that is generated from various sources is collected at source and routed towards the waste water treatment system (100) with the help of inlet means (1). All the sewage is allowed to flow by gravity through open / close drains passing through coarse screen respectively.

[0085] Screen chamber (7) Screening is an essential step in waste water treatment for removal of material that would otherwise damage equipment’s; interfere with satisfactory operation of the treatment units or equipment.

[0086] Oil grease chamber (8)

[0087] The screened waste water flows into oil grease chamber (8) where the free-floating oil is removed from the top surface of liquid (screened waste water) with the help of oil trap. The presence of oil and grease in waste water entering any treatment system have a detrimental effect on the performance of the treatment system. Therefore, the oil grease chamber in the pre-treatment unit prevents the entry of any oil or grease. In the oil grease chamber (8), an oil and grease trap collects and reduces the amount of fats, oils and greases from the wastewater and prevents drain blockages, foul odors and any kind of pest infestation, as depicted in Figure 21.

[0088] Primary treatment stage

[0089] Equalization tank (9)

[0090] The screened waste water received after pre-treatment stage is collected into an equalization tank (9). The objective of the equalization tank is to feed in (that is to collect) sewage flow and characteristics in order to provide optimum conditions for subsequent treatment processes. The equalization tank is of a sufficient size to adequately absorb waste water fluctuations caused by variation in production scheduling of the treatment system and to dampen the concentrated batches periodically dumped or spilled.

[0091] Anoxic tank (10)

[0092] The screened waste water from equalization tank (9) is received in an anoxic tank (10). The anoxic stage of the process exposes microorganisms to nitrates that are generated in and recycled from the MBBR. In the absence of dissolved oxygen, bacteria degrades the nitrates into nitrogen gas in a process known as de-nitrification. The anoxic basin serves to convert nitrates to nitrogen gas and also consumes BOD, recovers some lost alkalinity, and improves sludge quality. In the anoxic basin, the denitrification occurs whereby heterotrophic bacteria convert nitrates (NO3) to nitrogen gas (N2) as part of cellular respiration. In short, carbon substrate (BOD) is consumed to synthesize cell mass and nitrate is taken as an energy source. The consumption of BOD is having the side benefit of reducing aeration requirements, thereby improving the overall energy performance of the system. As part of the denitrification process, some alkalinity is recovered and the pH of the system is partially stabilized. The anoxic basin is provided with an agitator (11) to keep the basin in mixing conditions. Here, the heavy metals are treated in water by coagulation and flocculation after physical separation of big sized impurities like cloth, plastics, wood logs, paper etc. in the pre-treatment stage. The agitator rotates at 50 rpm and is deprived of oxygen.

[0093] Lamella settler or plate settler clarifier (13)

[0094] Typical lamella settler or clarifier consists of a series of inclined fiber reinforced plastic (FRP) plates inside a vessel, as depicted in part (a) of Figure 20. The untreated feed water stream enters from the top of the vessel and flows down a feed channel underneath the inclined plates. Thereafter, water flows up inside the lamella clarifier between the inclined plates and the solids settle onto the plates and eventually fall to the bottom of the vessel. The route (or pathway) a particle takes is dependent upon the flow rate of the suspension and the settling rate of the particle, as depicted in part (b) of Figure 20. At the bottom of the vessel, a hopper or funnel collects the particles as sludge. The sludge is either continuously or intermittently discharged. Above the inclined plates, all particles have settled and the clarified water is produced that is drawn off into an outlet channel. The clarified water exits the plate settler tank in an outlet stream. The FRP plates have smooth surface (facing on the top) on one side and coarse surface (facing downwards) on the other to trap the suspended solids where the suspended solid falls on the smooth side and slides down to be collected at the bottom of the incline plates.

[0095] The main advantage of lamella clarifiers over the conventional clarifying system is the large effective settling area achieved due to inclined plates that improves the operating conditions of the clarifiers in a number of ways. The unit is more compact that requires only 65-80 % of the area of clarifiers operating without inclined plates. Therefore, where site footprint constraints are of concern a lamella clarifier system is preferred. The reduced required area allows the possibility for the clarifiers to be located and operated inside, reducing some of the common problems of algae growth, clogging due to blowing debris accumulation and odour control, that occur when the machinery is outdoors. Operation within an enclosed space also allows for a better control of operating temperature and pressure conditions. The inclined plates allow the clarifier to operate with overflow rates 2 to 4 times that of traditional or conventional clarifiers resulting into a greater influent flow rate and thus a more time efficient clarification process. Tamella clarifiers also offer a simple design without requiring any chemicals. Therefore, the lamella clarifiers are able to act as pre-treatment for delicate membrane processes where necessary flocculants are added to promote efficiency.

[0096] Tamella clarifier performance is also improved by the addition of flocculants and coagulants. The flocculants and coagulants optimize the settling process and cause a higher purity of overflow water by ensuring that all smaller solids are settled into the sludge underflow. A further advantage of the lamella clarifier is the absence of distinct mechanical and moving part. The system therefore requires no energy input except for the influent pump and has a much lower propensity for mechanical failure than other clarifiers. The advantage extends to safety considerations when operating the plant. The absence of mechanical results in a safer working environment, with less possibility for injury. Whereas the commercially available lamella clarifiers require different concrete basin geometry or a structural support to the conventional clarifications system that are widely employed in industry thus increasing the cost of installing a new (lamellar) clarification system.

[0097] Secondary treatment stage

[0098] The secondary waste water treatment stage employs both aerobic and anaerobic bacteria, along with standard retention time to breakdown and to remove the remaining waste and other small particles by aeration. The bacteria taken in the system is a highly concentrated product with a reactivation rate of 98% in water that works in a wide temperature range from 5-45°C.

[0099] How moving bed bio-reactor (MBBR) works

[0100] The MBBR process employs floating plastic carriers (media) within the aeration tank to increase the amount of added bacteria or microorganisms available to treat the wastewater. The microorganisms consume organic material. The media provides increased surface area for the biological bacteria or microorganisms to attach to and grow in the aeration tanks. The increased surface area reduces the footprint of the tanks required to treat the wastewater. The media is continuously agitated by bubbles from the aeration system that adds oxygen at the bottom of the first compartment of the aeration tank. The microorganisms consume organic material. When compared to conventional secondary treatment, the present invention provides superior efficiency and value. The effective surface area of carrier element (Bio-media type K3) is 500m2 / m3. The carrier element employed in the present invention exhibits following characteristic features: minimum order quantity (1 cubic meter); media diameter (22 mm); density (0.93 gm / cc); maximum continuous operation pressure (80°C); specific gravity (0.90-0.95 gm / cm2); color (black); PSA / TSA ratio (75%); moc (virgin PP UV stabilized); effective surface area (400 m2 / m3); media fill rate range (25-55% fill of V); type of media (floating MBBR media); structure (cylindrical with external fins); media height (15 mm); an d specific weight (0.37).

[0101] Moving bed bio-reactor (MBBR) with multi stage reactor (MSR)

[0102] The waste water enters from the top portion of the reactor containers (14, 15, 16, 17) and comes in contact to the microorganisms attached to the Bio Pac Media. The secondary phase of the treatment process utilizes the principal of microbial degradation of pollutants in the presence of oxygen. The MBBR system is an attached growth aeration process that uses a neutrally buoyant plastic media to optimize biomass growth and protection within a bed. The MBBR process employs a submerged Bio Pac Media onto which microorganisms attach. The Bio Pac Media has a very high surface to volume ratio, allowing for a high concentration of biological growth to thrive within the protected areas of the media. As the media supports a biomass concentration several times that achievable in activated sludge systems, treatment is significantly more productive. The biomass retained on the ring media provides effective treatment for the wastewater. The Bio Pac media are kept in motion by a coarse bubble aerator (18) that is attached on the base of reactor containers (14, 15, 16, 17). Apart from oxygenation, air introduced into the reactor (14. 15, 16, 17) is sufficient to ensure thorough mixing and turnover of the media within the reactor containers (14, 15, 16, 17). The air from the coarse bubble aerator (18) periodically strips of most of the accumulated biomass to control the bio film thickness and age distribution, and to prevent the development of anaerobic conditions. The frequency of air shearing is optimized so that the microbes remain in a high growth phase and also forms a fully developed food chain, in which larger organisms consume smaller ones. The whole process is distributed in MSR to enhance the bio treatment and to intensify the desired result to two folds that results into more BOD conversion to water and CO2and less biomass production so as to minimize the sludge production. Further, the need to periodically supply waste sludge and the requirement to supply a dilute return activated sludge to maintain an appropriate food to microorganisms (F / M) ratio is eliminated. Once acclimated, the bio film is highly resistant to shock caused by abrupt changes in BOD loading or exposure to toxins.

[0103] Tertiary treatment stage

[0104] The tertiary treatment stage is an advance treatment process, following secondary treatment of waste water that produces high-quality water. The tertiary treatment unit includes multigrade filter (MGF), activated carbon filter (ACF) and disinfectant unit (19). The chlorination or chlorine dosing or ozonisation is done for disinfecting the treated water in the disinfectant unit (19). Biologically treated water after secondary treatment stage is pumped to the disinfectant unit (19) followed by pumping the chlorinated water to the multigrade filter (20). The chlorine in the disinfectant unit stays in the treated water for 48 hours for chlorination. Whereas in ozonisation process, the ozone stays in the treated water for 12-24 hours. Although, the ozonisation is more effective than chlorination however, the process of ozonisation is expensive. The multigrade filter (20) is ideal for filtration of water having very fine suspended matter like mud, rust particles and biological growth. The multigrade filter (20) is a pressure vessel constructed of welded mild steel / FRP and provided with manhole with cover / top and bottom flanged covers, supports, raw water distributor, under drain collection and backwash water jet system. Biological treated water flows downwards through the filter bed, and the turbidity and suspended matter is retained on the quartz surface. Filtered water is evenly collected by an under drain system in the bottom of the vessel and flows through the outlet to service. At normal flow-rates, a clean filter bed presents little resistance to the passage of water but the suspended matter is removed from the water, steady rise in the loss of head occurs across the quartz bed. Cleaning of filter bed is effected by passing a reverse upward flow of water through the filter for approximately 3 to 5 minutes. After the removal of suspended matter and turbidity in pressure quartz filter, the water is passed through activated carbon guard filter (21) for removal of color, odor and organic contamination in the water. The activated carbon filter (21) is supplied as pressure vessel constructed of welded mild steel and provided with flanged covers four leg supports raw water distributor, under drain collection and backwash water jet system. Water after removal of suspended matter flows downwards through the beds of activated carbon guard filter. The color, odor and organic contamination in the water is trapped by adsorption on the surface of activated carbon granules. Filtered water is evenly collected by an under drain system in the bottom of the vessel and flows through the outlet to service. The backwash is carried out by passing a reverse upward flow of water through the filter for approximately 3 to 5 minutes.

[0105] EXAMPLE 3 Environmental impact

[0106] Fertilizer from treated sludge: Sludge to manure

[0107] A sewage sludge is insoluble residue produced in the waste water treatment processes and following stabilization process such as aerobic and anaerobic digestion and shows high content of nutrients like nitrogen and phosphorus. Usually aerobic digestion is more profitable in small waste water treatment systems, while anaerobic one is employed in big treatment system. The characteristics of sewage sludge depends on the nature of the treated sewage and treatment technology. Digested sludge after the process in aerobic conditions shows a high content of nutrients (primarily nitrogen and phosphorus) that acts as a potential fertilizer source and soil conditioner. Table 2 shows details of manure obtained from sludge.

[0108] Table 2: Manure obtained from sludge

[0109] Reuse and replenishment

[0110] The treated water obtained by the sewage treatment system of the present invention is employed for car washing, fire-fighting water storage tanks, gardening, agriculture, fountains, replenishing ground water, lakes or rivers and laundry purpose. Further, the present invention provides the several benefits as compared to the existing conventional systems. Table 3 shows the comparison of solutions provided by the present invention and conventional systems. Further, Tables 4-6 shows the comparison of different technologies employed in waste water treatment with respect to the dual technology treatment of the present invention. Further, the result analysis for the various sample of the recycled water obtained with the help of the system (100) and method for waste water treatment of the present invention are listed in Tables 7-14. The treated sewage water meets the following standards: pH (6.5-8.5); BOD on fifth day (<10 mg / F); COD (<50 mg / L); TSS (<10 mg / L); ammoniac nitrogen (<5 mg / L); total nitrogen (<5 mg / L); and faecal coliform (<100 MPN / 100 mL).

[0111] Table 3: Comparison of solutions provided by the present invention and conventional systems

[0112] Table 4: Comparison of pros and cons of MBR technology with respect to the dual technology treatment of the present invention

[0113] Table 5: Comparison of pros and cons of Trickling filter technology with respect to the dual technology treatment of the present invention

[0114] Table 6: Comparison of pros and cons of Phytorid technology with respect to the dual technology treatment of the present invention

[0115] Table 7: Result analysis for quality of water after treatment (Noida testing laboratory)

[0116] Table 8: Result analysis for quality of water after treatment (Department of water supply and sanitation (Punjab biotechnology incubator)) Table 9: Result analysis for quality of water after treatment (Quality lab,

[0117] Gurugram)

[0118] Table 10: Result analysis for quality of inlet water that is before treatment (Environ Tech Laboratories)

[0119] Table 11: Result analysis for quality of outlet water that is after treatment (Environ Tech Laboratories)

[0120] Table 12: Result analysis for quality of outlet water that is after treatment (Environ Tech Laboratories) Table 13: Result analysis for quality of inlet water that is before treatment (Environ Tech Laboratories)

[0121] Table 14: Comparative analysis for characteristics of water quality of inlet water (ultimate average daily flow) and treated sewage water (final effluent)

[0122] Therefore, the present invention provides a prefabricated, preassembled, decentralized, portable / relocatable, compact and containerized waste water treatment system that is low cost, 100% integrated treatment system working on the principal of dual technology of moving bed bioreactor (MBBR) and multistage reactor (MSR).

[0123] Many modifications and other embodiments of the invention set forth herein will readily occur to one skilled in the art to which the invention pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

CLAIMSWe claim:

1. A waste water treatment system ( 100) comprising of: a sewage water inlet (1); and at least one container (2) having a plurality of treatment units; wherein, said sewage water inlet (1) transfers waste water coming from a sewage source into the at least one container (2) having said plurality of treatment units; said plurality of treatment units include a pre-treatment unit (3), a primary treatment unit (4), a secondary treatment unit (5), and a tertiary treatment unit (6); said pre-treatment unit (3) includes a screen chamber (7) to screen out or to remove solid particles in the waste water in order to prevent any damage to said system (100) by said solid particles, and an oil-grease chamber (8) to remove oil from top surface of the waste water by an oil grease trap; said primary treatment unit (4) includes an equalization tank (9), an anoxic tank (10) having an agitator (11), and a collection tank (12) having a plate settler tank or a plate settler clarifier (13) that includes a plurality of inclined plates to separate and to collect suspended solids at bottom surface of the plate settler clarifier (13) and clarified water exits into said secondary unit through an outlet channel at top surface of the plate settler clarifier (13); said secondary treatment unit (5) includes a plurality of reactor containers (14, 15, 16, 17) having a fine bubble aerator or diffuser (18) attached to base of said plurality of reactor containers (14, 15, 16, 17); said tertiary treatment unit (6) includes a disinfectant unit (19), a multigrade filter (20) and an activated carbon filter (21); said plurality of treatment units are prefabricated, preassembled and integrated inside the at least one container (2) to make said system (100) portable, compact, and decentralized; andsaid waste water treatment system (100) is having a volume capacity ranging from 2 kid to 2 mid.

2. The waste water treatment system (100) as claimed in claim 1, wherein said sewage source includes open or closed drains.

3. The waste water treatment system (100) as claimed in claim 1, wherein said equalization tank (9) collects the waste water received from said pre-treatment unit (3) and provides optimum conditions for subsequent treatment processes.

4. The waste water treatment system (100) as claimed in claim 1, wherein said plurality of inclined plates of the plate settler clarifier (13) are formed of fiber reinforced plastic plates possessing a smooth surface at top portion for flowing water in downward direction and a coarse surface at bottom portion for trapping suspended solids.

5. The waste water treatment system (100) as claimed in claim 1, wherein nitrates in waste water received from said equalization tank (9) are degraded to nitrogen gas by denitrification in said anoxic tank (10).

6. The waste water treatment system (100) as claimed in claim 1, wherein a plurality of moving bed bio reactor (MBBR) carrier balls are introduced into said plurality of reactor containers (14, 15, 16, 17) for introduction of an aerobic and anaerobic bacteria along with a standard retention time to breakdown and to remove remaining waste and other particles by an aeration technique.

7. The waste water treatment system (100) as claimed in claim 1, wherein said disinfectant unit (19) disinfects the waste water received from said secondary treatment unit (6).

8. The waste water treatment system (100) as claimed in claim 1, wherein said multigrade filter (20) receives the waste water from said disinfectant unit (19)and filters fine suspended matter like mud, rust particles and biological growth that is present in the waste water.

9. The waste water treatment system (100) as claimed in claim 1, wherein said activated carbon filter (21) receives the waste water from said multigrade filter (20) and removes color, odor and organic contamination present in the waste water.

10. The waste water treatment system (100) as claimed in claim 1, wherein said coarse bubble aerator (18) is attached to the base of said plurality of reactor containers (14, 15, 16, 17) that supplies air into said plurality of reactor containers (14, 15, 16, 17).

11. The waste water treatment system (100) as claimed in claim 1, wherein said multigrade filter (20) is a sand filter with a plurality of layers of marble chips, sand and gravel.

12. The waste water treatment system (100) as claimed in claim 1, wherein said activated carbon filter (21) includes a plurality of layers of activated carbon and gravel.

13. The waste water treatment system (100) as claimed in claim 1, wherein the at least one container (2) is preferably made from corrugated sheet steel panels with a thickness ranging from 1.5 mm to 5 mm and the at least one container (2) includes a top, bottom rail and end frame that are fabricated from tubular steel.

14. The waste water treatment system (100) as claimed in claim 1 , wherein the at least one container (2) includes two containers with a first container (2a) enclosing the pre-treatment unit (3), the primary treatment unit (4) and the plurality of reactor containers (14, 15,) and a second container (2b) enclosing the plurality of reactor containers (16, 17) and the tertiary treatment unit (6).

15. The waste water treatment system (100) as claimed in claim 1, wherein said waste water treatment system (100) includes a plurality of pumps and motors including waste pump, agitator, mono-block filter feed pump, and screw pump.

16. The waste water treatment system (100) as claimed in claim 1, wherein said waste water treatment system (100) includes a filter press or a sludge drying bed (22) for management of sludge and solid waste.

17. The waste water treatment system (100) as claimed in claim 1, wherein said waste water treatment system (100) is automatically controlled through a control panel (23).

18. The waste water treatment system (100) as claimed in claim 1, wherein said waste water treatment system (100) exhibits an improved shelf life ranging from 18 to 20 years.

19. The waste water treatment system (100) as claimed in claim 1, wherein said waste water treatment system (100) consumes a low power ranging from 7 to 14 kilowatt / day.

20. A method for waste water treatment by a waste water treatment system (100) comprising the steps of:(a) collecting waste water that is generated at a sewage source and routing the sewage towards a sewage water inlet (1) followed by transferring the waste water into a pre-treatment unit (3) to obtain a screened waste water;(b) feeding the screened waste water obtained in step (a) from said pretreatment unit (3) into an equalization tank (9) and pumping into an anoxic tank (10) followed by denitrification process to obtain an agitated sewage water and nitrogen gas;(c) moving the agitated waste water obtained in step (b) from said anoxic tank (10) into a collection tank (12) having a plate settler clarifier (13) for settling down heavy substance (suspended solids) from the agitated wastewater at bottom surface of said plate settler clarifier (13) and exiting clarified waste water from said collection tank (12) through an outlet channel at top surface of the plate settler clarifier (13) into a secondary treatment unit (5) having a plurality of reactor containers (14, 15, 16, 17);(d) diffusing air into said plurality of reactor containers (14, 15, 16, 17) and cleaning waste water with the help of an aerobic and anaerobic bacteria that is grown on a plurality of moving bed bio reactor (MBBR) carrier balls to obtain a treated waste water;(e) moving the treated waste water obtained in step (d) to a disinfectant unit (19) for disinfecting the treated waste water followed by removing suspended matter including mud, rust particles and biological growth from treated waste water by filtering the treated waste water with the help of a multigrade filter (20) to obtain a filtered waste water; and(f) removing odor and color by passing the filtered waste water obtained in step (e) into an activated charcoal filter (21) to obtain recycled waste water; wherein, said method recycles sewage waste water by dual technology based on moving bed bioreactor (MBBR) and multistage reactor (MSR) where said aerobic and anaerobic bacteria is grown on said plurality of moving bed bio reactor (MBBR) carrier balls for microbial degradation of pollutants in waste water; said anoxic tank (10) in step (b) is having an agitator (11) that is secured on the roof of said anoxic tank (10) and rotates at 50 rpm to keep the anoxic basin in mixing conditions; said suspended solids in step (c) are collected at the bottom of the plate settler clarifier through a funnel or a hopper as a sludge; said aerobic and anaerobic bacteria in step (d) grown on said plurality of moving bed bio reactor (MBBR) carrier balls is having a reactivation rate of 98% in water and that works in a wide temperature range of 5°C to 45°C; andsaid recycled waste water obtained in step (e) is having a pH ranging from 6- 9; biochemical oxygen demand (BOD) in a range of 3-10 mg / L; chemical oxygen demand (COD) in a range of 30-50 mg / L; and total suspended solids (TSS) in a range of 2-10 mg / L in 2-6 hours.

21. The method as claimed in claim 20, wherein said screened waste water in step(a) is obtained by removing the solid particles including cloth, plastics, wood logs or paper from the waste water by passing the waste water from said sewage water inlet (1) into a screen chamber (7) followed by removing oil from top surface of the waste water in an oil grease chamber (8) by an oil and grease trap.

22. The method as claimed in claim 20, wherein said denitrification process in step (b) is achieved by converting nitrates to nitrogen gas through heterotrophic bacteria that consumes BOD, recovers lost alkalinity, and improves sludge quality.

23. The method as claimed in claim 20, wherein said plate settler clarifier (13) in step (c) settles down the heavy substance (suspended solids) to obtain the clarified waste water by the steps of:(a) moving a stream of agitated waste water from top of a plurality of inclined plates of the plate settler clarifier (13);(b) flowing down said stream of agitated waste water through a feed channel underneath the plurality of inclined plates of the plate settler clarifier (13) followed by flowing up water inside the plate settler clarifier (13) between the plurality of inclined plates and settling suspended solids at bottom coarse surface of the plurality of inclined plates;(c) collecting the suspended solids settled at bottom coarse surface of the plurality of inclined plates in step (b) through a hopper or a funnel attached at bottom of the plate settler clarifier (13) to obtain a sludge; and(d) exiting clarified water from the plate settler clarifier (13) through an outlet channel at top surface of the plate settler clarifier (13).

24. The method as claimed in claim 20, wherein said plurality of reactor containers (14, 15, 16, 17) diffuses air in step (c) from the coarse bubble aerator (18) that is attached to the base of said plurality of reactor containers (14, 15, 16, 17).

25. The method as claimed in claim 20, wherein said plurality of moving bed bio reactor (MBBR) carrier balls in step (d) includes carrier balls made of a material with a density of 0.92-0.93 g / cm3such as high density polyethylene (HDPE).

26. The method as claimed in claim 20, wherein said treated waste water in step (e) is disinfected by chlorination by chlorine dosing or ozonation by ozone.

27. The method as claimed in claim 20, wherein the sludge is converted into manure in the sludge drying bed (22) at a time span of 15-20 days.

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