WO2020121150A1

WO2020121150A1 - An improved water filtration system

Info

Publication number: WO2020121150A1
Application number: PCT/IB2019/060549
Authority: WO
Inventors: Pathik GOPANI
Original assignee: Gopani Product Systems
Priority date: 2018-12-10
Filing date: 2019-12-09
Publication date: 2020-06-18

Abstract

An improved water filtration system is disclosed. According to an embodiment, the system can include a primary filter (Automatic Self backwashing) to receive contaminated water from a water source and restrict passage of contaminants, of the received water, having diameter greater than a first pre-defined diameter. A cartridge unit adapted to receive the water after primary filtration, and restrict passage of contaminants having diameter greater than a second pre-defined pores diameter (filter ratings), wherein the second pre-defined diameter is smaller than the first pre-defined diameter, and the water received after filtration by the cartridge unit contains contaminants less than 3-5 milligrams per litre. A secondary filter configured between primary filter and cartridge filters to remove suspended solids (TSS) of finer range (5-micron and lower diameter) from the water. A backwash unit adapted to receive the contaminants from the primary filter, and to separate water and solid particles (and oil-coated or waxy particles) of the received contaminants and pump back the separated water to initial storage tank for reprocessing. The separation of oily solids helps for safe disposal for environmental protection. The water filtration system can remove/reduce solid contaminants of size less than 5 micrometre diameter.

Description

AN IMPROVED WATER FILTRATION SYSTEM

TECHNICAL FIELD

[001] The present invention relates to water quality, liquid purification processing. In particular, the present disclosure provides a water filtration system. More specifically, it pertains to an improved water filtration system.

BACKGROUND

[002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[003] In a field under pilot study, the oil well produced water is required to be reinjectedinto subsurface formations for improved oil recovery or disposal. The produced water had problems like high suspended solids, oil content, scale and corrosion tendency as well as bacterial activity (GAB, SRB), which together are very detrimental for injection into injection wells. Thus, the water is initially treated at Effluent Treatment Plant (ETP) for control of such problems prior to injection or disposal into underground formations.

[004] After treatment at ETP, the effluent water is pumped to Water Injection Plant (WIP) for further treatment and injection into wells. Usually, the produced water is prone to SRB activity, which forms black precipitates of Iron Sulphide (FeS) due to sour corrosion caused by ¾S gas. This makes water blackish and gives smell of rotten eggs. Besides, the produced water has problems of corrosion, scales, formation fines, dispersed oil, bacteria/ slimes etc.

[005] The present experiment relates a filtration system at water injection plant (WIP), which receives effluent from ETP through a long pipeline. The effluent has wide variation in water quality with respect to suspended solids (TSS), bacterial activity and oil contents etc. The TSS values are normally between 30-50 mg/1, but sometimes the values could be as high as 120 mg/L or 300 mg/L due to some anomaly during ETP process. Sometimes, there are also traces of oily layers separating at surface in water samples.

[006] Presently, the injection water is being filtered through a set of multi-media filters (sand type) at the installation that can remove particles down to diameter 7-10 pm. After media filtration, the suspended solids (TSS) in water are reduced to 20-30 mg/1. Still, the filtered water has significant suspended solids (TSS) that include corrosion products (FeS, Fe203), waxy/oil coated particles, bacteria etc. which can pass through media filters. Presence of large amountof suspended particles (TSS) is quite detrimental to injection formations, if not controlled within prescribed limits. As per injection water standard, the TSS should be less than 3.0 mg/1 (relaxed limit-5 mg/1) for smooth injection into wells of low permeability reservoir.

[007] During filtration, the currently used media filters (sand, quartz, etc.) are backwashed (cleaned) with filtered water after achieving certain level of differential pressure (DR) across filter. The backwash water containing solids, oily matter, sludge etc. is collected in underground sumps. As soon as sumps get filled, the sump-water is pumped back to inlet storage tanks for reprocessing. Thus, the solids (also oily sludge) get re-mixed in injection water and solids in water find way to injection wells and damage formations. As sumps are underground tanks with huge solids and oily matter, these are not easily cleanable due to hazards and safety reasons. Besides, the sump water is also a big breeding ground for SRB activity, which contaminates injection system. Also, the existing filters do not incorporate self-cleaning facility, thus need periodic cleaning and require media replacement after certain period of time. Besides, the existing sand filters occupy large space, consume a large amount of water in backwashing resulting in wastage of water.

[008] There is, therefore, need in the art to provide an improved and efficient but reliable filter system that can be concluded from the above that in spite of all the efforts made, the solutions previously proposed and known in the prior art do not meet all the essential requirements which are taken into consideration in the present invention. Further, there is also a need in the art to provide an improved filter system that is self-cleaning and improved filtering efficiency to get the desired quality of water.

OBJECTS OF THE PRESENT DISCLOSURE

[009] Some of the objects of the present disclosure, which at least one embodiment herein satisfies are as listed hereinbelow.

[0010] It is an object of the present disclosure to provide an improved water filtration system.

[0011] It is an object of the present disclosure to provide an improved water filtration system that enables self-cleaning operation. [0012] It is an object of the present disclosure to provide an improved water filtration system that enables reduction of total suspended solids (TSS), which also include corrosion products (FeS, FeiCL), oily/waxy particles, other solids, bacterial products etc.

[0013] It is an object of the present disclosure to provide an improved water filtration system that can also remove suspended solids of size less than 5 micrometre diameter (< 5 pm).

[0014] It is an object of the present disclosure to provide an improved water filtration system that reduces suspended solids (TSS) in water to less than 3-5 milligrams per litre.

[0015] It is an object of the present disclosure to provide an improved water filtration system that enables Zero Liquid Discharge (ZLD) based on recycling of water from contaminants.

[0016] It is yet another object of the present disclosure to provide an improved water filtration system that does not allow accumulation of solid particles as well as oily solids that can be filtered out to extract water from reject of the primary filter.

SUMMARY

[0017] The present invention relates to water quality, liquid purification processing. In particular, the present disclosure provides a water filtration system. More specifically, it pertains to an improved water filtration system.

[0018] An improved water filtration system has been disclosed. According to an embodiment, the system can include a primary filter adapted to receive contaminated water from a water source. The primary filter can have a primary porous wire-mesh having pores of predefined diameter to restrict passage of contaminants, of the received water, having diameter greater than the diameter of said pores of primary wire-mesh. A backwash processing unit adapted to receive the contaminants (reject) from the primary filter, and to separate water and solid particles of the received contaminants. Acartridgeunit adapted to receive the water after primary filtration. The cartridge unit comprising porous filtering media to restrict/filter passage of contaminants of the received water after primary filtration. The contaminants having diameter greater than a second pre-defined pores-diameter (filter rating) are restricted by the cartridge filter-media. The second pre-defined pores-diameter of the cartridgefilter media is smaller than a first pre-defined diameter, and the water received after filtration by the cartridge unit contains contaminants less than 3-5 milligrams per litre(TSS testby NACE method, TM 0173-2015). [0019] In an embodiment, the system comprises a secondary filter configured between the primary filter and the cartridge unit to receive the water from the primary filter after primary filtration, wherein the secondary filter adapted to remove suspended solids (TSS) to the extent of 50% (or more) of solidload in finer range from 5micrometre and lower sizes, and allow passage of the remaining received water after a secondary filtration to the cartridge unit.

[0020] In an embodiment, the cartridge unit comprises one or more cartridge filters connected in cascade form.

[0021] In an embodiment, the system comprises a first water storage tank to receive and store the contaminated water from a water source, and provide water to the primary filter.

[0022] In an embodiment, the backwash processing unit can include a treatment tank for storage of said received restricted contaminants; a filter unit to enable separation of the water and the solid particles (oily-coated or waxy particles also); and a first pump to pump out the separated water to the first water storage tank.

[0023] In an embodiment, the first pre-defined diameter of the pores of the primary wire- mesh is about 5 to 10 micrometres, and the second pre-defined diameter of the poresof the cartridge filter media is about 0.5 to 5 micrometres (filter ratings).

[0024] Another aspect of the present disclosure pertains to a method for water filtration. The water filtration method can include receiving, by a primary filter, contaminated water from a water source; restricting, by a primary wire-mesh of the primary filter, contaminants of the received water having diameter greater than a first pre-defined diameter; allowing, by the primary filter, passage of the remaining received water after primary filtration; receiving, by thecartridge unit, the water from the primary filter after primary filtration; restricting, by a filter media of the cartridge unit, contaminants of the received water after primary filtration having diameter greater than a second pre-defined pores diameter (filter rating); and allowing, by the cartridge unit, passage of the remaining received water after filtration by the cartridge unit, wherein the water received after filtration by the cartridge unit contains contaminants less than 3-5 milligrams per litre(TSS testing by NACE TM 0173-2015 method).

[0025] In an aspect, the method of the present disclosure can further comprise reduction of a total suspended solids (TSS) by the secondary filter configured between the primary filter and the cartridge unit. [0026] In an aspect, the method of the present disclosure can further comprise receiving, by a backwash processing unit, the contaminants from the primary filter; and separating, by the backwash unit, water and solid particles of the received restricted contaminants.

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0028] FIG. lAillustrates an exemplary representation of the filtration system in accordance with an exemplary embodiment of the present disclosure.

[0029] FIG. IB illustrates an exemplary alternate representation of the filtration system in accordance with an exemplary embodiment of the present disclosure.

[0030] FIG. 2illustrates an exemplary alternate representation of the filtration system in accordance with an exemplary embodiment of the present disclosure.

[0031] FIG. 3 is a flow diagram illustrating a process for filtration in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION

[0032] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such details as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.

[0033] The present invention relates to water quality, liquid purification processing. In particular, the present disclosure provides a water filtration system. More specifically, it pertains to an improved water filtration system.

[0034] An improved water filtration system has been disclosed. According to an embodiment, the system can includea primary filter adapted to receive contaminated water from a water source.The primary filter can have a primary porous wire-mesh to restrict passage of contaminants, of the received water, having diameter greater than the diameter of said poresof first pre-defined primary wire-mesh, and allow passage of the remaining received water after primary filtration. A backwash processing unit adapted to receive the contaminants from the primary filter, and to separate water and solid particles of the received, restricted, contaminants. The cartridge unit adapted to receive the water after primary filtration.The cartridge unit comprising porous filter media to restrict passage of contaminants of the received water after primary filtration. The contaminants having diameter greater than a second pre-defined pores-diameter (filter rating) are restricted by the cartridge filter-media.

[0035] In an embodiment, the second pre-defined pores diameter (filter rating) of cartridge filter media is smaller than the first pre-defined diameter, andthe water received after the filtration by the cartridge unit contains contaminants (suspended solids) less than 3-5 milligrams per litre(TSS test by NACE method).

[0036] In an embodiment, thesystem comprises a secondary filter configured between the primary filter and the cartridgeunit to receive the water from the primary filter after primary filtration, wherein the secondary filter adapted to remove total suspended solids (TSS) to the extentof 50% (or more) of solid load in finer range from 5-micron to lower sizes, and allow passage of the remaining received water after a filtration by the cartridge unit. The deployment of the secondary filter reduces the solid load in water received at the cartridge unit.

[0037] In an embodiment, the cartridge unit comprises one or more cartridge filters connected in cascade form.

[0038] In an embodiment, the system comprises a first water storage tank to receive and store the contaminated water from a water source, and provide water to the primary filter.

[0039] In an embodiment, the backwash processing unit can include a treatment tank for storage of said received restricted contaminants; a filter unit to enable separation of the water and the solidparticles (oily-coated and waxy particles also, if any); anda first pump to pump out the separated water to the first water storage tank.

[0040] In an embodiment, the first pre-defined diameter of the pores of the primary wire- mesh is about 5 to 10 micrometres, and the second pre-defined diameter of the pores of the cartridge media is about 0.5 to 5 micrometres (filter ratings).

[0041] Another aspect of the present disclosure pertains to a method for water filtration. The water filtration method can include receiving, by a primary filter, contaminated water from a water source;restricting, by a primary wire-mesh of the primary filter, solid contaminantsof the received water having diameter greater than a first pre-defined diameter;allowing, by the primary filter, passage of the remaining received water after primary filtration;receiving, by a cartridge unit, the water from the primary filter after primary filtration;restricting, by a cartridge media of the cartridge unit, contaminants of the received water after primary filtration having diameter greater than a second pre-defined pores diameter (filter ratings); andallowing, by the cartridge unit, passage of the remaining received water after filtration by the cartridge unit, wherein the water received after filtration by the cartridge unit contains contaminants less than 3-5 milligrams per litre (TSS test by NACE TM 0173-2015 method).

[0042] In an aspect, the method of the present disclosure can further comprise receiving, by a backwash processing unit, the contaminants from the primary filter; andseparating, by the backwash unit, water and solid particles (oily-coated or waxy particles also) of the received restricted contaminants.

[0043] In an aspect, the method of the present disclosure can further comprise removing/ reducing of total suspended solids (TSS) by a secondary filter configured between the primary filter and the cartridge unit. The secondary filter reduces the solid load in water on the cartridge filter media and also improves filtration efficiency of system.

[0044] FIGs. 1A and IBillustrate an exemplary representation of the filtration system in accordance with an exemplary embodiment of the present disclosure.

[0045] In an embodiment, filtration system 100 can include a primary filter 102 with backwash collection & processing unit 108 for recycling of reject water from filter 102. The primary filter 102 can include a porous wire-mesh with pores of the first pre-defined diameter. The first pre-defined diameter of the pores of wire-mesh can be about 5 to 10 micrometres. In an embodiment, the primary filter 102 can include a Self-Backwashing Automatic Filter.

[0046] In an embodiment, the contaminated water from the source can be fed directly to the primary filter 102 or the contaminated water can be fed to the first water storage tank 112. The first water storage tank 112 can be used to store the contaminated water and thereby providing the contaminated water to the primary filter 102 for filtration. The primary filter 102 is fully automatic self-backwashing filter. In primary filtration, the contaminants (suspended solids) get deposited on primary filter 102 and get backwashed automatically. After a predetermined degree of contamination has been reached, the filter material is cleaned by backwashing a small quantity of filtered medium. The backwash of the impurities is executed by the reject device built-in within the filter.

[0047] The backwash water containing solids residue, with oily solids can get collected in tank within backwash processing facility, which is having tank, pump, manifold/piping, filters etc. 108. The backwash water (reject) is filtered and separated water is pumped to storage tank 112 and the solids residue (oily waste) is managed as per environmental laws. Thus, by installing backwash unitl08, the wastage of water is prevented and Zero Liquid Discharge System is created. It would be appreciated by the person skilled in the art that the system 100 does not waste water and thus the efficiency of the filter can be increased by reusing the water separated from the backwash unit.

[0048] In an embodiment, the backwash processing unit 108 further separates the contaminants into solid particles and water. The solid waste particles thus collected are separated out by a filter installed in backwash unit 108 can be either collected or discarded. Further, the water thus separated out by backwash unit 108 can be sent to the first water storage tank 112. It would be appreciated by the person skilled in the art that backwash processing unit 108 (tanks, manifold/piping, pump filter etc.) is installed to prevent wastage of water and to manage the (oily) solids waste rejected by primary filter 102. Thus, a Zero Liquid Discharge (ZLD) system can be created and solid waste can be managed safely.

[0049] In an embodiment, asecondary filter 104 receives the water after primary filtration 102. The secondary filter 104 can have a secondary porous media selected on the basis of contaminants in water received after primary filtration. The secondarymedia selected to reduce about 50% (or more) of all suspended particlesload below 5 micrometre size (< 5.0pm) from water received after primary filtration. The water thus allowed passing after a secondary filtration can be fed to a cartridge unit 106. In an embodiment, the cartridge unit 106 can include a porous cartridge filtermedia with pores of thesecond pre-defined diameter(filter ratings). The second pre-defined diametercan be about 0.5 to 5 micrometres (filter ratings). The water thus allowed passing after filtration by the cartridge unit 106 can be fed to a second water storage tank 110. It would be appreciated by the person skilled in the art that the system 100 is capable of rejecting or filtering out particles or contaminants of diameter even below 5 micrometre range.

[0050] In an embodiment, the primary filter 102 is a fully automatic filter having self cleaning backwash facility, which can separate suspended solids on primary wire-mesh. The backwashing (reject) of automatic filter is collected in backwash processing unit 108, which has tank(s), manifold/piping, fittings, pump, filter etc. This backwash unit, separates contaminants solids and separated water is pumped back to the first storage tank 112 for reprocessing. The solid wastes can be managed as per pollution control norms and water wastage is prevented. Thus, a ZLD can be created to prevent wastage of water and to avoid pumping of water containing solid waste.

[0051] In an embodiment, the filtration system 100 comprising two automatic filters the primary filter 102 and the secondary filter 104, position of the primary filter 102 and the secondary filter 104 can be interchanged (as shown in FIG. IB) depending on solids impurities in water. In an exemplary embodiment, the filtration system 100 can be used without the primary filter 102 or the secondary filter 104 on the basis of total suspended solid (TSS) and nature of solids.

[0052] In an embodiment, the filter system 100 can also reject oily matteralong with suspended solids in the form of waxy and oily-coated particles from the produced water. Thus, primary filter 102 (with the secondary filter 104) has advantage for removal of suspended solids alongwith oily materials, which is extremely important for good performance of downstreamthe cartridge unit 106. It would be appreciated by the person skilled in the art that removal of solids alongwith oil-coated or waxy particles also prevents flow of these solids with injection water into wells that can cause damage to injection wells formations. High-pressure pumps for injection into wells are depicted in diagram at 114-1 and 114-2.

[0053] FIG. 2 illustrates an exemplary alternate representation of the filtration system in accordance with an exemplary embodiment of the present disclosure. The FIG-1 and FIG-1A are next higher versions of FIG.2 for filtration.

[0054] In an exemplary embodiment, disclosed filtration system 200 can include a primary filter 202 with a backwash processing unit 206. The primary filter 202 can include a porous wire-mesh (SS or other material) with pores of a first pre-defined diameter. The first pre-defined diameter of the pores of wire-mesh can be about 5 to 10 micrometres. The contaminated water from the source can be fed to the primary filter 202. The source can include a first storage tank 210. The first storage tank 210 can be used to store the contaminated water and thereby providing the contaminated water to the primary filter for filtration.

[0055] In primary filtration, the solid contaminants get deposited on primary wire-mesh of primary filter 202 and backwashed automatically. The primary filter 202 is fully automatic self-backwashing filter. After a predetermined degree of contamination has been reached, the filter material is cleaned by backwashing a small quantity of filtered medium. The backwash of the impurities is executed by automatic reject device built-in within the filter.

[0056] In an embodiment, the backwash processing unit 206 can further separate the contaminants into solid particles and water. The solid waste particles, thus collected are separated out by a filter installed in the backwash processing unit 206can be either collected or discarded. Further the water thus separated out by the backwash unit 206 is pumped back to first water storage tank 210. [0057] In an embodiment, the cartridge unit 204 can include a porous cartridge filter media with pores of a second pre-defined diameter (filter ratings). The second pre-defined diameter can be about 0.5 to 5 micrometres (filter ratings). The water thus allowed passing after filtration by the cartridge unit 204 can be fed to a second water storage tank 208. It would be appreciated by the person skilled in the art that the system 200 is capable of rejecting or filtering out particles or contaminants of diameter less than 5 micrometres.

[0058] In an embodiment, the primary filter 202 is a fully automatic self-cleaning backwash filter, which can separate suspended solids on primary wire-mesh. The backwash (reject) of automatic filter is collected in backwash processing unit 206, which has a storage tank, manifold/ piping, fittings, pump, filter etc. This unit 206 separates solid waste particles (oily-coated also) and water and a first pump to pump out the separated water to storage tank 210 for reprocessing. The (oily) solid wastes can be managed as per pollution control norms and water wastage is prevented. Thus, a ZLD can be created to prevent wastage of water and to avoid pumping of water containing solid waste.

[0059] In an embodiment, the system 200 can also reject of oily matter along with suspended solids in the form of waxyand oily-coated particles from produced water. Thus, primary filter has an advantage for removal of suspended solids along with oily materials, which is extremely important for good performance of downstream the cartridge unit. It would be appreciated by the person skilled in the art that removal of solids including oily- coated and waxy particles also prevents flow of oily matter with injection water into wells that can cause damage to injection wells perforations. High-pressure injection pumps are depicted in diagram at 212-1 and 212-2. In an embodiment, the cartridge unit 204 comprises one or more cartridge filters.

[0060] FIG. 3 is a flow diagram illustrating a process for filtration in accordance with an embodiment of the present disclosure.

[0061] In an embodiment, the process of filtration of water can be initiated at step 302, which pertains to receiving contaminated water from a water source by the primary filter. The water source can be effluent treatment plant, produced water, contaminated water from sea, river, pond and the like any source or can be stored in first storage tank 112. Further, at step 304, the solids contaminants with diameter greater than the first pre-defined diameter are restricted by the primary wire-mesh of the primary filter 102. Further, at step 306, the primary filter 102 allows passage of the water after primary filtration. Further, step 308 pertains to receiving the water from the primary filter after primary filtration, by the secondary filter 104. The secondary filter 104 comprising a filter media having pores sizes selected such as to remove 50% (or more) of all particles of 5-micrometre diameter and smaller sizes. This step 310 removes/ reducesall solidparticles from water from 5.0 microns to the smaller sizes, which reduces solid load on the one or more cartridge filters of the cartridge unit 106installed at downstream. Further, step 312, allows passage of remaining water after secondary filtration. The next step 314 pertains to receiving water after secondary filtration, by the cartridge unit 106. The filter cartridge unit 106 can include one or more cartridges arranged in a cascade formation.

[0062] Step 316pertains to restricting of contaminants of the received water after secondary filtration by the cartridge filter media. The contaminants having diameter greater than a second pre-defined diameter are restricted from passage. Further, step 318 pertains to allowing passage of the remaining received water by the cartridge unit 106 after filtration by the cartridge unit 106. The water received after the filtration from the cartridge unit 106 contains contaminants (suspended solids) less than 3-5 milligrams per litre.

[0063] As an alternate representation of the filtration system, the water after primary filter, 306 can be received at the cartridge unit 204 at 316 as per filtration system as shown in FIG. 2. This set-up arrangement can be used in certain cases on the basis of inlet water quality. Further step 318 pertains to allowing passage of the remaining water after filtration by the cartridge unit 106, wherein the water received after filtration from the cartridge unit 106 contains solid contaminants less than 3-5 milligrams per litre. Further, the system can also remove/reduce thesolid contaminants of size less than 5 micrometres.

[0064] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE PRESENT DISCLOSURE

[0065] The present disclosure provides an improved water filtration system.

[0066] The present disclosure provides an improved water filtration system that enables self-cleaning operation.

[0067] The present disclosure provides an improved water filtration system that enables reduction of total suspended solids (TSS), which also include corrosion products (FeS, FeiCF), oily/waxy particles, other solids, bacterial products etc. [0068] The present disclosure provides an improved water filtration system that can remove/ reduce suspended solids of less than 5 micrometre diameter.

[0069] The present disclosure provides an improved water filtration system that reduces suspended solids (TSS) in water to less than 3-5 milligrams per litre (Test by NACE TM 0173-2015 method for injection water quality).

[0070] The present disclosure provides an improved water filtration system that enables Zero Liquid Discharge (ZLD) based on recycling of water from contaminants.

[0071] It is another object of the present disclosure to provide an improved water filtration system that does not allow accumulation of solid particles as well as oily matter (oil-coated waxy particles) and that can be filtered out to extract water from reject of the primary filter. The backwash unit helps for safe disposal of oily solids in the environment.

Claims

We Claim:

1. A water filtration system, said system comprising:

a primary filter (102) adapted to receive contaminated water from a water source, wherein the primary filter comprising a primary filter wire-mesh to restrict passage of solids contaminants, of the received water, having diameter greater than a firstpre- defined diameter of pores ofwire-mesh, and allow passage of the remaining received water after a primary filtration;

a backwash processing unit (108) adapted to receive the contaminants from the primary filter (102), and to separate water and solid particles of the received contaminants; and

a cartridge unit (106) adapted to receive the water after primary filtration, wherein each cartridge filter of the cartridge unit (106) comprising a media to restrict passage of contaminants of the received water after the primary filtration having diameter greater thana second pre-defined diameter, and allow passage of the remaining received filtered water after a filtration by cartridge unit (106),

wherein the secondpre-defined diameter is smaller than the first pre-defined diameter, and

wherein the water received after filtration by the cartridge unit contains contaminants less than 3-5 milligrams per litre.

2. The system as claimed in claim 1, wherein said system comprises a secondary filter (104) configured between the primary filter (102) and the cartridge unit (106) to receive the water from the primary filter after primary filtration, wherein the secondary filter (104) adapted to remove about 50% (or more) of total suspended solids (TSS), and allow passage of the remaining received water after a secondary filtration to the cartridge unit (106).

3. The system as claimed in claim 1, wherein the system enables removal of the suspended solidshaving diameter less than 5 micrometres.

4. The system as claimed in claim 1, wherein the cartridge unit (106) comprises one or more cartridge filters connected in cascade formation.

5. The system as claimed in claim 1, wherein the backwash processing unit 108 comprises:

a treatment tank for storage of said received restricted contaminants; a backwashfilter unit to enable separation of the water and the solid particles; and a first pump to pump out the separated water to the first water storage tank.

6. The system as claimed in claim 1, wherein the first pre-defined diameter of the pores of the primary wire-mesh is about 5 to 10 micrometres.

7. The system as claimed in claim 1, wherein the second pre-defined diameter of the pores of the cartridge filter media is about 0.5 to 5 micrometres.

8. A water filtration method, said method comprising:

receiving, by a primary filter (102), contaminated water from a water source; restricting, by a primary wire-mesh of the primary filter (102), contaminants of the received water having diameter greater than a first pre-defined diameter;

allowing, by the primary filter (102), passage of the remaining received water after primary filtration;

receiving, by cartridge unit (106), the water from the primary filter after primary filtration;

restricting, by a cartridge filter media of the cartridge unit (106), contaminants of the received water after primary filtration having diameter greater than a second pre defined diameter; and

allowing, by the cartridge unit (106), passage of the remaining received water after filtration by the cartridge unit (106), wherein the water received after filtration by the cartridge unit contains solid contaminants less than 3-5 milligrams per litre.

9. The method as claimed in claim 8, wherein said method comprises:

receiving, by a backwash unit (108), the contaminantsfrom the primary filter (102); and

separating, by the backwash unit (108), water and solid particles of the received restricted contaminants.

10. The method as claimed in claim 8, wherein said method comprises of a secondary filter (104) configured between the primary filter (102) and cartridge unit (106) for removal of 50% (or more) of suspended solids from total suspended solids (TSS) and allowing passage of the remaining received water after secondary filtration to the cartridge unit (106).