WO2015125063A1 - Procédé de purification d'eau et appareil correspondant - Google Patents
Procédé de purification d'eau et appareil correspondant Download PDFInfo
- Publication number
- WO2015125063A1 WO2015125063A1 PCT/IB2015/051149 IB2015051149W WO2015125063A1 WO 2015125063 A1 WO2015125063 A1 WO 2015125063A1 IB 2015051149 W IB2015051149 W IB 2015051149W WO 2015125063 A1 WO2015125063 A1 WO 2015125063A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- tank
- filter media
- unit
- treatment chemical
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000746 purification Methods 0.000 title claims abstract description 19
- 239000000645 desinfectant Substances 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 17
- 238000002203 pretreatment Methods 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 229940037003 alum Drugs 0.000 claims abstract description 6
- 244000005700 microbiome Species 0.000 claims abstract description 6
- 239000008394 flocculating agent Substances 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 239000003610 charcoal Substances 0.000 claims description 4
- 238000005189 flocculation Methods 0.000 claims description 4
- 230000016615 flocculation Effects 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000008213 purified water Substances 0.000 claims description 3
- 238000009287 sand filtration Methods 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 2
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 2
- 239000011790 ferrous sulphate Substances 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims 2
- 239000003651 drinking water Substances 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 241000282414 Homo sapiens Species 0.000 description 4
- 235000020188 drinking water Nutrition 0.000 description 4
- 235000012206 bottled water Nutrition 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 241000700605 Viruses Species 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000013270 controlled release Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 208000034817 Waterborne disease Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 235000011128 aluminium sulphate Nutrition 0.000 description 1
- 239000001164 aluminium sulphate Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
- 108700012359 toxins Proteins 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
- C02F9/20—Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/06—Aerobic processes using submerged filters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Definitions
- the present invention relates to a method of purification of water and an apparatus therefore. More particularly, the invention relates to a method of purification of water utilizing a bio-sand filter and to an apparatus for the method, which apparatus is easily assembled, portable and is capable of being safely air-dropped.
- Availability of safe drinking water is essential for healthy living of human beings.
- Water purification is essential as un-purified water may contain bacteria, viruses, toxins, dissolved heavy metals and other forms of dissolved impurities which when consumed may be adverse to the health of the population and may also propagate water-borne diseases.
- the present invention relates to a method for purification of water, where raw water in a first tank is purified by adding and mixing with a pre-treatment chemical. Flocculants in the pre-treated water are allowed to settle and introduced to a pre-strainer unit; the pre-strained water is transferred into a second tank containing a bio-sand filter media for filtration; the filtered water is subjected to a UV disinfectant unit and the water now is discharged for consumption.
- the pre-treated water is distributed evenly over a pre- strainer unit where the pre-strainer includes a filter media with a pore size between 25 ⁇ to 200 ⁇ , preferably with a pore size of 50 ⁇ . Additionally, the filter media used is of polyethylene cloth.
- the pre-treatment chemical and raw water is mixed for at least 15 minutes.
- the pre-treatment chemical used is preferably of alum or aluminum sulphate.
- the pre-strained water is transferred into a second tank by gravitational drop from the pre-strainer unit, the pre-strained water is subjected to a bio-sand filter media.
- the filtered water from the second tank now is introduced into the UV disinfectant unit from a perforated PVC pipe assembly positioned at the bottom of the bio-sand filter.
- a second aspect of the present invention relates to an apparatus for the method of purification of water comprising of:
- pre-strainer unit to receive pre-treated water from a first tank
- a mixing means including a stirrer and a blower device to mix pre- treatment chemical and the raw water in the first tank;
- the frame support is made of rigid members assemblable to provide a collapsible frame support and is capable of holding two water tanks.
- the first tank is positioned above a second tank.
- the tanks are formed by bags consisting of water impermeable flexible sheet which is of canvas sheet.
- a chemical dosage means is mountable on top of the first tank, and it is capable of discharging pre-treatment chemical into the first tank.
- the disinfectant unit is a UV disinfectant unit to disinfect living microorganisms in the pre-treated water.
- the disinfectant unit and the mixing means are powered by solar energy panel and a chargeable battery means. Alternatively, the disinfectant unit and the mixing means are powered using a permanent / fixed power supply.
- the second tank includes bio-sand filter media comprising layers of sand, charcoal, fine and course gravel, and activated carbon each layer being separated by a permeable layer, wherein the permeable layer is at least one of a polyethylene sheet and a textile sheet.
- FIGURE 1 is a perspective view of the framework to hold a first tank and a second tank in accordance with this invention
- FIGURE 2 is a front view of an assembled tank utilizing the framework illustrated in Figure 1 in accordance with this invention
- FIGURE 3 is a back view of an assembled tank shown in Figure 2 in accordance with this invention
- FIGURE 4 is a perspective view of a first assembly of perforated PVC pipe to be placed in the first tank in accordance with this invention
- FIGURE 5 is a perspective view of second assembly of perforated PVC pipe to be placed in the second tank in accordance with this invention
- FIGURE 6 is a flow diagram of the method of purification of water in accordance with this invention.
- FIGURE 7 is a diagrammatic see through perspective view of the purification apparatus minus the canvas sheet forming a tank in accordance with this invention
- FIGURE 8a and FIGURE 8b show a layout of a canvas sheet which is shaped to form a container for the raw water tank and the filtration tank before being fixed to the framework in accordance with this invention.
- FIGURE 1 discloses a perspective view
- FIGURE 2 a front view
- FIGURE 3 a rear view of a framework (13) to hold a first tank (10) and a second tank (12) in accordance with this invention.
- raw water collected from a water source such as lake or pond water, rain water, ground water, and river water is filled in a first tank (10) referred to as raw water tank.
- a pre-treatment chemical such as alum is added to a dripper system (1 1 ) to dispense the pre-treatment chemical into the first tank (10).
- the pre- treatment chemical is used to flocculate the raw water and can include aluminium sulphate (alum), polyaluminium chloride (PAC), ferrous sulphate, sodium aluminate, silicon derivates, lime or any chemical compound to facilitate flocculation of fresh water.
- the water is agitated using a mixer apparatus such as a stirrer and /or a blower commonly used to agitate or stir liquids contained in a receptacle.
- the mixer process is carried out for at least 15 minutes after which the treated water is allowed to settle for at least 30 to 90 minutes depending on the turbidity of water. Flocculated matter will settle at the bottom part of the first tank (10).
- FIGURE 7 which discloses a perspective view of the purification apparatus, the flocculated matter settled at the base of the tank is flushed out periodically by opening a discharge valve (15) attached to the basal region or base of the first tank (10).
- Pre-treated water from the first tank (10) is introduced into a second tank (12) referred to as the filtration tank via a first perforated pipe assembly (14) (see FIGURE 4).
- the pre-treated water in the upper part of the first tank (10) is introduced into the first perforated pipe assembly (14) via at least one valve controlled release pipe conduit (24) which is secured to the side wall of the raw water tank (10).
- the pre-treated water in the first perforated pipe assembly (14) flows down by gravitational force into a pre-strainer unit (16) placed in between the first tank (10) and the second tank (12).
- the first perforated pipe assembly (14) facilitates even distribution of water into the pre-strainer unit (16).
- the pre- strainer unit (16) includes a media to filter large solid particles.
- the filter media in the pre-strainer (16) is at least one sheet of polyethylene cloth with pores between 25 ⁇ to 200 ⁇ , preferably at best 50 ⁇ .
- the now strained water drops into the filtration tank (12) by gravitational force where it is filtered by a bio-sand filtration media (to be described later).
- the filtered water flows into a second perforated pipe assembly (18) (see FIGURE 5) at the bottom of the filter media from where it flows into a valve controlled discharge pipe (36) to a UV disinfection unit (20) and is discharged into a collection receptacle (not illustrated).
- the discharged water is now purified and is in a potable state.
- the apparatus comprises a rigid rectangular framework (13) to receive and hold at least two water tanks.
- the rigid rectangular framework (13) comprises of a metal framework, more preferably aluminum framework with dimensions such as 1 .2 m (L) x 0.6 m (W) x 1 .5 m (H).
- Canvas sheet (28) preferably of food grade such as Detex tarpaulin (see FIGURE 8a) shaped into an open six sided bag is secured to the rigid rectangular framework (13) to form a container like a box-shape structure (see FIGURE 8b).
- the edges of the non-shaped canvas sheet are secured together to form a water proof canvas bag to form a rectangular tank shaped container (30) (see FIGURE 8b) which is introduced into the upper portion as the first tank (10) and lower portion of the rigid rectangular framework (13) as the second tank (12).
- the upper edges of the canvas rectangular shaped container (30) are removably secured to the upper peripheral beams of the rigid rectangular framework (13).
- the base of the container rests on a first base plate (32) in the rigid framework.
- the base plate could be a wire-mesh tray or a plate with perforated holes or a solid plate.
- at least one valve controlled release pipe (24) is secured to the side of the container.
- the release pipe (24) is in fluid connection with the first perforated pipe frame assembly (14).
- a pre-strainer unit (16) is positionable below the first tank (10).
- the pre-strainer unit (16) places at least one sheet of filter material such as the polyethylene cloth with 25 ⁇ to 200 ⁇ micropores, preferably with 50 ⁇ micropores.
- the peripheral edges of the sheet are removably secured to the peripheral frame of the pre-strainer unit (16).
- a second tank (12) made of canvas sheet is secured to the second tank framework in the rigid framework.
- a second perforated PVC pipe assembly (18) is introduced onto the first base plate (32) of the second tank (12).
- a sand filter media is constructed.
- the sand filter media comprises of separate layers of sand, charcoal, fine and coarse gravel and activated carbon which are introduced onto the base of the second tank (12), above the second perforated PVC pipe assembly (18).
- Each media layer of sand, charcoal, gravel, activated carbon are separated by separate sheets of permeable material such as polyethylene cloth, textile cloth and material such as woven or non-woven plastics essentially to keep the different media separate and for ease of maintenance of the filter media.
- Water which has passed through the filter media enter the second perforated pipe assembly (10) and flow upward into a release pipe (36) whose end is secured to disinfector apparatus (20).
- a disinfector apparatus (20), preferably a UV light disinfector apparatus (20) is secured to the external side of the bottom region of the rigid framework (13). Water from the release pipe (36) is introduced into the UV light disinfector apparatus (20) at rate of at least 1 -20 liters/minute.
- the disinfected water where living microorganisms present in the water are killed by UV radiation is now discharged into a receptacle.
- the discharged water is purified and is potable.
- the present apparatus of the size described herein can yield up to 3,000 liter of potable water per day.
- the Table 1 below shows the parameters of the raw water being introduced into the first tank (10) and the parameters of the treated water as discharged from the UV disinfectant unit (20).
- Turbidity R ⁇ 1000 31 20 60 45 50 30 280 250 (NTU) W
- TCU Color (TCU) R ⁇ 100 12 10 12 13 15 12 22 20
- Table 1 Test results showing comparison between parameters of raw water and water treated by the present invention.
- a solar panel 38
- the solar panel (38) is connected to a modular power unit (40) and battery charging means to power the mixer apparatus and the disinfectant unit (20).
Landscapes
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Water Treatment By Sorption (AREA)
Abstract
L'invention concerne un procédé et un appareil de purification d'eau brute. Le procédé comprend les étapes consistant à : ajouter et mélanger un produit chimique de prétraitement, tel que l'alun, dans un premier réservoir contenant de l'eau brute, laisser décanter les floculants présents dans l'eau prétraitée du premier réservoir, filtrer préalablement l'eau décantée du premier réservoir et transférer celle-ci dans un second réservoir contenant un filtre à sable biologique, et introduire l'eau filtrée provenant du second réservoir dans une unité de désinfection par UV. L'invention concerne en outre un appareil de purification d'eau comprenant au moins deux réservoirs pouvant être assemblés sur un cadre support, une unité de pré-filtrage destinée à recevoir l'eau prétraitée provenant du premier réservoir, des supports de filtre à sable biologique placés dans le second réservoir, une unité de désinfection pour supprimer les micro-organismes vivants et des moyens de mélange pour mélanger le produit chimique de prétraitement et l'eau dans le premier réservoir. Les moyens de mélange et l'unité de désinfection par UV sont alimentés par une source d'énergie à panneaux solaires.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MYPI2014000457 | 2014-02-19 | ||
MYPI2014000457 | 2014-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015125063A1 true WO2015125063A1 (fr) | 2015-08-27 |
Family
ID=53877682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2015/051149 WO2015125063A1 (fr) | 2014-02-19 | 2015-02-17 | Procédé de purification d'eau et appareil correspondant |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2015125063A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110776121A (zh) * | 2019-11-23 | 2020-02-11 | 江苏蓝创环保科技有限公司 | 一种多级化污水处理设备 |
WO2021256330A1 (fr) * | 2020-06-17 | 2021-12-23 | 株式会社水循環エンジニアリング | Dispositif flexible de traitement des eaux usées |
RU2775552C1 (ru) * | 2021-03-30 | 2022-07-04 | Общество с ограниченной ответственностью "ИНВЭКО" (ООО "ИНВЭКО") | Способ очистки фильтрационных вод полигонов захоронения твердых бытовых отходов |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6419821B1 (en) * | 2000-02-25 | 2002-07-16 | Waterhealth International, Inc. | Apparatus for low cost water disinfection |
US20050023223A1 (en) * | 2001-10-20 | 2005-02-03 | Seisuke Takashima | Composite filter and method and apparatus for producing high purity water using hte composite filter |
US20060070947A1 (en) * | 2002-09-16 | 2006-04-06 | Wayne Conrad | Method and apparatus for treating water |
US20110303589A1 (en) * | 2009-01-13 | 2011-12-15 | Access Business Group International Llc | Gravity feed water treatment system |
US20120211430A1 (en) * | 2009-10-26 | 2012-08-23 | Jin Nak Choi | High speed filtration device using porous media, and backwash method thereof |
-
2015
- 2015-02-17 WO PCT/IB2015/051149 patent/WO2015125063A1/fr active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6419821B1 (en) * | 2000-02-25 | 2002-07-16 | Waterhealth International, Inc. | Apparatus for low cost water disinfection |
US20050023223A1 (en) * | 2001-10-20 | 2005-02-03 | Seisuke Takashima | Composite filter and method and apparatus for producing high purity water using hte composite filter |
US20060070947A1 (en) * | 2002-09-16 | 2006-04-06 | Wayne Conrad | Method and apparatus for treating water |
US20110303589A1 (en) * | 2009-01-13 | 2011-12-15 | Access Business Group International Llc | Gravity feed water treatment system |
US20120211430A1 (en) * | 2009-10-26 | 2012-08-23 | Jin Nak Choi | High speed filtration device using porous media, and backwash method thereof |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110776121A (zh) * | 2019-11-23 | 2020-02-11 | 江苏蓝创环保科技有限公司 | 一种多级化污水处理设备 |
WO2021256330A1 (fr) * | 2020-06-17 | 2021-12-23 | 株式会社水循環エンジニアリング | Dispositif flexible de traitement des eaux usées |
RU2775552C1 (ru) * | 2021-03-30 | 2022-07-04 | Общество с ограниченной ответственностью "ИНВЭКО" (ООО "ИНВЭКО") | Способ очистки фильтрационных вод полигонов захоронения твердых бытовых отходов |
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