CN1594147A - Water treatment method for recycling bath sewage using biological active carbon - Google Patents

Abstract

The invention discloses a water treatment method for realizing the recycling of bathing sewage by mainly using biological activated carbon, and relates to a treatment method for recycling the sewage in the bathing industry. In the past, after bathing wastewater was treated, it still could not be recycled as bathing water, which caused water waste to a certain extent. The method of the present invention includes A. coagulation-sedimentation, pretreatment process of filtration and physicalization, B. entering the immobilized bioactivated carbon reactor, C. membrane filtration, and D. UV disinfection four processes, wherein the immobilized organism described in the B step Activated carbon is installed inside the activated carbon reactor, and engineering bacteria are immobilized on the activated carbon, and the engineering bacteria are anionic surfactant degrading bacteria and/or COD degrading bacteria and/or nitrifying bacteria. The water quality treated by the method of the invention can reach the Hygienic Standards for Drinking Water Quality (2001). The method of the invention is applied in the treatment of bathing wastewater, which can greatly reduce the price of bath water and reduce the discharge of urban sewage.

Description

A water treatment method based on biological activated carbon to realize the recycling of bathing sewage

Technical field:

The invention relates to a water treatment method capable of recycling bath sewage.

Background technique:

my country is a water-short country, especially in the northern region, where water resources are seriously insufficient, which has become one of the key factors restricting social and economic development. While water resources are insufficient, there is also a serious waste of water resources. The reuse rate of water in various industries is low. A large amount of precious water resources are discharged as waste water without being used or only after one-time use. It is imperative to save water and develop new water resources. The recycling of various types of sewage is one of the important development trends today.

The bathing industry is an industry that develops rapidly along with the economic development of our country and the improvement of people's living standards, and various bathing places are spread all over large and small cities. The bathing industry is a large water consumer in cities, and a medium-sized bathing pool consumes hundreds of tons of water per day. Therefore, the bathing industry has a great potential for water saving and can become a major water-saving household. On the other hand, many cities use water price as an economic lever to adjust the contradiction between urban water supply and demand and save water. For example, the water price issued by Harbin City has adjusted the water price of the bathing industry from the current 5 yuan/ton to 10 yuan/ton. High water prices will inevitably lead to the bathing industry to try to save water and improve the water reuse rate.

In the past, the main ways of using bathing wastewater after treatment were as industrial water supply, farmland irrigation, watering green land roads, water fountains, or as miscellaneous water for cleaning cars and flushing toilets. It cannot be recycled as bathing water. cause water waste to a certain extent.

Invention content:

The purpose of the present invention is to provide a water treatment method that makes the treated water as a supplement of bath water, and can be recycled, mainly using biological activated carbon to realize the recycling of bath sewage. The method includes A. coagulation-sedimentation, filtration Physicochemical pretreatment process, B. entering the immobilized bioactive carbon reactor, C. membrane filtration, D. UV disinfection four processes, wherein the immobilized bioactive carbon reactor described in the B step is equipped with activated carbon inside, and fixed on the activated carbon There are engineering bacteria, which are anionic surfactant degrading bacteria and/or COD degrading bacteria and/or nitrifying bacteria. The present invention applies immobilized bioactive carbon reactor (i.e. IBAC reactor) in the method, raw water (bathing wastewater) enters the IBAC reactor on the basis of the pretreatment of coagulation-sedimentation and filtration; and the composition of the IBAC reactor It is to compound the high-efficiency engineering bacteria artificially separated, screened and domesticated into dominant bacteria, and fix them on activated carbon. It mainly removes the pollutants still contained in the water after pretreatment, and can further reduce the permanganate index and inferior Methanol blue active substance, turbidity, ammonia nitrogen and other indicators. The IBAC reactor realizes simultaneous removal of various pollutants and plays a huge role in ensuring the quality of effluent water. Through the analysis of GC/MS experimental detection results, the organic pollutants contained in the water after IBAC treatment are greatly reduced in quantity and type, which can further ensure the safety of reused water. The effluent from IBAC enters the membrane module, and the membrane module mainly plays the role of interception, removes fine particles and microorganisms in the water, and plays a role in preliminary disinfection of the reused water. Index analysis, all do not contain bacterium and coliform group in the effluent water after membrane effluent and UV disinfection, have guaranteed that the water quality of reclaimed water reaches the requirement of hygienic standard, and the water quality after using the method of the present invention can reach the hygienic standard of drinking water quality ( 2001).

Description of drawings:

Fig. 1 is a schematic flow chart of strain separation of the present invention, Fig. 2 is a schematic diagram of a device for strain expansion cultivation, and Fig. 3 is a process flow diagram of a treatment method of the present invention.

Detailed ways:

Specific implementation mode one:

The water treatment method of this embodiment includes A. pretreatment process of coagulation-sedimentation, filtration and materialization, B. entering immobilized bioactivated carbon reactor, C. membrane filtration, D. UV disinfection four processes:

The pretreatment method described in step A is: (a). Coagulation: add polyaluminum chloride coagulant to the sewage, the dosage is 10-50mg/L, and the coagulation time is not more than 30min; (b). Precipitation: then static precipitation for 10-30 minutes; (c). Filtration: then pass through the quartz sand filter column, the column height of the quartz sand filter column is 2-2.5m, the thickness of the filter layer is 1.2-1.5m, the supporting layer The thickness is 0.1~0.4m; the filtration rate is 7~20m/h.

The interior of the immobilized bioactivated carbon reactor described in step B is equipped with activated carbon, and the overall height of the immobilized bioactivated carbon reactor is 200-300cm. layer, the upper part of the supporting layer is activated carbon, and the height of activated carbon is 100-150 cm. In this embodiment, the overall height of the immobilized bio-activated carbon reactor is 200 cm, and the bottom of the plexiglass column with an inner diameter of φ4.5 cm has a particle size of 10-20 cm. , the gravel with a height of 10cm is the supporting layer, and then the granular carbon with a particle diameter of 4.5cm is filled, and the filling height is 110cm, and engineering bacteria are fixed on the activated carbon, and the engineering bacteria are anionic surfactant degrading bacteria and/or degrading COD bacteria and/or nitrifying bacteria; the method of immobilizing engineering bacteria on activated carbon is as follows: first, soak and rinse the activated carbon with tap water until the water is clear and transparent; pour off the water and put it into the column to a specified height; Inject the engineered bacteria liquid into the column, after submerging the carbon layer, release it at a flow rate of 4 hours, and rinse it with tap water for 15 minutes after 24 hours to complete the immobilization of the engineered bacteria on the activated carbon.

Engineering bacteria refer to the dominant microbial populations that are purely cultured and mixed with high activity in actual biological treatment devices through isolation, screening and domestication, as well as the use of bioengineering technology, directional selection and breeding. In order to obtain highly active engineered bacteria, the provenance should be found first, which is the purpose of screening. Moreover, the screened engineering bacteria must be guaranteed not to be pathogenic microorganisms.

The preparation process of the aforementioned engineering bacteria is as follows: a. screening: (1) soil, mud on the drainage well wall of the bath, bath waste water are added in the triangular flask containing 150mL of basic medium to keep the liquid state in the bottle, and cultivated at constant temperature. When the culture solution is turbid, use a sterile pipette to absorb the culture solution, and transfer it into another Erlenmeyer flask containing 150mL of basal medium; do this for 3 to 6 consecutive transfers, and finally obtain the microorganisms in which the required engineering bacteria are absolutely dominant. Mixed culture; (2) Separation by coating: use a sterilized pipette to draw the enriched culture solution, add it to a conical flask containing 90mL sterilized water, add several glass beads, and shake fully; prepare a series of dilutions , take one drop of each 10 ^-5 to 10 ^-8 dilution, and spread it on the culture agar plate containing bath water and the above-mentioned anionic surfactant with a sterilized spatula, and make two parallel samples for each dilution, and the coated After the plates were allowed to stand at room temperature for 2 hours, they were incubated in an inverted incubator for 4 to 6 days. (3) Separation by streaking: select a plate with about 40 colonies, place it at room temperature for 4 to 6 days, so that the properties of the colony can be fully expressed, pick a single colony and transfer it to an inclined test tube, and then separate the plates with different properties The colony of the b. culture and domestication: the purpose of cultivation and domestication is to pass eutrophication to oligotrophic, The repeated acclimatization process from oligotrophic to eutrophic ultimately enabled the screened strains to grow in bath water and degrade anionic surfactants in bath water. The culture solution used in the cultivation and domestication process is to reduce the concentration of the nutrient solution in turn, and at the same time gradually increase the proportion of domesticated water samples to achieve lean culture, and then reduce the proportion of domesticated water samples in turn, while gradually increasing the concentration of nutrient solution to achieve enrichment. The operation of cultivating, this process is repeated, that is, the domestication process is completed; the domestication process is completed, and the required engineering bacteria are obtained; the specific process of the cultivation and domestication of the engineering bacteria is: the basic medium is numbered according to the concentration of the bath water, starting from the highest Concentration culture medium to low concentration medium are numbered as No. 1 to No. 11, that is: No. 1 medium: 100% basic medium; No. 2 medium: add 10 parts of bathing medium to 90 parts by weight of No. 1 medium Water; No. 3 medium: add 20 parts of bathing water to No. 2 medium of 80 parts by weight; ... No. 10 medium: add 90 parts of bathing water to No. 9 medium of 10 parts by weight; Medium No. 11: 100% bath water;

The pure bacterial liquid accounting for 5% of the weight of the basal medium was cultured at 30°C for 48 hours with No. 1 medium as the nutrient source, and then the bacterial liquid was transferred from No. 1 medium to No. 2 medium, cultivated at 30°C for 48 hours, and then Transfer the bacterial liquid from No. 2 medium to No. 3 medium, and incubate at 30°C for 48 hours... Transfer the bacterial liquid from No. 10 medium to No. 11 medium, and incubate at 30°C for 48 hours; then Then transfer the bacterial liquid from No. 11 medium to No. 10 medium, and incubate at 30°C for 48 hours, then transfer the bacterial liquid from No. 10 medium to No. 9 medium, and incubate at 30°C for 48 hours..... .Finally, transfer the bacterial liquid from No. 2 medium to No. 1 medium, and incubate at 30°C for 48 hours; this process is a cycle;

Cultivate 4 cycles according to the above method to obtain the engineering bacteria. The screened engineering bacteria can completely use the bath water as a nutrient source, and the polluting components in the bath water can be oxidized and degraded through aeration culture.

Figure 1 is a schematic diagram of the strain separation process, wherein, process 1 is dilution and pouring into plates, process 2 is picking typical colonies and transferring them to tubes, process 3 is separating plates by streaking, process 4 is picking typical colonies and transferring tubes, process 5 is picking typical colonies and transferring them to tubes. The process is to streak the plate and separate, and the 6 process is to pick typical bacteria and transfer them to tubes.

In the aforementioned (1) step, when the prepared engineering bacteria are anionic surfactant-degrading bacteria, the composition and content of the basal medium are as follows: (NH ₄ ) ₂ SO ₄ 1.0g, MgSO ₄ 7H ₂ O 0.3g, KH ₂ PO ₄ 0.3g, NaCl 0.3g, yeast extract 0.1g, anionic surfactant 0.1g, distilled water 1000mL, pH7.2, sterilize at 121°C for 20min;

In the aforementioned (1) step, when the prepared engineering bacteria are COD-degrading bacteria, the composition and content of the basal medium are as follows: beef extract 3g, peptone 10g, NaCl 5g, distilled water 1000mL, pH 7.2, sterilized at 121°C for 30min.

In the aforementioned (1) step, when the engineering bacteria prepared are nitrifying bacteria, the composition and content of the basal medium are as follows: NaNO ₂ 1.0g, Na ₂ CO ₃ 1.0g, NaH ₂ PO ₄ 0.25g, CaCO ₃ 1.0g, K ₂ HPO ₄ 0.75g, MnSO ₄ 0.01g, MgSO ₄ ·4H ₂ O 0.03g, distilled water 1000mL, pH 7.2, sterilized at 121°C for 30min.

After the desired engineering bacteria are obtained, they can also be expanded for cultivation: the domesticated bacteria solution is used as the source of the bacteria, and the mixed culture medium is used for expanded cultivation. The culture device is shown in Fig. 3, wherein 7 is an oxygen pump, 8 is a sample inlet, 9 is an aeration head, and 10 is a water outlet.

Culture conditions: 30°C, 48h aeration.

Cultivation method: add 5% of the pure bacterial liquid to the base medium of engineering bacteria, aerate at 30°C for 48 hours, then take out the engineering bacteria and put them into the base medium of engineering bacteria accounting for 90% of the total weight, bath water In the mixed liquid accounting for 10% of the total weight, at 30°C, aerate for 48 hours, then take out the engineering bacteria, put them into the mixed liquid containing 80% of the total weight of the engineering bacteria basic medium, and 20% of the total weight of bath water, at 30°C , 48h aeration...Take out the engineering bacteria, put them into the mixed liquid of the engineering bacteria basic medium accounting for 10% of the total weight, bathing water accounting for 90% of the total weight, 30 ℃, 48h aeration, and then the engineering bacteria Take out the bacteria, put them into 100% bath water, 30°C, and aerate for 48 hours until the required amount of bacteria solution is 10 ³ ~ 10 ⁵ cfu/mL, that is, the amount of bacteria required for immobilization can be reached for subsequent tests use.

The membrane filtration process described in step C adopts a microfiltration membrane or an ultrafiltration membrane, and the pore size of the membrane is less than 0.1 μm. The membrane can give full play to its interception effect and realize the interception of particulate matter and microorganisms.

The UV disinfection process described in the D step is to use drinking water to purify the ultraviolet disinfection tube for disinfection.

Specific embodiment 2: This embodiment is a comparative experiment for verifying the beneficial effects of the present invention.

The existing technology adopts the following methods to treat bathing sewage: raw water→micro-flocculation filter→hollow fiber ultrafiltration membrane→disinfection→reuse, the water quality after treatment is no color, no smell, LAS0.34mg/L, total number of bacteria 100cfu /ml; the number of coliform bacteria is greater than 3/L water sample, and these indicators can meet the water quality standard for domestic miscellaneous water (CJ25.1-89). The treated water can be used for miscellaneous purposes such as landscaping, washing cars, and showering roads and toilets.

The water quality conditions of the bath wastewater used in this test are as follows: temperature 30-35□; chroma 5-15 degrees; turbidity 35-120NTU; pH6.8-8.4; strong bath fragrance; permanganate index 10.0-75.0 mg/L; active substance of methylene blue 0.50-5.32mg/L; ammonia nitrogen 0.33-2.25mg/L; total number of bacteria 1.1×10 ⁴ -1.8×10 ⁴ cfu/ml; coliform number greater than 1600/100mL water sample. After adding coagulant, the bathing wastewater enters the coagulation tank, sedimentation tank, sand filter, and then enters the IBAC reactor, and then the water can be discharged after membrane filtration and UV disinfection. Therefore, this method can be used for pretreatment, IBAC, membrane filtration and UV In the 4th part of disinfection, the data in the test are also segmented in this way.

Tests have shown that after coagulation-sedimentation and filtration, the turbidity 5.5-12NTU, permanganate index 5.60-14.00mg/L, anionic surfactant 0.60-2.59mg/L, smell and other indicators of bathing wastewater can be improved. The ammonia nitrogen in the bath water will increase after treatment at this stage, reaching 3.85-9.79mg/L.

The IBAC reactor used in this test is composed of the following method: the degraded organic matter, anionic detergent bacteria and nitrifying bacteria that are separated, screened and domesticated from bathing wastewater are used to form a high-efficiency engineering bacterial flora. The way of adsorption is fixed on activated carbon, which forms the IBAC device. After IBAC treatment, the turbidity is 1.06-3.72NTU, the permanganate index is lower than 3mg/L, the methylene blue active substance is lower than 0.30mg/L, the water with grade 0 smell and ammonia nitrogen is lower than 1mg/L. Through the analysis of GC/MS detection experiment results, it can be seen that a total of 48 kinds of organic substances were detected in the influent water of IBAC. After IBAC treatment, a total of 24 kinds of organic substances were detected. 32.4%. IBAC is a treatment unit that can effectively remove multiple pollutants in water at the same time.

Membrane filtration adopts the hollow fiber ultrafiltration membrane module produced by Tianjin Motianmo. MPa. After membrane filtration, the turbidity of the effluent is less than 1NTU, and other indicators are also reduced. Therefore, membrane filtration is a necessary part of ensuring water quality. Through the detection of the total number of bacteria and the total number of coliforms in the water before and after the overall method of treatment, it can be known that the raw water has undergone coagulation-sedimentation and filtration. After IBAC treatment, these two indicators are unqualified. After membrane filtration, these two indicators meet the requirements of life. Hygienic Standards for Drinking Water Quality (2001).

The UV ultraviolet disinfection tube used in this test is the NLC-008 ultraviolet disinfection tube produced by Fujian Xindalu. The requirements for the use of the equipment are that the T254 of the incoming water is ≥ 95%, and the treated water volume is ≤ 0.3t/h. Bacteria and coliforms were not detected after UV disinfection.

Therefore, it is necessary to adopt IBAC-based method in all aspects, and the effluent index of this method to treat bathing wastewater can reach the hygienic standard for drinking water quality (2001). Therefore the method of the present invention is applicable to the treatment of bath waste water, and the economic calculation of this method is: with the bath water consumption 0.2m ³ /person, the bath pool that adopts bath water reuse equipment has 150 people to take a bath every day on average, and this bath pool can save every day. Water consumption is 21m ³ , saving 124.2 yuan; in this way, 42,200 yuan can be saved a year (according to 340 days), and the equipment investment can be recovered in one year, with remarkable economic benefits.

Claims (9)

1, a kind of is the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, it is characterized in that this method comprises A. coagulation-precipitation successively, filters the pretreatment technology of materialization, B. enter the immobilized biological activated carbon reactor, C. membrane filtration, D.UV four processes of sterilizing, wherein the described immobilized biological activated carbon inside reactor of B step is equipped with gac, be fixed with engineering bacteria on gac, described engineering bacteria is bacterium and/or the nitrobacteria of anion surfactant degradation bacteria and/or degraded COD.

2, according to claim 1 is the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, the preparation process that it is characterized in that described engineering bacteria is as follows: a. screening: (1) joins mud, bath wastewater on soil, the bathing pool draining borehole wall to make in the triangular flask that contains basic medium 150mL and keeps liquid state in the bottle, constant temperature culture, when treating that muddiness takes place nutrient solution, with aseptic pipette, extract nutrient solution, move in another triangular flask that contains basic medium 150mL; Move so continuously and connect 3～6 times, just obtain the microorganism mixed culture that required engineering bacteria has comparative advantage at last; (2) coating separates: with the nutrient solution of sterilization pipette, extract through enrichment culture, adding contains in the triangular flask of 90mL aqua sterilisa, adds several granulated glass spherees, fully concussion; The preparation serial dilutions gets 10 ^-5～10 ^-8Each one of diluent is containing on the cultivation agar plate of bathing water and basic medium with the coating of sterilization scraper respectively, and each extent of dilution is made two parallel samples, and the flat board of coating is inverted incubator again and was cultivated 4～6 days after leaving standstill 2h under the room temperature; (3) line separates: the plate of choosing colony number about 40, at room temperature placed 4～6 days, the bacterium colony proterties is showed more fully, picking list bacterium colony is transferred on slant tube, the bacterium colony that will have various trait is again containing the purifying of ruling on the bathing water nutrition agar plate, dull and stereotyped inversion incubator 4～6 days; Repeat above operation, pure until dividing; B. cultivate and tame: the nutrient solution that cultivation and domestication process are adopted is the concentration that reduces nutritive medium successively, the ratio that increases the domestication water sample simultaneously gradually realizes the operation of poor cultivation, and then reduce the ratio of domestication water sample successively, the concentration of liquid of having additional nutrients gradually simultaneously realizes rich operation of cultivating, this process is promptly finished the domestication process repeatedly; The domestication end of processing promptly obtains required engineering bacteria;

In aforementioned (1) step, when the engineering bacteria of preparation was the anion surfactant degradation bacteria, the composition and the content of basic medium were as follows: (NH ₄) ₂SO ₄1.0g, MgSO ₄7H ₂O 0.3g, KH ₂PO ₄0.3g, NaCl 0.3g, yeast extract paste 0.1g, anion surfactant 0.1g, distilled water 1000mL, pH7.2,121 ℃ of sterilization 20min;

In aforementioned (1) step, when the engineering bacteria of preparation was the bacterium of degraded COD, the composition and the content of basic medium were as follows: extractum carnis 3g, peptone 10g, NaCl5g, distilled water 1000mL, pH7.2,121 ℃ of sterilization 20min;

In aforementioned (1) step, when the engineering bacteria of preparation was nitrobacteria, the composition and the content of basic medium were as follows: NaNO ₂1.0g, Na2CO ₃1.0g, NaH ₂PO ₄0.25g, CaCO ₃1.0g, K ₂HPO ₄0.75g, MnSO ₄0.01g, MgSO ₄4H ₂O 0.03g, distilled water 1000mL, pH7.2,121 ℃ of sterilization 30min.

3, according to claim 2 is the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, it is characterized in that the cultivation of described engineering bacteria and the detailed process of domestication are: with basic medium by containing the different numberings of bathing water concentration, be numbered 1～11 from the high-concentration culturing base to the lower concentration substratum, that is: No. 1 substratum: 100% basic medium; No. 2 substratum: the bathing water that 90 parts No. 1 substratum adding by weight is 10 parts; No. 3 substratum: the bathing water that 80 parts No. 2 substratum addings by weight are 20 parts; No. 10 substratum: the bathing water that 10 parts No. 9 substratum addings by weight are 90 parts; No. 11 substratum: 100% bathing water;

With the pure bacterium liquid that accounts for basic medium weight 5% with No. 1 substratum as nutrition source, cultivate 48h for 30 ℃, then with bacterium liquid from No. 1 substratum pipettes No. 2 substratum, cultivate 48h for 30 ℃, again with bacterium liquid from No. 2 substratum pipette No. 3 substratum, cultivate 48h for 30 ℃ ... bacterium liquid from No. 10 substratum pipette No. 11 substratum, is cultivated 48h for 30 ℃; And then with bacterium liquid from No. 11 substratum pipette No. 10 substratum, cultivate 48h for 30 ℃, again with bacterium liquid from No. 10 substratum pipette No. 9 substratum, cultivate 48h for 30 ℃ ... at last with bacterium liquid from No. 2 substratum pipette No. 1 substratum, cultivate 48h for 30 ℃; This process is an one-period;

Cultivate 4 cycles as stated above, promptly obtain described engineering bacteria.

4, according to claim 1,2 or 3 described be the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, it is characterized in that described pretreatment process is: (a). coagulation: in sewage, add the polymerize aluminum chloride coagulating agent, the throwing amount is 10～50mg/L, and the coagulation time is no more than 30min; (b). precipitation: quiescent setting 10～30min then; (c). filter: get final product through quartzy sand filtration post again.

5, according to claim 4 is the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, it is characterized in that the high 2～2.5m of post of described quartzy sand filtration post, and thickness of filter bed is 1.2～1.5m, support bed thickness 0.1～0.4m; Filtering velocity is 7～20m/h.

6, according to claim 1,2 or 3 described be the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, it is characterized in that described immobilized biological activated carbon reactor whole height be 200～300cm, its internal structure is, loading at the reactor inner bottom part highly is the supporting layer of 10～30cm, supporting layer top is gac, the height of gac is 100～150cm, described engineering bacteria is fixed on the gac get final product.

7, according to claim 6 is the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, it is characterized in that the method that described engineering bacteria is fixed on the gac is: at first, with gac with tap water soak, flushing, to water outlet as clear as crystal till; The branch that anhydrates that inclines, in the post of packing into to specified altitude; In the charcoal post, inject engineering bacteria bacterium liquid then, behind the submergence charcoal layer, emit, wash 15min with tap water behind the 24h, promptly finish engineering bacteria fixing on gac by the flow velocity of 4h circulation primary.

8, according to claim 1,2 or 3 described be the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, it is characterized in that described membrane filtration process for adopting microfiltration membrane or ultra-filtration membrane, the aperture of film is less than 0.1 μ m.

9, according to claim 1,2 or 3 described be the main water treatment method of realizing that bath sewage recycles with the biological activated carbon, it is characterized in that described UV sterilizing process is for adopting the uv sterilisation pipe of drink water purifying.

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