56 results about "Drinking water quality standards" patented technology

The disclosed water-drop aeration biopretreatment-ultrafiltration combined purification technique for drinking water comprises: first, building the multistage water-drop aeration biopretreatment device; then, pumping the raw water once to remove the most ammonia nitrogen by cascade water-drop oxygenation and biological contact oxidation pretreatment and convert the micro dissolved organic into microbe cell; filtering by the protective porous ceramic-aggregate pond; followingly, leading into the ultrafiltration membrane module to reduce the micro organic, ammonia nitrogen, particulate matter, most seston, colloid, and bacteria till meeting the drinking water quality standard. This invention belongs to green technique without coagulant or chlorine, reduces cost and land area, and has wide application for small-scale drinking water treatment.

The invention provides a method for simultaneous removal of cadmium and thallium in raw water. The method comprises the following steps: step A, adding sodium hydroxide into raw water, adjusting a pH value to alkalescence and then adding potassium permanganate with a concentration of 0.3 to 0.8 mg / L; step B, adding sodium hypochlorite or liquid chlorine, wherein the concentration of added sodium hypochlorite or liquid chlorine is 0.5 to 2.5 mg / L in term of effective chlorine; step C, adding limewash into raw water having undergone a full oxidation reaction and adjusting a pH value to 8.5 to 9.0; step D, adding a flocculating agent, carrying out a flocculation reaction for 10 to 20 min and then carrying out deposition for at least 0.5 h so as to remove cadmium, thallium and colloids of manganese hydroxide and iron hydroxide through coprecipitation, wherein the pH value of water after precipitation drops to 7.0 to 8.5; and step E, filtering raw water obtained after precipitation by using quartz sand. The invention has the following beneficial effects: cadmium concentration of treated water is as small as the limit of a detection method, i.e., 0.02 mu g / L, or less than 0.02 mu g / L; thallium concentration of treated water is as small as the limit of a detection method, i.e., 0.01 mu g / L, or less than 0.01 mu g / L; and the pH value, manganese ions and iron ions of the treated water all meet requirements prescribed in drinking water quality standards.

The invention provides a liquid adsorbent and a method for controlling arsenic pollution of lake water, which relates to large-scale treatment of arsenic-polluted water. The adsorbent is reserve liquid formed by compounding iron salts FeCl3 or Fe2(SO4)3 or adding an appropriate amount of aluminum salts AlCl3 or Al2(SO4)3 with tap water or deionized water, and the mass concentration of the adsorbent is 100 to 600 g / L. The adsorbent in use is diluted by 10 to 30 times and then sprayed on the arsenic-polluted water. The adsorbent has the advantages of safety, low price, high arsenic removal efficiency and easy operation. A Yangzonghai arsenic-polluted water sample treated with the invention is detected through graphite furnace atomic absorption spectrometry and atomic fluorescence spectrometry, and detection results show that the arsenic removal rate of the invention can be greater than 92.7 percent, and the invention can reduce arsenic concentration from 0.110-0.130 mg / L to 0.003-0.008 mg / L which is lower than 0.050 mg / L specified by the national drinking water health standard (GB5749-2006) and 0.010 mg / L specified by the WHO drinking water quality standard.

The invention discloses a treatment method of high iron manganese and ammonia nitrogen compound pollution low temperature underground water. Natural zeolite is used as a raw material, a zeolite-basedmaterial is loaded with manganite, through impregnation of enrichment culture liquid, the material is loaded with microorganisms of nitrifying bacteria, iron and manganese oxidizing bacteria and the like, so that a multifunctional compound material of the zeolite loaded with the manganite and the microorganisms is obtained, a filter candle is filled with the multifunctional compound material, sequencing batch running is conducted according to four stages of inlet water adsorption, water emptying, air blasting for bio-regeneration and nitrate washing, meanwhile, iron, manganese and ammonia nitrogen in the low temperature underground water are purified, and thus effluent reaches the domestic drinking water quality standards.

The invention discloses an electrochemical autotrophic denitrification integral reactor for removing nitrate nitrogen in water, which comprises a barrel type foaming nickel cathode, a graphite anode, a reactor body, a direct-current power supply, a water outlet, sampling openings, a porous baffle plate and a water inlet, wherein the barrel type foaming nickel cathode is arranged inside the reactor body; the center of the barrel type foaming nickel cathode is provided with the graphite anode; the barrel type foaming nickel cathode and the graphite anode are fixed on the reactor body through the porous baffle plate; the direct-current power supply is connected with the barrel type foaming nickel cathode and the graphite anode; the bottom of the reactor body is provided with the water inlet, and the top of the reactor body is provided with the water outlet; and a plurality of sampling openings are arranged on the side wall of the reactor body. The electrochemical autotrophic denitrification integral reactor can effectively remove nitrate pollutant in ground water or surface water, wherein the removal rate of nitrate can reach more than 70 percent and the content of nitrite is below 0.01 milligram per liter, so as to reach the quality standard for drinking water.

The invention relates to a process combination system for integrated treatment of micro-polluted raw water and a method of the process combination system. In a water inlet pre-oxidation area, an ozone adding point is arranged on a water inlet pipe, and after raw water is oxidized by ozone, alga and humic substances are oxidized; in a mechanical clarification area, the raw water is fully mixed by using mechanical stirring, so as to remove suspended matters, colloids and organic substances such as alga out of water; in an aerating biological filter area, alternating down-flow and up-flow biological filters are formed by virtue of a flow guide wall, so as to remove ammonia nitrogen, organic matters, odor, alga, turbidness and falling living bodies out of water; and in a sand filtering area, organic matters, bacteria, even viruses, and heavy metal substances such as iron and manganese in water are removed. The method and equipment for integrated treatment of micro-polluted raw water disclosed by the invention integrate a chemical oxidation method, a biological aeration filter method, a contact oxidation method, a biofilm process, a settling separation method and a rapid filtration method; and the processed water can reach the related national drinking water standards.

A process for removing nitrate from water includes adding carried bimetal catalyst to raw water and continuously introducing H2 in anaerobic condition to reduce the nitrate contained in water into N2. Its reactor has H2 inlet, gas outlet, pH probe, temp probe, acid solution feeding hole, and sampling hole. Its advantage is high effect (more than 99%).

The invention provides an industrial wastewater comprehensive treatment system which comprises a front-end filter unit, a front-end grease collector, a central water treatment device, a back-end COD (chemical oxygen demand) improvement device and a back-end water purifier which are sequentially connected. The invention also provides an industrial wastewater comprehensive treatment technique of the treatment system. The system and technique can extract water in the industrial wastewater and leave over pollutants, so that the treated industrial wastewater can reach the water quality standard for drinking water; and the system adopts the pure physical separation technique, does not need any chemical reagent, can not cause secondary pollution, has low sensitivity for the components of the fluid to be treated, and does not need to greatly adjust the technique and equipment system due to the component difference of the treated fluid.

The invention discloses a fluorine removal agent prepared from fly ash, a fluorine removal method and application of the fluorine removal agent. A certain proportion of iron powder and activated carbon is mixed in solid waste or materials, such as fly ash products and clay containing different active aluminum oxide fluorine removal adsorption materials, iron oxide or hydroxide with the relatively high surface activity is introduced, so that the anion exchange capacity and the fluorine removal adsorption capacity are greatly improved, and the limitation of relatively high cost spent on industrial independent using treatment of the iron oxide is reduced. Compared with a fluorine removal material, the fluorine removal agent has the advantages that the preparation complexity is not improved; the removal efficiency and the preparation cost are both taken into consideration; the fluorine removal process is implemented in multiple ways such as adsorption, complexing, chelating and ion exchange; the fluorine removal agent is simple in process and easy to operate; relevant indexes can meet relevant national water quality standards for drinking water; the fluorine removal agent is particularly applicable to the conventional remediation technology process.

The invention relates to a method for removing perchlorate in drinking water, which belongs to the technical field of water treatment and comprises the following steps that: (1) absorbing agents are added into polluted water containing ClO4<->; (2) the water is added into a stirring device or a shaker for carrying out absorption reaction; and (3) after the absorption is completed, the absorbing agents in the water is stopped for separation treatment. The roasted lamellar metallic oxides can be used for fast and efficiently removing perchlorate ions contained in tap water factory produced water and deionized water containing the perchlorate ions, so the water quality standard of the drinking water is reached, and in addition, the absorbed roasted lamellar compounds can be regenerated.

The invention provides a preparation method for a nutrient slow-release type drinking water purifier. The method comprises the steps: smashing palygorskite clay raw ore and dispersing into citric acid solution, stirring for 12-24 hours, filtering, drying, crushing, adding a plus hole agent, an antibacterial agent and nutrient elements, selenium and zinc, grinding for 0.2-0.5 hour in a high-speed ball mill, granulating in a granulator, rolling into a rotary kiln, and calcining for 0.5-1 hour at 400-500 DEG C to obtain the nutrient slow-release type drinking water purifier. Experiments show that after being treated by the nutrient slow-release type drinking water purifier, the drinking water has the pH value of 7.35-7.45, the potassium ion content is between 0.4 mg / L-0.55 mg / L stably, the zinc ion content is between 0.1 mg / L-0.25 mg / L stably, the iodine content is between 0.02 mg / L-0.1 mg / L stably, the selenium content is between 0.002-0.005 mg / L stably, and water becomes nutritional weak alkaline water, is in full compliance with national GBGB5749-2006 drinking water quality requirements, and also accords with national health drinking water quality standards.

The present invention discloses a recycling treatment method and a device of hyperfiltration backwashing water. The treatment method includes the following steps: a, the membrane backwashing water firstly enters a recycling regulating reservoir; b, the backwashing water discharged in the recycling regulating reservoir is added with 15 to 30 mg / L of coagulant FeCl3 calculated by FeCl3, and then waste water enters a pipeline mixer to mix; c, the yielding water of the pipeline mixer enters a membrane tank of an immersion membrane device after being added with 10 to 30 mg / L of power active carbon; d, the water entering the membrane tank is absorbed by filter pump and the hyperfiltration backwashing water recycling yielding water is acquired by the hydrostatic pressure and the absorbing subpressure of an inner chamber of the membrane permeating the membrane. The recycling method and device of the present invention have the advantages of high recycling efficiency, good water yielding quality, high self control degree and continuous operation of long time and low cost, etc . The quality of the water yielded meets the standard requirements of national drinking water. The present invention has reduced the discharge amount of wastewater.

The invention discloses a method for removing arsenic in water by means of nano hematite.The method is characterized by comprising the steps that limonite ore which is of a vesicular structure is utilized to serve as the raw material, breaking and calcining are conducted, and a nano-structured porous granular material with a hematite crystal structure is obtained; the granular material serves as a filter material to be filled into a filter column or a filter tank, arsenic-containing underground water is treated, and removal of arsenic can be achieved.According to the method for removing arsenic in the water by means of the nano hematite, the nano hematite is utilized to remove arsenic in the water, the content of arsenic ions in effluent can be smaller than 0.01 mg / L, the removal rate is stabilized to be 97% or above, and the water quality of the effluent meets the drinking water quality standard; the nano hematite serving as the filter material can be regenerated and reused, and the cost is significantly reduced.

The invention discloses a three-phase fluidized-bed reactor. The three-phase fluidized-bed reactor solves the technical problems of poor gas-water mixing, difficult operation, undesirable solid-liquid separating effect and high effluent turbidity of an internal circulating three-phase fluidized-bed reactor. The three-phase fluidized-bed reactor comprises a gas-water mixing area, a reacting area, separating area and a filtrating area; the gas-water mixing area is, through a micro-porous gas distributor, communicated with the reacting area which is formed by an outer barrel and an inner barrel; a precipitating area and the filtrating area are formed outside the separating area on the top and communicated with each other through a perforated plate; the filtrating area is provided with a filtering component; and the filtrating component is connected with a water outlet and back wash system which comprises a water pump, a plurality of valves, a plurality of flowmeters and the like. The three-phase fluidized-bed reactor is characterized in that: the gas-water mixing area is shaped as a column; and the filtering component is a film component. The three-phase fluidized-bed reactor is used for treating the domestic sewage and the industrial effluent, so the municipal sewage is recycled to meet the municipal non-drinking water quality standards.

The invention discloses a water-saving ultra / microfiltration purification device for water. The water-saving ultra / microfiltration purification device for water comprises a water-feeding pump 1, ultra / microfiltration membrane purification units 2, an ultra / microfiltration membrane concentrated water and backwashing water recovery tank 3, a clean water reservoir 7, an aeration blower fan 8, a water suction pump 9 and associated pipe valves. The water-saving ultra / microfiltration purification device for water is characterized in that activated carbon particles 4, an aeration device 5 and flat membrane members 6 are arranged in the ultra / microfiltration membrane concentrated water and backwashing water recovery tank 3; the aeration device 5 is located at the bottom of the ultra / microfiltration membrane concentrated water and backwashing water recovery tank 3; and the flat membrane members 6 are located in the ultra / microfiltration membrane concentrated water and backwashing water recovery tank and on the aeration device 5. The water-saving ultra / microfiltration purification device for water can realized purification of water and recovery of concentrated water and backwashing water simultaneously. Product water obtained by the water-saving ultra / microfiltration purification device for water has quality reaching the national drinking water quality standard. Through the water-saving ultra / microfiltration purification device for water, membrane backwashing water and concentrated water can be recycled so that a water recovery rate of a membrane system is greatly improved; a waste water discharge amount is reduced; and a large amount of a water resource is saved. The water-saving ultra / microfiltration purification device for water can be widely utilized for purification of drinking water.

The invention establishes a method of detecting Cd<2+> and Pb<2+> by a nanogold surface-enhanced Raman probe. The method includes using dopamine as a reducing agent in the preparation of nanogold and a SERS signal indicator, adjusting the ratio of chloroauric acid to dopamine in the preparation to obtain gold sols having different morphologies and particle sizes which are used for selective detection of Cd<2+> and Pb<2+>, adding the heavy metal ion to be measured into a detection system to form a heavy metal-gold sol-dopamine complex with the detection system, performing a qualitative detection of the heavy metal ion by means of observing the color change of the sol sample, and performing a quantitative determination of the heavy metal ion by means of observing the intensity change of SERS characteristic peak of dopamine molecule. The method has no need of mark, has simple operation, has a detection limit of [mu]g / L, and can satisfy the requirement of standard for domestic drinking water quality in our country.

The invention discloses an iron and manganese composite oxide arsenic removing material as well as a preparation method and an application method thereof. The arsenic removing material is characterized in that the arsenic removing material is a composite material composed of nano hematite and nano manganese oxide, and is prepared by taking natural iron and manganese oxide ores as raw materials through the steps of crushing, sieving and calcining at 250-550 DEG C; the arsenic removing material has a nano-micron multi-graded pore structure; and the material is used as a filter material and is contained in a filter column or a filter tank and is used for treating arsenic-containing underground water, so that arsenic can be removed. The iron and manganese composite oxide arsenic removing material disclosed by the invention is used for removing the arsenic in the water; the content of arsenic ions in output water can be smaller than 0.01mg / L, the removing rate is stabilized to be more than or equal to 97%, and the water quality of the output water reaches the water quality standards of drinking water; and the nano hematite and nano manganese oxide used as the filter material can be regenerated and repeatedly utilized so that the cost is remarkably reduced.

The invention relates to a sulfide precipitation treatment method of overproof metal contaminant in water, which belongs to the water treatment field. The sulfide precipitation treatment method is characterized in that soluble sulfide is added into water to cause the metal contaminant to generate undissolved sulfide, coagulant is put in again to lead the metal sulfide undissolved substance and aluminum floc to be precipitated; when left sulfide in precipitated output water is over the water quality standard of the drinking water, chlorine or chlorine dioxide is put in for oxidizing and removing the sulfide. The sulfide precipitation treatment method of overproof metal contaminant in water of the invention can treat several-fold to several tenfolds of signal metal contaminant or several metal contaminant occurred simultaneously, the equipment and the operation are simple, the operation cost is not high, the water yield of water works is not influenced, and the application of the water works is convenient, the city water supply can be realized high efficiently, safely, and economically when the metal contaminant in a water source is over the standard, and the method can also be applied to the industrial water treatment.

The invention discloses a defluorination device without concentrated water discharge. The device consists of a defluorination part and an automatic control part. According to the composition structure, a raw water tank is connected to a water inlet pump, an outlet is connected to a water inlet of an electro-adsorption reactor, parallel electrode plates are connected to positive and negative clamping grooves of the electro-adsorption reactor respectively, and the clamping grooves are connected to an electro-adsorption direct-current power supply through wires. The effluent water of the electro-adsorption reactor is connected to the intake water of an effluent water converter, and a purified water outlet of the converter is connected to a water outlet tank. A concentrated outlet of the converter is connected to a water inlet of an electro-flocculation reactor, which is equipped with a stirring area and a precipitation area, the upper part of the precipitation area is equipped with a water outlet, and the lower part is equipped with a sludge outlet. An output signal of a time relay is transmitted to a transition electrode unit to control the running or stop of the effluent water converter, a stirrer and an electro-flocculation direct-current power supply. The device combines electro-adsorption and electro-flocculation technologies, solves the problem of treatment of concentrated water generated in the electro-adsorption regeneration process, has high fluorine ion removal efficiency, and enables effluent water to reach the drinking water quality standard.

The invention discloses a purifying method of removing overproof fluorine of groundwater or surface water in drinking water disposal technical domain, which comprises the following steps: filling modified pure water into adsorb filtering column with grandular activated carbon; forming modified activated char filtrated layer; setting filtrated layer in electric field; leading raw water through this filtrated layer; defluorinationing; purifying. The density of water outlet fluorine <1.0mg / L and all the other index point reach national drinking water standard.

The invention relates to a method for removing haloacetic acids from water. The water containing the haloacetic acids flows through a reduction column / bed and an oxidation column / bed in turn; a filler in the reduction column / bed at least contains zero-valent iron; a filler in the oxidation column / bed at least contains a filler suitable for the growth of a biological film; the shape of the filler containing the zero-valent iron is one or more of a granular shape, a strip shape and a net shape; the filler is one or more of pure iron, cast iron and rusted iron; and the filler suitable for the growth of the biological film is one or more of activated carbon, ceramsite, anthracite, rubber and plastic. By the method, the treated water can meet the requirement of the drinking water quality standard on the concentration of the haloacetic acids; and the method has the characteristics of simplicity, reliability and high efficiency.

The invention relates to a method for removing trace antimony in water, aiming at solving the problems that the existing method for removing the trace antimony in the water mainly aims at high-concentration antimony-containing waste water, so that mature technology and process are not available for removing the trace antimony in the domestic drinking water, and the treated water can not easily reach the domestic drinking water quality standard requirements in China; the engineering nano material is difficult to recover and separate after being used for removing the heavy metal in the water. The method comprises the steps of feeding ferrate into the water containing the trace antimony, carrying out reaction, and stirring for absorption; then, feeding a coagulant; finally, sequentially coagulating, precipitating and filtering to remove the trace antimony in the water. The method has the antimony removal rate reaching up to more than 91%, is simple in technological process and low in operation cost, and is capable of effectively removing the antimony; after the method is adopted, the drinking water reaches the hygienic standard for domestic drinking water, namely, the content of the antimony is lower than 5mu g / L. The method provided by the invention is the method for removing the trace antimony in the water.

The present application discloses a method used for separating and / or extracting radioactive metal cations. The method is characterized in that an ion exchange agent is put into a liquid containing the radioactive metal cations, contact is performed for not less than 5 min at 20-80 DEG C, and therefore the radioactive metal cations are captured and separated by the ion exchange agent. The method provided by the invention has the advantages of a high speed of capturing the radioactive ions, a high adsorption amount, high selectivity, excellent resistance to beta and gamma ray irradiation, a high removal rate and a low residual amount when the radioactive metal cations are removed, and the residual amount reaches the world health organization (WHO) standard for drinking water quality; and the radioactive metal cations in a [Sn3S7]n<2n-> two-dimensional framework material can be eluted by a simple, inexpensive and environmentally-friendly method, and the method has important meaning for high-efficiency removal and recycle of the radioactive metal cations in the water environment.

The invention provides a drinking water disinfectant after the earthquake, which comprises a flocculating agent and a disinfectant, and mainly consists of alchlor and calcium hypochlorite, and is an ideal drinking water disinfectant after the earthquake. The invention can not harm the health of the human body during the production and use processes of the drinking water disinfectant after the earthquake, does not contain carcinogen ingredients which are environmentally prohibited to use, does not contain other pollution ingredients, can make the water quality reach the drinking water quality standards, and solves the problem of domestic water using by people in disaster areas in a short period after the earthquake. The invention has the characteristics of simple method, low cost price, strong maneuverability and easy implementation, and can realize good economic and social benefits.

The utility model relates to a method for using iron shavings and manganese sand to eliminate trichloroacetic acids. In the method, the cleaning fluid is used to eliminate the oil on the iron shavings formed in the process of processing the steel and the dilute sulfuric acid is used to eliminate the rust of the iron shavings and wash and break up the iron shavings, which are used to reduce and remove the trichloroacetic acid in the drinking water. The time which the water containing the trichloroacetic acids contacts with the iron shavings for is controlled till most of the trichloroacetic acids are removed. The manganese sand filtration method or the filtration method of combining the manganese sand with the particle activated carbon is adopted to control the content and chromaticity of the iron in the water. The method can be operated simply, delivers low cost and allow high speed, and the consistency of the trichloroacetic acids in the water can be effectively lowered and simultaneously each index can meet the standards of the water quality of the water for drinking and living of our country.

The invention discloses a method for recovering and treating ultrafiltration backwash water. The treatment method comprises the following steps: a. The membrane backwash water first enters a recovery adjustment tank; b. Dosing FeCl3 in the backwash water discharged from the recovery adjustment tank The coagulant FeCl3 is calculated as 15-30mg / L, and then the wastewater enters the pipeline mixer for mixing; c. The effluent of the pipeline mixer enters the membrane tank of the submerged membrane device after adding 10-30mg / L powdered activated carbon; d. The water entering the membrane tank is sucked by the filter pump, and the hydrostatic pressure and the suction negative pressure of the inner chamber of the membrane are used to pass through the membrane to obtain ultrafiltration backwash water and recover the effluent. The recovery method and device of the present invention have the advantages of high recovery efficiency, good effluent quality, high degree of self-control, long-term low-cost continuous operation, etc., and the effluent quality meets the requirements of the national drinking water quality standard, reducing the discharge of waste water.

The invention discloses a membrane process drinking water treatment system and method. The system comprises a primary settling tank, a self-cleaning filter device, an immersed ultrafiltration device and an ultralow pressure reverse osmosis device connected successively, wherein the primary settling tank is provided with a water inlet for introducing incoming water, and the ultralow pressure reverse osmosis device is provided with a water outlet for discharging produced water. The treatment system forms two-stage membrane treatment, can realize a novel membrane treatment process on the incomingwater by the two-stage membranes, and ensures that the effluent quality reaches the water quality standard of domestic drinking water stably. Ultrafiltration and reverse osmosis are in low pressure operating modes. Compared with a conventional membrane treatment process, the system has the advantages that the operating energy consumption is reduced greatly.

The invention discloses a clean water electric water heater, which comprises a casing, an inner container, a heat preservation layer, a water heater inlet pipe, a water heater outlet pipe, and a first filter cartridge, on which a filter cartridge water inlet and a filter cartridge water outlet are arranged. , the sewage outlet, and the outlet of the filter cartridge are connected to the water heater inlet pipe, and the water heater inlet pipe is provided with a one-way valve for preventing the hot water in the inner tank of the water heater from flowing back into the filter cartridge, and a plurality of hollow fiber membranes are arranged in the first filter cartridge The silk tube, the water inlet of the filter cartridge, and the water outlet of the filter cartridge are arranged at both ends of the filter cartridge along the axial direction of the hollow fiber filter tube. microporous. The present invention endows the water heater with the function of purifying water quality on the basis of the existing water storage type electric water heater. The hollow fiber filter membrane silk tube can isolate bacteria and microorganisms in the water, and output purified water that meets drinking water quality standards without additional purchases. Drinking water equipment.

The invention relates to a polluted underground water deep purification combined denitrification system, which comprises an aeration biological fluidized tank, primary subsurface flow wetland and secondary primary subsurface flow wetland in sequential connection. The invention also provides a method adopting the system for purifying the water quality. According to the method, a lifting pump is used for lifting polluted underground water to the aeration biological fluidized tank, most ammonia nitrogen in the polluted water is directly oxidized into nitrate nitrogen under the effect of nitrifiers, sewage enters the primary subsurface flow wetland, the rest ammonia nitrogen is further oxidized into nitrate nitrogen under the aerobic condition, then, the sewage enters the secondary subsurface flow wetland to complete the denitrification effect under the anaerobic conditions, and the nitrate nitrogen is reduced into nitrogen gas. The system aims at the water quality characteristic of high organic matter and ammonia nitrogen content in underground water polluted by landfill leachate, an aeration biological fluidized tank is combined with the constructed wetland technology, the ammonia nitrogen removal rate reaches higher than 99 percent after the purification, the water outlet concentration of nitrate is smaller than 5mg / L, and the ammonia nitrogen and nitrate concentration of the polluted underground water after the treatment completely meets the water quality standard of drinking water.

Provided is a one-body domestic-sewage treatment system for treating sewage in daily life. The system comprises: a biological treatment apparatus including an anoxic pool, an aerobic pool and a sedimentation pool which closely abut against each other, wherein one overflow orifice is arranged between the anoxic pool and the aerobic pool, the other overflow orifice is arranged between the aerobic pool and the sedimentation pool; and a membrane treatment apparatus including a membrane treatment pool of original water, a membrane treatment assembly and a water producing pool. The combination of biological treatment with membrane treatment is adopted in the invention, so that excurrent water can reach a water quality standard of drinking water. Apparatuses in the invention combined with each other closely can be integrated in a container and loaded on a trailer to move instantly, so transport and installation of the system are convenient. Sewage can be treated conveniently in areas which are remote, far away from a sewage drain pipeline network of the city and not suitable for building a sewage treatment factory. In particular, the system in the invention is suitable for treating domestic sewage in tourism areas, scenic spots, villa quarters, resorts, sanatoriums, armies, countrysides, desert areas, wellsites, etc.