105 results about "Anaerobic filter" patented technology

The invention discloses an integrated up-flow reactor and an advanced treatment method of fermentation industrial effluent, belonging to effluent treatment field. The upper part of the reactor is an aerobic fluidized bed system, the lower part is an anaerobic filter system, the intermediate transition zone is designed to be a connecting part which has a tri-phase separation function and organically combines the upper part and the lower part together. In the reactor, the concentration of biological solid is high and the retention time of biological solid is long, therefore the reactor is suitable for treating secondary biochemical treatment effluent of fermentation industrial effluent which has high salinity and is difficult to be biodegraded; sludge output of each system is low, and the residual sludge generated in the aerobic zone enters to the transition zone and the anaerobic zone to be further treated, the overall sludge output of the reactor is low, and simultaneously, the reactor contains rich biological species which act on organics difficult to be degraded jointly and promote the degradation thereof. The integrated reactor has low energy consumption, less land occupation, convenient operation, load impact resistance and high treatment efficiency, thereby being applicable to the advanced treatment of fermentation industrial effluent.

The invention relates to a deep treatment process of landfill leachate. The effluent of landfill leachate subjected to biochemical treatment is used as influent. The process adopts a coagulative precipitation tank, an oxidation tank, an anaerobic biological filter and a membrane treatment device and comprises the following steps of: (1) removing partial organic matter through coagulative precipitation to reduce chroma; (2) further removing refractory and non-biochemical organic matter with an oxidizer formed by ozone, and the like and improving the biodegradability of the effluent; (3) removing SS (Suspended Solid), organic matter and nitrate in the leachate through an anaerobic filter; and (4) ensuring that the effluent stability of the whole system through a membrane separation technology reaches the emission standard and canbe recyclable. The process has the advantages of lower operation cost, stable effluent, less quantity of generated concentrated liquid, less salt content in theconcentrated liquid, and the like, and the process of biochemistry and materialization of the pretreatment, which is used before using the membrane method, can prolong the service life of the membrane.

The invention relates to a municipal wastewater treatment system (STAR) for forming a wastewater treatment plant (PTAR), characterized by the functional and structural relationship between the components thereof. The invention comprises seven treatment stages in the STAR and the arrangement thereof, including: an intake regulator box having a discharge outlet; a pretreatment stage consisting of solid separation screens and grit channels; and anaerobic biodigester; an up-flow anaerobic filter; drying beds; subsurface flow constructed wetlands; and a chlorine contact channel. The STAR and PTAR according to the invention are suitable for use in a single home, as well as for use by communities of approximately 5,000 (thousand) inhabitants, and their capacity can be increased to the extent that new elements are provided at each of the different steps, simply by adding and adapting modules, without having to replace the already operating elements.

The invention discloses a process for purifying and recycling biomass organic wastewater and belongs to the technical field of treatment and recycle of wastewater. The process comprises the following steps: (A) carrying out hydrolysis acidification, i.e. carrying out hydrolysis acidification treatment on the biomass organic wastewater for 2.5 to 5 hours; (B) carrying out anaerobic treatment, i.e. adopting an anaerobic composite reactor the level of which is over three, wherein the inside of the anaerobic composite reactor is provided with a combination body of an upflow anaerobic activated sludge bed and an anaerobic filtering media and filler biological film bed and is also provided with a bionic distributor; (C) carrying out aerobic contact, i.e. adopting an aerobic tank which is internally provided with a combination band of an aerobic filler biological film and aerobic activated sludge so as to purify the wastewater, or carrying out wetland treatment or land treatment, i.e. purifying the wastewater by the physics, materialization, chemistry and biochemistry (anaerobic, facultative and aerobic bacteria, microorganism, animals and plants) composite actions which the wetlands or the lands have. The process of the invention has the advantages of wide application range, small energy consumption, little equipment, low price, simple management, easy operating control and smelling and tasting control, simple and clear scheme design and easy construction and installation and is suitable to carry out treatment and recycle on the wastewater in rural areas and the organic wastewater generated by enterprises using animals and plants as raw materials.

The invention relates to a biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage. Sewage passes through a grating and a primary settling tank at first so that partial suspended solids are removed, next, the sewage passes through an anaerobic filter tank loaded with iron carbon filler and an aerobic filter tank, the effluent of the aerobic filter tank flows back to the anaerobic filter tank, organic matters in the sewage in the anaerobic state are acidified so that the pH is reduced, an electrochemical reaction is aroused on the surface layer of the iron carbon filler to intensify denitrification, and in the meantime, few ferrous ions (Fe<2+>) are dissolved out; the ferrous ions (Fe<2+>) are oxidized into ferric ions (Fe<3+>) in the aerobic state, the ferric ions react with soluble phosphate radicals in the sewage to generate precipitate, and finally, the sewage enters a sedimentation basin and is gravitationally settled, and then emitted. The biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage, provided by the invention, has the advantages that no reagent needs to be fed independently to remove phosphorus, and only by virtue of the biochemical method, the COD (Chemical Oxygen Demand) in the yielding water is lower than 30 mg/L, TN (Total Nitrogen) in the yielding water is 1.5 mg/L and TP (Total Phosphorus) in the yielding water is 0.2 mg/L, and consequently, the yielding water is up to the class IV water standards of surface water. Furthermore, the biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage is simple in process, and capable of saving investment and operation costs, and thus has a great application value.

The invention discloses an irrigated area domestic wastewater activated iron-anaerobe coupling strengthening and nitrogen and phosphorus removal device. An anaerobic filter bed tank, an activated iron-anaerobe coupling reaction tank, a contact aeration tank, a settling tank, a disinfection tank, an aeration device and a backwashing device are sequentially arranged through partition boards; a water inlet pipe is communicated with the anaerobic filter bed tank; the anaerobic filter bed tank returns water and then is communicated with the activated iron-anaerobe coupling reaction tank; the activated iron-anaerobe coupling reaction tank returns water and then is communicated with the contact aeration tank; the contact aeration tank returns water and then is communicated with the settling tank; the settling tank is communicated with the disinfection tank; the disinfection tank is communicated with a water outlet pipe; the aeration device is arranged at the bottom of the contact aeration tank; a backflow device and the backwashing device are arranged between the contact aeration tank and the activated iron-anaerobe coupling reaction tank. The irrigated area domestic wastewater activated iron-anaerobe coupling strengthening and nitrogen and phosphorus removal device has the advantages of being compact and simple in overall structure, easy to install, manufacture and use, and low in cost; a self-burial mode is adopted, the ground space is not occupied, and the device is suitable for treatment of rural scattered domestic wastewater; the nitrogen and phosphorus removal and purification effects are remarkable.

The invention provides a biological nitrogen removing method of A/O/A branched direct flow for treating coking wastewater, belonging to the technical field of environmental engineering. The biological nitrogen removing method mainly comprises: the pretreated coking wastewater entering a preposed anaerobic filter tank and proportionally distributing the water outlet by a water distributor, wherein a large amount of water enters an aeration tank for aerobic treatment and a little of water enters a carbon source supplementary dispenser for dispensing treatment, after filtering the water entering the aeration tank by a filter membrane assembly arranged in the aeration tank, pumping out the aerobic-treated water to enter an anoxybiotic filter tank, simultaneously receiving the little water from the water distributor by a carbon source dispenser and additionally dispensing and modifying depending on the carbon-nitrogen condition, wherein the little water is merged with the discharged water which is aerobic-treated in the aeration tank to enter the anoxybiotic filter tank for nitrogen removing treatment by denitrification. Compared with the prior art, the invention has the advantages of simplified operation, reduced cost and largely reduced floor space and energy consumption.

The invention discloses a composite anaerobic-aerobic process for treating waste paper making wastewater. The method comprises that: the waste paper making wastewater enters a physicochemical treatment unit, and fibers are recycled; and the water yielded from the physicochemical treatment unit is distributed through an air pipe water distributor at the bottom of a composite anaerobic pool, pollutants are removed by anaerobic granular sludge formed by an active sludge layer at the lower part of the composite anaerobic pool, then the wastewater enters an anaerobic filter layer at the upper part of the composite anaerobic pool and is subjected to decomposition and metabolism by using microbes attached and grown on the surface of a filter material and inside pores, the top of the composite anaerobic pool yields water to an aerobic pool, the water yielded from the aerobic pool enters a sedimentation pool, the sludge and the water are separated, and the supernatant fluid water can be directly discharged and also can be recycled for paper making. By using the anaerobic granular sludge to adsorb small fibers, the method reduces balling of the filter material of the anaerobic filter pool, improves the integral effect of anaerobic treatment, and achieves the aims of steady operation of sewage treatment facilities and reduction of operating cost of sewage treatment.

The invention relates to a marsh gas generating device, belonging to the biomass energy utilizing and processing equipment, which is characterized in that: a liquid feed delivery pipe is arranged between the discharging opening of the down-flow anaerobic filer and the feeding opening of the up-flow anaerobic fermentation cylinder, the valve of the discharging opening, the liquid feed transferring pump and the valve of the feeding opening are arranged on the liquid feed delivery pipe, both ends of the circulating reflux pipe assembled with the valve at the feedback hole and the valve at the feeding opening of the reflux pipe are respectively connected with the feedback hole at the upper part of the down-flow anaerobic filter and the liquid feed delivery pipe, the upper side end, the lower side end and the bottom end of the discharging reflux pipe of the fermentation cylinder are communicated with the up-discharging opening on the up-flow anaerobic fermentation cylinder, the down-discharging opening and the liquid feed delivery pipe, and the discharging reflux pipe of the fermentation cylinder is provided with a valve. The marsh gas generating device has the advantages of simple structure, fast anaerobic fermentation, high gas generating speed, full fermentation of the liquid feed and convenient operation.

The invention discloses a high-concentration organic wastewater treatment method and equipment special for the same. The wastewater treatment method includes: adjusting pH of organic wastewater to be treated to acidic; subjecting the organic wastewater sequentially to microelectrolysis treatment, Fenton reagent treatment, flocculation precipitation, anaerobic biological treatment and aerobic biological treatment; subjecting treated wastewater to coagulating precipitation, and discharging supernatant, wherein a regularized Fe/Al/C multi-element microelectrolysis filler is adopted in the microelectrolysis treatment process. The equipment comprises a pH adjusting tank, a microelectrolysis reactor, a Fenton reactor, a flocculation precipitation tank, an anaerobic filter column, an aerobic filter column and a secondary precipitation tank which are connected sequentially, and further comprises a reagent adding system adding a pH adjuster and hydrogen peroxide respectively into the pH adjusting tank and the Fenton reactor, and the microelectrolysis reactor is filled with the regularized Fe/Al/C multi-element microelectrolysis filler. By adopting the wastewater treatment method and the equipment, biodegradability of the wastewater can be improved greatly, and quality of outgoing water can be improved remarkably.

The present invention relates to a method for deamination and denitrification of residential quarter sewage, belonging to the field of sewage treatment technology. It is characterized by that after the sewage is passed through anaerobic filter tank, contact oxidation tank and precipitation tank to obtain treatment, then sewage can upwards flow and be fed into two parallel modified zeolite adsorption regeneration columns to implement ammonia and nitrogen adsorption at twice successively, so that said invention can obtain high ammonia and nitrogen treatment efficiency. Said invention also provides the regeneration method of the above-mentioned zeolite adsorption regeneration column by using backflush process.

A water recycling device in artificial wetland organic industrial water with high concentration comprises a grit settling tank, a grid, a collected water neutralization tank, an immersible stirrer, a first-stage sewage pump, a hydrolysis equalizing tank, a second-stage sewage pump, a UASB reactor, a three-phase separator, a water distributor, an anaerobic filter chamber, anaerobic filler, a blower, aerobic filler, an aerator, a biological contact oxidation tank, a secondary settlement tank, a travelling type sludge scraping machine, a sledge tank, a sledge pump, a sledge condensed tank, an underflow pump, a belt type filter press, electrolytic filler, a sterilizing tank, a chlorine adding pump, a chlorine adding device, a chlorine dioxide generator, a monitor and an artificial wetland. The invention can be widely applied in water recycling systems in different organic waste water with high concentration, and has the characteristics of less investment, stable operation, resource utilization, low operation cost and the like.

The invention relates to a biological filter-ceramic membrane biological reactor device, which comprises a water feeding pump, an anaerobic biological filter reactor and a ceramic membrane aerobic membrane biological reactor, the water feeding pump is connected with the water inlet of the anaerobic biological filter reactor by a pipeline, while the water outlet of the anaerobic biological filter reactor is connected with the water inlet of the ceramic membrane aerobic membrane biological reactor; the invention further discloses a water purifying application method thereof: contaminated surface water enters in the anaerobic filter reactor, biochemical reaction is carried out under anaerobic conditions; then the treatment liquid in the anaerobic biological filter reactor flows automatically into the biological unit of the ceramic membrane aerobic membrane biological reactor for carrying out aerobic biochemical reaction; then, the treatment liquid flows into the membrane unit in the ceramic membrane aerobic membrane biological reactor in an overflowing way, water flow enters a clean water pool after membrane separation function of the ceramic membrane component is carried out under the action of a vacuum suction pump; part of the treating liquid flows back into the anaerobic biological filter reactor from the ceramic membrane aerobic membrane biological reactor for carrying out denitrification reaction, and the reflux ratio is 0.5-2:1.

The invention relates to an integrated device and an integrated method for enhancing the denitrification and dephosphorization of dispersed village and town sewage. A water inlet (13) and a water outlet (6) of the device are positioned at the bottom of the left side and on the upper part of the right side of a device main body (1) respectively; a perforated clapboard (4) divides the device main body (1) into seven areas, namely an anaerobic filter area (A), an anaerobic filter area (B), a composite area (C), a contact oxidation area (D), a contact oxidation area (E), a contact oxidation area (F) and a water outlet area (G) in turn; the composite area (C) is divided into two chambers with the same volume through a nonporous clapboard (25), a closed clapboard (27) and a porous clapboard (26); ceramsite (2) serving as a filler is arranged in the anaerobic filter area (A), the anaerobic filter area (B) and an anaerobic filter area (H); hollow spheres (3) and a system are arranged; and both bottoms of the anaerobic filter area (A) and the contact oxidation area (F) are provided with a nitration solution refluxing port (10). The device and the method are easy and convenient to operate, sanitary, and low in consumption and have impact load resistance.

The invention discloses a biomass filler anaerobic filter tank for treating oxidation-state pollutants. The biomass filler anaerobic filter tank for treating the oxidation-state pollutants comprises a biological filter tank and a biomass filling material. A water inlet buffer zone, a filter tank filtering region and a water outlet buffer zone are sequentially arranged inside the biological filter tank in the water inflow direction, the filter tank filtering region comprises a first filtering layer, a second filtering layer, a third filtering layer and a fourth filtering layer, of which the heights account for 20 percent, 50 percent, 20 percent and 10 percent of that of the filtering region; all filtering layers are respectively filled with the biomass filling material with different raw material ratios, the biomass filling material is composed of an impatiens balsamina plant biomass material and an inactive filler, wherein the volume content of the impatiens balsamina plant biomass material is lowered in the water flow direction in the biological filter tank, and are respectively 20-50 percent, 10-30 percent, 5-15 percent and 0 percent. The biomass filler anaerobic filter tank provided by the invention has the advantages of simplicity in operation, high efficiency, lower running cost, zero secondary pollution and the like, and can also achieve the purposes of synchronous reduction and treatment of wastes with processes of wastes against one another of the natural plant biomass.

The present invention relates to a biochemical treatment reactor for waste water containing quinolone antibiotics, the reactor is composed of CAF (Composite Anaerobic Filter) and FBBR (Fixed Bed Membrane Bioreactor). Such pollutants are decomposed into small molecular compounds, and then degraded by microorganisms in the aerobic reactor, so as to achieve the purpose of removing such pollutants. By improving the traditional reactor, the present invention not only solves the problem that antibiotic wastewater containing quinolone compounds is difficult to biodegrade, but also solves the problem of mud run-off and difficult acclimation in traditional reactors, and opens up a new path for the treatment of this type of antibiotic wastewater new way.

The invention discloses an anaerobic treatment process for high-concentration kitchen waste, which mainly includes that kitchen waste is subjected to solid and liquid separation, waste liquid enters an oil separator, waste oil is used for producing biodiesel, water phase is subjected to the subsequent treatment in an A2/O process, after being subjected to metal impurity separation, solid-phase kitchen waste is crushed by a machine, then sent to an anaerobic digester to be mixed with returned sludge in a flotation tank and a secondary sedimentation tank so as to realize anaerobic digestion, and biogas generated from anaerobic digestion is used as an energy source after being desulfurized; digested slurry spills to enter the flotation tank; digested sludge is discharged intermittently at a fixed period and digested liquid is subjected to the A2/O process; the sludge on the upper layer of the floatation tank returns to the anaerobic digester, clean water phase is subjected to the A2/O process at the water treatment working section, outflow water enters the secondary sedimentation tank, the sludge is concentrated until the solid content thereof reaches 2%-3%, then returns to the anaerobic digester, and cleared water spills and is drained outwards. By the anaerobic treatment process for high-concentration kitchen waste, ammonia nitrogen, salt and grease loads entering the anaerobic digester can be reduced, failure of the anaerobic digester can be avoided, stability and continuity of the anaerobic process are improved, and expenses for sludge transportation and landfill disposal are decreased.

The invention belongs to the technical field of sewage treatment in environmental engineering, and particularly relates to a method for sewage treatment in a compound tower-type ecological filtering pool. The method disclosed by the invention comprises the following steps of: collecting the domestic sewage of residents by a sewage tube network, removing suspended substances in the sewage via thick and thin grids, and pre-treating the sewage; pumping the sewage in the compound tower-type ecological filtering pool formed by connecting a one-stage high-level water distribution anaerobic filtering pool and a multi-stage earthworm trickling filtering pool in series via a sewage pump; automatically flowing, collecting and distributing the sewage via the action of gravity; and achieving the purpose of purifying the sewage via the synergistic effect of microorganisms, filter material, animals (earthworms) and plants in the filtering pool. The method for sewage treatment in a compound tower-type ecological filtering pool disclosed by the invention combines with traditional sewage treatment process and land treatment method, has the advantages of being good in water yielding effect, simple in operation and management, small in floor area, low in construction cost and the like, and has good economic effects and environmental benefits.

The invention relates to a rural domestic wastewater treatment device. The rural domestic wastewater treatment device comprises an oxygen elimination tank, an anaerobic filter, an aerobic MBBR pond and a biofilter which are sequentially communicated, wherein the biofilter is aimultaneously communicated with the oxygen elimination tank; each area is divided by partitions into a plurality of reaction tanks which are different in size and mutually communicated, and the sizes and the numbers of the reaction tanks are determined according to actual cases to meet requirements of different wastewaterqualities. An oxygen elimination filler, an anaerobic filter filler, an MBBR active biological filler or a filter filler is not arranged in the oxygen elimination tank, the anaerobic filter, the aerobic MBBR pond and the biofilter, or the oxygen elimination filler, the anaerobic filter filler, the MBBR active biological filler and the filter filler are respectively arranged in the oxygen elimination tank, the anaerobic filter, the aerobic MBBR pond and the biofilter, to meet the requirements of the different wastewater qualities. Defects in the prior art are avoided. The microbial biomass andthe microbial population in a reactor are greatly increased to radically degrade and remove various pollutants in wastewater, thereby providing a powerful guarantee for stable and standard effluent discharge. Meanwhile, the sludge yield and the occupied area are reduced and the building investment and the running investment are lowered on the premise of guaranteeing the effluent quality and amount.

The object of the present invention is to provide a water treatment device in which temperature does not affect performance in nitrogen removal. Water circulates in a first anaerobic filter bed chamber 5, a second anaerobic filter bed chamber 10, a contact aeration chamber 14, a sedimentation chamber 19, and an electrolytic chamber 59 for phosphorus removal. The supernatant in sedimentation chamber 19 flows into a disinfection chamber 21 and is then sent to an electrolytic chamber 100 for nitrogen removal. An electrode pair is provided inside electrolytic chamber 100. Halogen ions present in the water are oxidized on the anode side. After halogen gas is generated, this gas reacts with water and generates hypohalous acid. On the cathode side, the nitrogen components in the water are converted to nitrate ions, and these nitrate ions are further converted to ammonium ions. The hypohalous acid and ammonium ions react, and the nitrogen components are converted to nitrogen gas by way of chloramine.

The invention discloses an integrated treatment process for ramie degumming wastewater and a device thereof. The process comprises a regulating pre-precipitation step, an iron-copper reduction step, an anaerobic treatment step, an aerobic treatment step, a deaeration treatment step and a clarification step. The device comprises a casing, wherein the casing is internally equipped with an anaerobic treatment device and an aerobic treatment device which are mutually communicated, two sides of the casing are provided with a water inlet pipe and a water outlet pipe, a deaeration water inlet device and a clarification device are sequentially communicated between the aerobic treatment device and the water outlet pipe, and the clarification device is communicated with the water outlet pipe. The anaerobic treatment device comprises an iron-copper reduction bed and a baffled anaerobic filter bed which are mutually communicated. The aerobic treatment device comprises an aeration tank, and the bottom portion of the aeration tank is provided with an aerator. The clarification device is internally provided with a macroporous packed bed which is filled with fillings. The integrated treatment process for ramie degumming wastewater and the device treat the discharged water which can meet national discharge standard of class I of integrated wastewater discharge standard, with perfect integration, and the device can be combined to be an integral device with low investment and operation costs and high treatment efficiency.

The invention relates to a device and a method for ecological treatment of private household type domestic drainage. The device consists of an anaerobic filtering tank, a water diffusion aerobic tank and a functional porcelain granule underground infiltration bed in serial connection. The detailed device structure and the method are shown as an instruction book. The device and the method have the advantages that mass solid is intercepted through anaerobic filtering; activity of microorganism is increased through water diffusion and oxygen increase; an infiltration layer consisting of functional porcelain granules and zeolite filled through 'wall-bricking' nesting and filling is introduced to an underground infiltration gravity filtering section so that an underground infiltration system has good hydraulic conduction performance, high-efficiency self-desorption capacity, high hydraulic load, remarkable chromatographic effect of pollutants and uneasy blockage; a material for producing the functional porcelain granules has wide source, convenient machining and low cost; a water distribution mode of capillary adsorption increases a sewage purification path in the system and improves effective cubage of the system; and the device operates under powerless condition, does not increase building cost and is in particular suitable for deep treatment of villa and private household type domestic drainage.

The invention discloses a micro-electrolysis treatment process for furfural wastewater. The process mainly comprises three steps of wastewater pretreatment, biochemical treatment and sludge treatment,namely performing adjustment treatment on wastewater before UASB+AF (Upflow Anaerobic Sludge Blanket+Anaerobic Filter) anaerobic treatment and biological contact oxidation method treatment, homogenizing water quality, reducing the water temperature, improving decomposition of organic matters which are refractory in biochemical degradation according to micro-electrolysis principles so as to greatly improve biodegradability, and performing chemical coagulation procedures, thereby effectively reducing COD (Chemical Oxygen Demand) loads, increasing the pH value of wastewater and providing convenience conditions for later biochemical treatment. The treatment process disclosed by the invention has the advantages of being high in treatment efficiency and stable in effect.

This invention provides a fiber filter and a sewage purifier capable of realizing effective use of the capacity of a treatment tank and being easily manufactured. A fiber filter is formed in a manner that ends of a plurality of fibrous materials made of carbon fibers bundled into a fiber bundle are connected to each other at a fixation part. The fiber filter is used as a filter of an anaerobic filter-bed tank of a sewage purifier. A part, which is not fixed at the fixation part, of the fibrous materials of the fiber filter spreads and develops in a tuft shape in sewage. Thus, the surface area of the fiber filter can be increased. Capacity necessary for treatment of the sewage W can be reduced and effectively used. The fiber filter can be easily manufactured due to its simple constitution.

The invention discloses a domestic wastewater purifying treatment technology. The technology includes the following specific steps that domestic wastewater passes through an impurity removing tank, and domestic impurities are intercepted; the wastewater obtained after interception is conducted enters an anaerobic filter bed tank to be subjected to anaerobic fermentation; the wastewater obtained after anaerobic fermentation enters a packing flowing tank to be subjected to aeration fermentation; the wastewater obtained after aeration fermentation enters a settling pond to be settled, after settling is conducted, upper clean liquid is disinfected through a disinfecting tank to be discharged and recycled, and the lower sediment part flows back to the impurity removing tank through a water pump in an aeration stirring state to be circularly treated. The technology is simple and suitable for miniaturized and domestic use. The domestic waste water is purified through the impurity removing tank, the anaerobic filter bed tank, the packing flowing tank and the settling tank in sequence, miniaturization and domestication of domestic wastewater treatment are achieved, the treatment efficiency of the domestic wastewater is improved, the removing efficiency of BOD, SS and ammonia nitrogen is high, and the burden of large-size concentrated wastewater treatment of the domestic wastewater is reduced.