50results about How to "Increase nitrification" patented technology

The invention discloses a multi-level biological nitrogen and phosphorus removal sewage treatment method. The method comprises the following steps of: introducing sewage into an anaerobic pond; introducing the sewage treated in the anaerobic pond into an anoxic pond at the front section of an anoxic-aerobic treatment unit; draining all sewage into a settling pond through an aerobic pond of the last level; draining the settled sludge into a returned sludge concentration pond; draining supernatant in the returned sludge concentration pond into the aerobic pond of the last level; and draining the sludge in the returned sludge concentration pond into the initial anaerobic pond through a pre-anoxic pond for circular treatment. The invention also provides a corresponding treatment device. The method and the device have the advantages of only adding the returned sludge concentration pond and the pre-anoxic pond compared with the A2O process in the prior art and improving the reaction efficiency by adjusting the connection relationship among the reaction ponds.

The invention relates to a method for processing reverse osmosis concentrated water by a catalyzed internal electrolysis and modified biological aerated filter. The method comprises the following steps: 1) performing catalyzed internal electrolysis pre-processing: regulating a pH value of wastewater, and removing organic substances in concentrated water through iron-carbon internal electrolysis reaction; 2) performing two-stage biological filter biological membrane processing: after performing coagulating sedimentation on catalyzed internal electrolysis outlet water, introducing the catalyzed internal electrolysis outlet water into a two-stage biological filter (a denitrification biological filter and an aeration biological filter) to further remove organic substances and ammonia nitrogen in the concentrated water. The method is high in processing efficiency, low in operation cost and capable of effectively removing organic substances which have toxic action to human health and an ecological environment in the concentrated water and improving wastewater biodegradability; the improved aeration biological filter can be suitable for characteristics of high hardness, high alkalinity, high sulfate and the like of the RO concentrated water, so that the water quality of the outlet water meets emission needs and a novel way for processing the reverse osmosis concentrated water is provided.

The invention relates to a river channel ecological construction and a water body restoring system, which are used for treating the river channel environment. A equipment house is provided with a microbial strains box, a bio fungus transfer pump and an oxygen supply blower; the bio fungus transfer pump is respectively connected with the microbial strains box and a bio fungus box through the bio fungus conveying pipelines, the bio fungus box is placed in the river channel; the oxygen supply blower is respectively connected with the microbial strains box, the bio fungus box and an air pipeline through pipelines, a diaphragm aerator pipe is provided on the air pipeline through a connector for branch pipes, the air pipeline and the diaphragm aerator pipe are placed in the river channel; bio fungus filling materials are provided in the river channel. The invention employs a proper aeration system for reoxygenation to water body of the river channel, further the beneficial bacteria groups can be added, the invention is capable of biologically restoring polluted river water, effectively treating the black color and odor smell of the river channel, accelerating recovery of natural ecologyof the river channel and the processes of nitrification and nitrogen removal to the polluted water quality, inhibiting the generation of green alga, rapidly eliminating the various odor smell generated by the contaminated water quality, so that the river channel ecological construction and the water body restoring system have the advantages of obvious effects of saving energy consumption and highefficiency for treating pollution.

The invention discloses a device for treating sewage by using a biological rotating disc. The device mainly comprises four parts, namely a centrifugal machine, the biological rotating disc, a turbulent flow nano aeration recoil screening pool and a nano aeration ablation device. The invention also discloses a method for treating the sewage by utilizing the device. The device has the advantages of simple structure, safety in operation, good treatment effect, convenience in maintenance and management, low operating cost and the like, is particularly suitable for small-water-volume low-concentration wastewater treatment, is obvious in effect of dispersed and contaminated high-load-fluctuation water, does not cause membrane drop and is obvious in sterilization and disinfection effects, and the removal rate can exceed 96 percent aiming at the condition that trace pollutants are difficultly treated.

The invention provides a method for treating chitin waste water, wherein the method comprises the following steps of: (1) conveying soda boiling water and pickling waste water into a first-level coagulation tank for first-level coagulation sedimentation; (2) conveying yielding water of the step (1) and washing waste water into a regulating tank; (3) conveying the yielding water in the regulating tank into a second-level coagulation air floatation tank; (4) conveying the yielding water of the step (3) into an up-flow anaerobic sludge blanket; (5) conveying the yielding water of the step (4) into a hydrolysis acidification tank, and carrying out hydrolysis acidification; (6) conveying the yielding water in the hydrolysis acidification tank into a contact oxidization tank; (7) carrying out partial reflux of the yielding water in the contact oxidization tank to the hydrolysis acidification tank; and (8) conveying the residual yielding water in the contact oxidization tank into a three-level coagulation sedimentation tank for coagulation sedimentation, and discharging the obtained clean water. According to the invention, the waster water in the production of chitin is treated comprehensively, the treating expense is lowered, and the yielding water is superior to the first level discharge standard stipulated by Integrated Waste Water Discharge Standard of People's Republic of China (GB8978-1996).

The invention relates to a combined subsurface-flow constructed wetland system with high efficiency and low cost for processing polluted river water. The system is formed by combing a first-stage vertical subsurface-flow wetland and a second-stage horizontal subsurface-flow wetland, wherein the vertical subsurface-flow wetland comprises a box body (1), a water inlet distribution pipe (2), vertical stand pipes (3), a water outlet collection pipe (4), a water outlet hose (5), a heightened base (6), a furnace slag packing layer (7) and a gravel packing layer (8); the horizontal subsurface-flow wetland comprises a box body (9), a water inlet distribution pipe (10), a porous barrier (11) of a water inlet distribution area, a porous barrier (12) of a water outlet area, a water outlet collection pipe (13), a water outlet hose (14), fixed water level outlets (15), a furnace slag packing layer (16) and a gravel packing layer (17). By adopting the combined subsurface-flow constructed wetland system, total nitrogen and phosphorus in the river water can be effectively removed, the height of the water outlet hose of the vertical subsurface-flow wetland can be adjusted to change the water level of the wetland and the dissolved oxygen content, and the nitrification effect or the denitrification effect can be strengthened; and the cost of furnace slag packing is low.

The invention belongs to the technical field of wastewater treatment, in particular to amethod for treating industrial wastewater containing hexamethylenediamine by sequentially carrying out anaerobic biological treatment, hypoxia treatment, aerobic treatment and drainage to wastewater. The invention has simple process, low operation cost and good wastewater treatment effect, can stably reach the emission standard of chemical industrial wastewater containing the hexamethylenediamine so that various indexes of dischage water stably reach or exceed the A-catalog indexes of national first-order discharge water.

The invention relates to a method for restoring a eutrophic tidal flat sediment habitat. The method comprises the following steps of: preparing bacteria solution; preparing stationary liquid; uniformly mixing and gelling the bacteria solution and the stationary liquid; preparing CaC12 solution; fixedly granulating the gelled bacteria solution; collecting and preserving; carrying out combined operation of plowing and environmental restoration bacteria immobilized particles; arranging shellfishes and clam worms; and regularly monitoring. The method disclosed by the invention is capable of effectively protecting bacterial strains and has the buffer function in an environment that physical and chemical factors are more severe; an effective vector can be provided for the bacterial strains, so that the bacterial strains have the bacteria restoration function effectively for a long time; by means of bioturbation of the shellfishes and the clam worms, the nitration and denitrification effects of sediments can also be effectively increased; and in addition, by means of combined use of the above methods, the method has good environment-friendly value and market application prospect to environmental restoration.

The invention relates to a method for treating high-concentration organic wastewater by anaerobic-aerobic deep coupling. The method comprises the following steps: introducing organic wastewater into an anaerobic reaction unit, and sufficiently mixing the organic wastewater with anaerobic granular sludge added into the anaerobic reaction unit in advance to perform anaerobic reaction; enabling anaerobic effluent obtained after anaerobic reaction to enter an aerobic reaction unit, and removing nitrogen through a synchronous nitrification and denitrification process; flowing part of effluent of the aerobic reaction unit back to the anaerobic reaction unit and fully diluting and mixing the part of effluent with the raw organic wastewater and granular sludge to carry out anaerobic reaction, andenabling the other part of effluent to enter a next treatment process or discharging the other part of effluent after reaching the standard. According to the invention, the anaerobic and aerobic reaction units are coupled to treat wastewater; anaerobic effluent enters the aerobic unit, the DO value in the water body of the aerobic unit is controlled, denitrification is effectively completed, thereflux ratio of the aerobic effluent is controlled, and the aerobic effluent returns to the anaerobic unit again, so that the ammonia nitrogen concentration in the anaerobic reactor is reduced, the activated sludge amount in the anaerobic reactor is ensured, and the anaerobic reaction efficiency is effectively improved.

The invention discloses a method for treating high ammonia-nitrogen wastewater through a multipoint dispersed water injection three-stage compound A / O (Anoxic / Oxic) process and belongs to the field of environment friendliness. The method comprises the following steps: pretreating the high ammonia-nitrogen wastewater, and enabling the wastewater to enter a regulating reservoir; enabling the effluent to enter a biological treatment system, wherein the biological treatment system comprises an A / O reactor in three-stage series operation; respectively injecting water into a primary A / O reactor, a secondary A / O reactor and a three-stage A / O reactor in a dispersed manner according to a ratio, wherein the reactor is jointly built by an anoxic area and an oxic area with the same volume; the inlet water is in a multipoint dispersed injection manner; the inlet water in the primary A / O reactor, the secondary A / O reactor and the three-stage A / O reactor is respectively 30-40%, 20-30% and 10-20% of the total water amount of the inlet water; and the water inlet position is the anoxic area of the three-stage A / O reactor; and enabling the treated wastewater to freely flow out from the top of a secondary sedimentation tank, periodically discharging the sludge, and enabling the sludge to enter the primary A / O reactor through a sludge return pump. The method disclosed by the invention has excellent popularization prospects on treatment of coking plant wastewater.

The invention discloses an MBR (membrane bioreactor) sewage treatment machine. The MBR sewage treatment machine comprises an anaerobic tank, an MBR membrane tank and a disinfection tank which are sequentially connected in an integrated manner, wherein a sewage inlet is formed in a side wall, far away from the MBR membrane tank, of the anaerobic tank, elastic filler is arranged in the tank wall of the anaerobic tank, and two rows of anaerobic tank separating plates are vertically arranged in the anaerobic tank at intervals and are alternately fixed on a top cover and a bottom wall of the anaerobic tank; an aeration pipeline is arranged at the bottom of the MBR membrane tank, the aeration pipeline is connected with a blast blower, the bottom, far away from the anaerobic tank, of the MBR membrane tank is connected with a reflux pump, and the water outlet of the reflux pump is connected to the sewage inlet of the anaerobic tank; and the disinfection tank is connected with a disinfector, and two rows of disinfection tank separating plates are vertically arranged in the disinfection tank at intervals and are alternately fixed on a top cover and a bottom wall of the disinfection tank. The MBR sewage treatment machine disclosed by the invention has the advantages that sewage treatment effect is good, and service life of an MBR membrane can be prolonged.

The invention relates to a biological denitrification treatment method for dimethylamine wastewater. The biological denitrification treatment method comprises the following steps: 1, conveying dimethylamine wastewater to an adjusting tank, and adjusting the pH value; 2, conveying the dimethylamine wastewater subjected to pH adjustment into an ammoniation tank containing obligate ammoniation bacteria, and carrying out ammoniation treatment; 3, carrying out nitrification treatment; 4, carrying out denitrification nitrogen removal treatment; and 5, refluxing the wastewater subjected to denitrification treatment to the ammoniation tank, and repeating the operations in the steps 2-4 until the ammonia nitrogen content and the total nitrogen content in the wastewater meet the requirements, wherein the obligate ammoniation bacteria are obtained by performing sequencing batch enrichment culture on ammoniation bacteria in activated sludge by utilizing a culture solution, and bioactive fillers are arranged in the nitrification tank and the denitrification tank. According to the invention, the obligate ammoniation bacteria cultured by the invention can efficiently convert dimethylamine into inorganic ammonia nitrogen, so that the most core link of dimethylamine biological denitrification is solved; and bioactive fillers are introduced in nitrification and denitrification processes, so thatthe nitrification and denitrification efficiency is improved.

The invention discloses an IOT (Internet of Things)-based biochemical flocculation and adsorption sewage treatment control system. The IOT-based biochemical flocculation and adsorption sewage treatment control system comprises a filter device, a treating pond device, an aeration device, a flow division control device, a detecting device and a stirring device. A flocculating agent is added in sewage, and the sewage in whichthe flocculating agent is added can be filtered through the filter device; a baffle plate net frame, an aggregate layer and a filter net are arranged in a mesoporous filter,a filter and adsorption device is used for adsorbing and removing heavy metal pollutants in the sewage, and then disinfection treatment can be carried out on the sewage, so that the water quality canbe effectively purified, nitrification and denitrification abilities of a water body are increased through aeration, a denitrifying effect of a system is greatly improved, and a set of efficient and quick riverway water body in-situ remediation technology is formed; microorganism on a biological carrier is capable of further degrading the pollutants in the water body, so that the water quality isincreased; the treated sewage can be monitored, and the treated sewage can be conveyed to water use units after meeting the water use standard.

The invention discloses a nitrogen-removing biological filter device and application thereof in treatment of micro-polluted source water. The nitrogen-removing biological filter device comprises an upward flow filter column, a water inlet slot, a water inlet tube, a water outlet tube and an outlet water collector, wherein a supporting plate and a biological filter material layer are arranged in the upward flow filter column from bottom to top in sequence; the lower end of the upward flow filter column is connected with the water inlet slot by the water inlet tube; the water inlet tube is arranged below the supporting plate; the upper end of the upward flow filter column is connected with the outlet water collector by the water outlet tube; the water outlet tube is arranged above the biological filter material layer; the water inlet tube is connected with a constant-flow pump. The nitrogen-removing biological filter device disclosed by the invention can realize synchronous nitrification and denitrification without the need of aeration in an ammonia nitrogen degrading process, so that the ammonia nitrogen is finally converted into a nitrogen gas, and therefore, while energy resources are greatly saved, outlet water quality indexes of the ammonia nitrogen reach standards, and total nitrogen is removed very well.

The invention discloses a denitrifying-based phosphorus and nitrogen removal process for a sequencing batch type two-sludge system, belongs to the technical field of biological treatment of wastewater and is particularly suitable for phosphorus and nitrogen removal treatment of low-carbon source wastewater. The denitrifying-based phosphorus and nitrogen removal process comprises a water inlet and outlet as well as aeration step, a double-precipitation step, a circulation step, a mixing step as well as a precipitation and aeration step; and the water inlet and outlet as well as aeration step, the double-precipitation step, the circulation step, the mixing and aeration step as well as the precipitation and aeration step are carried out in sequence repeatedly according to an operating period. With the adoption of the denitrifying-based phosphorus and nitrogen removal process, as limited carbon sources are fully utilized for denitrifying-based phosphorus removal, the aeration rate is reduced, the utilization ratio of the carbon sources in the wastewater treatment is increased, and the problems of insufficient carbon sources and high aeration energy consumption in the biological phosphorus removal of wastewater are effectively solved; and the denitrifying-based phosphorus and nitrogen removal process has the advantages of saving in the aeration rate, need few carbon sources, low construction and running costs, small occupied area and the like.

The invention discloses an anaerobic and aerobic multistage-wetland sewage treatment device and belongs to the technical field of water purification. The sewage treatment device consists of a grille well, an anaerobic contact tank, an aerobic wetland tank, an anaerobic wetland tank and an effluent well. Composition products of the sewage treatment device are of series connection and comprise the grille well, the anaerobic contact tank, the aerobic wetland tank, the anaerobic wetland tank and the effluent well sequentially from front to back. The grille well can be used for intercepting entrained thick and big foreign bodies from sewage, the anaerobic contact tank is used for lowering the concentration of organic matters in the sewage and decomposing macromolecular organic matters in the sewage into micromolecular organic matters, and plants of the aerobic wetland tank and the anaerobic wetland tank are used for absorbing water nutrients and degrading the organic matters in the sewage. Due to aerobic wetland treatment, nitration and denitration actions can be strengthened, and aquatic plants are used for decomposing and absorbing the organic matters in the sewage so as to construct a good ecological environment; long-term usage is achieved by one-time investment, the maintenance is easy, the sewage treatment effect is good, and the applicable range is extensive.

The invention discloses a treatment method of garbage leachate. The treatment method comprises the following steps of (1) treatment of a semi-aerobic mineralized garbage bed, so as to obtain a leachate after treatment of the semi-aerobic mineralized garbage bed; (2) treatment by a coagulation method, so as to obtain the drained water after coagulation; (3) treatment by an advanced oxidation method: treating the drained water after coagulation in step (2) by an ozone oxidization method or a Fenton method. The treatment method has the characteristics that the operation is simple and convenient,the technology is simple, the cost is low, the requirement on outside environment is low, the treatment method is suitable for quick treatment of the garbage leachate, and the water drainage effect isbetter and stable; the final COD (chemical oxygen demand) and ammonia-nitrogen water drainage effects can reach the pollutant emission concentration limit in Standard for Pollutant Emission at Domestic Garbage Landfill (GB16889-2008), the concentrations of heavy metals, total nitrogen and total phosphor are certainly reduced, and the serious hazard to surrounding environments is avoided.

The invention discloses a method for improving the biological denitrification treatment efficiency of industrial wastewater. The method is characterized in that a biomass carbon iron catalyst filler is added in a biological aerobic tank, industrial wastewater is introduced into the aerobic tank in batches, all reaction outgoing water is completely returned for circulating operation, and an aerobicbiomass carbon iron coupling system through domestication; a biomass carbon iron catalyst filler is added in a biological anoxic tank, and the outgoing water of the biological aerobic tank is mixed with industrial wastewater, and the mixed wastewater is used as inlet water, reaction outgoing water is completely returned for circulating operation, and an anoxic biomass carbon iron coupling systemis formed through domestication; and the two coupling systems are subjected to multi-stage combination to form a multi-stage enhanced denitrification system, industrial wastewater is continuously fedand outgoing water is subjected to sedimentation separation in a sedimentation tank. The method of the invention can realize reduction of the toxicity of refractory organics, strengthen the efficiencyof biological nitrification and denitrification, couple autotrophic denitrification and simultaneous nitrification and denitrification, thereby significantly improving the biological denitrificaitoneffect of industrial wastewater.

The invention discloses a microbial compound nitrogen fertilizer, comprising the following components in percentage by weight: 0.01-20% of immobilized nitrobacteria, 0.01-20% of mycorrhizal fungi enrichment liquid, 0.1-50% of clay filler and balance of urea. The microbial compound fertilizer provided by the invention is added with the immobilized nitrobacteria, mycorrhizal fungi enrichment liquid and clay filler, which can be applied with urea at the same time into the soil to accelerate nitration of urea, thereby avoiding the volatilization loss of ammonia realized by urea hydrolysis and improving the utilization ratio of nitrogen in the nitrogen fertilizer; and meanwhile, the fertilizer is also inoculated with exogenous mycorrhizal fungi to promote the infection rate of mycorrhizal fungi to crops, improve the phosphorous absorption of the crops, benefit the expansion of roots, and further increase the nitrogen adsorption. By the cooperation of the two aspects above, the microbial compound nitrogen fertilizer can improve the utilization rate of nitrogen fertilizer, and can be applied to crops in the drought environment, especially for base fertilizer for culturing winter wheat.

Fertilizers with urease inhibitors and / or nitrification inhibitors are described. The fertilizer can include an extruded granule containing urea, a polymeric binder, and a nitrification inhibitor and / or an urease inhibitor.

The invention relates to an enhanced ecological wetland treatment facility for treating sewage and a method thereof. A sedimentation tank is used to remove floating objects and settleable suspended matters from the sewage; a water body treated by the sedimentation tank is uniformly distributed on a vertical flow filter bed of a vertical flow and horizontal flow combined filter bed through a waterdelivery and distribution system; the effluent enters a horizontal flow filter bed of the vertical flow and horizontal flow combined filter bed through a water collecting pipeline; after the pollutedwater body is biochemically treated by the vertical flow filter bed and the horizontal flow filter bed, the water body enters a secondary ecological wetland through the water collecting pipeline and is discharged into a natural water body after being purified; and the settled sludge in the sedimentation tank is discharged into a sludge drying bed and then is stabilized, and a percolate reflows tothe sedimentation tank for re-treatment. The method for treating the polluted water body by combining the sedimentation tank, the vertical flow horizontal flow filter beds and the sludge drying bed not only effectively treats the polluted water body, but also solves the problem of sludge disposal with low cost, and is suitable for the treatment of rural domestic sewage, city landscape water, polluted water bodies of rivers and lakes and the like.

The invention discloses an enhanced nitrogen and phosphorus removal and resource recycling type constructed wetland system. The constructed wetland system comprises a constructed wetland pool, a water distribution system, an aeration system, a ventilation observation well, a nitrogen and phosphorus removal matrix located in the constructed wetland pool and a liquid level control system, wherein wetland plants are planted in the nitrogen and phosphorus removal matrix. The constructed wetland system provided by the invention has the characteristics of high water quality purification capacity, low capital construction cost, convenience in operation and maintenance, good landscape effect and the like, and can meet the requirements of garbage recycling and resource saving.

The invention relates to improvement on a biological denitrification anoxic (facultative)-aerobic water treatment device. The improvement of the biological denitrification anoxic (facultative)-aerobic water treatment device is characterized in that anoxic and aerobic reaction zones which form internal circulation are adjacently and separately arranged in a way that an anoxic zone is arranged at the periphery of an aerobic zone, and gas-liquid separation flow diversion sloping plate is arranged above the overflow periphery of the upper part of the aerobic zone; a water inlet water distribution zone is arranged above the anoxic zone, and water distribution is carried out by a water distribution pipe stretching into the liquid level of the anoxic zone. Through the structure, the disadvantage of oxygenation caused by feeding water in the anoxic zone and reflux in the prior art can be effectively overcome or reduced, water feeding oxygenation to the anoxic zone can be reduced or limited, dissolved oxygen in the anoxic zone is favorably controlled within a lower requirement range, the anoxia requirements of denitrifying bacteria can be met, and the denitrificaiton effect is further increased; additionally-set power for lifting reflux and a stirring device in the anoxic zone can be omitted, so that the running consumption is reduced.

The invention relates to a method for processing reverse osmosis concentrated water by a catalyzed internal electrolysis and modified biological aerated filter. The method comprises the following steps: 1) performing catalyzed internal electrolysis pre-processing: regulating a pH value of wastewater, and removing organic substances in concentrated water through iron-carbon internal electrolysis reaction; 2) performing two-stage biological filter biological membrane processing: after performing coagulating sedimentation on catalyzed internal electrolysis outlet water, introducing the catalyzed internal electrolysis outlet water into a two-stage biological filter (a denitrification biological filter and an aeration biological filter) to further remove organic substances and ammonia nitrogen in the concentrated water. The method is high in processing efficiency, low in operation cost and capable of effectively removing organic substances which have toxic action to human health and an ecological environment in the concentrated water and improving wastewater biodegradability; the improved aeration biological filter can be suitable for characteristics of high hardness, high alkalinity, high sulfate and the like of the RO concentrated water, so that the water quality of the outlet water meets emission needs and a novel way for processing the reverse osmosis concentrated water is provided.

An anaerobic-aerobic deep coupled method for treating high-concentration organic wastewater comprises the following steps: crushing and screening organic waste, and feeding the slurry from filtrationinto an anaerobic reaction unit for anaerobic fermentation to obtain biogas and biogas slurry; subjecting the biogas slurry after the anaerobic reaction to a synchronous nitrification and denitrification process in an aerobic reaction unit for nitrogen removal; and returning part of effluent from the aerobic reaction unit to the anaerobic reaction unit to be fully diluted and mixed with the raw slurry of organic waste for anaerobic reaction, while discharging the other part of the effluent into next treatment process or discharging the rest effluent on standard. According to the invention, theeffluent from the anaerobic reaction is discharged into the aerobic unit, and the DO value of the water in the aerobic unit is controlled to complete nitrogen removal; then, the effluent from the aerobic reaction is returned to the anaerobic unit again at a controlled reflux ratio for circular reaction; and therefore, the biogas production rate of anaerobic reaction can be increased, while the water quality of the effluent from the aerobic reaction can be higher.

The invention relates to a method for treating high-solid-content organic wastewater by anaerobic-aerobic deep coupling. The method comprises the following steps: crushing and screening organic wastes, adding a slurry liquid obtained by filtration into an anaerobic reaction unit, and carrying out anaerobic fermentation to obtain biogas and biogas slurry; introducing anaerobic outlet water into a solid-liquid separation unit for solid-liquid separation, and enabling separated biogas residues to return into the anaerobic reaction unit through a sludge backflow pump; enabling separated biogas slurry to enter an aerobic reaction unit, and removing nitrogen through a synchronous nitrification and denitrification process; and enabling part of outlet water of the aerobic reaction unit to flow back to the anaerobic reaction unit and undergo full dilution and mixing with organic waste raw slurry liquid for an anaerobic reaction, and enabling the other part of the outlet water to enter a next treatment process or be discharged after reaching the standard. According to the method, the anaerobic outlet water enters the solid-liquid separation unit, suspended solids are separated out, outlet water enters the aerobic reaction unit, the DO value in the water body of the aerobic reaction unit is well controlled, denitrification is completed, then a backflow ratio of aerobic outlet water is controlled and part of the aerobic outlet water returns to the anaerobic reaction unit again, the reaction is circulated, the anaerobic biogas production rate is increased, and meanwhile the water quality of the aerobic outlet water is higher.

The invention provides a rainwater bio-retention pond structure with submerging layers and a method for constructing the rainwater bio-retention pond structure. The rainwater bio-retention pond structure is mainly applied to reducing rainwater runoff flood peaks and managing non-point source pollution due to rainwater runoff and particularly can be applied to purifying urban and rural input type non-point source pollution. The rainwater bio-retention pond structure which is a bio-retention pond sequentially comprises a retention layer, a filter layer, a transition layer and a drain layer. Theretention layer, the filter layer, the transition layer and the drain layer are sequentially constructed from bottom to top; the retention layer is used for storing rainwater, and the transition layer, the filter layer and the drain layer are filled with medium raw materials. The rainwater bio-retention pond structure and the method have the advantages that the transition layer and the drain layerare used as the submerging layers, accordingly, the rainwater can be effectively stored, anaerobic environments can be provided, and the pollutant removal capacity can be enhanced; fillers of the various layers in the pond have interior relations, and definite particle size distribution requirements are applied to the fillers; plant growth fertilizers, adsorption granules, slow-release carbon sources and compound microbial preparations or compound microbial embedded granules are mixed with the various layers in the pond, accordingly, pollution substances in the rainwater can be assuredly efficiently treated by the bio-retention pond for a long term, and obvious nitrogen and phosphorus removal effects can be particularly realized.

The invention relates to a vertical-flow constructed wetland device, in particular to a constructed wetland device for advanced treatment of domestic sewage. The constructed wetland device is a vertical-turning-flow constructed wetland which has the functions of enhancing nitrification and denitrification, improving purification effect and the like, and can improve a constructed wetland system and reduce installation and maintenance cost. The vertical-turning-flow comprises an inner cylinder, an outer cylinder and a matrix hopper, wherein the inner cylinder is a hollow cylinder with an opening in the upper end; the outer cylinder is a hollow cylinder with an opening in the upper end and coincides with the vertical center line of the inner cylinder; and the matrix hopper is of a hollow cuboid-like structure with an opening in the upper end. According to the device, the denitrification effect of nitrate nitrogen is enhanced through a flooding saturation area of the central inner cylinder; and through multiple layers of inner and outer cylinder spacing plates and the matrix hopper, a trickling filtration aerobic zone is formed, the nitrification effect of ammoniacal nitrogen is enhanced, a water body is baffled for times to prolong hydraulic retention time, and a space utilization rate is increased, thereby lowering land cost.

The invention relates to a household garbage transfer station leachate and flushing water treatment system and method and application. The method sequentially comprises the steps of impurity removal, water collection regulation, coagulating sedimentation, biochemical treatment, sludge treatment, a matched water pump and a matched fan. Aiming at the characteristics of percolate and flushing water mixed liquor generated and discharged by small and medium-sized household garbage transfer stations in cities in which dry and wet garbage classification is implemented, an economical, simple, convenient and efficient physicochemical and biochemical combined treatment technology is adopted, and factors such as environment friendliness, economy and controllability, simplicity and convenience in operation and maintenance and the like of the transfer stations are considered, and the treated wastewater can stably meet the discharge requirement.