60results about How to "Reduce water load" patented technology

The invention provides a method for disposing high-salt high-polymer wastewater through the Fenton oxidation and biology combined technology. The disposed high-salt high-polymer wastewater is drilling wastewater. The method is characterized in that the technology comprises primary chemical oxidization, filtration, phosphorous removal, sedimentation, filtration, hydrolyzation, anaerobic processing, secondary chemical oxidization, primary aerobiotic processing and secondary aerobiotic processing. Firstly, due to the fact that the B / C ratio of the wastewater is low, primary chemical oxidization method processing is conducted on the wastewater the B / C ratio can be improved; after oxidized discharged water is filtrated, the water enters a phosphorous removal reaction pool and is deposited and filtrated again; the water with phosphorus removed enters a hydrolysis acidification pool and then enters a middle adjusting pool, and after a pH value is adjusted, the water enters an anaerobic reaction pool; secondary chemical oxidization method processing is conducted on anaerobic discharged water, the B / C ratio is improved, the water enters an aerobiotic biochemical system, and primary contact aerobiotic processing and secondary contact aerobiotic processing are conducted.

The invention discloses an efficient treatment process for printing and dyeing waste water. In the invention, after printing and dyeing waste water is homogenated by a regulating tank and preaerated by a preaeration tank, the printing and dyeing waste water enters a primary precipitating tank to be precipitated; the precipitated waste water enters an oxygen deficiency or an aerobic membrane bioreactor to be treated, and chemical flocculants and biological microcarrier with an absorption function are thrown into an oxygen deficiency zone of the membrane bioreactor; waste water mixture liquid enters an aerobic zone from the oxygen deficiency zone, and is separated by a membrane assembly in the aerobic zone; clean water realizes standard discharge after being filtered by the membrane assembly, and biochemical or materialized mud with high concentration in the aerobic zone respectively returns to the oxygen deficiency zone and the preaeration tank; the biochemical or materialized mud returning to the oxygen deficiency zone is continuously recycled in the membrane bioreactor; and after the biochemical or materialized mud returning to the preaeration tank mixes with the homogenated printing and dyeing waste water for biochemical or materialized absorption and flocculation, the biochemical or materialized mud returning to the preaeration tank enters the primary precipitating tank to be precipitated, and the precipitated mud is discharged out of the system. The invention is not only applicable for the treatment of printing and dyeing waste water, and is also suitable for the treatment of other difficultly degraded waste water.

The invention discloses a filter back washing water recovery processing method and a membrane filtration system thereof. The filter back washing water recovery processing method comprises: 1. pretreating; 2. filtering membranes; and 3. sterilizing. The membrane filtration system utilizes a submersible pump to pump back washing water into a water inlet tank, and water is fetched from the water inlet tank by a water inlet pump and is filtered after being fed to a membrane assembly; part of filtered clean water enter the back washing water tank to participate in the back washing process and is reversely pumped into the membrane assembly by a back washing water pump; and compressed air is blasted in by a pressure tank and an air compressor arranged on the inlet end of the feed liquid of the membrane assembly to clean the membrane assembly. The invention not only improves recycling water quality safety of back washing water in filters in waterwork but also reduces the influence of safety risk when being directly used on a main technology in the waterwork. The invention has the recovery rate of back washing water of 95%, improves the recycling water quality safety of back washing water in filters in the waterwork and lowers the pure water load of main technology.

The invention relates to the field of textile printing and dyeing and in particular relates to a fabric dyeing wastewater treatment method. The treatment method comprises the following steps: collecting gray fabric wash liquid wastewater and wastewater produced in washing and pickling steps after rinsing, classifying and recovering dye residue liquid according to different dyes, collecting cleaning wastewater after dyeing, and treating the collected wastewater by adopting processes such as homogeneous adjustment, screen or filtering net filtration, air flotation, oxidization, biochemical treatment and advanced treatment performed in sequence. According to the technical scheme in the invention, the dyes can be recovered to the greatest degree, the wastewater treatment burden is reduced, recovery benefits are increased, the treatment cost is reduced, and good economic benefits and social benefits are achieved.

The invention discloses a method for realizing a stable biological nitrosation to a wastewater with low carbon nitrogen ratio and high nitrogen content. The method controls the aging of system sludge to 3 days and combines the operational methods of constant water-feeding and interval draining together. The method is carried out according to the following two phases: 1. sludge seeding and incubation phase: firstly the seeded sludge is put into a reactor and the incubation time is 20 days, and an activated-sludge SBR nitrosation process combining constant water-feeding and interval-draining is adopted as the beginning of incubation; 2. stable biological nitrosation operational phase: the activated-sludge SBR nitrosation process combining constant water-feeding and interval-draining which is successfully started is preserved, and the wastewater with low carbon nitrogen ratio and high nitrogen content is adopted as water supply, and the feeding-draining flow each week is a half of the volume of the reactor, the system sludge aging is preserved to be 3 days, and the DO concentration of the reactor is 1.5 to 2mg per L, and the operational cycle is 12 hours. The invention realizes a stable and constant biological nitrosation to the wastewater with low carbon nitrogen ratio and high nitrogen content, and the nitrosation system has better NH4 <plus> minus N degradation rate and higher nitrosation rate.

An ecological pond effluent deep treatment device comprises a drum grille machine; effluent is sprayed into the bottom in an ecological pond through a necking-down water inlet pipe; the effluent of the ecological pond goes into a turbulent-flow nano aeration backflushing screen filter pool; the effluent treated by the turbulent-flow nano aeration backflushing screen filter pool automatically flows into a nano aeration ablation device; the bottom of the nano aeration ablation device is provided with a mud discharge port; a part, above the mud discharge port, of the interior of the nano aeration ablation device is provided with a nano aeration disc; the nano aeration disc is connected with a nano O3 aerator; the nano aeration ablation device is provided with a temperature control instrument, and the temperature control meter is connected with and controls a temperature sensing control head and a heating zone placed inside the nano aeration ablation device. The invention also discloses a method for wastewater treatment by using the device.

The invention discloses a technique for preparation of industrial ultrapure water, which contains: first-rate hyperfiltration of the pretreated water, through the degassing device and electric desalinization, after first-rate hyperfiltration of said pretreated water to desalt, adding acid; after decarbonation by degassing device, adding alkali; then flowing into electric desalinization instrument for fine desalinization to prepare industrial ultrapure water. According to the work characteristic of degassing film and electric desalinization instrument (EDI); using the decarbonation technique of adding acid- decarbonation- adding alkali' and strong electrolytes replacing weak electrolytes, it is convenient for deep desalinization by electric desalinization instrument.

Provided is a water-level-variable terminal catchment inclined tube or inclined plate sedimentation tank. The invention relates to a sedimentation tank to solve the problem that the water in conventional inclined tube / inclined plate sedimentation tanks can not adjust with the change of influent load, and the gathered water yields in effluent weirs are large. A plurality of effluent weirs are disposed on the top of rear section of a tank body. A plurality of stand columns are disposed on the terminal section of the tank body water inlet terminal and any longitudinal sides of the tank body. A fixed flashboard and a movable flashboard which are mutually parallel are arranged between each two stand columns. The fixed flashboards are located on the outside of the tank body. The movable flashboards are located inside of the tank body. The lower terminal faces of the fixed flashboards and the movable flashboards are all provided with a plurality of water inlet holes. The above of each movable flashboard is provided with a hoist. Start and stop levers on the hoists are connected with the movable flashboards. Both sides of each effluent weir are respectively provided a lifting board. The lower terminal of each lifting board is uniformly provided with a plurality of lifting rods along the length of the lifting board. The lower terminal of each lifting rod is provided with a regulator. The sedimentation tank is used for removing the water turbidness.

The invention discloses a rapid start method for an anaerobic ammonia oxidation reactor. The rapid start method comprises the following steps: by using a dynamic membrane bioreactor and by taking aerobic sludge and / or anaerobic sludge as inoculums, controlling the concentration of ammonia nitrogen and nitrite nitrogen of fed water, feeding a nutrient solution, filtering off the water by using a dynamic membrane, and enabling the reactor to continuously operate for at least 30 days, thereby achieving rapid domestication and enrichment of anaerobic ammonium oxidation bacteria inside the bioreactor. The rapid start method is applicable to anaerobic ammonia oxidation denitrification treatment on municipal sewage and industrial wastewater, and has the advantages of rapid start, high treatment efficiency, stable system operation, good effluent effect, low cost and the like.

The invention discloses an urban rainwater pipeline system capable of effectively supplementing underground water. The urban rainwater pipeline system includes a plurality of rainwater openings, filtering screens, rainwater connecting pipes and manholes which are quantitatively corresponding to the rainwater openings respectively, municipal rainwater pipes and filtering layers; each rainwater opening is provided with a first channel which is communicated with two ends of the rainwater opening; and each rainwater connecting pipe is provided with a second channel which is communicated with two ends of the rainwater connecting pipe; each municipal rainwater is provided with a third channel which is communicated with two ends of the municipal rainwater; the manholes are provided with cavities; the rainwater openings are connected with the rainwater connecting pipes; the first channels and the second channels are connected together so as to form channels which are communicated with the rainwater openings and the rainwater connecting pipes; the rainwater connecting pipes are connected with the manholes; the second channels are communicated with the cavities of the manholes; the manholes are connected with the municipal rainwater pipes; the cavities of the manholes are communicated with the third channels of the municipal rainwater pipes; the municipal rainwater pipes are provided with water seepage holes which are communicated with the interiors and the exteriors of the pipe walls of the municipal rainwater pipes; the exteriors of the municipal rainwater pipes are provided with the filtering layers; the filtering layers completely cover the water seepage holes; and the filtering screens are arranged at end portions of the rainwater connecting pipes, wherein the end portions of the rainwater connecting pipes are adjacent to the rainwater openings.

The invention discloses a return-flow type iron-carbon micro-electrolysis-coupling Fenton water treatment reaction device, which comprises an iron-carbon micro-electrolysis-coupling Fenton reactor, a return tank and a dosing pipeline mixer. The return-flow type iron-carbon micro-electrolysis-coupling Fenton water treatment reaction device is characterized in that a water inlet pipeline is arranged on the lower part of one side of the iron-carbon micro-electrolysis-coupling Fenton reactor, and an iron-carbon tank water outlet pipeline is arranged on the upper part of the other side of the iron-carbon micro-electrolysis-coupling Fenton reactor; waste water enters the dosing pipeline mixer to be fully mixed with H2O2, then enters the iron-carbon micro-electrolysis-coupling Fenton reactor, and enters the return tank via the iron-carbon tank water outlet pipeline; after the waste water stays for a period of time, one part of the waste water returns to the water inlet pipeline via a return pipeline, and the other part of the waste water is discharged. The iron-carbon micro-electrolysis-coupling Fenton reactor is filled with iron-carbon filler, the upper part of the iron-carbon micro-electrolysis-coupling Fenton reactor is provided with a feeding hole, and the lower part is provided with a reloading hole; the return tank is filled with small hollow plastic balls.

The invention provides a slight-splashing high-performance two-hull amphibious aircraft which comprises an aerodynamic lift type main fuselage, wings, empennages, turbofan engines and slight-splashing sliding hulls. The wings 2 are arranged in the middle of the aerodynamic lift type main fuselage. The turbofan engines are arranged on the upper position, near the aerodynamic lift type main fuselage, of the wings. The empennages are arranged at the tail end of the aerodynamic lift type main fuselage. The two slight-splashing sliding hulls are arranged on the two longitudinal sides of the lower portion of the aerodynamic lift type main fuselage. A longitudinal aerodynamic groove channel 5 is formed after the connection of the two slight-splashing sliding hulls and the aerodynamic lift type main fuselage. The aerodynamic lift type main fuselage is provided with reverse profile planing steps which divide the aerodynamic lift type main fuselage into a front fuselage body and a rear fuselage body. An upper transverse bent sliding face and a lower transverse bent sliding face are arranged in the position, at the bottom of each slight-splashing sliding hull, on the sliding face of the front fuselage body sequentially from inside to outside. The anti-wave ability of the amphibious aircraft is improved, and the amphibious aircraft has an excellent hydrostatic and wave splashing controlling ability to adapt to a more complex marine environment.

The invention discloses a sewage treatment system and method for strengthening anaerobic ammonia oxidation denitrification and dephosphorization of domestic sewage. The sewage treatment system comprises a filtering module, an anaerobic-aerobic-anoxic baffled reactor (AOABR) module, a water distribution module and a combined constructed wetland module which are connected in sequence. The AOABR module is arranged at the front end of the combined constructed wetland module; the intermittent micro-aeration AOABR can reduce the organic load entering a constructed wetland, reduce the wetland blockage risk, improve the abundance of anaerobic ammonia oxidation autotrophic bacteria in a first-stage saturated flow wetland, retain an ammonia nitrogen substrate required by anaerobic ammonia oxidationreaction and create a micro-aerobic condition on the surface layer of the wetland to form a nitrite nitrogen substrate; under the condition of low organic matter load, the mutual benefit and symbiosisof denitrifying phosphorus removal bacteria and anaerobic ammonium oxidation bacteria in a saturated flow wetland are also facilitated, the coupled synergistic removal of nitrogen and phosphorus is realized under the conditions of low energy consumption and carbon limitation, and the removal efficiency of total nitrogen and total phosphorus can be up to 90% or above by combining multistage saturated and unsaturated flow wetlands.

The invention relates to a treatment system and a treatment method of oil refinery alkaline residue wastewater. The treatment system comprises a waste alkali storage tank, a denitrification unit, a primary biochemical unit, a secondary biochemical unit, an ozone catalytic oxidation unit and a nitration unit. The treatment system and the treatment method have the advantages of effective and stable removal of most CODs from the alkaline residue wastewater, mitigation of the treatment load of a subsequent common biochemical treatment technology, improvement of the impact resistance of a whole sewage treatment plant, stable quality of outlet water, simplicity in operation, and low engineering cost and running cost, and can be widely applied to the field of high-concentration alkaline residue wastewater treatment of the oil refining petrochemical industry.

The invention discloses a preparation method of an epinastine hydrochloride fine granule. According to the preparation method, a composite flavoring agent is prepared from aspartame, sucralose, and glycyrrhizic acid monoammonium S at a mass ratio of 8:1:1, a sweet filler is taken as an assistant agent, and synergistic effect is achieved via adding an appropriate amount of an essence, so that the bitter taste of epinastine hydrochloride is covered effectively, and patient drug compliance is improved. According to the preparation method, problems that epinastine hydrochloride fine granule particle size distribution range is relatively wide, and much particle fine powder is generated are solved effectively via controlling on parameters such as adhesive aqueous solution concentration, fluidized bed temperature, and drying time, and stable and uniform granules are obtained. The auxiliary materials of the preparation method are cheap and easily available; preparation is simple; no special equipment is needed; production cycle is short; cost is low; and the preparation method is suitable for industrialized production.

The invention relates to a monitoring system for the water quality safety of drinking water. The monitoring system comprises a water plant regulation and control device and a water source regulation and control device, wherein the water plant regulation and control device comprises a raw water quality toxicity online monitor, an effluent water quality toxicity online monitor and a water plant center control PC (Personal Computer) machine; the raw water quality toxicity online monitor and the effluent water quality toxicity online monitor are connected with the water plant center control PC machine through a signal line; the water source regulation and control device comprises a water source water quality toxicity online monitor and a water source center control PC machine installed on a drinking water source water quality control point; the water source water quality toxicity online monitor is connected with the water source center control PC machine in a wireless communication way; the water source center control PC machine and the water plant center control PC machine are connected through a wireless communication way or a network communication way. The invention also relates tothe monitoring system for the water quality safety of the drinking water and a processing method thereof which are realized through the devices, so that a water plant technology can quickly respond tosudden water pollution problems, and therefore, the safety of effluent water is guaranteed.

The invention relates to the technical field of industrial wastewater, and discloses an internal circulation anaerobic reaction system, which comprises an anaerobic tank body, and is characterized inthat a reaction region is arranged in the anaerobic tank body; A biogas collection chamber is arranged at the top of the anaerobic tank body and connected with the water seal tank through a biogas collection pipe and a biogas main pipe, the water seal tank is connected with a biogas outlet pipe, and biogas is discharged through the biogas outlet pipe; An effluent weir is arranged at the inner topof the anaerobic tank body and is provided with a water outlet pipe; A three-phase separator is arranged at the inner top of the anaerobic tank body; A water distribution device is arranged at the bottom of the anaerobic tank body; A jet device is arranged at the outer bottom of the anaerobic tank body, a water outlet of the jet device is connected with the part, located outside the anaerobic tankbody, of the water distribution device, a gas guide port of the jet device is connected with a biogas main pipe through a biogas guide pipe, and a water inlet of the jet device is connected with a circulating water pipe arranged between the three-phase separator and the effluent weir. The reaction speed of wastewater and sludge can be increased, the sludge removal effect is improved, and sludge deposition is avoided.

The integrated sewage treating apparatus consists of two parts of ground trickling filtration tower and underground percolation system. The trickling filtration tower with ventilation port has filled stuffing as the biological film growth carrier, water distributing plate in the top, isolating net in the bottom and water outlet pipe connected to the water distributing pipe in the underground percolation system. The underground percolation system has water outlet pipe buried in the bottom gravel layer, anaerobic tank buried in the upper soil, and underground percolating water distributing pipe buried in the gravel layer in the upper part of the anaerobic tank. In the trickling filtration tower, the sewage has most ammonia nitrogen converted into nitrate nitrogen and most of BOD degraded; in the underground anaerobic tank, the residual suspended grains are intercepted and nitrate nitrogen is denitrified; and the sewage is further percolated and deep treated.

The invention discloses a system for concentrating and reducing desulfurization wastewater by using flue gas waste heat. The system comprises a dust remover, an induced draught fan, a flue channel with a spraying device, a desulfurization island, a water collection tank, a solid-liquid separator, an intermediate water tank and a concentration tank which are successively in conduction connection with each other, wherein the concentration tank is communicated with the intermediate water tank. The invention also discloses a process for concentrating and reducing desulfurization wastewater by using flue gas waste heat. The process comprises the following steps: (1) flue gas dust removal; (2) mass transfer and heat transfer of flue gas and water; (3) condensation in the desulfurization island; and (4) post-treatment of desulfurization wastewater. The step (4) of post-treatment of desulfurization wastewater comprises the following substeps of successively treating the desulfurization wastewater through the water collection tank, the solid-liquid separator and the intermediate water tank; collecting the desulfurization wastewater through the water collection tank, separating the desulfurization wastewater into sludge and water through the solid-liquid separator, enabling the water to flow into the intermediate water tank for circulation concentration and applying the water to spraying of the step (2). Through the system for concentrating and reducing desulfurization wastewater by using flue gas waste heat and the process thereof, the high-temperature flue gas is used for evaporating and concentrating the desulfurization wastewater, so that the water load entering the curing unit is reduced, and the cost of the concentration technology of the desulfurization wastewater is reduced; when the temperature of the flue gas is reduced, the water consumption in the desulfurization island is reduced, so that the water consumed by the desulfurization process is indirectly supplemented; the process is obvious in economic benefit.

The invention discloses a printing and dyeing wastewater pretreatment process. The printing and dyeing wastewater pretreatment process comprises the following concrete steps: S1, carrying out a flocculation reaction in a flocculation device; S2, allowing the wastewater to enter a horizontal flow sedimentation pool, allowing a supernatant to flow into an overflow water collection tank, and allowingsludge to be scraped into a sludge hopper; S3, carrying out oxidation treatment in an ozone oxidation pool; and S4, carrying out biochemical treatment in an A / 0 pool. The invention relates to the technical field of wastewater treatment. Through application of the printing and dyeing wastewater pretreatment process, the water inlet load of a biochemical section can be reduced; through ozone oxidation pretreatment of printing and dyeing wastewater, macromolecular refractory organic dyes can be oxidized and decomposed into micromolecular pollutants which are easy to be biologically treated; meanwhile, the required concentration of ozone is low; the wastewater subjected to ozone oxidation pretreatment contains dissolved oxygen, so pre-oxygenation of subsequent biochemical treatment can be realized; the aeration rate of a subsequent biochemical section is reduced; energy consumption is reduced; the biodegradability of the wastewater can be improved; and the influences of large occupied area of a pool body and foul smell pollution caused by anaerobic sludge in a traditional anaerobic hydrolysis pretreatment process are avoided.

The invention relates to a denitrifying denitrification method for coupling sulfur autotrophic bacteria and heterotrophic bacteria. The method comprises the following steps that a, inoculated sludge is injected into a reactor containing low-carbon-nitrogen-ratio wastewater, so that the concentration of the inoculated sludge is 2.5-5 g / L, and the ratio of VSS to SS is 0.75-0.8; b, hydrophilic sulfur powder with the initial concentration of 8-15 g / L is added into the wastewater, sodium bicarbonate is added according to the ratio of sodium bicarbonate to nitrate nitrogen is 5-8, and sulfur powder is added according to the ratio of the sulfur powder to the nitrate nitrogen is 2-3; c, after 30-40 days of starting period under the conditions that the pH value is 6.5-7.5 and the dissolved oxygen concentration of 0.2-0.5 mg / L, the method is completed. The problems are solved that in a traditional denitrification method using denitrification sulfur autotrophic bacteria, extra carbon sources need to be added, excessive carbon sources cause COD standard exceeding, insufficient carbon sources cause low denitrification efficiency, and the total nitrogen of outflow water does not meet standards.

The invention discloses a technique for preparation of industrial ultrapure water, which contains: first-rate hyperfiltration of the pretreated water, through the degassing device and electric desalinization, after first-rate hyperfiltration of said pretreated water to desalt, adding acid; after decarbonation by degassing device, adding alkali; then flowing into electric desalinization instrument for fine desalinization to prepare industrial ultrapure water. According to the work characteristic of degassing film and electric desalinization instrument (EDI); using the decarbonation technique of adding acid- decarbonation- adding alkali' and strong electrolytes replacing weak electrolytes, it is convenient for deep desalinization by electric desalinization instrument.

An oxidization promoting method used in treating water features that after the ozone gas is contacted with the water to be treated, the ozone gas and hydrogen peroxide are filled while their filled amounts are controlled for preventing overfill or underfill.

In order to solve the problems of air pollution and waste of water resources caused by traditional sanitation work vehicles and garden work vehicles in China's large and medium cities currently, the invention designs a novel sanitation and garden work vehicle. The novel sanitation and garden work vehicle integrates and simultaneously completes traditional urban road sanitation work and garden work, clean energy (electricity, natural gas, and the like) is used to provide power for a vehicle driving power system and a sanitation and garden work power system, and reclaimed water is used as water for sanitation and garden work. Small supply stations for the novel sanitation and garden work vehicle are arranged in a distributed way in cities. In-place recycling of resources is realized through in-place treatment of urban domestic sewage. Intensive operation of urban sanitation and garden work is realized through Internet-of-things intelligent management of vehicles and supply stations.

The invention relates to the technical field of railway tunnel construction, in particular to an open cut tunnel waterproof and drainage system. The system involves a tunnel wall and a tunnel invertedarch, a central drainage pipe is arranged below the tunnel inverted arch, longitudinal drainage pipes are arranged on the two sides of the tunnel wall and arranged in the tunnel direction, multiple water permeable holes are formed in the upper portions of the longitudinal drainage pipes, and the longitudinal drainage pipes are connected with the central drainage pipe through transverse drainage pipes. According to the system, the back drainage capacity of an open cut tunnel lining can be enhanced, underground water is effectively drained, the water load around the tunnel lining is reduced, meanwhile, the anti-floating and cold-proof effects are achieved, the waterproof and drainage problems of the tunnel open cut tunnel lining in a high-water-level stratum in a cold region are solved, andthe freezing damage to the tunnel open cut tunnel is effectively reduced.

The invention discloses the field of integrated sewage treatment equipment with a front-end pretreatment function. The equipment comprises an adjusting tank, an integrated sewage treater, a water production tank and a water distribution well, wherein algae and photosynthetic bacteria are arranged in the water distribution well; an aerator is arranged at the bottom of the water distribution well, and the aerator is connected with an air blower; the adjusting tank is connected to the water distribution well through a water pump; the lower part of the water distribution well is connected into ananoxic tank through a water pump. Under the stirring action of the aerator in the water distribution well, on the premise that dissolved oxygen in the tank is not increased, the phenomena that sludgeis accumulated for a long time, deteriorates and smells and floats upwards due to anaerobic reaction are prevented, and the effect of improving the environment in the tank is achieved; an algal-bacterial symbiotic mode is formed in the water distribution well, so that the sewage pretreatment effect is greatly improved, the water feeding load of integrated sewage treatment equipment is obviously reduced, and the water discharge stability of the system is enhanced. The operation is simple, the energy consumption is reduced, and the investment cost is saved.

The invention discloses a filter back washing water recovery processing method and a membrane filtration system thereof. The filter back washing water recovery processing method comprises: 1. pretreating; 2. filtering membranes; and 3. sterilizing. The membrane filtration system utilizes a submersible pump to pump back washing water into a water inlet tank, and water is fetched from the water inlet tank by a water inlet pump and is filtered after being fed to a membrane assembly; part of filtered clean water enter the back washing water tank to participate in the back washing process and is reversely pumped into the membrane assembly by a back washing water pump; and compressed air is blasted in by a pressure tank and an air compressor arranged on the inlet end of the feed liquid of the membrane assembly to clean the membrane assembly. The invention not only improves recycling water quality safety of back washing water in filters in waterwork but also reduces the influence of safety risk when being directly used on a main technology in the waterwork. The invention has the recovery rate of back washing water of 95%, improves the recycling water quality safety of back washing water in filters in the waterwork and lowers the pure water load of main technology.

The invention provides a method for integrally treating coking wastewater, which is based on engineering practice of treating the coking wastewater based on a high-efficiency integrated innovative process technology of miscible nano air flotation enhanced flocculation, A2O, a biological fluidized bed, multi-medium filtration, catalytic ozonation, ultrafiltration and reverse osmosis. The technical purposes of zero dilution and zero discharge of the coking wastewater and reuse of 64% of the wastewater to a coking circulating water supply system are achieved, main advanced technical indexes such as COD (Chemical Oxygen Demand) of effluent of the treated wastewater is less than or equal to 30mg / L, ammonia nitrogen is less than or equal to 5mg / L and the like, and particularly for concentrated water generated by a membrane filtration process, after the technical measures of adopting a special cyanide removal agent and performing coagulating sedimentation treatment, the effluent of the treated wastewater is subjected to zero dilution and zero discharge and 64% of the wastewater is recycled to a coking circulating water supply system. And the water quality index completely meets the Emission Standard of Pollutants for Coking Chemical Industry (GB16171-2012).

The invention discloses a sewage treatment system and a sewage treatment method, and relates to the technical field of sewage treatment. The sewage treatment system comprises an advanced oxidation subsystem, a biochemical oxidation subsystem, a first sedimentation tank and a first supernate pipeline, and an outlet of the advanced oxidation subsystem is communicated with an inlet of the biochemical oxidation subsystem. And the outlet of the biochemical oxidation subsystem is communicated with the inlet of the first sedimentation tank. The first sedimentation tank is provided with a supernatant discharge port, and the supernatant discharge port is communicated with an inlet of the advanced oxidation subsystem through a first supernatant pipeline. According to the scheme, the technical problem of relatively long technological process of a pyrolysis sewage treatment system in related technologies can be solved.

The invention relates to the technical field of sewage treatment, in particular to a papermaking sewage advanced treatment system and method. The system comprises a pretreatment system, an anaerobic treatment system, an aerobic treatment system and an advanced treatment system which are sequentially connected through pipelines from upstream to downstream, and a water outlet of the aerobic treatment system is further connected with a water inlet of the pretreatment system through a pipeline. A part of effluent of the aerobic treatment system flows back to the pretreatment system; the water inlet amount of the anaerobic treatment system can be effectively increased; the inlet water COD and TN concentration of the anaerobic treatment system are reduced; therefore, the water inlet load of theanaerobic treatment system is reduced, it is guaranteed that the anaerobic treatment system is always in the optimal reaction condition, the COD removal rate of the anaerobic treatment system is increased, the treatment pressure of the aerobic treatment system is reduced, and the treatment efficiency of papermaking sewage is improved on the basis of saving the cost.