31results about How to "Reduce the concentration of organic matter" patented technology

The invention discloses a country distributed domestic sewage treating system and method. The system comprises a sewage collection tank (2), an anaerobic filter tank (1), ecological floating islands (11) and a constructed wetland (12), wherein the sewage collection tank (2) is connected with the anaerobic filter tank (1) through a water feeding pipe (3); the anaerobic filter tank (1) is connected with the constructed wetland (12) through a middle water discharging pipe (10); the ecological floating islands (11) float on the water surface of the constructed wetland (12); the constructed wetland (12) is connected with a water discharging pipe (18); the anaerobic filter tank (1) comprises parts of a sewage outlet (5), a sludge settling zone (6), a water distributing hole plate (4), a sludge suspension zone (7), elastic packing (8), the middle water discharging pipe (10) and an exhaust pipe (9) from bottom to top in sequence. The system and the method have the characteristics that the mixed liquor concentration is improved, the waterpower degree is high, blockage and power consumption are avoided, the operation management is simple and convenient, and the greening effect and the ecological effect are good; the country distributed domestic sewage treating system and method are suitable for popularization and application are facilitated.

The invention relates to a mud absorption purification water processing method and a device thereof. One part of the precipitated mud that is discharged from a secondary precipitation pond (8) is used as return-flow mud (10) to be returned to an aeration tank, and the other part of the mud (11) is sent into a mud modification aeration tank (12) so as to perform the mud modification aeration pre-treatment; the mud (2) after the aeration modification is conveyed to an inertial precipitation pond (3) to be mixed with the sewage, and the mud (14) after the absorption and precipitation is discharged into a mud processing system. The aeration processing time of the mud modification aeration tank is 15 to 120 minuets, and the dissolved oxygen of the mud is 0.5 to 1.5 mg / L. The invention has the advantages that the activity of the mud is improved and the absorption and precipitation property of the mud is improved through the appropriate aeration; after the mud flows back, the removal efficiency of the inertial precipitation pond is greatly improved, and the organic matter concentration of the discharged water of the inertial precipitation pond is reduced, thereby reducing the load of the following processing procedures, and reducing the processing cost.

The invention provides a culture water quality regulating and controlling method of a penaeus vannamei boone freshwater pond. The culture water quality regulating and controlling method comprises the following steps in sequence: (1) carrying out anaerobic nitrification; (2) carrying out aerobic nitrification; (3) purifying photosynthetic bacteria; (4) carrying out microalgae cultivation and purification. Water pumped out from the freshwater pond for culturing penaeus vannamei boone is subjected to the anaerobic nitrification, the aerobic nitrification, the photosynthetic bacterium purification and the microalgae cultivation and purification in sequence, and then the water is reflowed back to the freshwater pond for culturing penaeus vannamei boone. According to the culture water quality regulating and controlling method, organic matters in the pond water can be decomposed into small molecular substances and the small molecular substances are cultured and absorbed by the photosynthetic bacteria and mixotrophic microalgae, and are converted into a microalgae organism; the treated and qualified water and cultured beneficial microalgae are discharged into the pond for cyclic utilization; after the beneficial microalgae enter the pond, population advantage is formed and a culture biological environment is improved; the water quality treatment effect is good, and a whole water treatment process does not utilize a culture water body and normal growth of the penaeus vannamei boone is not influenced; the method is high in operability and low in operation cost, and is safe and reliable to the cultured penaeus vannamei boone.

The invention discloses a method and a system for treating high-salinity and poor-biodegradability percolate. The method comprises the following steps: removing a large amount of suspended matters anda part of macromolecular organic matters in the percolate by adopting coagulating sedimentation; enabling supernatant after carrying out coagulating sedimentation pretreatment to enter a two-stage DTRO (Disk Tubular Reverse Osmosis) system, thus obtaining two-stage DTRO produced water and two-stage DTRO concentrated water; separating salt from the two-stage DTRO concentrated water by adopting DTNF (Disk Tubular Nanofiltration), thus obtaining DTNF produced water and DTNF concentrated water; concentrating the DTNF produced water by adopting DTRO-L, thus obtaining DTRO-L produced water and DTRO-L concentrated water; enabling the DTRO-L produced water to flow back to a water inlet end of the two-stage DTRO system; treating the DTNF concentrated water by adopting advanced oxidation, removinghigh-concentration organic matters, and then recharging a landfill; treating the DTRO-L concentrated water by adopting an MVR (Mechanical Vapor Recompression) evaporation crystallizer, thus obtainingcrystallized salt and MVR condensed water; mixing the condensed water with the two-stage DTRO produced water, carrying out standardized discharging, and discharging the crystallized salt. According tothe method and the system, disclosed by the invention, the percolate which is high in salinity and difficult in biochemical treatment can be treated by adopting multiple combination technologies, theyield of the produced water is effectively increased while standardized discharging of the produced water is ensured, and the operating pressure of a membrane system is reduced.

The invention discloses an SRR deodorant for treating garbage stench and a deodorization method thereof. The deodorant comprises the following raw materials: an active free radical source, an active excitation agent, a balanced stabilizer and a persistent effect accelerant, wherein the free radical source is a mixture of a halogen free radical source, an SR free radical source and a hydroxyl free radical source; the SRR deodorant can be used for deodorizing garbage; the odor of the garbage processed by the process can be removed or relieved for 2-3 days; the garbage ripening process is accelerated; maximal utilization of garbage resources is facilitated; toxic and harmful organic matters in landfill leachate are reduced; subsequent treatment is facilitated; the organic matter concentration, heavy metal ions, COD and BOD content in the landfill leachate are reduced; and subsequent biochemical treatment of the landfill leachate is facilitated.

The invention discloses a method for extracting nicotine in tobacco wastewater. The method comprises the following steps: using an alkali solution to adjust the pH value of tobacco wastewater to 11-13, stirring for 1-2 h, then adding an organic solvent for extraction, shaking for 20-30 min, and standing for layering and further for obtaining the organic phase; adding a sulfuric acid solution with the mass concentration of 20-30% into the organic phase for reextraction, so as to obtain a nicotine sulfate solution; adding a salt solution into the nicotine sulfate solution, and then performing reduced-pressure distillation to obtain nicotine sulfate. The method provides a new approach for extraction of nicotine in tobacco wastewater. On the one hand, the method helps to substantially reduce the concentration of organics in wastewater and effectively improve the subsequent biochemical processing efficiency, and on the other hand, extracted nicotine can be further processed and used as a pharmaceutical-grade product.

The invention discloses an aeration biological activated carbon filter. The aeration biological activated carbon filter consists of a filter body, steady water layers, activated carbon filter layers, supporting layers, perforated filter plates, water distribution layers, backwashing gas and water main pipes, backwashing holes I, backwashing gas and water branch pipes, backwashing holes II, aeration main pipes in a filter, aeration branch pipes in the filter, long handle filter nobs, inspection manholes, water rectifier grilles, backwashing drainage channels, water channels of the filter, exhaust pipes, aeration main pipes outside the filter, backwashing soil stacks, backwashing horizontal drainage pipes, backwashing drainage main pipes, primary filter drain pipes, backwashing water supply pipes, water inlet pipes of the filter, self-control valves, backwashing intake pipes, an aeration draught fan, a backwashing waste water collecting tank, a backwashing water supply pump, a backwashing supplying fan, a connected platform, a communicating pipe of the filter water channels, a filter cap, a perforated sleeve, a filter rod, an air intake, and an air intake seam. The aeration biological activated carbon filter provided by the invention adopts coal columnar activated carbon as a filter material, and lower volume load is selected for operation, a small-resistance water distribution system is adopted for backwashing, and the aeration biological activated carbon filter is suitable for preprocessing the tail water of pulping and papermaking, and the effect is good.

The invention discloses a kitchen sewage multi-stage treatment process, and belongs to the technical field of sewage treatment. The treatment process comprises the following steps: performing three-phase separation in a regulating tank; carrying out primary anaerobic high-temperature fermentation; carrying out secondary anaerobic medium-temperature fermentation; precipitating in a precipitation tank; performing a normal-temperature biochemical treatment in a biochemical pool; performing a sedimentation treatment in a secondary sedimentation tank; and discharging processed water into a clean water tank. The heat in the sewage treatment front process is fully utilized; energy is fully and efficiently utilized in a gradient mode, organic matters in sewage are degraded step by step, and the process can adapt to the characteristics of low pH, high SS, high COD, high oil content and the like of kitchen sewage, has the characteristics of high energy utilization rate, high biogas yield, high COD removal rate, stable treatment effect, low operation and maintenance cost and the like, can realize up-to-standard discharge of the kitchen sewage, and is suitable for popularization and application in the field of kitchen sewage treatment.

The invention discloses an efficient catalytic oxidation system based on adsorption and desorption coupling of a double-circulating fluidized bed. The system comprises a spiral feeder 1 used for adsorbing particle feed and a discharge outlet 13 used for adsorbing particle discharge. A double-circulating fluidized bed system for adsorption and desorption comprises an adsorption riser 2 for organicwaste gas, an adsorption cyclone separator 3, an adsorption return feeder 4, a desorption riser 5, a desorption cyclone separator 6 and a desorption return feeder 7. A system for catalytic oxidation of organic waste gas comprises a catalytic oxidation device 9 and an emptying valve 10, wherein the spiral feeder 1 is connected with the bottom of the adsorption riser 2, the top of the adsorption riser 2 is connected with the top of the adsorption cyclone separator 3, the bottom of the adsorption cyclone separator 3 is connected with the desorption riser 5 through the adsorption return feeder 4,the top of the desorption riser 5 is connected with the top of the desorption cyclone separator 6, and the bottom of the desorption cyclone separator 6 is connected with the spiral feeder 1 through the desorption return feeder 7.

The invention provides an organic industrial tail water treatment method based on an ozone oxidation and biodegradation near-field coupling system. The method comprises the following steps: firstly, putting a sponge carrier with a biological membrane attached and grown inside into a circulating reactor, introducing air into an ozone generator through an air pump to generate ozone, introducing theozone into the circulating reactor, adjusting the ozone yield of the circulating reactor through a flow meter and an ozone generator adjusting knob in the period, and uniformly fluidizing the sponge carrier under the action of ozone gas to degrade pollutants under the synergistic action of microorganisms loaded on the sponge carrier and the ozone. Easy-to-degrade organic matters generated by ozoneoxidation can be quickly utilized by the microorganisms in internal pores of the composite carrier, so that the degradation and mineralization rates of pollutants are increased, the toxicity of effluent is effectively reduced, and the occupied area and the construction and operation cost are reduced.

The invention discloses an advanced treatment method of anaerobic effluent of cassava alcoholic waste liquor, and belongs to the technical field of wastewater purification treatment. Inoculated sludge is moderate-temperature anaerobic granular sludge in a food processing factory, an upflow anaerobic sludge blanket (UASB) is used as a reactor, the sludge is subjected to continuous anaerobic treatment under the condition of a moderate temperature of 35 DEG C, the fermentation property of the sludge is analyzed, meanwhile, a kinetic model is built to provide optimizing operation parameters for the fermentation process, and a reliable operation management theoretical guidance is provided for treatment of actual cassava alcoholic waste liquor. Anaerobic deep fermentation of the wastewater can produce a lot of marsh gas, the waste liquor of the first-stage high-temperature anaerobic effluent of cassava alcohol can be effectively treated, and detoxifiton, reduction and recycling of the high-concentration organic wastewater are achieved. The method is simple and easy to operate, high in stability, and capable of effectively treating the waste liquor of the first-stage high-temperature anaerobic effluent of the cassava alcohol.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a pharmaceutical wastewater treatment system and a pharmaceutical wastewater treatment process. The pharmaceutical wastewater treatment system comprises a wastewater regulating tank, a primary flocculation tank, a primary sedimentation tank, a lifting tank, an anaerobic tank, an aerobic tank, a secondary flocculation tank and a final sedimentation tank which are connected in sequence; and the lifting tank is connected with double-electrode-layer equipment. The pharmaceutical wastewater is sequentially subjected to pH value regulation by the wastewater regulating tank, flocculation by the primary flocculation tank and solid-liquid separation by the primary sedimentation tank, the separated waste liquid is introduced into the lifting tank, the waste liquid stored in the lifting tank is subjected to high-voltage pulse electro-catalysis treatment by the double-electrode-layer equipment, the treated waste liquid is sequentially subjected to biochemical treatment by the anaerobic tank and the aerobic tank, and flocculent precipitation and solid-liquid separation are conducted through the secondary flocculation tank and the final sedimentation tank to complete treatment of the pharmaceutical wastewater. The pharmaceutical wastewater can meet the discharge requirement after being treated, and the treatment system and process have good stability on pharmaceutical wastewater treatment.

The invention provides a method for treating algae-containing sludge water by using an oxidation flocculation precipitation combined process, which comprises the following steps: S1, adding an oxidant into the algae-containing sludge water, and conducting stirring, mixing and oxidizing to obtain oxidized effluent; and S2, adding a flocculating agent into the oxidized effluent, and conducting mixing, flocculating and precipitating to obtain supernate. The oxidant is one or a combination of chlorine, ozone, sodium hypochlorite and potassium permanganate; and the flocculating agent is one or a combination of more of PAC, PFS and PAM. The treatment method can remove protection of organic matter, algae and the like on colloidal particles in the sludge water, strengthen colloid destabilization, improve the sedimentation performance of the sludge water, form dense flocs, and reduce the turbidity of effluent, the concentration of the organic matter and pathogenic microorganisms, and meanwhile, the sludge water treated by the method greatly reduces the algae content, does not cause algae cell lysis and chlorophyll diffusion, and reduces the chromaticity.

The invention relates to a method for preparing an organic fertilizer from honeysuckle flower waste. The method is characterized in that herb residue waste, alcohol precipitation substances and water precipitation substances generated in a honeysuckle flower water-extraction and alcohol-precipitation process are taken as raw materials; after being pre-treated and mixed, the raw materials are fermented step by step by taking a group of thermophilic bacteria bacteria-solution prepared from chaetomium thermophilum and thermophilic sporotrichum and another group of a mesophile bacteria-solution prepared from paenibacillus polymyxa and bacillus licheniformis as strains; and after fermentation is ended, drying, crushing, pelletizing and packaging are performed to prepare the organic fertilizer. The honeysuckle flower waste is utilized to prepare the organic fertilizer, so that cost of treating waste is reduced, and the organic fertilizer which is easily absorbed by plant, has nutrition and plant protection effects, and increases a utilization rate of resources is further produced, and therefore, a circular economy pattern of a honeysuckle flower deep-processing industry is developed.

The invention relates to the technical field of wastewater treatment, in particular to a textile printing and dyeing wastewater treatment method. The textile printing and dyeing wastewater treatment method comprises the following steps: step 1, regulating and treating wastewater collected by a water collecting well in a regulating tank; step 2, carrying out first-stage treatment in a coagulation tank; step 3, carrying out treatment in a primary sedimentation tank; step 4, carrying out treatment in an anoxic / oxic (A / O) tank; step 5, carrying out treatment in a secondary sedimentation tank; step6, carrying out treatment in an ozone tank; step 7, carrying out treatment in a membrane bioreactor (MBR) tank; and step 8, carrying out backwashing and discharging. Through a reflux design and combination of the ozone tank, the MBR tank and a biological aerated filter tank, the textile printing and dyeing wastewater treatment method can be used to reduce the aniline concentration, the total nitrogen concentration, the organic matter concentration and the chromaticity of discharged water, and water quality can be improved. In addition, the design of large reflux gradient oxygen dissolution isadopted in the aspect of the biochemical process, namely the mixed solution discharged after treatment in the A / O tank is refluxed again so as to strength the capability of biological nitrogen and phosphorus removal.

The invention discloses a country distributed domestic sewage treating system and method. The system comprises a sewage collection tank (2), an anaerobic filter tank (1), ecological floating islands (11) and a constructed wetland (12), wherein the sewage collection tank (2) is connected with the anaerobic filter tank (1) through a water feeding pipe (3); the anaerobic filter tank (1) is connected with the constructed wetland (12) through a middle water discharging pipe (10); the ecological floating islands (11) float on the water surface of the constructed wetland (12); the constructed wetland (12) is connected with a water discharging pipe (18); the anaerobic filter tank (1) comprises parts of a sewage outlet (5), a sludge settling zone (6), a water distributing hole plate (4), a sludge suspension zone (7), elastic packing (8), the middle water discharging pipe (10) and an exhaust pipe (9) from bottom to top in sequence. The system and the method have the characteristics that the mixed liquor concentration is improved, the waterpower degree is high, blockage and power consumption are avoided, the operation management is simple and convenient, and the greening effect and the ecological effect are good; the country distributed domestic sewage treating system and method are suitable for popularization and application are facilitated.

The invention discloses a device and a method for adsorbing and pretreating coal gasification wastewater by residual sludge and application. The device comprises a shell, wherein an adsorption sedimentation area and a sludge concentration area which are arranged up and down are defined in the shell; the adsorption reactor is arranged in the shell, a muddy water outlet is formed in the upper part of the adsorption reactor, a water and mud inlet is formed in the lower part of the adsorption reactor, and the adsorption reactor divides the adsorption settlement area into an adsorption area and a settlement area; the shell is communicated with the water outlet weir through a water outlet; the partition plate is arranged in the adsorption settling area, abuts against the top wall of the shell, the side wall of the shell and the outer wall of the adsorption reactor and divides the settling area into a first settling area and a second settling area, and only the bottoms of the first settling area and the second settling area are communicated. The device not only can realize the recycling of the waste residual sludge and reduce the treatment cost of the wastewater, but also can greatly reduce the concentration of organic matters in the wastewater and improve the biodegradability of the wastewater, and in addition, the device also has the advantages of simple structure, high treatment efficiency and easiness in operation.

The invention discloses a membrane bioreactor for simultaneous anaerobic ammonia oxidation and methane production and a wastewater treatment method. The sewage is diluted and then transported to an anaerobic methane production reactor. A microbial carrier with a porosity of 10 μm and a porosity of more than 80%. The anammox bacteria on the microbial carrier are used to convert nitrite nitrogen and ammonia nitrogen in sewage into nitrogen and nitrate nitrogen after domestication, and the first return path is connected. The activated sludge aerobic zone and the activated sludge anoxic zone, the second return path connects the activated sludge anaerobic zone and the activated sludge anoxic zone, and the third return path connects the activated sludge anoxic zone and the activated sludge aerobic zone zone, the sludge mixture in the activated sludge anoxic zone can be returned to the anaerobic methanogenesis reactor, activated sludge anaerobic zone, activated sludge through the first return path, the second return path and the third return path The return port of the anoxic zone enables sewage and activated sludge to undergo three processes of hydrolysis, acidification, acid production and methane production under anaerobic conditions.

The invention relates a treatment method of vinylon water-soluble waste water. The method comprises the following steps of adjusting the pH of the vinylon water-soluble waste water to be more than or equal to 10 by utilizing alkaline liquid, adding a polyferric sulfate coagulant and natural clay minerals, stirring, adding a borax saturated solution, continuously stirring until a great amount of colloid is formed, adding the polyferric sulfate coagulant to carry out the secondary coagulation, continuously stirring for 1 to 2 minutes, standing, and separating solid from liquid. The treatment method is simple, easy to implement, high in reaction speed, remarkable in treatment effect, easy for separating solid and liquid and good in operability, organic matters in the high-concentration vinylon water-soluble waste water are high-efficiently eliminated by utilizing the flocculation of the polyferric sulfate coagulant and the adsorption effect of the natural clay minerals as well as the crosslink salting-out effect of the borax, so that not only can the load on the subsequent biochemical treatment process be alleviated, but also the separated colloid can be used as a fuel to be combusted.

The invention discloses a biosorption process device which comprises a biosorption tank, wherein the biosorption tank is communicated with a sedimentation tank, the sedimentation tank is communicated with an adjusting tank, a third gear and a driving device for driving the third gear to rotate are arranged in the sedimentation tank, a second rotating shaft is sleeved with the third gear, the outer side of the second rotating shaft is sleeved with a vertical rod, and the two sides of the vertical rod are fixedly connected with transverse rods. According to the invention, the second rotating shaft drives a spiral feeding rod to feed sludge into a sludge discharging pipe through a hose to be discharged, meanwhile, the second rotating shaft drives the vertical rod to move in the horizontal direction, a sludge scraping plate is installed at the bottom of the transverse rod, the sludge is continuously fed in the direction close to the spiral feeding rod, it is guaranteed that the spiral feeding rod always sends out the sludge, and the spiral feeding rod does circular motion along with the second rotating shaft, so that the space movement range of the spiral feeding rod is expanded, the sludge above or below the settled sludge layer is continuously sent out, and the sludge discharging speed of the sludge is increased.

The invention relates to a combined pretreatment device and pretreatment method for semi-coke wastewater. The combined pretreatment device for semi-coke wastewater comprises a collection tank, an acidregulation tank, a high-efficiency oil separating unit, a selective catalytic oxidation unit (SECO), a selective catalytic reduction-oxidation unit (SCRO) and a neutralization and sedimentation tank,wherein the collection tank is connected with the acid regulation tank; the acid regulation tank is communicated with the high-efficiency oil separating unit; the high-efficiency oil separating unitis connected with the selective catalytic oxidation unit (SECO); the selective catalytic oxidation unit (SECO) is connected with the selective catalytic reduction-oxidation unit (SCRO); the selectivecatalytic reduction-oxidation unit (SCRO) is connected with the neutralization and sedimentation tank; the selective catalytic reduction-oxidation unit (SCRO) comprises a selective catalytic reductionunit (SCR) and a selective catalytic oxidation unit (SCO); and the selective catalytic reduction unit (SCR) and the selective catalytic oxidation unit (SCO) are independent and sequentially communicate with each other. The combined pretreatment device has the advantages of simple structure and controllable operation.

The invention discloses a resourceful treatment system and method for sodium sulfate wastewater. The system comprises a collecting tank, a first pH adjusting tank, a Fenton reaction tank, a multifunctional adjusting tank, a horizontal flow sedimentation tank, a multi-stage low-temperature evaporation system, a freezing crystallization device, a sodium sulfate storage device, an incinerator and a tail gas treatment device. The method comprises the steps of (1) carrying out a Fenton reaction; (2) aerating to remove impurities; (3) mixing and precipitating; (4) conducting low-temperature evaporation; (5) conducting freezing crystallization; and (6) performing incineration treatment. The treatment system has the beneficial effects that the treatment system is simple in connection structure and easy to implement; and by means of the treatment system, effective treatment of high-concentration wastewater and low-concentration wastewater is achieved, and meanwhile, effective recovery of sodium sulfate is achieved. According to the treatment method disclosed by the invention, COD in the wastewater is effectively removed through Fenton reaction, aeration impurity removal and mixed precipitation, meanwhile, effective recovery of sodium sulfate resources is realized through low-temperature evaporation and freezing crystallization, the sodium sulfate resources can be sold as products, and the economic benefits of enterprises are improved.

The invention discloses equipment for collecting and conveying VOCs loading gas and a method for safely collecting and conveying the VOCs gas. The equipment comprises a condensing device, a mixing device, a protective gas supply device, a gas detection device, an air draft device, a gas collecting pipeline and an emptying valve, the condensing device, the mixing device, the detecting device and the air draft device are sequentially arranged on the gas collecting pipeline in series, the emptying valve is arranged at the output end of the gas collecting pipeline, and the protective gas supply device is connected with the mixing device through a pipeline. In the organic liquid loading process, the equipment can hermetically collect VOCs discharged by a tank car, monitor gas composition, reduce the concentration of organic matter through condensation, dilute the concentration of oxygen by mixing inert gas, control the concentration of mixed gas within the lower limit of gas explosion through DCS (or PLC) control, safely convey the gas to a waste gas treatment device, and achieve the purpose of waste gas treatment. And safe conveying and treatment are ensured.

The invention provides a method for treating rubber chemical wastewater by microwave enhanced microelectrolysis combined oxidation. The method is characterized by comprising the following steps: pre-oxidizing wastewater, and carrying out microelectrolysis treatment; carrying out microwave radiation after organic matters in rubber chemical wastewater are subjected to ring-opening and chain.-scission; enhancing the treatment effect of microelectrolysis and oxidation by utilizing the electromagnetic effect of microwave, and quickly heating the wastewater by means of the heat effect of microwave. According to the method, the oxidation speed can be accelerated by means of temperature rising, so that separation of organic matters can be favored, a subsequent flocculation reaction is accelerated, and the total amount of sludge of wastewater can be reduced; and multiple processes are gradually combined for rubber chemical wastewater treatment, so that discharge of the wastewater with standard level at relatively low cost can be realized.

The invention discloses a membrane bioreactor for anaerobic ammonia oxidation and methanogenesis synchronously and a waste water treatment method. The method comprises the following steps: conveying diluted sewage to an anaerobic methanogenesis reactor; inputting a microbial carrier, the pore diameter of which is 1-10 [mu]m and the porosity of which exceeds 80%, into the anaerobic methanogenesis reactor; after domestication of anaerobic ammonium oxidation bacteria on the microbial carrier, converting nitrite nitrogen and ammonia nitrogen in sewage into nitrogen and nitrate nitrogen; communicating an aerobic zone and an anoxic zone of activated sludge by a first reflux path; communicating an anaerobic zone and the anoxic zone of activated sludge by a second reflux path; communicating the anoxic zone and the aerobic zone of activated sludge by a third reflux path; refluxing a sludge mixed solution in the anoxic zone of the activated sludge to the water return ports of the anaerobic methanogenesis reactor, the anaerobic zone of activated sludge and the anoxic zone of the activated sludge through the first, second and third reflux paths, wherein three processes: hydrolytic acidification, acid production and methanogenesis of sewage and activated sludge in anaerobic conditions are carried out.

The invention relates to the field of polysilicon, and especially relates to a method for reducing organic matters on the surface of silicon blocks, and a preparation method of monocrystalline silicon. The method for reducing organic matters on the surface of the silicon block comprises the following steps: breaking a silicon ingot into a Teflon plate to form the silicon blocks, and then transporting the silicon blocks to a position over an etching container by using the Teflon plate; tilting the Teflon plate to make the silicon blocks slide into the etching container; etching the silicon blocks in the etching container, and discharging an etching liquid after the etching treatment; ad sleeving the opening of the etching container with a packaging bag, turning over the etching container tomake the etched silicon blocks directly fall into the packaging bag in order to complete the packaging. The reduction method completely realizes the gloveless operation and avoids the abrasion generated during transportation of the silicon blocks by a manipulator and the like. An experimental result shows that the reduction method of the present invention can effectively reduce the concentrationof the organic matters on the surface of the raw material silicon blocks.