201results about How to "Low mud production" patented technology

The invention discloses an aerobic-anoxic-anaerobic integrated module type fast denitrogenation reactor for sewage and a treatment method thereof and relates to an integrated sewage treatment device, which is particularly suitable for fast integrated treatment for sewage by denitrogenation technology. The device is designed for solving the problems of complex process, high treatment expense, additional carbon source and regulation of outflow pH, difficult zero discharge and the like existing in aerobic-anoxic-anaerobic denitrogenation sewage treatment. Aerobic-anoxic-anaerobic processes are technically integrated to enable sewage to be always in an alternate aerobic-anoxic-anaerobic environment; an organic carbon source, organic nitrogen and total phosphorus are distributed reasonably to avoid shortage of carbon source during denitrogenation, so that total nitrogen and total phosphorus are converted effectively, the effect of denitrogenation and dephosphorization are improved, and discharged water reaches first discharge standard of Integrated Wstewater Discharge Standard (GB8978-1996). The device is used for treating municipal domestic sewage, especially sewage of middle and small stations along railway lines.

The invention discloses a low-carbon urban sewage biological phosphorus removal and autotrophic biological nitrogen removal device and a low-carbon urban sewage biological phosphorus removal and autotrophic biological nitrogen removal method. The device comprises a raw water tank, a biological phosphorus removal and half shortcut nitrification reactor, a secondary sedimentation tank, an intermediate water tank and an anammox reactor, wherein the biological phosphorus removal and half shortcut nitrification reactor is a university of cape town (UCT) reactor without internal returning of digestive fluid; the secondary secondary sedimentation tank is a radial-flow sedimentation tank; and the anammox reactor is an upflow anaerobic sludge blanket (UASB) reactor. The method comprises: introducing urban sewage first to the anaerobic zone of the biological phosphorus removal and half shortcut nitrification reactor for phosphorus release, then to an anoxic zone of the biological phosphorus removal and half shortcut nitrification reactor for denitrification and phosphorus absorption and finally to an aerobic zone for aerobic phosphorus absorption and half shortcut nitrification; subjecting mixed liquid containing ammonia nitrogen and nitrite nitrogen to sludge and water separation in the secondary sedimentation tank; and introducing the water to the anammox UASB reactor for autotrophic biological nitrogen removal under anammox action. When the method is used, process aeration can be reduced, energy consumption can be reduced, and carbon source is saved. The method is suitable for treating low-carbon sewage.

The invention discloses a coking wastewater treatment system, including an upflow anaerobic sludge blanket reactor, an anoxic denitrification biofilter, an aerobic nitration biofilter, a multistage iron carbon micro-electrolysis coupling Fenton oxidation bed reactor, an aerobic nitration biofilter and an anoxic denitrification biofilter. A coking wastewater treatment method comprises the following steps of coking wastewater enters the upflow anaerobic sludge blanket reactor, the anoxic denitrification biofilter, the aerobic nitration biofilter, the multistage iron carbon micro-electrolysis coupling Fenton oxidation bed reactor, the aerobic nitration biofilter and the anoxic denitrification biofilter from a raw coking wastewater inlet pipe from bottom up, and is discharged. The coking wastewater treatment system disclosed by the invention has the advantages of being small in occupation area and low in energy consumption, having efficient wastewater treatment efficiency, reducing the operation cost of wastewater treatment, and being high in treatment load, low in energy consumption and small in sludge production yield.

The invention provides a method and system for deeply treating coking wastewater to decarbonize, decolor and remove cyanide. The method comprises the following steps: 1) introducing the coking wastewater into a Fenton fluidized bed, and adding a mixed solution of ferrous sulfate, sulfuric acid and water into a solution; 2) adding hydrogen peroxide into the solution of the Fenton fluidized bed and sufficiently reacting; 3) leading out a reaction solution in the Fenton fluidized bed, adjusting the pH (Potential of Hydrogen) value of the reaction solution, adding a flocculating agent, and after precipitating, taking supernatant; 4) mixing the supernatant with sodium hypochlorite, and carrying out an oxidization reaction; and 5) adjusting the pH of the reaction solution, and carrying out adsorption treatment by active carbon to obtain a deeply treated water body. According to the method and the system, the Fenton fluidized bed, flocculation and sedimentation, sodium hypochlorite oxidization, and active carbon filtering and adsorption are effectively combined; the Fenton fluidized bed and the flocculation and sedimentation are carried out, residual cyanide in output water mainly exists in a CN<-> form, the oxidization efficiency of the sodium hypochlorite is higher, and the cyanide can be removed; and the adsorption effect of the active carbon is combined, so that the water concentration of the output water is lower.

The invention relates to a method for oxidative degradation of organic pollutants in water by compounding a heterogeneous iron-based material with sulfite under an aeration condition. According to the invention, the oxygen content of a water body is increased through air aeration or oxygen aeration of the water body; the iron-based material and sulfite are added into the water body; and a series of reactions are carried out so as to produce active oxidizing agents like free sulfate radicals, free hydroxyl radicals and free monopersulfate radicals for degradation of organic pollutants. The method provided by the invention is efficient, economic, green, simple and wide in an application scope, ensures standard-reaching discharge of refractory organic wastewater produced in industrial production, and can guarantee water supply safety for aquatic products with organic contaminated water as a water source.

The invention discloses a device and method for realizing high-efficiency and low-consumption nitrogen and phosphorous removal of municipal sewage and belongs to the field of biological treatment of sewage and sludge. Sewage in a raw water tank sequentially enters an anaerobic zone and an aerobic zone of a reactor for enhanced biological phosphorus removal and whole-process nitrification through awater feeding pump; anaerobic phosphorus release is performed in the anaerobic zone; whole-process nitrification and aerobic phosphorus absorption effects are carried out in the aerobic zone; subsequently, the sewage is drained into a settling pond, supernate enters a reactor for fermentation coupling, short-cut denitrification and synchronous anaerobic ammonium oxidation of excess sludge. The excess sludge is quantitatively fed into the reactor for fermentation coupling, short-cut denitrification and synchronous anaerobic ammonium oxidation of the excess sludge each day; short-cut denitrifying bacteria transform nitric nitrogen into nitrite nitrogen by using organic matters produced by hydrolysis and fermentation of the sludge; anaerobic ammonium oxidizing bacteria transform excess ammonia nitrogen and nitric nitrogen into nitrogen. According to the device and the method disclosed by the invention, deep nitrogen and phosphorus removal of the municipal sewage is realized by using an enhanced biological phosphorus removal process, a short-cut denitrification process and an anaerobic ammonium oxidation process; moreover, sludge reduction is realized by the hydrolysis and fermentation effects of the sludge, so that energy conservation and consumption reduction are realized.

The invention relates to a sewage treatment method. The method is as below: sending domestic sewage into an oil separator through a machinery grating, and then sending the sewage into a hydrolysis-acidification pool to decompose macro-molecular organic matters in the sewage into micromolecular organic matters, so as to remove part of COD; sending the sewage into a primary settling tank to concentrating sludge and discharging the sludge into a sludge storage tank; sending an upper clarified liquor into an anoxic biochemical pool; carrying out an denitrification reaction on the sewage and a nitrated liquid flowing back from an aerobic biochemical pool; introducing effluent into the aerobic biochemical pool for aerobic biochemical reaction, and sending the other part of the sewage into a secondary settling tank through an overflow weir; concentrating the sludge, discharging the sludge into the sludge storage tank and flowing the upper clarified liquor into a clear water tank; part of the sludge in the sludge storage tank flows back to the hydrolysis-acidification pool; and conveying clear water to a biological active carbon reactor, flowing outlet water into an ozone contact pool and disinfecting the water outlet for reuse. The method has stable treatment effect, generates a small amount of sludge; residual sludge returns to the nature; and treated sewage is reused in water-scenery and greening, so as to save sewage charge and reduce environmental pollution.

The invention discloses a method for treating heavy-metal-containing wastewater by an external electric field reinforced micro-electrolysis technology, and belongs to the fields of water treatment technologies and recycling. In the method, the heavy-metal-containing wastewater is pretreated or not pretreated and then introduced into an external electric field reinforced micro-electrolysis reactor to be treated, a micro-electrolysis filler is filled in the reactor and is put in an external electric field with certain intensity, and micro-electrolysis reaction is promoted and reinforced through the reinforcing effect of the external electric field, so that metal ions in the wastewater are reduced into metal simple substances on the surface of the filler, and effluent can meet the requirement of the wastewater emission standard or can be directly recycled in the production process. The method has the advantages of high reaction speed, removal rate, recycling efficiency and environment compatibility and the like.

The invention discloses an efficient AOAS integrated sewage treatment device and a process thereof. The efficient AOAS integrated sewage treatment device comprises a main body treatment facility, an aeration system and an automatic control system, wherein the main body treatment facility comprises an water feed pump at an inlet, and an anaerobic hydrolysis tank, a first stage reaction sedimentation tank, a second stage reaction sedimentation tank and an efficient flocculation and sedimentation tank, which are communicated in sequence through water flow; the aeration system comprises a blower, an air supply connecting pipeline and aeration plates respectively arranged at the bottoms of the first stage reaction sedimentation tank and the second stage reaction sedimentation tank. According to the device and the process disclosed by the invention, intermittent aeration, continuous water inflow, alternative aerobic environment and anaerobic environment are applied to a biochemical pool, thus the denitrification is obvious in the anaerobic environment; a reaction area and a sedimentation area are integrated in the biochemical pool and are divided by a division plate, so that no sedimentation tank needs to be additionally constructed, and no sludge reflux device is arranged; the biochemical reaction and sedimentation are integrated in the same pool structure, which breaks the inherent mode that two sedimentation tanks are separate from the biochemical pool, and thus the building is simpler; the operation of the inclined tube sedimentation tank is more stable.

The invention discloses a synchronous denitrification and dephosphorization sewage treatment device for an immobilized microorganism CASS (cyclic activated sludge system). The synchronous denitrification and dephosphorization sewage treatment device comprises a pond. A water inlet tube is arranged at one end of the pond, a water outlet tube is arranged at the other end of the pond, a hollow gridding reaction box is disposed in the pond, immobilized microorganism carriers are arranged in the hollow gridding reaction box, and an aeration device is arranged at the bottom of the pond. The synchronous denitrification and dephosphorization sewage treatment device aims to overcome shortcomings in the prior art, is simple in structure, and is efficient and stable.

The invention belongs to the technical field of environmental protection and particularly relates to an energy-saving and emission-reducing town sewage treatment system. The energy-saving and emission-reducing town sewage treatment system provided by the invention comprises a strengthened pre-treatment system, a self-suction jet biological aerated filter system, a composite fluidized-bed biomembrane reaction tank system, a sludge treatment and refluxing system and a winter heat insulation system and is realized by a sewage lifting technology or sewage self-flowing process. According to the system, a novel anaerobic sewage treatment technology, an activated sludge process and a novel aerobic biomembrane-process treatment technology are organically combined, so that the advantages of small floor area, small investment, low energy consumption and simplicity and convenience in maintenance management are achieved; the sewage treatment system disclosed by the invention can be applied to town sewage treatment, and treated outlet water can stably reach the standard A of first-level standard of discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002).

The present invention discloses a compound purifying method and device of cultivation wastewater which is accomplished by the following processes. The deposited cultivation wastewater after filter seeps through deadwood to carry through anaerobic and denitrogenating treatment and then seeps through bamboo charcoal and limestone to carry through aerobic aeration treatment; after internal electrolysis treatment and absorption treatment, the wastewater purifying is accomplished and the wastewater is discharged. The device system has no machinery and is simple and convenient to maintenance. Workers after simple training can self operate and maintain. The present invention aims at the characteristic of high COD, total nitrogen, total phosphorus and solid suspended substances content of cultivation wastewater. The present invention has designed a distributed treatment flow and has the advantages of simple device, easy acquisition of material and easy maintenance. The present invention can solve the purifying problem of cultivation wastewater in culturing farms with small or medium scale.

The invention discloses a treatment method for dyeing and printing effluent. The method comprises the steps of primary settlement, filtration, hydrolytic acidification treatment, anaerobic treatment, oxidation treatment, coagulation decolorization treatment, photocatalytic treatment, activated carbon adsorption and ultrafiltration treatment. According to the treatment method for the dyeing and printing effluent, through effective combination of multiple technologies, the dyeing and printing effluent can be effectively treated, the effluent COD is smaller than or equal to 20 mg / L, the effluent BOD is smaller than or equal to 5 mg / L, the effluent SS is smaller than or equal to 5 mg / L, the sludge output is low, the effect is stable, the water quality meets 'The reuse of urban recycling water-Water quality standard for urban miscellaneous water consumption'(GB / T 18920-2002), and treated water can be applied to community and garden greening, road watering and the like.

The invention provides a domestic sewage treatment device and method by intermittent aeration contact oxidation process, wherein the device comprises a regulating reservoir (or water collecting tank), an naerobic pool, an intermittent aeration contact oxidation pool, a deposition pool and pipe-lines, water pumps for connecting these pools, a bagger is arranged on the extremity end of the intermittent aeration contact oxidation pool. The intermittent aeration contact oxidation pool can be charged with agents on the tail end as required, the sludge in the bagger returns to the anaerobic pool for treatment.

The invention discloses a tanning synthetic wastewater treatment system and treatment method, and belongs to the technical field of industrial wastewater treatment. The treatment system comprises a regulating tank, an anaerobic tank, a preaeration tank, a primary sedimentation tank, a first-level denitrification tank, an aerobic tank, a secondary sedimentation tank, a second-level denitrification tank, a coagulative precipitation tank, a Fenton oxidation tank and a biological aerated filter. According to the wastewater treatment method, tanning synthetic wastewater is treated by combining biochemical treatment with deep treatment, the wastewater treatment efficiency is high, and effluent is stable in quality and can be directly drained; in addition, the wastewater treatment cost is significantly reduced, and therefore the method is suitable for large-scale application and popularization and has the wide application prospect.

The invention discloses a freshwater compound microorganism substrate modifier, and belongs to the field of biotechnology in freshwater aquaculture. The substrate modifier is formed by mixing and uniformly stirring bacillus natto powder, lactic acid bacteria powder, clostridia butyricum powder, a biological flocculant and an oxygen producer. According to the substrate modifier disclosed by the invention, after organic pollutants in aquatic water are flocculated to form bottom mud by virtue of flocculating effects of the biological flocculant, organic flocculate in the bottom mud is decomposed by virtue of strong decomposition of aerobic bacteria, facultative anaerobe and strict anaerobe, so that the quality of the bottom mud of the freshwater aquatic water is improved; and the freshwater compound microorganism substrate modifier has the characteristics of biodegradability, safety, efficiency, no toxicity and no secondary pollution.

The invention discloses a device and method of urban domestic sewage treatment by strengthened nitrifying-DEAMOX biofilm process, and belongs to the technical field of biological sewage treatment. The device is mainly composed of a raw water tank, a strengthened nitrifying biofilm SBR, a middle water tank, a DEAMOX biofilm SBR and an effluent tank which are in connection in sequence. Urban domestic sewage enters the strengthened nitrifying biofilm SBR first, nitrate of the last cycle is removed by the prepositive anoxic stirring, and the complete nitrification is conduct through the subsequent aeration; effluent with nitrate and the urban domestic sewage enter the DEAMOX biofilm SBR together for denitrification, meanwhile, the nitrate generated through anaerobic ammonia oxidation is reduced to nitrite by shortcut denitrification bacteria, and the nitrite is removed through in situ anaerobic ammonia oxidation. According to the device and method, the problems of low denitrification efficiency of the urban domestic sewage and high effluent TN are solved, carbon source in the domestic sewage is taken full advantage of, and the additional carbon source consumption is reduced; in addition, on the basis of fast reaction rate of DEAMOX biofilm process and high total nitrogen removal rate and denitrification load, the advanced denitrification of the urban domestic sewage can be achieved.

The invention relates to a pharmaceutical wastewater treatment system and in particular relates to a comprehensive treatment system for fermented antibiotic pharmaceutical wastewater. The system can be used for pre-treatment, biochemical treatment and advanced treatment of fermented antibiotic pharmaceutical wastewater, so that the stability of the anaerobic system is improved, the anaerobic investment is reduced, the anaerobic efficiency is improved, and moreover, in the advanced treatment stage, hardly degraded pollutants are removed through Fenton catalytic oxidation reaction, so that the wastewater is discharged by reaching the standard.

The invention discloses an integrated deep domestic sewage treatment facility which comprises a tank body, and an anoxic biochemical region, an aerobic biochemical region and an anaerobic biochemical region which are respectively distributed on the left, in the middle and on the right of the cross section of the tank body, wherein the anaerobic biochemical region and the aerobic biochemical region are communicated with each other only through the bottoms; the top liquid level of the aerobic biochemical region is higher than the top liquid level of the anoxic biochemical region; the top of the aerobic biochemical region is provided with a water outlet pipe extending into the aerobic biochemical region, and an overflow weir communicated with the anoxic biochemical region; the upper part liquid level of the anoxic biochemical region is higher than the upper part liquid level of the anaerobic biochemical region; the bottom of the anoxic biochemical region is communicated with the upper part of the anaerobic biochemical region through a gravity pipeline; the tank body is provided with a water inlet pipe communicated with the anaerobic biochemical region; the bottom of the aerobic biochemical region is provided with an aerator; the top of the aerobic biochemical region is provided with a biochemical water outlet and a precipitation tank water inlet pipe which are communicated to a precipitation tank; the precipitation tank is communicated with a sand filter tank through a sand filtration lifting water pump mechanism; and a back flush dynamic drift sand filter is arranged in the sand filter tank. The invention also discloses a sewage treatment method using the facility.

The invention discloses a copper-containing printed circuit board wastewater treatment method which specifically comprises the following steps: step 1, pumping copper-containing printed circuit boardwastewater, which contains copper complex, into a reaction kettle by using a pump, and adjusting the pH value of the wastewater, step 2, adding a complex breaking agent into the reaction kettle, carrying out complex breaking reaction on the complex breaking agent and the wastewater copper complex, and stirring for 30-40 minutes; step 3, adding an oxidizing agent into the reaction kettle, carryingout enhanced reaction on the oxidizing agent and the wastewater copper complex, and stirring for 30-40 minutes; 4, adjusting the pH value of the wastewater, adding a precipitant, carrying out precipitation reaction on the precipitant and the wastewater copper complex, and stirring for 20-30 minutes; and step 5, regulating the pH value of the wastewater, adding a flocculating agent, stirring for 5-10 minutes, precipitating and standing for 2-3 hours. The invention solves the problems of high cost and poor precipitation effect in the existing wastewater treatment method.

The invention relates to a method for deep treatment of ammonian sewage, and the method belongs to the technical field of the environment protection. The invention conducts integration and innovation based on the traditional ammonian sewage treatment method and combines the physical, chemical and biological treatments, namely, an improved oxygen-poor and aerobic technique, film separation and biological treatment are adopted in the treatment of the eutrophic water which is low in BOD5, and then the eutrophic water is discharged or reused after the treatment under the standard. The invention has the advantages of low capital construction and work, good water treatment, no secondary pollution and state discharge standard conformity of the discharged water, etc., thereby being widely used in the treatment of the eutrophic water with the density of the BOD5 being 48.5mg / L.

The invention discloses a sludge-water separate discharging method for strengthening stable operation of an aerobic granular sludge process and belongs to the field of sewage treatment. According to the method, in a flocculent activated sludge inoculated reactor, municipal wastewater is taken as inlet water, a sludge-water-separate-discharging sludge discharging manner is adopted, sludge age (SRT) is taken as a regulating and controlling index, and the reactor achieves sludge granulation and stable pollutant removal efficiency under the condition of low-concentration inlet water. System sludge concentration (MLSS) is stabilized to be higher than 10g / L, and yielding water COD (Chemical Oxygen Demand) and ammonia nitrogen removal rate reach over 90%.

The invention provides a method and a device for treating chemical wastewater with high salt content and high organic matter content, and belongs to the technical field of sewage treatment. The methodcomprises the following steps: 1) dividing production wastewater into high salinity wastewater, low salinity wastewater, alkaline wastewater, acidic wastewater and oily wastewater; (2) adding the acidic wastewater into the high-salinity wastewater and the oily wastewater subjected to air floatation treatment in an acid regulating tank to regulate the pH value to be less than 7, carrying out Fenton tower and a degassing reaction, adding the alkaline wastewater to regulate the pH value to be 7, adding PAM to perform a coagulation reaction and precipitation, and collecting sludge and an overflowliquid; 3) pumping the overflow liquid into an evaporator to remove salts; and 4) mixing the evaporated wastewater with the low salinity wastewater, carrying out biochemical treatment, namely anaerobic treatment, anoxic treatment, aerobic treatment and secondary sedimentation, and carrying out the coagulation reaction and sedimentation to obtain standard-reaching effluent. The method successfullysolves the problem of treatment of the chemical wastewater with high salt content and high organic matter content, does not generate biochemical sludge, and has the characteristics of low operating cost, and stability in operation.

The invention relates to an active iron purifier and bank slope wetland system coupled purifying culture pond drainage system and a drainage method. The system is structurally characterized in that a trash rack and a filter screen are arranged at an inlet of a drainage pipe of a culture pond, the lower end of the drainage pipe is provided with three-way pipes which are communicated with active iron purifiers, a water outlet pipe of each active iron purifier is communicated with a water permeable pipe which is buried inside a gravel bed, a non-sand concrete partition A is arranged between the gravel bed and a bank slope subsurface wetland, and a non-sand concrete partition B is arranged between the bank slope subsurface wetland and a river channel. A water outlet pipe valve is arranged on the water outlet pipe of each active iron purifier, a flushing drainage pipe valve is arranged on the drainage pipe at the bottom of the active iron purifier, and the flushing drainage pipe valve is connected with a flushing drainage pipe which is connected into a sludge well. The drainage system and the drainage method have the advantages that active iron and anaerobes are coupled to be in concerted reaction so as to degrade antibiotics in drained water of the culture pond; a bank slope is utilized fully, cost of capital construction is lowered, and the gravel bed and the bank slope subsurface wetland have good purification effect on outlet water.

The invention discloses a double-oxidation device and method for advanced treatment of electroplating wastewater, and belongs to the technical field of wastewater advanced treatment processes. The double-oxidation device for advanced treatment of electroplating wastewater comprises an electro-catalytic Fenton oxidation unit and a narrow-channel electrochemical oxidation unit which are sequentiallyconnected in series, wherein an anode of the narrow-channel electrochemical oxidation unit is a microporous tubular membrane electrode with a titanium-based ruthenium dioxide eutectic structure. Thenarrow-channel electrochemical oxidation unit is connected in series behind the electro-catalytic Fenton oxidation unit, so that a complex formed by iron and an organic acid organic matter degradationintermediate is subjected to complex breaking at the anode of narrow-channel electrochemical oxidation, and the COD removal efficiency is improved; meanwhile, aiming at the electroplating wastewater,the anode of the narrow-channel electrochemical oxidation unit adopts the microporous tubular membrane electrode with the titanium-based ruthenium dioxide eutectic structure, so that strong acid corrosion is avoided, hypochlorous acid can be formed to generate a synergistic oxidation reaction with electro-catalytic Fenton oxidation, and the COD removal efficiency is further improved.

The invention provides an industrial sewage treatment device comprising a shell, a central cylinder, a supporting filter board, a filler inside the central cylinder, a water distributor, a water collector, a water collection groove, a water outlet pipe, a water inlet pipe, a chemical feed pipe, and a sludge discharging or emptying pipe. The industrial sewage treatment device is characterized in that a stirring paddle, the water distributor and the iron carbon filler are arranged inside the central cylinder in the shell; the stirring paddle is connected with a transmission shaft of a stirring motor fixedly arranged at the top of the shell; the iron carbon filter and the bottom of the central cylinder are located on the supporting filter board; and the water inlet pipe is connected with the water distributor. One end of the water outlet pipe is connected with the water collection groove around the upper part of the central cylinder, and the other end of the water outlet pipe penetrates through the shell and is led out. The chemical feed pipe connected with the water inlet pipe is connected with equipment for adding hydrogen peroxide outside the shell. Ultraviolet lamp tubes are uniformly arranged on the circumference of the middle part of the central cylinder. The industrial sewage treatment device has the advantages that the structure is reasonable and compact, the iron-carbon micro-electrolysis technology is organically combined with a hydrogen peroxide oxidation Fenton treatment technology and an ultraviolet treatment technology, so that the good quality of outgoing water and the high efficiency can be realized.

The invention relates to industrial wastewater treatment, particularly a device for removing hypophosphites and phosphites by an advanced oxidation coupling technique in industrial wastewater treatment. The invention provides the device for removing hypophosphites and phosphites by an advanced oxidation coupling technique, which comprises a I stage reaction pond, a II stage reaction pond, a hydrogen peroxide injection device, an ozone injection device and a ferrous sulfate injection device. The I stage reaction pond is in communication with the II stage reaction pond. The I stage reaction pond is provided with a water inlet. The ozone injection device is connected to the I stage reaction pond. The ferrous sulfate injection device is connected to the II stage reaction pond. The ozone injection device is connected to the II stage reaction pond. The device provided by the invention has the advantages of high reaction speed, favorable removal effect, simple technical process, no need of regulating pH value, and low sludge production quantity.

The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device and a sewage treatment method for a self-cleaning type micro-aeration vertical baffled wetland. The invention discloses the sewage treatment device for the self-cleaning type micro-aeration vertical baffled wetland. The sewage treatment device consists of a water distribution region, a tank body and a water collecting region; to-be-treated sewage flows into the water distribution region through a water inlet tube, and then flows from the distribution region into the tank body by taking an overflow; outlet water treated by the tank body flows into the water collecting region by taking an overflow; and the tank body is formed by connecting a plurality of stages of vertical baffled wetlands with different treatment functions in series, in a water flow direction, namely an anaerobic wetland, a carbon oxidization wetland and a short-cut nitrification-denitrification wetland. The invention further provides a sewage treatment method by adopting the device. According to the device provided by the invention, the tank body is divided into an anaerobic section, an aerobic section and a micro-aerobic section in the water flow direction, and efficient removal of carbon pollutants and nitrogen pollutants can be realized; and the problems that a conventional constructed wetland is too low in dissolved oxygen, relatively great in land area, easy to block by stuffing and difficult to clean after being blocked are solved.

The invention discloses a method for methane production and efficient deep denitrification of urban sewage, and belongs to the technical field of biological treatment of sewage. Municipal sewage firstenters an anaerobic membrane bioreactor, granular sludge converts organic matters in the sewage into methane, and the sludge and dissolved methane are intercepted by a membrane module, so that the collection rate of methane gas is improved, and the dissolved methane in the effluent is reduced as a greenhouse gas for release; the effluent enters a short-range denitrification coupled anaerobic ammonia oxidation reactor together with nitrifying liquid refluxed from a nitrification reactor, and the granular sludge reduces nitrate nitrogen to nitrite nitrogen, and converts the nitrite nitrogen andpart of ammonia nitrogen into nitrogen; next, the effluent enters a short-range nitrification anaerobic ammonia oxidation reactor, and the granular sludge converts part of the ammonia nitrogen into nitrite nitrogen, and then converts the nitrite nitrogen and part of the ammonia nitrogen into nitrogen; the sewage finally enters the nitrification reactor, and the granular sludge oxidizes the nitrite nitrogen and the ammonia nitrogen into nitrate nitrogen, thereby achieving the purpose of deep denitrification.

The invention discloses a denitrification technology for printing and dyeing wastewater. The technology comprises steps as follows: step 1, a denitrification system for the printing and dyeing wastewater is established and comprises an anaerobic hydrolysis tank, a low-oxygen tank, an aerobic tank and a denitrification filter which communicate with one another sequentially; step 2, the to-be-degraded printing and dyeing wastewater enters the anaerobic hydrolysis tank from a water inlet of the anaerobic hydrolysis tank, 5%-10% of sewage after hydrolysis directly enters the denitrification filter, and residual sewage flows into the low-oxygen tank; step 3, the sewage flows into the aerobic tank for denitrification treatment via the low-oxygen tank, residual sludge produced by the aerobic tank and a nitrification liquid flow back to the anaerobic hydrolysis tank in the ratio being 25%-35%, and the residual nitrification liquid flows into the denitrification filter; step 4, a sludge and water mixture obtained through backwashing by the denitrification filter also flows back to the anaerobic hydrolysis tank in the ratio being 15%-25%, and residual sewage is discharged out of the system after denitrification filtration. The technology has the advantages of good treatment effect, low sludge yield, small occupied area of the system and low operation cost.