318results about How to "Promote denitrification" patented technology

The invention relates to a hydrogenation catalyst with active metal component concentration in gradient increase and distribution and a preparation method thereof. The preparation method comprises the following steps of: mixing compounds of metal in VIB and/or VIII family with deionized water or ammonia to prepare a metal impregnating solution by using Al2O3 or Al2O3 containing SiO2, TiO2 and ZrO2 as a vector; preparing the hydrogenation catalyst by using a saturated impregnation method; gradually adding denser metal solution for saturated impregnation of the vector by preparing more dilute solutions of metal in VIB and/or VIII family or deionized water; or impregnating the vector first with the metal impregnating solution with low concentration and then with the metal impregnating solution with high concentration by preparing metal solutions of different concentrations; drying for 1 to 8 hours at 80 DEG C to 150 DEG C; and baking for 2 to 6 hours in an air of 300 DEG C to 650 DEG C. The catalyst has the advantages of high desulfurization, denitrification, residual carbon removing activity and stability, simple preparation and lower preparation cost and is suitable for the field of heavy oil hydrogenation.

The invention discloses a treatment method for biological nitrogen removal of reinforced sewage, which comprises the following steps of: 1, feeding all or partial treated sewage and sludge refluxed from a secondary sedimentation tank into a reflux sludge denitrification unit together by adopting division point inflow; 2, feeding the outflow of the reflux sludge denitrification unit and the residual sewage to an anaerobic unit or an anoxic unit; 3, feeding the outflow of the anaerobic unit to the anoxic unit, and refluxing the mixed solution of an aerobic unit to the anoxic unit; 4, feeding the outflow of the anoxic unit to a transition unit; 5, feeding the outflow of the transition unit to the aerobic unit, and refluxing the mixed solution of the aerobic unit to the anoxic unit from the outflow end of the aerobic unit; and 6, feeding the outflow of the aerobic unit to the secondary sedimentation tank to perform sludge-water separation. The method can be operated in multiple modes of A-A2O, nitrogen removal AO, inverse AAO and the like and has high controllability, and a system has strong nitrogen removal capability. The method is suitable for upgrade and reform of newly built sewage treatment plants of towns lacking the land and the conventional sewage treatment plants.

The invention belongs to the field of rice cultivation, and particularly relates to a cultivation method suitable for no-tillage rice in a fixed compartment of an oil crop-medium rice field. The cultivation method comprises the following steps that: (1) rice seeds are coated by using dry-raised nurse, thick mud and dry fine soil serving as coating agents, wherein the components comprise 7.9 to 12.5 percent of dry-raised nurse, 25 to 26.3 percent of rice seeds, 12.5 to 13.2 percent of thick mud with 37 percent of water content and 50 to 52.6 percent of dry fine soil with 3 percent of water content in percentage by mass; the rice field is finished as required and the soil moisture is kept; and keeping the seedling age at 15 to 18 days; (2) the compartment width of the oil crop field is 1.2 meters, the width of the ditch is 0.3 meter, and the depth of the ditch is 0.25 meter; the rape seedlings are applied to the field; a ternary compound fertilizer of which pure nutrients comprise 15 percent of N, 15 percent of P2O5 and 15 percent of K2O is applied, and 30 kilograms of pure nitrogen is applied in each mu; 5.80 kilograms of zinc is applied in each mu; and 4.8 kilograms of boron fertilizer is applied in each mu, and the ditch is kept full of water; (3) rice seedlings with 50 to 100 grams of soil in each seedling in 15 to 18 days are directionally thrown according to a row space of 20 centimeters; and (4) the ditch is kept with water and the compartment surface has no water after throwing the seedlings till the heading stage, and dry and wet alternated cultivation is adopted from the grain filling stage to the maturation stage. Compared with the conventional method, the yield is averagely increased by 8.7 percent.

The invention discloses a sludge dephosphorizing and denitrifying biological disposing method, which comprises the following parts: adsorbing pool, sedimenting pool, regenerating pool, selecting pool, dephosphorizing pool, nitrated pool, denitrifying pool and hydrolytic acidifying pool, wherein the effluent enters in the adsorbing pool firstly to blend with reflux sludge in the selecting pool; the blending liquid is drained from adsorbing pool to sedimenting pool to separate mud from water; the supernatant enters into nitrated pool to denitrify in the denitrifying pool to drain; the sediment part of sludge is proceeded anaerobic hydrolysis in the hydrolytic acidifying pool; the supernatant is inputted into dephosphorizing pool to proceed chemical dephosphorizing; the other part of sediment pool refluxes sludge into selecting pool under anaerobic environment; the composite liquid from selecting pool is input in the regenerating pool; the other part supernatant from dephosphorizing pool is input in the denitrifying pool to accelerate denitrifying action.

A method and apparatus in which in a biological treating system for organic wastewater, not only is phosphorus, etc. efficiently recovered as MAP crystal from a wastewater containing organic matter, phosphorus and nitrogen but also the biological denitrification/dephosphorization treatment capability is strikingly improved. There is provided a method of treating sludge generated in the process for biological treatment of organic wastewater utilizing microbial metabolism, characterized in that a biological treatment composed mainly of acid fermentation by facultative anaerobes is carried out with the sludge to thereby leach phosphate ion and ammonium ion from the sludge; a magnesium source is added to the sludge to thereby form grains of magnesium ammonium phosphate from the leached phosphate ion and ammonium ion; and grains of magnesium ammonium phosphate are separated from the sludge containing formed grains of magnesium ammonium phosphate. Further, there is provided an apparatus for carrying out the method.

The invention discloses real-time control device and method for the deep denitrification and dephosphorization of an A2/O-BAF (Biological Aerated Filter) process. The A2/O-BAF real-time control device mainly comprises a raw water tank (1), an A2/O reactor (2), a secondary sedimentation tank (3), a BAF reactor (4) and a real-time control system (5). The real-time control method comprises the following steps of: collecting the concentrations of ammonia and nitrogen in a water outlet tank on line and obtaining a real-time control variable through the operation of a computer; adjusting the aeration amount of an air pump through a stroke controller; collecting the concentration of nitrate nitrogen in the water outlet tank on line and obtaining a real-time control variable through the operationof the computer; adjusting the reflux ratio of a peristaltic pump through the stroke controller; collecting the concentration of TP in the water outlet tank on line and obtaining a real-time control variable through the operation of the computer; and adjusting the reflux ratio of the peristaltic pump through the stroke controller. The invention overcomes the limitations of a traditional biological phosphorus and nitrogen removal process of sewage and is one of the most effective methods for the synchronous phosphorus and nitrogen removal of C/N sewage.

The invention relates to a staged membrane bioreactor device, for treating sewage or micro-polluted source water, with a water container, pertaining to the environmental protection technology field. The device consists of a half-reaction zone, an anaerobic reaction zone, an aeration reaction zone and a pure water zone. The half-reaction is communicated with the bottom of the aeration zone, the bottom of the half-reaction is provided with an empty valve, one side of the half-reaction zone has a water inlet pump, the inside of the half-reaction has an internal ring filled with stuff, and the top of the half-reaction is provided with a stirrer, and the effluent of the half-reaction automatically flows into the anaerobic reaction zone. The top of the anaerobic reaction zone is provided with a stirrer, the bottom thereof is provided with a sludge empty valve, and a sludge empty device is shaped like a horn mouth and positioned in the anaerobic reaction zone, and the top of the anaerobic reaction zone is provided with a drug feeding mouth. The bottom of the aeration reaction zone has an internal return pump, the lower part of the aeration reaction zone is provided with an aeration pipe with an air inlet positioned at one side of the aeration reaction zone, and a fan is connected to the aeration pipe through the air inlet; the top of the aeration reaction zone is provided with an overflow pipe, the bottom of the aeration reaction zone is provided with an empty valve, while the middle is provided with a membrane component. The pure water zone is divided into two units, and the inside of each unit is provided with an effluent valve. The invention has the advantages of good effluent quality, multi purposes, small land occupancy, flexible and convenient using method, and is applied to the treatment of domestic sewage and micro-polluted source water, and can widen and facilitate the application of membrane bioreactor water treatment and water resource reutilization technique.

The invention discloses a sewage treating device with a multiple water inlet point multi-grade bioflim reactor. N pieces of separating plates are vertically arranged inside a tank to divide the tank into N+1 reaction pools in series. The adjacent reaction pools are orderly communicated with the lower part to the upper part, wherein, the first N-1 grades are functioned with anaerobic and aerobic reaction alternately, every pool is provided with flexible assembled fillers; the N grad is the aerobic reaction area with flexible assembled filler, and the N+1 grad is the filtering and depositing area; a water inlet pipe is arranged at the top of the tank and is respectively communicated with the water inlet of the first N-1 grades, applying a water supply with multiple points; a water outlet pipe is led out of the upper part of the N+1 grade reaction pool; the bottom parts of the first N grade reaction pools are provided with an underwater aeration device, and the bottom part of the N+1 grade reaction pool is provided with a backwashing pipe. The bottom part of every pool is provided with a sludge discharge pipe. The treatment device has the advantages of great impact loading resistant ability, high treatment efficiency, low operation energy consumption, less left sludge, simple procedure, small land occupation, low investment and convenient operation.

The invention discloses a distributed domestic sewage treatment method. The method combines process units of anaerobic, jet oxygenation, biological oxidation, artificial wetland and the like together to perform anaerobic, aerobic and wetland ecological three-stage treatment on the domestic sewage so as to effectively reduce CODcr and BOD5 of the domestic sewage; and dephosphorization and denitrification are performed, and the effluent is stable and reaches the standards before emitting. A jet oxygenation pulse water distributor is adopted in the jet oxygenation, and the jet oxygenation pulse water distributor oxygenates the anaerobic effluent and provides pre-oxygenation treatment for a subsequent aerobic process; the biological oxidation is performed in a trickling filtration tower which is designed with 2 to 3 layers and provided with vent holes, a ceramic filler is placed in the trickling filtration tower, and the trickling filtration tower distributes water by adopting time control pulse so that the re-oxygenation effect of the trickling filtration tower can be improved and no power is consumed; and the artificial wetland is designed in an undercurrent form, proper fillers such as coal cinder, plaster, gravels and the like are placed in the artificial wetland, and pollutants can be further degraded and removed from the wetland environment. The method is suitable for standard-reaching treatment of rural or urban distributed domestic sewage.

The invention relates to a process for enhancing denitrogenation of a membrane bioreactor by anaerobic fermentation acid production. The process adopts an enhanced anaerobic tank, an anoxic tank and an aerobic tank. After entering the process, the sewage undergoes biochemical treatments including anaerobic fermentation, anaerobic denitrification and aerobic nitrification under the action of different kinds of microorganisms, and finally the effluent is sucked and collected by membrane filtration. By optimizing the growth environment of microorganisms in the anaerobic section, the process, on the one hand, promotes hydrolysis acidification of particle-stage organic matters (including colloid-state organic matters), slowly-degradable organic matters and hardly-degradable organic matters in the raw sewage, and on the other hand, produces acids from the excessive activated sludge which is discharged to the anaerobic tank to provide high-quality carbon sources for anaerobic denitrification. Besides, the process enhances the biological denitrification process by increasing sludge concentration, solves the problem of insufficient carbon source in biological denitrification process, and achieves the purpose of removing total nitrogen from the sewage with high efficiency by virtue of high-efficiency cut-off and separation characteristics of the membrane. The process can supplement carbon sources to the denitrification section for enhanced denitrogenation by fully utilizing converted carbon sources in the incoming water and carbon sources generated by sludge fermentation in the process without needing extra carbon sources. The process is simple and flexible in control, and the total nitrogen in the effluent can reach or exceed the first-class (A-class) discharge standard.

The invention belongs to the technical field of biological filter beds, and particularly relates to a multi-stage aerobic-anaerobic compound biological filter bed, comprising a water inlet pipe and more than two stages of filter beds; the height of a liquid level of each stage of the filter bed is gradually reduced and each filter bed is divided into a water inlet groove, a filtering chamber and a water outlet groove by rectification walls; each filtering chamber is filled with filler layers; the grain diameters of fillers of the filler layers at the two sides are great and the grain diameters of the fillers of the middle filler layer are small; the grain diameters of the fillers of the middle filler layer are sequentially reduced according to the stages of the filter beds; a water outlet end of the water inlet pipe is arranged at the bottom of the water inlet groove of the foremost stage of the filter bed and the bottoms of the water outlet grooves of the upper and lower stages of the filter beds are communicated through a siphon; the bottom of the water outlet groove of the final stage of the filter bed is connected with a water discharging groove; the middle filler layer is internally provided with a ventilated vertical pipe, a ventilated main pipe and a ventilated branch pipe; the ventilated branch pipe is provided with air vents at intervals and plants which can degrade pollutants are planted at the upper parts of the filler layers. With the adoption of the structure, the multi-stage aerobic-anaerobic compound biological filter bed provided by the invention has the advantages of small occupied area, convenience for construction, lower cost, wide application range and the like.

The invention relates to a filtration-fabric anti-clogging strengthening compound flow constructed wetland domestic sewage treatment system comprising a pretreatment region, a main reaction region andan exhalant region, wherein the pretreatment region comprises a framed tube, an intake pipe, a filter bag, an air inlet pipe and a porous aerator; the main reaction region is formed by connecting a first unit, a second unit and a third unit in series; the bottom of the main reaction region is provided with a gravel water-distribution layer; a biological porcelain granule layer is distributed in the first unit; gravel and a steel slag layer are distributed in the second unit; a zeolite layer is distributed in the third unit; each unit is divided into a left grid and a right grid; the left gridis higher than the right grid; the top of an aquatic plant root region in the left grid is provided with a triangular weir; the pretreatment region and the main reaction region are connected by a perforated water-distribution plate which is arranged at one end of a gravel water-distribution layer; and the exhalant region comprises an exhalent pipe which is arranged at one side of the main reaction region. The invention has the advantages of high pollutant removal rate, stable system operation, greatly improved hydraulic load, small floor area, low operation and maintenance costs, and the like.

Relating to sewage treatment devices and sewage treatment methods, the invention provides an integrated sewage treatment device of a membrane bioreactor and a sewage treatment method. The invention aims to solve the problems of large land occupation area, high operation cost, complex operation management, unstable effluent quality and the like in existing sewage treatment technologies and devices. In the invention, a three-phase separator component is arranged inside a membrane bioreactor, and by means of bottom aeration and the separation effect of the separator, an integrated device with ananoxic upper part and an aerobic lower part can be formed. Sewage enters from the upper anoxic area of the reactor, and then enters the lower aerobic area through a slit of the three-phase separator.Meanwhile, a mixed solution backflow device is disposed to return a mixed solution in the aerobic area to the anoxic area, thus finishing nitrogen removal treatment of the sewage. The sewage treatment device and method provided in the invention can realize synchronous nitrogen removal and decarbonization, and have the advantages of small land occupation area, saving of sewage treatment required alkalinity and engineering cost, as well as simple operation management. And the sewage treatment device and method of the invention can be applied in treatment of urban sewage or nitrogen-containing industrial wastewater.

The invention discloses a two-section type reinforced denitrification multistage soil percolation system, comprising a front-section system and a rear-section system. The front-section system is an aerating aerobic open tank body and comprises a water inlet tank, an intake water distributor, a percolation layer, a hybrid module layer, a bottom cushion layer, a bottom drainpipe and an aeration system; the rear-section system is a non-aerating anoxic enclosed tank body and comprises an intake water distributor, a percolation layer, a hybrid module layer with novel solid-phase carbon source, a bottom cushion layer and a bottom drainpipe; the front-section system and the rear-section system are connected via a connecting pipe; and the vertical height of the two tank bodies is 20 to 50 cm. The two-section type reinforced denitrification multistage soil percolation system enables nitrification and denitrification to be independently carried out in different environments, so denitrification effect can be reinforced; since a degradable polymer is used as the novel solid-phase carbon source, the system has the substantial advantages of a high denitrification rate, no chroma influence on effluent and the like; and the system is low in infrastructure cost, stable in operation effect and convenient to maintain.

The invention provides a continuous flow aerobic granule sludge culture and grain diameter control method. The continuous flow aerobic granule sludge culture and grain diameter control method comprises the following steps: 1) enabling input water to pass through a thick-fine grid and a primary sedimentation tank in sequence and then enter a biochemical tank; 2) pressing output water of the biochemical tank to a cyclone separator and carrying out light and weight sludge separation, wherein the cyclone separator is a built-in barb cyclone separator and is internally provided with barbs for controlling the grain diameter of granular sludge; 3) pressing and reflowing a separated heavy sludge mixed solution back to an oxygen-free tank; pressing a light sludge mixed solution to a sedimentation tank and carrying out sludge-water separation; after carrying out the sludge-water separation, taking one part of sludge as residual sludge and reflowing the residual sludge to the front end of an anaerobic tank; dehydrating the other part of the sludge and conveying the sludge to the outer side; enabling the output water of the sedimentation tank to pass through a disinfection facility and realizing up-to-standard discharging. The invention provides a continuous flow aerobic granule sludge culture and grain diameter control system. The granulation of aerobic sludge is promoted and the grain diameter of granules is controlled to be in an optimal range.

The invention discloses an ammonia flue gas desulfuration and denitration combined process and device. The process comprises the following steps: liquid ammonia is fed into a desulfurization tower, flue gas to be processed is sprinkled and pre-washed and then fed into the desulfurization tower for sprinkling desulfuration and denitration, and the flue gas subjected to sprinkling desulfuration and denitration is demisted and dried and then discharged out of the desulfurization tower; cleaning solution in a prewashing tower and for sprinkling and washing comes from serous fluid in a tower kettle of the desulfurization tower, and meanwhile, liquid ammonia is injected into the prewashing tower to adjust the pH value of the cleaning solution to be 2-4.5; and the cleaning solution in the prewashing tower is led out and added with lime milk, liquid ammonia is injected into the cleaning solution added with lime milk to adjust the pH value to be 6.0-7.5, and then the mixture is filtered and returned to a sprinkling layer of the desulfurization tower to sprinkle and wash the flue gas. The flue gas denitration efficiency, the natural oxidation rate of (NH4)2SO3 and the purity of the by-product (NH4)2SO4 are all improved to a larger extent; and corrosion of the serous fluid to the desulfuration system is eliminated and the service life of the desulfuration equipment is prolonged.

The invention discloses a method for hydrogenation of heavy oil with a multistage supergravity reactor. The method comprises the following steps: starting up a motor of a supergravity reactor, drivingrotating discs of all stages to rotate, and meanwhile, turning on an ultrasonic probe of a charging chamber; loading hydrogen gas and heavy oil to the charging chamber, and carrying out gas-liquid two-phase efficient mixing, so as to form a gas-liquid mixture; and spraying the gas-liquid mixture to a rotating disc of a first-stage rotor from the lower end of the charging chamber under the actionof gas pressure and gravity, spinning the gas-liquid mixture to flow through a catalyst in the rotor by using a centrifugal force of the rotating disc so as to complete a gas-liquid-solid three-phasehydrogenation reaction process, conveying a reaction product to a rotating disc of a second-stage rotor from a liquid outlet of the bottom of the first-stage rotor, enabling the reaction product to enter the second-stage rotor for a reaction, and carrying out operation in such a manner until a reaction product enters an N-th rotor, is subjected to a reaction and then is discharged from the reactorfrom a liquid outlet of the bottom of a shell. According to the method disclosed by the invention, the deasphaltenizing percent can reach 50% or more, the demetalization percent can reach 80% or more, the desulfurization percent can reach 88% or more, and the denitrification percent can reach 45% or more.

The invention discloses a sewage treatment method of composite vertical letdown stream artificial wetland, sewage is processed through two-stage serial vertical letdown stream artificial wetland in the method, the two-stage vertical letdown stream artificial wetland comprises a bed, E-shape structure water distribution pipe and processing medium, internal carbon source waste pipe distributed at the bottom of a first stage vertical letdown stream artificial wetland, sewage enter uniformly into the bottom of the first stage vertical letdown stream artificial wetland from the top thereof via the E-shape structure water distribution pipe, then the processed sewage mixed with internal carbon source sewage is processed in the second stage vertical letdown stream artificial wetland. The invention has advantages of low processing cost, small accommodation area and good denitrification dephosphorization effect.

The invention discloses a liquid-phase circulating hydrogenation treatment method capable of reinforcing gas-liquid mass transfer. The process flow adopted by the method comprises: part of hydrogenation circulating oil and a fresh raw material are mixed to form a liquid-phase mixed material to be filled into supergravity gas-liquid hydrogen dissolution equipment together with hydrogen; through the drive of the high-speed rotation of a feeding rotor, gas-liquid countercurrent full contact is formed; the mixed liquid-phase material in which hydrogen is dissolved is discharge out from the bottom of the supergravity gas-liquid hydrogen dissolution equipment and contacted with a catalyst to undergo a hydrogenation reaction, and part of a liquid phase obtained after reaction is circulated. Compared with the prior art, the method has the advantages that: the rotation of the feeding rotor in the gas-liquid hydrogen dissolution equipment forms a supergravity field, so the gas-liquid mass transfer efficiency is increased greatly, and the liquid phase material can fully dissolve hydrogen; meanwhile, gas impurities such as H2S and NH3 in a reaction system can be removed efficiently, so that the hydrodesulfurization, denitrification, aromatic saturation, cracking and other reactions are promoted.

The invention relates to an A2/O-MBR-biological contact oxidation pond dual-sludge high-efficiency denitrifying phosphorus removal device and method and belongs to the field of active sludge sewage treatment. The device mainly consists of a water tank (1), an A2/O (3), a membrane biological reactor (9) and a biological contact oxidation pond (7) which are sequentially connected; the method is characterized in that, according to a contradiction existing in sludge age between nitrifying bacteria and phosphorus-accumulating bacteria, on one hand, the nitrifying bacteria with a longer sludge age are elutriated out of an A2/O system by shortening the sludge age of the A2/O; on the other hand, the nitrifying bacteria grow on biological fillers in the biological contact oxidation pond in the form of biological membranes, nitrifying reaction is fully performed, electron acceptors in the anoxic zone of the A2/O are guaranteed to be sufficient, and necessary conditions are provided for denitrifying phosphorus removal. In addition, the A2/O and the biological contact oxidation pond are connected through the membrane biological reactor (MBR), and a very good dual-sludge system environment is guaranteed. The A2/O-MBR-biological contact oxidation pond dual-sludge high-efficiency denitrifying phosphorus removal device and method are applicable to low-carbon-to-nitrogen-ratio urban sewage treatment, the process is advanced, the outlet water quality is stable and the advantages of energy saving and consumption reduction are remarkable.