822results about How to "Improve nitrogen removal efficiency" patented technology

One kind of short range nitrifying-anaerobic aminoxidizing sequencing batch type denitrifying biomembrane mode and plant is disclosed. The limited aerating mode with real-time control of the sewage temperature inside the reactor and high frequency alternation between aeration and anaeration can inhibit the growth of nitrite oxidizing bacteria and denitrifying bacteria so that the aminoxidizing bacteria and the anaerobic aminoxidizing bacteria become the dominant bacteria in the nitrifying and denitrifying stages. In the nitrifying stage, nitrification is stopped in the nitrite step; and in the denitrifying stage, ammonia nitrogen acts as the direct electron donor to reduce nitrite. The plant is provided with fixed spherical composite stuffing with spherical shell of polypropylene and filled inside biological composite material. Sectional discrete water feeding mode is adopted to feed the sewage to be treated in four stages into the reactor.

Disclosed is a technique for processing organic waste water, including the following steps: (a) preprocession: pour the waste water into the micro electrolytic reducing pool where the iron-carbon micro electrolytic reaction occurs under the agtatering effect, add hydrogen peroxide into it to have. Fento oxidation, then the water enters into coagulation pool into which add NaOH and PAM; (b) anaerobe hydrolysis oxidation procession: power the organic waste water preprocessed into high effective anaerobe hydrolysis oxidation pool in which add into the TCBS reactor in which add into high effective compound microbe, making the water mix with the flowing-back mud with high density after denitrification. The invention can increase the biochemical of organic waste water, strengthen its resistance to poison and impact as well as the biological denitrification funcation, and making the waste water reach the national environment protection requirement by reducing the polluting load by steps.

The invention provides an integrated internal circulation type denitrification and decarburization bio-membrane reactor and an operating method thereof. The main body of the reactor consists of an anoxic zone on the lower part, an aerobic zone on the upper part and a settling zone on the periphery of the aerobic zone; a composite filler is filled in the anoxic zone, and a water inlet pipe is communicated with the bottom of the anoxic zone; the aerobic zone is partitioned into a filler zone for adding a carrier on the upper part and a mud-water mixing zone on the lower part by adopting an orifice plate, the anoxic zone and the aerobic zone are partitioned through an impermeable partition plate, and a plurality of aeration pipes are arranged at the bottom of the aerobic zone and provided with air inlet pores; and the settling zone consists of three parts, namely a clean water zone, a contact settling zone and a sludge returning zone which are sequentially arranged from top to bottom, wherein the bottom of the sludge returning zone is provided with a sludge returning seam and communicated with the bottom of the aerobic zone. The reactor realizes zero power consumption in sludge returning, and is compact in structure; and a back flushing system is not required in the contact settling zone, and additional agents and carbon sources are not required, so that the reactor is low in running cost.

The invention discloses a device for autotrophic nitrogen removal by combining A / O shortcut nitrification of sludge digestion liquid and anaerobic ammonium oxidation of granular sludge and a method thereof. The device of the invention comprises a digestion liquid tank, an A / O shortcut nitrification tank, a sedimentation tank, a middle water tank, an anaerobic ammonium oxidation tank, wherein, the digestion liquid tank is communicated with a first cancellus as an anoxic zone of the A / O shortcut nitrification tank by the inlet pump of the A / O shortcut nitrification tank; the sedimentation tank the upper part of which is communicated with the middle water tank by a water pipe is provided with a central pipe and the anaerobic ammonium oxidation tank is provided with a water bath sleeve and a granular sludge bed. In addition, the method of the invention comprises the following steps of starting the A / O shortcut nitrification tank; starting the anaerobic ammonium oxidation tank of the granular sludge; operating an autotrophic biological nitrogen removal system in series after the starting of the A / O shortcut nitrification tank and the anaerobic ammonium oxidation tank is respectively completed. The device and the method of the invention are applicable to the shortcut nitrification and the nitrogen removal of the sludge digestion liquid in a sewage treatment plant and have the advantages of advanced technology, simple structure of the device, convenient operation and good treatment effect of water purification.

The invention discloses a method for processing coal gasification wastewater. The method sequentially comprises the following steps: a. carrying out preprocessing on the coal gasification wastewater in a preprocessing step comprising oil removal processing, coagulation processing and optional adjustment processing; then b. leading the preprocessed coal gasification wastewater to sequentially flowthrough a first-class bio-contact oxidation reactor, a biological electrochemical reactor, a second-class bio-contact oxidation reactor and an optional third-class or multi-class bio-contact reactor to carry out biological processing; and c. leading the biologically processed coal gasification wastewater to carry out catalytic oxidation processing in a catalytic oxidation reactor.

The present invention discloses a continuous flow shortcut nitrification-anaerobic ammonium oxidation biological denitrification method based on granular sludge, and an apparatus. The method comprises: 1) carrying out sludge inoculation culture, and carrying out an active sludge adaptation period; 2) starting a shortcut nitrification-anaerobic ammonium oxidation reaction; 3) performing an anaerobic ammonium oxidation granular sludge formation and growth period; and 4) performing a stable operation period of a granular sludge continuous flow system. The apparatus comprises a water inlet tank, a bioreactor, a sedimentation tank and a hydraulic screen filter, wherein the water inlet tank, the bioreactor, the sedimentation tank and the hydraulic screen filter are sequentially communicated, the influent of the water inlet tank is communicated with high ammonia nitrogen wastewater, the effluent is communicated with the bioreactor, the concentrated sludge on the bottom of the sedimentation tank is communicated with the bioreactor through a sludge reflux pump, a fixation filler, a stirrer, a filtration screen and an aeration head communicated with an air compressor are arranged inside an anoxic reactor, the sedimentation tank is provided with a clear overflow port communicated with the hydraulic screen filter through a pipeline, the effluent of the hydraulic screen filter is the final effluent, and the retained granular sludge refluxes to the bioreactor.

The invention relates to a rapid start method for an integrated autotrophic denitrification system and belongs to the technical field of treatment of sewage with high ammonia nitrogen. An SBR (Sequencing Batch Reactor) is inoculated with short-cut nitrification sludge and anammox sludge according to the mass ratio of (1: 3) to (1: 1), and the concentration of mixed sludge is 3,000mg / L to 4,000mg / L. The dissolved oxygen is controlled to be 0.3mg / L to 0.5mg / L by adopting an intermittent aeration operating mode, and the accumulation amount of nitrite nitrogen at the end of aeration is 20mg / L to 30mg / L; in each cycle, three aeration and hypoxic stages are set at intervals; each cycle has six stages, i.e., water inlet, aeration / hypoxic reaction, stirred degassing, precipitating, water outlet and standing. In a starting process, the concentration of dissolved oxygen is controlled unchanged, the balance of supply and consumption of nitrite nitrogen is maintained through a method of stagewise prolonging aeration stage time and shortening hypoxic stage time, and the rapid increase of denitrification load is achieved. When the initial ammonia nitrogen concentration in the reactor reaches 300mg / L, the balance of supply and consumption of nitrite nitrogen is maintained by means of shortening the hypoxic stage time. According to the method, the starting speed is high, the total-nitrogen removal load is high, and the operation is stable.

The invention discloses an electrochemical biological combined denitrification reactor, which comprises a tank body, an electrode plate, a particle electrode, an aerating apparatus and a constant current transformer. Both ends of the tank body are respectively provided with a water inlet and a water outlet. The electrode plate comprises an anode arranged on the center part of the tank body and a cathode which surrounds the anode to be arranged at the position close to the tank wall; the anode and the cathode are respectively connected with an anode and a cathode of the constant current transformer; the particle electrode is filled between the anode and the cathode; and the aerating apparatus comprises a fine bubble aerator arranged on the bottom of the tank body and an air pump connected with the fine bubble aerator. The device of the invention has compact and simple structure, small occupied area, high current utilization rate and rapid biofilm formation of microbe, can simultaneously remove various pollutants, such as organic matter, ammonia nitrogen and the like, has high denitrification efficiency and low energy consumption, is easy to regulate and control and is a multiple three-dimensional electrode biomembrane sewage treatment device integrating biology with an electric microfield into whole body.

The invention provides a device and a method for treatment of low-temperature and low-carbon ammonia nitrogen wastewater on the basis of solid-phase denitrification and heterotrophic nitrification-aerobic denitrification. The device comprises a reactor and a reflux system, wherein the upper part and lower part of the reactor are respectively provided with a fluidized bed aerobic zone and a filterpool anoxic zone which are filled with a solid carbon source filling material and separated by a porous water distribution plate; an aeration tube is arranged on the water distribution plate and connected with an aeration device through a gas flowmeter; the lower end of the reactor is provided with a water inlet; the upper end of the reactor is provided with a water outlet; an effluent of the reactor enters a secondary sedimentation tank, and an effluent of the secondary sedimentation tank enters an intermediate water storage tank through an overflowing opening; the upstream end of the refluxsystem communicates with an effluent of the intermediate water storage tank; the downstream end of the reflux system communicates with the reflux opening of the lower end of the reactor through a liquid flowmeter; and the interior of the fluidized bed aerobic zone is provided with a dissolved oxygen monitor and a nitrate concentration monitor. The device and the method provided by the invention can still realize highly-efficient removal of ammonia nitrogen and total nitrogen under the conditions of low temperature and low carbon.

The invention discloses a method for treating caprolactam-containing waste water. The method comprises the following steps of 1, putting production waste water needing to be treated into an adjustment tank to carry out preaeration treatment, and feeding the treated production waste water into a coagulation sedimentation basin to carry out coagulation sedimentation, 2, carrying out anaerobic degradation, 3, carrying out aerobic degradation, 4, carrying out secondary coagulation sedimentation to obtain settled sludge, feeding the settled sludge back to an anoxic tank to carry out microbe amount supplement, feeding residual sludge back to a sludge tank, disinfecting water treated in a secondary coagulation sedimentation tank, and discharging directly the disinfected water to the environment, and 5, carrying out press filtration of sludge in the sludge tank by a plate and frame filter press, and feeding the filtrate to the adjustment tank. The invention also discloses a device adopting the method. Compared with the traditional technology, the method for treating caprolactam-containing waste water has high nitrogen removal efficiency and good treatment effects. The device for treating caprolactam-containing waste water has the advantages of simple structure and good waste water treatment effects.

An acinetobactersp and ammonia nitrogen degrading method of waste water are disclosed. It includes: adding at least one of C1-C6 organic substances with 0.01-1wt%, adding Acinetobactersp and waste water with 10 to the power 5-10 to the power 12 bacterium / ml concentration, and aerating under gas-water ratio 10-15. It achieves environmental protection, simple process, high efficiency.

The invention discloses a sequencing batch internal circulation biological denitrification process. The process mainly comprises four steps of water feeding, biological denitrification reaction, precipitation and water and mud discharge. The biological denitrification reaction comprises an internal circulation reaction from short-cut nitrificaition treatment to deoxidation treatment, anaerobic ammoxidation treatment and to the short-cut nitrificaition treatment, and the short-cut nitrificaition treatment, the deoxidation treatment and the anaerobic ammoxidation treatment are carried out in three intercommunicated different reaction areas of one reactor. The invention further discloses a biological denitrification device. The device is separated into three intercommunicated reaction areas, that is, a short-cut nitrificaition treatment reaction area, a deoxidation treatment reaction area and an anaerobic ammoxidation treatment reaction area. The device is further equipped with an aerating device, an internal circulation pump, a water distributor and the like. The process has the advantages of convenient operation management, low energy consumption, high denitrification efficiency and stable treatment effect, and the device matching the process has the advantages of compact structure, convenient use, low cost and the like.

The invention relates to a heterotrophic nitrifying and aerobic denitrifying bacterium for efficient denitrification, and the culture and application of the heterotrophic nitrifying and aerobic denitrifying bacterium. The bacterium belongs to an acinetobacter species (Acinetobacter), with the name of Acinetobacter sp.Y1, the preservation registration number of CGMCC NO.6563, the preservation institution of China Microorganism Culture Preservation Management Council General Microbiological Center and the preservation time of September 14th, 2012. The bacterium is separated from activated sludge of coking wastewater, can not only quickly remove ammonia nitrogen, but also grow under the condition that nitrite and nitrate are taken as sole nitrogen sources, and effectively removes nitrite nitrogen and nitrate nitrogen, and can be applied to nitrogen-containing wastewater treatment.

The invention discloses a nitration method of iron-carbon nitrosation, a reactor therefor and a method of sewage water denitrogenation. Iron filings and active carbon are added in the reactor hierarchically or mixed, water containing ammonia nitrogen is supplied in the reactor and oxygen enriched air is blew in thereof, only inorganic iron-carbon in condition of aeration, ammonia nitrogen is conversed into nitrite and nitrate steadily. The reactor is composed of a supporting layer, a back purge system, a water-inlet- distribution device, a air diffuser, iron / carbon composite material, a drift eliminator and bed body, nitrosation or nitration is finished in action of ammonia sewage water. The reactor is combined with a denitrify reactor, a anaerobic bioreactor, or used as a aeration biological filter of biology filler to finish denitrification process of nitrogen sewage water. The reactor has advantages of stable performance, high efficiency, low power cost and simple maintenance. An integrated denitrification technics is formed in the reactor, denitrification efficiency of the whole flow is improved.

The invention relates to a horizontal underflow constructed wetland capable of strengthening denitrification at a low temperature. The constructed wetland consists of a water distribution region, a filling region, an aeration device, a water collecting region and wetland plants, wherein large-grain detritus is positioned in the water distribution region and the water collecting region; the filling region is arranged between the water distribution region and the water collecting region; medium-grain detritus, medium-grain zeolite and fine-grain detritus are positioned in the filling region sequentially; and aeration pipes are laid on the bottom layer of a zeolite segment and the aeration quantity is adjustable. Sewage is subjected to pretreatment, so that suspended matters and part of pollutant are removed, and then the sewage is subjected to constructed wetland purification treatment. The horizontal underflow constructed wetland can greatly improve the dissolved oxygen concentration of the sewage and the ammonia nitrogen adsorption capacity of regenerated zeolite in the horizontal underflow constructed wetland and can maintain high-efficiency and stable nitrogen removal rate of a system.

The invention relates to a method for deep denitrification of low carbon source urban sewage and belongs to the technical field of biological sewage treatment. Urban sewage and refluent nitrification liquid enter a short-range denitrification anaerobic ammonium oxidation area of a deep denitrification bioreactor, denitrifying bacteria on a biofilm outer layer reduce nitrate nitrogen in the refluent nitrification liquid into nitrite by utilizing a limited organic carbon source in raw water, and anaerobic ammonium oxidizing bacteria on a biofilm inner layer enable the generated nitrite nitrogen and ammonia nitrogen in part of raw water to react and be converted into nitrogen; the sewage enters an aerobic area to be subject to short-range nitration, so that the remaining part of ammonia nitrogen of the sewage is converted into nitrite nitrogen; then the sewage enters the anaerobic ammonium oxidation area, enters the aerobic area and the anaerobic ammonium oxidation area, and finally enters a nitrification area, so that the nitrate nitrogen and the ammonia nitrogen in the raw water are oxidized to be nitrate nitrogen. According to the method, through the united application of short-range denitrification-anaerobic ammonia oxidation and short-range nitrification-anaerobic ammonia oxidation, the deep denitrification of the low carbon source urban sewage is performed.

The invention provides a method for treating high-concentration nitrate waste water and municipal sewage through denitrification anaerobic ammonium oxidation SBR, belonging to the field of sewage biotreatment. The method comprises the following steps: firstly, culturing and acclimating denitrifying bacteria population and anaerobic ammonium oxidation bacteria population which have inadequate denitrification characteristic, then inoculating anaerobic ammonium oxidation sludge and denitrifying sludge with high nitrite accumulation rate in the same reactor, leading nitrate waste water and municipal sewage to flow in denitrification anaerobic ammonium oxidation SBR reactor at a certain ratio, performing anaerobic ammonium oxidation to nitrite accumulated during reduction of nitrite and ammonium nitrogen in the municipal sewage to generate nitrogen gas and synchronously removing. According to the method, nitrate generated during anaerobic ammonium oxidation can be reduced through denitrifying bacteria without the condition of adding a carbon source, the nitrogen removal efficiency of a system can be improved, and the effective route for realizing sewage nitrogen removal with high efficiency and low energy consumption can be provided.

The invention provides a coking wastewater treatment method, which is characterized by comprising the following steps: introducing coking wastewater to an anaerobic tank and an anoxic tank, and carrying out denitrification to remove nitrogen by using refractory organic matters in the wastewater as a carbon source; then carrying out two-stage aerobic biological treatment to convert ammonia nitrogen into nitrite nitrogen and nitrate nitrogen by virtue of nitration reaction, wherein biochemical effluent does not reach emission standard; and carrying out coagulation-sedimentation treatment, namely carrying out A / A / O1 / O2 (anaerobic / anoxic / first-stage aerobic / second-stage aerobic) coagulation combined process. The method provided by the invention does not need the introduction of additional carbon sources such as methanol, removes nitrogen through denitrification by using the refractory organic matters in the wastewater as the carbon source, reduces the load of sequent aerobic segment and reduces power consumption. Phenol-containing sodium carbonate wastewater and the basicity generated by the denitrification can supply the basicity required by the nitration reaction, thus reducing the consumption of sodium hydroxide and lowering the running cost.

The invention discloses a reinforced denitrification method for a three-dimensional electrode biological film. A three-dimensional electrode biological film process and a sulfur autotrophy process are coupled for denitrification treatment on sewage; and the three-dimensional electrode biological film process is reinforced by increasing the ratio of the autotrophic denitrification. An adopted reactor comprises a cathode, an anode, a direct current power supply, a particle electrode and active plasmids. The reinforced denitrification method is characterized in that activated carbon grains are taken as the particle electrodes, sulfur grains are taken as the active plasmids, and the two are uniformly mixed between the cathode and the anode according to a volume ratio of 5:1 to 10:1. Compared with the conventional three-dimensional electrode biological film process, the reinforced denitrification method greatly improves the removal rate of TN and NO3-N in sewage, effectively improves the situation that the pH values of effluent and inflow water in the three-dimensional electrode biological film process are too large, and has stronger pH value buffering capability; and furthermore the situation that the NO2-N is excessively accumulated in the effluent in the ordinary three-dimensional electrode biological film deep denitrification process is solved.

The invention relates to the technical field of sewage treatment. The invention particularly provides a method for realizing synchronous nitrification and denitrification nitrogen removal by utilizingan immobilized microorganism technology. The adopted immobilized microorganism technology comprises the following steps: mixing a nitrifying bacterium agent and a denitrifying bacterium agent according to a certain ratio and adsorbing the mixture by using an adsorbent; embedding the adsorbed microbial inoculum by adopting an embedding agent; after embedding, adding dropwise a gel solution into across-linking agent to form gel beads with biological activity. The prepared gel beads sequentially form aerobic, anoxic and anaerobic environments from the surface to the inside which perform nitrification reaction, denitrification reaction and hydrolytic acidification respectively, nitrification liquid backflow is not needed, and synchronous nitrification and denitrification nitrogen removal canbe realized. Compared with a traditional biological denitrification process, the method has higher denitrification efficiency, and is simple in operation process, convenient to maintain and manage and easy to popularize.

The invention discloses an integrated oxidation ditch and a construction and operation method thereof. The construction and operation method has the technical proposal that the integrated oxidation ditch is divided into an anoxic zone, an anaerobic zone and an aerobic zone, which are communicated mutually, the anoxic zone and the anaerobic zone are arranged at one end of the integrated oxidation ditch in common, the aerobic zone is arranged at the other end of the integrated oxidation ditch, and a water-retaining wall is arranged at the middle part of each zone to cause each zone to be formed a single annular channel, water inlet pipes used for feeding water by the division point way are arranged at the anoxic zone and the anaerobic zone, an aeration device is arranged in a circulation channel at one side of the aerobic zone communicated with the anoxic zone, and a mud-water separation device used for the mud-water separation and the water emission is built on the side wall of the aerobic zone for the water emission. The aeration device is started, and the sewage passes through the anoxic zone, the anaerobic zone, the aerobic zone, and the mud-water separation device in sequence, so the dephosphorization and the denitrification as well as the decarbonization treatments of the sewage are realized. The integrated oxidation ditch has the advantages of simple structure, lower cost, small occupation area, and good sewage treatment effect, and can particularly and effectively perform the dephosphorization and the denitrification simultaneously.

The invention relates to an anaerobic-sequencing batch biofilm reactor-artificial wetland method for treating piggery waste water, which is characterized by comprising the following steps: (1) a sewage collecting pipe network collects waste water; (2) the anaerobic environment in a hydrolytic acidification tank enables the organic waste to be subject to biodegradation; (3) an SBBR adjusting tank can achieve the effects of adjusting water quality and water quantity; (4) the waste water is enabled to reach the requirements of GB18596-2001, Discharge Standard of Pollutants for Livestock and Poultry Breeding; and (5) the operation effect of an SBBR reactor and the energy consumption quantity are enabled to reach the optimal combination. The invention has the advantages that the occupied area is decreased; the anaerobic reactor can omit the operating unit required for stabilizing sludge, thereby further decreasing the occupied area and the treatment cost; the waste water treatment effect is better; high denitrification efficiency and stable treatment effect are achieved; and finally, the treatment performance of the combined artificial wetland is fully used to carry out the advanced treatment of denitrification and dephosphorization and meanwhile achieve the effect of reducing the energy consumption of the SBBR system.

The invention relates to a CANON (Completely Autotrophic Nitrogen removal Over Nitrite) process starting method for an MBR (Membrane Bioreactor) and belongs to the field of the denitrification treatment and regeneration of municipal domestic sewage. According to the method, the MBR is only inoculated with ordinary active sludge, a CANON process is started successfully in 46 days by a nitrosification start-up and stable-operation stage, a CANON process start-up stage and a CANON process load increase stage through adjusting aeration, aeration time and the concentration of inorganic carbon under the condition of limited oxygen, the total nitrogen removal load can reach 0.41kgN / m<3> / d to the maximum and is 0.38kgN / m<3> / d to the average after 76 days, and then, the quick start and efficient and stable operation of the CANON process are successfully realized.

The invention discloses a method for hydrolyzing and acidifying residual sludge and organic wastes and supplementing carbon sources to promote biological nitrogen removal and an application thereof. The method comprises the following steps of: firstly hydrolyzing and acidifying after the residual sludge is mixed with the organic wastes, then flowing hydrolyzed and acidified mixed liquid backwards to a biological anaerobic pool and supplementing the carbon sources. The method and the application thereof have the advantages that the problem of insufficient hydrolyzed and acidified carbon sources in the residual sludge is solved, the carbon sources in the residual sludge and the organic wastes are fully utilized, no additional carbon source is required, and the biological nitrogen removal efficiency is improved. The method and the application thereof can be applied to the upgrade and the reconstruction of a biological treatment process in an anaerobic-anoxic-aerobic and anoxic-aerobic sewage treatment plant, thereby realizing the recycle of the sludge and the organic wastes.

The invention discloses a normal-temperature starting domestication method for an anaerobic ammoxidation reactor with low-dissolved-oxygen inflow water and relates to the starting domestication method of a reactor. The method aims to solve the problems that starting time of the anaerobic ammoxidation reactor is long, and that the dissolved oxygen in the inflow water brings the adverse effect on the anaerobic ammoxidation process and causes high energy consumption. The method comprises the following steps: 1, culturing a denitrification biomembrane; 2, starting the anaerobic ammoxidation reactor; and, 3, domesticating the anaerobic ammoxidation reactor. The method provided by the invention uses the denitrification biomembrane as the secondary seed sludge and starts the anaerobic ammoxidation reactor within 100d successfully; under the condition that the inflow water contains 1-1.5mg / l of dissolved oxygen, the method provided by the invention can domesticate microflora in which the aerobic bacteria and anaerobic bacteria are co-existing. The method provided by the invention reduces the operation temperature of the anaerobic ammoxidation reactor from 35 DEG C to (19-22) DEG C, and greatly reduces the operation cost; meanwhile, the reactor system still operates stably and realizes high denitrification effect.

The invention relates to the technical field of industrial wastewater treatment and provides a device and a process for biochemically denitrifying high-ammonia nitrogen tanning wastewater. The device and the process can effectively and synchronously remove chemical oxygen demand (COD), ammonia nitrogen and total nitrogen from the tanning wastewater. The device mainly comprises a materializing pre-treatment unit, a biochemical pre-treatment unit, an adjusting water pool, a multi-grade anaerobic / aerobic treatment unit and a sludge and water separating unit. The treatment process mainly relates to a tanning wastewater treatment process in which anaerobic biological treatment and aerobic biological treatment are mutually alternated and in multistage series operation.

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 method for preparing ecological water purification particles mainly from denitrification biological microcapsules and sustained-release carbon sources and effectively solves problems of denitrification microorganism insufficiency of micropollution water, low C / N ratio, poor biodegradability, difficulty in recovery and secondary pollution. The method includes: culturing a microbial strain to obtain denitrification microorganisms; dissolving chitosan into acetic acid solution to obtain chitosan solution; dissolving sodium alginate into water, and adding span 80 to obtain sodium alginate solution; well mixing the sodium alginate solution with the denitrification microorganisms, dropwise adding CaCl2 solution to obtain calcium alginate capsules, and putting the calcium alginate capsules into the chitosan solution to obtain microcapsules through secondary solidifying; putting the microcapsules into sodium citrate solution, and performing interlayer calcium alginate liquefying to obtain biological microcapsules; well mixing hydrophilic materials, pore-forming materials, adhesives, the sustained-release carbon sources and the biological microcapsules to obtain spherical ecological water purification particles, and curing. The method has advantages of rich materials, low cost, freeness of toxicity and harms to microorganisms, recyclability and freeness of secondary pollution.

The invention discloses a modified biological filtering pool filler and relates to a modified filler applied to an aerated biological filtering pool and a method for processing the same. An inorganic filler ceramic particle, lava or porous ceramic, which is used as a carrier, is subjected to pickling, alkali cleaning, drying, sterilization and other processing procedures and is dipped in a dilute aqueous solution containing cationic polyacrylamide (Polyacrylamide, abbreviated as PAM) so that the inner surface of the filler is modified to obtain an inorganic carrier of which the surface of an inner hole is formed with a polymer molecular body with positive charge; and the inorganic carrier is domesticated to generate the immobilized microorganism filler. Through double functions of physical adsorption and ionic bond combination, the filler improves physicochemical performance and washing resistance performance of the immobilized microorganism for inorganic carrier, is favorable for improving loading amount of microorganism and domestication and proliferation of the microorganism, saves the cubage of a reactor, shortens reaction time, improves efficiency biological denitrification and saves investment.

The invention relates to a method for removing sulfur oxides and nitrogen oxides in catalytic cracking regeneration flue gas. According to the invention, regeneration flue gas discharged from a catalytic cracking regeneration device is delivered into a high-temperature zone reactor, and is subjected to a reaction at a catalyst bed layer with a reducing gas under a temperature of 620-690 DEG C; sulfur oxides, nitrogen oxides and oxygen in the flue gas are subjected to the reaction with the reducing gas, such that gas-state elemental sulfur, nitrogen and water vapor are produced; after the reaction, a mixed flue gas containing gas-state sulfur is delivered into a flue gas turbine, and is delivered into a middle-temperature zone reactor; under a temperature of 500-550 DEG C, the mixed flue gas is subjected to a reaction with reducing gas, such that gas-state elemental sulfur, nitrogen and water vapor are produced; after the reaction, a mixed gas is delivered into a waste heat boiler and is subjected to heat exchange until a temperature is 150-250 DEG C, and liquid-state sulfur is recovered; and the material is subjected to heat exchange in a cooling device, and solid-state sulfur is recovered. With the method provided by the invention, a subsequent desulphurization treatment process of sulfur-containing flue gas of a catalytic cracking device is eliminated, a catalytic cracking device pollutant controlling process is simplified, and powerful guarantee is provided for clean production of the catalytic cracking device.