559 results about "Denitrification process" patented technology

The invention discloses a preparation method and application of efficient polyculture denitrification synergistic phosphorus removal filler, and belongs to the field of functional material development and sewage treatment. The method specifically comprises the following steps: step 1, uniformly mixing iron ore powder, sulfur powder and polyester high-molecular compound powder, and heating and melting; and 2, carrying out molding treatment on the molten substance, and cooling and solidifying to obtain the efficient polyculture denitrification synergistic phosphorus removal filler. According to the polyculture denitrification synergistic phosphorus removal filler disclosed by the invention, a polyester high-molecular compound is used as a supplementary electron donor of a sulfur-iron ore autotrophic denitrification synergistic phosphorus removal system, so that the nitrogen removal efficiency of denitrification is improved; the compound also can be used as an electron donor to participate in a ferrous sulfide reduction reaction, so that the discharge of sulfate in effluent is reduced, and enhanced phosphorus is removed in a form of Fe3 (PO4) 2 precipitate; meanwhile, heterotrophic denitrification generates alkalinity to make up the consumption of alkalinity in the autotrophic denitrification process, and the stability of pH in the system is maintained, so that the removal efficiency of nitrogen and phosphorus is enhanced, and secondary pollution is reduced.

The invention provides an intelligent control method for sewage biological nitrogen removal and denitrification carbon source addition, which combines an ASM activated sludge mechanism model based on a sewage biological treatment mechanism and an AI artificial intelligence model based on data driving to construct an ASM-AI mixed model, can accurately simulate a nitrogen removal and denitrification reaction process in a sewage treatment process, and has the advantages of simple operation, high accuracy and high practicability. On the basis, the optimal carbon source feeding amount is obtained by setting a target function, carbon source feeding in the denitrification process is intelligently controlled, accurate control over carbon source feeding is achieved through real-time data monitoring, ASM-AI mixed model prediction and continuous training of an ASM-AI mixed model, the nitrogen removal efficiency of denitrification is improved, and the nitrogen removal efficiency of denitrification is improved. The carbon source adding cost is saved, and the stability, high efficiency and economical efficiency of biological sewage treatment denitrification are ensured.

The invention discloses a composite denitrification accelerant and a preparation method thereof, and belongs to the technical field of sewage treatment. The carbon source composite material is prepared from the following raw materials in parts by weight: 30-50% of a carbon source, 2-5% of vitamins, 2-5% of amino acids, 1-3% of a biological stimulant, 1-2% of signal molecules, 1-5% of metal elements, 3-5% of a pH regulator and 25-60% of water. Through metabolites such as vitamins, amino acids and biological stimulants, growth and reproduction of denitrifying bacteria are promoted, and functions of related enzymes in the denitrification process are improved. The signal molecule optimizes the metabolic activity of bacteria by regulating and controlling the expression of genes, related to the denitrification process, of the denitrifying bacteria. The metal ions can enhance the activity of the denitrifying enzyme, so that the efficiency of denitrification treatment is improved. According to the denitrification accelerant, the denitrification process is promoted through the synergistic effect of three aspects of growth and reproduction of denitrifying bacteria, expression of denitrification genes and improvement of activity of denitrification-related enzymes.

The invention discloses rapid denitrification composite carbon source particles as well as a preparation method and application thereof. The rapid denitrification composite carbon source particle is prepared from raw materials including a slow-release skeleton, a carbon source and an optional functional modified material. The invention integrates the advantages of two solid carbon sources (natural carbon source and artificially synthesized carbon source), and develops novel composite carbon source particles with excellent performance and high cost effectiveness by designing and regulating the formula, proportion and structure. The prepared rapid denitrification composite carbon source particles can ensure that microorganisms have stable carbon source supply in the whole denitrification process, and the denitrification efficiency reduction caused by discontinuous or non-uniform carbon source supply is avoided. The rapid denitrification composite carbon source particles prepared by the invention also have the characteristics of easy biofilm formation, easy fluidization, stable carbon release, lasting carbon supply, relatively high mechanical strength, low cost, wide application range, difficulty in breaking, long service cycle and large specific surface area, and can be well applied to a biological sewage treatment system as a microbial carrier.

The invention provides a sewage treatment method and treatment system utilizing effective distribution before and after combination of AOA and a carbon source. Belongs to the technical field of sewage treatment. The method comprises the following steps: sequentially carrying out denitrification, first anaerobic phosphorus release, first nitrification, second nitrification and second anaerobic phosphorus release on sewage to obtain a first nitrification solution; part of the first nitrification liquid flows back to the denitrification process, the remaining first nitrification liquid is precipitated, and purified water and sludge are obtained; or sequentially carrying out denitrification, first anaerobic phosphorus release, first nitrification and second nitrification on the sewage to obtain second nitrification liquid; part of the second nitrification liquid is refluxed into the denitrification process, the remaining second nitrification liquid is sequentially subjected to second anaerobic phosphorus release and precipitation to obtain purified water and sludge, the nitrification liquid is refluxed, nitrate which is not subjected to denitrification is refluxed to be further denitrified, and therefore the concentration of nitrate in treated effluent and the concentration of total nitrogen in the effluent are reduced. The sewage treatment effect is improved.

Provided are a composite carbon source particle for rapid denitrification, and a preparation method therefor and the use thereof. The composite carbon source particle for rapid denitrification is prepared from raw materials including a sustained-release framework, a carbon source and an optional functionalized modification material. The composite carbon source particle for rapid denitrification can ensure the stable supply of a carbon source to microorganisms during the whole denitrification process, prevents a reduction in denitrification efficiency caused by discontinuous or non-uniform supply of a carbon source, has the characteristics of easily forming a biofilm, good fluidizability, stable carbon release, long-lasting carbon supply, relatively high mechanical strength, low cost, a wide application range, low risk of fragmentation, a long service cycle and a large specific surface area, and can be applied as a microbial carrier to a biological sewage treatment system.

The invention provides a low C / N sewage nitrogen and phosphorus removal method based on MABR-DPR-anaerobic ammonia oxidation, which couples anaerobic, membrane aeration anoxic and anaerobic ammonia oxidation processes, forms an anoxic environment in a water phase of a membrane aeration reactor, and enriches denitrifying phosphorus-accumulating bacteria. And the anaerobic phosphorus release and anoxic denitrification nitrogen and phosphorus removal processes of the denitrifying phosphorus-accumulating bacteria are realized through the backflow of the sludge between the anaerobic tank and the membrane aeration reactor. Nitrite accumulated in effluent of the membrane aeration reactor supplements an electron acceptor for a subsequent anaerobic ammonia oxidation deep denitrification process, and meanwhile, a carbon source is obviously consumed in an anoxic denitrification nitrogen and phosphorus removal process of the membrane aeration reactor, so that inhibition of influent organic matters on an anaerobic ammonia oxidation process is effectively weakened. The process solves the problem that the carbon source is seriously insufficient in the nitrogen and phosphorus removal process of the low C / N sewage, and the stable and efficient nitrogen and phosphorus removal effect can still be maintained under the condition that an external carbon source is not needed.

The invention discloses a landfill leachate anaerobic-denitrification treatment process and system based on waste molasses synergistic interaction, and belongs to the technical field of sewage treatment. The process comprises the following steps: (1) carrying out two-stage anaerobic digestion on the landfill leachate to remove organic matters and recover biogas, wherein first-stage anaerobic digestion adopts medium-temperature (35 + / -2 DEG C) anaerobic digestion, and second-stage anaerobic digestion adopts high-temperature (55 + / -1 DEG C) anaerobic digestion; (2) removing impurities from the waste molasses, diluting the waste molasses, mixing the diluted waste molasses with activated sludge, fermenting under an anaerobic condition to generate fermentation liquor rich in volatile fatty acid, and adding the fermentation liquor into a denitrification reactor; and (3) constructing an anaerobic-denitrification synergistic system, and increasing the denitrification rate by using the charcoal-loaded nano zero-valent iron (nZVI at BC) as an electronic mediator. According to the method, resource utilization of the waste molasses is realized, the problem of imbalance of the carbon nitrogen ratio of the landfill leachate is solved, anaerobic digestion and nitrification and denitrification processes are coupled, efficient nitrogen removal and organic matter removal are realized, and meanwhile, the sludge yield and the operation cost are reduced.

The invention discloses a sulfur disproportionation-mediated low-temperature high-efficiency low-carbon denitrification and synchronous ammonium recovery method for sewage, belongs to the field of sewage treatment, and aims to solve the problems that an existing autotroph denitrification process cannot adapt to water quality fluctuation and seasonal variation and is poor in engineering applicability. Polyculture denitrification and elemental sulfur disproportionation (SD) are used as an effective enhanced denitrification scheme and are applied to a low-temperature SDAD system of actual sewage. Sulfide and polysulfide generated in situ through elemental sulfur disproportionation reaction and low-concentration sodium acetate under the polyculture condition are used as supplementary electron donors, so that the denitrification rate is remarkably increased. The process of reducing dissimilatory nitrate into ammonium (DNRA) in the SD-MixBNR system is beneficial to emission reduction of greenhouse gases while realizing ammonium recovery. According to the method, the SD-MixBNR system can be promoted to be widely applied to actual engineering projects under the carbon neutralization background, and the stability and adaptability of the SD-MixBNR system in the face of various water quality fluctuations and seasonal changes are enhanced.

The invention discloses a method for enhancing nitrogen and phosphorus removal effects of a whole-course autotrophic nitrogen removal system, and belongs to the technical field of sewage treatment. According to the method, the steel slag powder and the steel slag particles are applied to a nitrification section and a sulfur autotrophic denitrification section respectively, alkalinity consumed by nitrification is supplemented by adding the steel slag powder in the nitrification section, enrichment of nitrifying bacteria is facilitated, metal ions leached from the steel slag powder improve the ammonia nitrogen removal rate, meanwhile, part of phosphate is removed, and the ammonia nitrogen removal rate is increased. The average removal rate of ammonia nitrogen is 99.75%, and the average removal rate of phosphate is 23.22%. According to the invention, the denitrification potential and denitrification effect of the sulfur autotrophic denitrification section are improved, and when the HRT is 3h, the average 97.04% of total nitrogen and the average 86.4% of total phosphorus can be removed; in the denitrification process, metal ions leached from the steel slag can generate precipitates with phosphate, and H < + > generated in the denitrification process can accelerate erosion of the steel slag, so that the phosphorus removal capacity of the steel slag is improved.

The invention relates to an MABR-based short-cut nitrification and denitrification coupled micro-aerobic biochemical treatment method, and relates to the technical field of water treatment. The device mainly comprises a two-stage MABR-PN / DN tank, a two-stage MABR micro-aerobic tank, a sedimentation tank, a gas supply system and a monitoring system, the MABR-PN / DN tank and the MABR micro-aerobic tank are respectively implanted into an MABR membrane box, sewage sequentially passes through the first-stage MABR-PN / DN tank, the first-stage MABR micro-aerobic tank, the second-stage MABR-PN / DN tank, the second-stage MABR micro-aerobic tank and the sedimentation tank, and the gas supply system is independently arranged and supplies gas to the MABR-PN / DN tank and the MABR micro-aerobic tank through pipelines. According to the invention, a short-cut nitrification and denitrification process and a low-aerobic nitrification and denitrification process are established by taking a microbial film growing on the outer surface of the MABR membrane filament as a carrier, meanwhile, a two-stage MABR-PN / DN tank and a two-stage MABR micro-aerobic tank are utilized, a nitrification liquid internal reflux system is not arranged to remove nitrogen, and the effluent index of a municipal sewage treatment plant is improved. The method has the advantages that the pollutant removal effect is good, the addition of an external carbon source is saved, the occupied area is saved, the treatment period is short, the energy consumption is low, and the sludge yield is reduced.

The invention relates to the technical field of flue gas treatment equipment, in particular to a flue gas desulfurization and denitrification treatment device and method for lead-zinc smelting, a desulfurization mechanism is arranged, flue gas and a desulfurizer solution can be fully mixed, compared with a traditional spray mixing mode, the reaction efficiency is higher, blockage is not prone to occurring in the desulfurization process, and the desulfurization effect is better. The dedusting mechanism and the cleaning mechanism are arranged, the dedusting mechanism is beneficial for dedusting flue gas and removing dust and impurities carried in flue gas, meanwhile, the cleaning mechanism can be used for cleaning the spraying layer and removing accumulated reactants or products, and the anti-blocking mechanism is arranged, so that the desulfurization process is kept smooth; and the whole flue gas desulfurization and denitrification process can be smoothly carried out.

The invention discloses a biological filler for enhancing denitrification of an aerobic tank as well as preparation and application of the biological filler, the problem of weak activity of denitrifying bacteria is successfully solved by loading three layers of biological fillers, namely an inner layer-denitrifying bacteria, a middle layer-conducting layer and an outer layer-nitrifying bacteria, on the filler, and rapid formation of a biological membrane is realized. In addition, a metal conducting layer is additionally arranged in the middle to participate in electron transfer in the microbial denitrification process, and the biological membrane layers on the two sides achieve rapid formation of biological membranes so as to achieve conversion and removal of nitrogen. According to the method, the biological activity of the thalli can be kept, the rapid formation of a biological membrane is realized, and the separation of the thalli and refractory organic matters can be promoted, so that the toxic action on the thalli is reduced.

The invention relates to the field of sewage treatment, in particular to a sewage treatment system capable of recycling sulfur based on sulfur autotrophic denitrification, which comprises a pretreatment tank, an aerobic tank, a sulfur autotrophic denitrification reactor, an anaerobic tank and a secondary sedimentation tank which are sequentially connected, and the part of the secondary sedimentation tank containing supernatant mixed liquor is communicated with the aerobic tank; the anaerobic tank contains sulfate reducing bacteria, and sulfate radicals (SO4 < 2->) in the sewage discharged from the sulfur autotrophic denitrification reactor are reduced into S < 2-> by the anaerobic tank under the action of the sulfate reducing bacteria; water containing S < 2-> in the anaerobic tank enters a secondary sedimentation tank, and supernatant mixed liquor in the secondary sedimentation tank flows back to the aerobic tank; sulfur oxidizing bacteria are contained in the aerobic tank, and S < 2-> in the liquid flowing back from the secondary sedimentation tank is oxidized into S < 0 > and S2O3 < 2-> by the aerobic tank under the action of the sulfur oxidizing bacteria. According to the scheme, the problem that more SO4 < 2-> is generated in the current sulfur autotrophic denitrification process is solved, meanwhile, the consumption of electron donors is reduced, and the cost is reduced.

The invention discloses an interval aeration sludge single-reflux continuous flow AOA process and an interval aeration sludge single-reflux continuous flow AOA device, and belongs to the field of biological sewage treatment and recycling. The device comprises a water inlet tank, an interval aeration continuous flow AOA reactor and a secondary sedimentation tank. Raw water is firstly pumped into an anaerobic section of a reactor through a water inlet pump, internal carbon source storage is performed, then the raw water enters an interval aeration section, aeration nitrification is performed in an aerobic section, denitrification is performed by utilizing the stored carbon source in an anoxic section, the raw water enters two aerobic sections and two anoxic sections, and nitrification and internal source denitrification processes are repeated, and a second grid in the section is provided with an anoxic-aerobic alternating grid chamber. According to the method, the carbon source is fully utilized, aerobic and anoxic time is reasonably distributed for interval aeration, internal carbon source loss caused by aeration is reduced, internal source denitrification utilization is promoted, the carbon source adding cost is saved, resource utilization is reasonable, and the development of carbon neutralization in urban sewage treatment is powerfully promoted.

The invention discloses a method for preparing a core-shell structure phase hydrorefining catalyst, comprising the following contents: (1) gelling, aging and filtering a first precipitant, a sodium molybdate solution and a solution containing Ni and Si to obtain a filter cake of a first slurry, and then treating it with a mixed aqueous solution of aluminum salt and organic alcohol to obtain a mixed slurry; (2) adding a Ni-containing solution, a sodium tungstate solution, a second precipitant and the mixed slurry obtained in step (1) to a reactor containing water and an oily liquid to gel and age them to generate a second slurry; (3) filtering, drying and molding the slurry to obtain a molded product; (4) soaking the molded product in an organic acid solution, and desalting the soaked molded product to obtain a catalyst. The preparation process of the method is clean and pollution-free, and the prepared catalyst has a core-shell structure, a large pore volume and a large pore size, and is used in processes such as distillate hydrodesulfurization and denitrogenation, and has high hydrodesulfurization and hydrodenitrogenation reaction performance.

The invention relates to the technical field of organic wastewater resource utilization, in particular to a device and method for preparing a composite carbon source from high-concentration organic wastewater, and the device comprises a hydrolysis device, an acidification device, a separation device and a concentration device which are connected in sequence; the hydrolysis device and the acidification device are respectively provided with an up-flow type hydraulic circulation stirring system, and are provided with a labyrinth inclined plate and an effluent weir in a matched manner, so that low-consumption and high-efficiency mud-water separation can be realized; through an intelligent adjusting system, the temperature and pH value in the hydrolysis and acidification process can be automatically controlled, the fermentation efficiency of the material can be improved, the preparation period of the carbon source can be shortened, and the stability of the product can be improved; the quality of the carbon source is further improved through physical processes such as membrane separation and membrane concentration; the high-concentration organic wastewater generated in the processing process of organic garbage and agricultural products is converted into a high-added-value recycling product, and the high-concentration organic wastewater is applied to the denitrification process of a sewage treatment plant, so that the denitrification performance is improved, and the recycling utilization of the high-concentration organic wastewater is realized.

The invention belongs to the technical field of sewage treatment, and particularly relates to an intelligent response filter material, a preparation method thereof and a denitrification deep-bed filter tank. The intelligent response filter material is of a three-layer composite structure and sequentially comprises a carbon source inner core, a transition layer and a wrapping layer from the inner layer to the outer layer; the carbon source core comprises aquatic plant powder, aggregate and reinforced fibers, the transition layer adopts a hydrophilic modified porous carrier, and the wrapping layer adopts a pH responsive polymer. According to the invention, the intelligent response type filter material prepared from aquatic plant straws is adopted, and the pH response type envelope can automatically adjust the release rate of a carbon source according to the pH change caused by the denitrification process, so that intelligent on-demand supply of the carbon source is realized, and the denitrification efficiency and the utilization rate of the carbon source are greatly improved.

The invention discloses a sintering flue gas desulfurization and denitrification method and a device thereof, relates to the technical field of desulfurization and denitrification, and solves the technical problems of low desulfurization and denitrification efficiency, relatively high ammonia escape rate and increased operation cost caused by insufficient control accuracy and difficulty in real-time and efficient adjustment of desulfurization and denitrification process parameters. The distributed sensors are deployed to collect key parameters in real time, a mathematical model and a PID control algorithm are combined, the spraying amount of the desulfurizing agent, the ammonia escape rate and the catalyst operation temperature can be dynamically adjusted according to real-time data, accurate control over the desulfurization and denitrification process is achieved, the desulfurization and denitrification efficiency is improved, the ammonia escape rate is reduced, and resource waste is reduced; according to NOx concentration differences and reaction rate constants in different areas, the ammonia spraying amount is finely adjusted, the denitration effect is further improved, and it is ensured that flue gas emission reaches the standard.

The invention belongs to the technical field of sewage resource recovery, and discloses a sewage treatment plant front-end organic matter high-value recovery technology based on enzyme reaction, which comprises the following steps: adding a flocculating agent into sewage behind a grit chamber to promote a large amount of organic matters and colloids in water to precipitate, and then carrying out enzyme hydrolysis reaction on the precipitated flocculated sludge to obtain the high-value recovery of the front-end organic matters in the sewage. The flocculated sludge is promoted to be converted into small molecular acid composite high-value carbon sources such as acetic acid, propionic acid and butyric acid and is used for subsequent denitrification treatment; according to the invention, the consumption of an external carbon source in the denitrification process and resource waste and greenhouse gas emission caused by conversion of COD into carbon dioxide in the sewage treatment process can be reduced; the method is suitable for urban or industrial sewage treatment.

The application discloses a method for efficient denitrification and decarburization of kitchen waste and sludge co-fermentation anaerobic digestion effluent, which removes part of COD and ammonia nitrogen in the influent sludge by using a first SNAD, and maintains a certain amount of free ammonia of a certain concentration due to the high concentration of ammonia nitrogen and the high pH of the influent, so as to maintain the inhibition effect on nitrifying bacteria and ensure the conversion of part of the ammonia nitrogen into nitrite nitrogen, and the high activity of anaerobic ammonia oxidation bacteria is ensured in the first SNAD by limiting the aeration amount, so that the ammonia nitrogen and nitrite can be further removed; the effluent enters a nitrification tank, and the ammonia nitrogen is nitrified into nitrate nitrogen under the condition of nitrifying bacteria and sufficient aeration amount, and then enters a denitrification tank, and the denitrification process is carried out under the condition of heterotrophic denitrifying bacteria and sufficient carbon source, so that most of the nitrate nitrogen in the system is converted into nitrogen gas and removed, finally, the clear liquid is discharged after being filtered by an MBR membrane in a membrane tank, so as to achieve the purpose of efficient denitrification and decarburization of kitchen waste anaerobic digestion effluent.

The invention provides a biological method for synergistically immobilizing methane and carbon dioxide, which comprises the following steps: mixing activated sludge with microalgae, continuously introducing gas, and forming an algal-bacterial symbiont under the condition of continuous illumination; the method comprises the following steps: putting the algal-bacterial symbiont into a reactor, pumping sewage, introducing gas, and carrying out periodic operation according to a water feeding-aeration-precipitation-drainage mode; wherein the gas comprises methane and carbon dioxide, and the sewage comprises a carbon source, a nitrogen source and a phosphorus source. According to the method, the bacteria-algae particles can be obtained through culture, and the bacteria-algae particles can provide electrons for denitrification by using the soluble methane as an electron donor, so that the purposes of synchronously removing the soluble methane and denitrifying are achieved, and the denitrification process is optimized. The bacteria-algae particles can also realize fixation of methane and carbon dioxide, the sewage treatment process is optimized, and the problems that soluble methane is difficult to remove and carbon emission is high in the existing sewage treatment process are solved.

The invention discloses an enzyme source particle carrier and a preparation method and application thereof, and relates to the technical field of microbial carriers, the enzyme source particle carrier comprises denitrification inner layer particles, a nitride, activated carbon, water, a polyurethane prepolymer, an initiator and a catalyst; the denitrification inner layer particles comprise the following components: a denitrifying substance, activated carbon, a polyurethane prepolymer, an initiator and a catalyst. The enzyme source particle carrier provided by the invention enriches denitrifying bacteria and nitrifying bacteria at the same time, and adopts activated carbon to increase bacterial attachment sites in the particle carrier, so that the enzyme source particle carrier has better biological activity, mechanical strength and service life, and can better adapt to impact of complex water bodies, water quality and water quantity; and the nitrifying bacteria and the denitrifying bacteria are reasonably distributed in the enzyme source particle carrier, so that synchronous nitrification and denitrification are easily realized, and an efficient, energy-saving and carbon-source-saving denitrification process is achieved.

This invention discloses an optimization method and system for a multi-stage AO denitrification process with oxygen limitation, relating to the field of wastewater treatment technology. The method includes: analyzing the process characteristics of the multi-stage AO denitrification device with oxygen limitation to construct a multi-stage AO process chain; constructing a wastewater detection vector to generate a multi-stage AO control space; performing multi-node wastewater treatment decision combination to obtain a first wastewater treatment group; performing multi-dimensional risk constraint optimization to establish a second wastewater treatment group; performing quality evaluation optimization to obtain a third wastewater treatment group; and performing multi-round variational collaborative optimization on the third wastewater treatment group to treat the wastewater. This invention solves the technical problems of low treatment efficiency and unstable effluent quality in existing multi-stage AO denitrification processes with oxygen limitation, achieving optimization of the multi-stage AO denitrification process with oxygen limitation and improving wastewater treatment efficiency and effluent quality.

The invention relates to the technical field of water treatment, and discloses a sludge quality-divided reflux type aerobic-anoxic sulfur autotrophic activated sludge denitrification process. The process comprises the following steps: wastewater enters a sectional type aerobic tank, the wastewater enters the sectional type aerobic tank, organic matters are removed in a strengthened manner in a first section of aerobic tank, part of ammonia nitrogen is converted into nitrite nitrogen and nitrate nitrogen, and nitrification is strengthened in a second section of aerobic tank, so that the ammonia nitrogen is deeply removed; effluent of the sectional type aerobic tank enters an anoxic tank and is completely mixed with sulfur particles and activated sludge for sulfur autotrophic denitrification; effluent of the anoxic tank enters a secondary sedimentation tank for sedimentation, supernate is discharged, and bottom mud enters a hydrocyclone to be divided into heavy sludge and light sludge; the heavy sludge flows back to the front end of the anoxic tank, the light sludge flows back to the front end of the sectional aerobic tank, and the remaining sludge is discharged. According to the invention, sulfur autotrophic denitrification is deeply integrated into an activated sludge system, so that high-efficiency nitrogen removal without carbon source and internal reflux is realized.

The invention belongs to the technical field of sewage treatment, and particularly relates to a low-ammonia-nitrogen wastewater treatment method based on an iron-loaded particle activated carbon coupled anaerobic fluidized bed membrane bioreactor, a reaction system and application. The low-ammonia-nitrogen wastewater treatment method comprises the following steps: in an anaerobic fluidized bed membrane bioreactor, adding iron-loaded granular active carbon, inoculating mixed sludge, introducing to-be-treated low-ammonia-nitrogen wastewater for denitrification treatment, forming feed liquid circulation by the low-ammonia-nitrogen wastewater under the action of a circulating pump in the denitrification process, and discharging the low-ammonia-nitrogen wastewater to the anaerobic fluidized bed membrane bioreactor. The iron-loaded granular active carbon and the mixed sludge in the reactor are in a fluidized state, and then carrying out membrane separation to obtain effluent; the mixed sludge at least comprises nitrosation-anaerobic ammonia oxidation sludge and iron anaerobic ammonia oxidation sludge. Aiming at low-ammonia-nitrogen wastewater treatment at normal temperature, the method provided by the invention enables the low-ammonia-nitrogen wastewater in a normal-temperature environment to realize a good denitrification treatment effect under the synergistic effect of the iron-loaded granular active carbon and the mixed sludge.

The invention discloses an intelligent carbon source feeding control system based on a biological denitrification process. The intelligent carbon source feeding control system comprises an upper computer, a server, a PLC control cabinet, a dosing pump, a dosing pipeline, a process instrument and an algorithm engine. Wherein the algorithm engine is deployed on a server and comprises a front control module and / or a rear control module and a database, and the front control module and / or the rear control module are / is used for predicting the carbon source adding amount according to water inlet data, conducting iterative correction on the predicted carbon source adding amount according to water outlet indexes and process parameters and outputting the corrected carbon source adding amount; the PLC control cabinet is connected with the server, the dosing pump and the process instrument and used for uploading monitoring data of the process instrument to the algorithm engine and issuing the carbon source dosage output by the algorithm engine to the dosing pump. According to the system, carbon source feeding can be more refined and intelligent, and the operation stability of biological denitrification is ensured.

The invention discloses a method for realizing long-acting stable shortcut nitrification and denitrification phosphorus removal based on sludge sidestream treatment, and belongs to the field of biological sewage treatment. After the short-cut nitrification process, the denitrification process, the phosphorus removal process and the carbon removal process of sewage in the reactor are completed, activated sludge is divided into three directions, one part of the activated sludge is discharged to maintain the sludge age, the other part of the activated sludge continues to be subjected to the nitrogen and phosphorus removal process in the reactor, and a small part of the sludge with excellent denitrification and phosphorus removal performance is reserved to flow back to an independent storage pool. In the later period of operation, after the cell activity in the activated sludge is damaged due to accumulation of high-concentration nitrite nitrogen, the activated sludge retained in the early stage flows back to the reactor, so that the denitrifying phosphorus removal performance of the sludge is enhanced, and efficient and stable nitrogen and phosphorus removal is realized. The method realizes synchronous deep removal of nitrogen and phosphorus in sewage, is suitable for automatic operation, and is convenient for realizing accurate control and optimal management of the process.

The invention discloses a membrane bio-membrane reactor and a method for efficiently coupling biogas recycling and denitrification by using the same, and relates to a reactor and a method for recycling and denitrifying biogas by using the same. The invention aims to solve the technical bottleneck problems that the traditional denitrification process depends on an external carbon source and is high in cost, and the existing methane-based membrane bio-membrane reactor cannot fully utilize biogas resources. The invention discloses a membrane bio-membrane reactor. Comprising a biogas high-pressure gas cylinder, a high-pressure gas pressure reducing valve, a reactor main body, a hollow fiber membrane assembly, a reactor main body water outlet, a reactor main body water inlet, a water inlet device, a reflux device, a circulating water outlet, a circulating water inlet, a gas sampling port, a reflux device water outlet, a liquid sampling port, a pH measuring instrument, a water outlet liquid sealing device and an atmosphere communication port. The mechanism of'one source and two purposes' (serving as an electron donor and converting into a carbon source in situ) of biogas methane is the core of realizing efficient denitrification and biogas resource utilization.

The invention discloses an ammonium carbamate denitration agent pyrolysis box for preventing crystallization. The ammonium carbamate denitration agent pyrolysis box comprises a box body, a conveying belt, a first heating assembly and a second heating assembly. The ammonium carbamate powder is heated from the upper portion of the ammonium carbamate powder through the first heating assembly, the ammonium carbamate powder is heated from the lower portion of the ammonium carbamate powder through the second heating assembly, it is effectively guaranteed that ammonium carbamate is completely decomposed on the conveying belt, and the defect that a medium can only be heated and decomposed from a single face through traditional heating equipment is overcome. Ammonium carbamate powder is fully pyrolyzed on the conveying belt, so that the problem of pipeline blockage caused by caking of ammonium carbamate in the flue gas denitration process is avoided. The box body can ensure that ammonium carbamate is fully decomposed to generate enough ammonia gas for denitration reaction, so that the denitration efficiency is improved. As the ammonium carbamate is directly decomposed in the box body, the ammonia preparation method does not need to be carried out under a high-temperature condition like the traditional urea ammonia preparation method, the ammonia preparation efficiency is improved by 5.9%-23.5% and averagely improved by 14.70% compared with the urea, and the ammonia preparation energy consumption is reduced by 48.0%-65.0%.