784 results about "Nitrate nitrogen" patented technology

The invention relates to the field of fertilizers, in particular to a macroelement water-soluble fertilizer and a preparation method thereof.The preparation method comprises the steps that a composite biochar material is prepared from biochar, loaded metal modified biochar and an iron metal material, and then the composite biochar material is compounded with tripotassium phosphate, monopotassium phosphate, disodium octoborate tetrahydrate, zinc sulfate monohydrate and the like; the finally prepared fertilizer can realize accurate fertilizer supply, the iron metal organic framework material efficiently converts nitrate nitrogen into ammonium nitrogen and cooperates with a large amount of trace elements such as tripotassium phosphate, the requirements of crops at all stages are met, nutrients in key periods are guaranteed, pores of the composite biochar material adsorb the nutrients, nutrient slow release is realized, root system interpenetration resistance is reduced, stress resistance is enhanced, and the yield of the crops is increased. The soil conditioner has the advantages of simple preparation process, reduction of growth hindrance, optimization of soil aggregates, increase of pores, reduction of volume weight, improvement of ventilation, water permeability and water and fertilizer retention capabilities, substantial agricultural economy energization, substantial yield increase of crops, and wide application prospects.

The invention discloses a sewage plant carbon source accurate adding system and a control method thereof, and relates to the technical field of sewage treatment. A sewage plant carbon source accurate adding system comprises a sewage treatment unit, a chemical adding unit and a control unit, the sewage treatment unit comprises a biological tank and a secondary sedimentation tank, an outer backflow pipeline is arranged between the biological tank and the secondary sedimentation tank, the secondary sedimentation tank is communicated with the biological tank through the outer backflow pipeline, and the chemical adding unit is connected with the control unit. Wherein the biological tank comprises an anaerobic tank, an anoxic tank and an aerobic tank; based on the control unit, the theoretical dosage is calculated according to the nitrate nitrogen load needing to be removed by the external carbon source in the anoxic zone, feedforward calculation is performed on the effluent nitrate nitrogen target value of the anoxic zone, feedback calculation is performed according to the deviation between the actual measurement value and the target value of the effluent nitrate nitrogen of the anoxic zone, and the dosage is adjusted by combining feedforward and feedback calculation results. Therefore, accurate dosing of the sewage treatment unit is realized.

The invention provides a dynamic multi-objective optimization control method for a sewage treatment process based on probability and dimension joint prediction, and relates to the technical field of sewage treatment. Comprising the following steps: acquiring process data of a sewage treatment process, constructing an optimization objective function according to the predictor based on support vector regression and the process data; solving the objective function by using a dynamic multi-objective optimization algorithm and a fast elite multi-objective genetic algorithm based on probability and dimension joint prediction to obtain a group of Pareto optimal solutions; according to a group of Pareto optimal solutions, determining optimal set values of the dissolved oxygen concentration of the fifth zone and the nitrate nitrogen concentration of the second zone; and carrying out tracking control on the actual dissolved oxygen concentration of the fifth zone and the nitrate nitrogen concentration value of the second zone by utilizing a PID (Proportion Integration Differentiation) controller and the optimized set values of the dissolved oxygen concentration of the fifth zone and the nitrate nitrogen concentration of the second zone. The problem of low control accuracy of corresponding sewage treatment in the prior art is solved.

The invention relates to a Fenton-like functional filler which is prepared from 10-20% of iron particles coated with a carbonized film, 10-20% of aluminum sulfate modified straw, 20-30% of PBAT-coated calcium peroxide, 20-30% of diatomite and 10-30% of an adhesive. A processing method of a Fenton-like functional filler comprises the following steps: uniformly mixing iron particles coated with a carbonized film, aluminum sulfate modified straws, PBAT-coated calcium peroxide and diatomite, then adding an adhesive, mixing isocyanate serving as the adhesive with polyol according to a volume ratio of 1: 5, and continuously and uniformly mixing; then the mixed raw materials are injected into a mold coated with a release agent in advance, the mold temperature ranges from 40 DEG C to 60 DEG C, the foaming curing time ranges from 15 min to 20 min, and the Fenton-like functional filler can be obtained. The invention relates to an application of a Fenton-like functional filler in constructed wetlands. The method has the beneficial effects that the method is not influenced by temperature, and the removal effect of the constructed wetland on nitrate nitrogen and refractory COD (Chemical Oxygen Demand) can be obviously enhanced.

The invention provides a water quality multi-parameter detection method and system based on ultraviolet-visible light section spectroscopy, which are used for detecting turbidity, chemical oxygen demand and nitrate nitrogen concentration in a water sample. The method comprises the following steps: firstly, acquiring spectral data of a water sample, converting the spectral data into absorbance, then calculating influence factors of turbidity, chemical oxygen demand and nitrate nitrogen on a mixed sample spectrum, and dividing a spectral range into three characteristic spectral sections according to the influence factors, which correspond to the turbidity, the chemical oxygen demand and the nitrate nitrogen respectively. And finally, establishing a multi-parameter detection model by using a partial least squares PLS method for predicting turbidity, chemical oxygen demand and nitrate nitrogen concentration. According to the method, the interference of serious overlapping of multi-parameter spectral lines is avoided through segmented analysis of the spectrum, the detection precision is improved by utilizing a method of fusing the first-order derivative spectrum, and particularly, the effect in the aspect of nitrate nitrogen detection is remarkable. The method is easy and convenient to operate and low in cost, and a more effective technical means is provided for water quality monitoring and water environment protection.

The invention discloses an integrated autotrophic nitrogen removal treatment system with multiple operation modes, comprising: an A / O reactor, the A / O reactor comprising an anoxic zone and an aerobic zone; the ANAMMOX reactor is connected with the A / O reactor, and the ANAMMOX reactor comprises a first ANAMMOX reaction zone and a second ANAMMOX reaction zone; the MBR membrane separation device is connected with the ANAMMOX reactor, an MBR membrane assembly is arranged in the MBR membrane separation device, and the MBR membrane separation device is further connected with a water production unit and a sludge treatment unit; and the autotrophic nitrogen removal control unit is used for controlling the A / O reactor, the ANAMMOX reactor and the MBR membrane separation device. According to the invention, the water inlet proportion and the system operation parameters can be autonomously controlled and adjusted according to the change of the sewage quality, the whole / short-cut nitrification and denitrification coupled anaerobic ammonia oxidation reaction in different operation modes is realized, the removal of ammonia nitrogen and nitrate nitrogen is realized to the greatest extent, and the treatment targets of optimal treatment effect and lowest operation consumption are achieved.

The invention discloses a preparation method of a polydopamine modified biochar loaded Fe-Cu sodium alginate microsphere, which comprises the following steps: preparing biochar, modifying the biochar by using polydopamine, then loading the polydopamine modified biochar by using Fe-Cu, and finally obtaining the polydopamine modified biochar loaded Fe-Cu sodium alginate microsphere. According to the preparation method, the sodium alginate microspheres with different particle sizes can be prepared, the prepared sodium alginate microspheres have the function of adsorbing ammonia nitrogen, nitrate nitrogen, chlorobenzene, phosphorus, chromium ions and lead ions, the sodium alginate microspheres are used as the inner core to prepare anaerobic ammonia oxidation granular sludge, large density and good morphological support are provided for sludge particles, the problem of sludge bulking is avoided, and the anaerobic ammonia oxidation granular sludge can be prepared by using the sodium alginate microspheres as the inner core. The sewage treatment agent has the advantages that the settling performance is improved, the adsorption capacity on organic matters, ammonia nitrogen and heavy metals is enhanced, the sewage treatment effect is improved, and meanwhile, the sewage treatment agent is a biodegradable material and does not cause secondary pollution in the use process.

The invention discloses a device and a method for synchronously removing hydrogen sulfide waste gas and nitrate wastewater by using a sulfur autotrophic denitrification technology, and belongs to the technical field of biological deodorization and sewage treatment. The device mainly comprises a water tank, a sequencing batch reactor (SBR), a washing tower, a water pump, a fan and the like which are connected in sequence. The method comprises the following steps: the discharged hydrogen sulfide waste gas enters a washing tower and is contacted and absorbed with circularly flowing absorption liquid to form mixed liquid mainly comprising S < 2-> and S < 0 >; the mixed solution and nitrate wastewater (or secondary effluent of a municipal sewage treatment plant taking nitrate nitrogen as a main pollutant) enter an SBR (sequencing batch reactor) together, and autotrophic nitrogen removal is carried out through a sulfur autotrophic denitrification way by taking reduced sulfur (S2-and S0 as main components) in the mixed solution as electron donors. According to the method, the hydrogen sulfide waste gas and the nitrate waste water are economically, efficiently and synchronously removed finally, and a brand new thought is provided for combination of biological deodorization and deep denitrification of urban sewage.

The utility model provides a low-carbon high-efficiency biochemical system control system. The low-carbon high-efficiency biochemical system control system comprises an internal reflux control module, a carbon source adding module and a precise aeration module, the internal reflux control module is used for refluxing nitrate nitrogen required to be denitrified to the anoxic tank for denitrification; the carbon source adding module is used for giving the current required dosage through online nitrate nitrogen instruments arranged in an anoxic tank and an aeration tank according to dynamic nitrate nitrogen value comparison and variation trend comparison at the tail end of the anoxic tank; and the accurate aeration module reads the real-time numerical value of ammonia nitrogen at the tail end of the aeration tank, performs mean value calculation on the numerical value in each period, performs difference value calculation on the average value of ammonia nitrogen in the current period and the average value of ammonia nitrogen in the last period, and reaches the numerical value of dissolved oxygen through frequency adjustment of an aeration fan to run in a required operation interval. The control method of the low-carbon high-efficiency biochemical system aims to realize low-carbon high-efficiency accurate control of the biochemical system, aeration as required, addition of an external carbon source and control of internal reflux.

The invention discloses a solid composite carbon source for sewage denitrification and a preparation method thereof. The composite carbon source is prepared from the following components in parts by weight: 10 to 60 parts of sodium acetate, 10 to 30 parts of glucose, 10 to 30 parts of starch, 0.1 to 2 parts of yeast powder, 1 to 5 parts of cellulose and 0.1 to 0.3 part of glycosyl hydrolase. Sodium acetate in the composite carbon source can react quickly, an instantaneous carbon source is provided, glucose and starch can be utilized by microorganisms for a long time, and durability of the carbon source is guaranteed. The invention also provides a sewage treatment method using the composite carbon source, and the method comprises the following steps: adding the composite carbon source into sewage, and carrying out denitrification treatment. The addition amount of the composite carbon source is determined based on the C / N ratio in the sewage. By adding the composite carbon source, the content of nitrate nitrogen in sewage can be effectively reduced, so that the sewage treatment efficiency is improved. The composite carbon source exists in a solid form, is convenient to store and transport, and reduces the influence on the environment. The composite carbon source not only can obviously improve the sewage treatment effect and improve the effluent quality, but also can reduce the operation cost and additional cost, and has important significance for improving the environment.

The invention belongs to the technical field of sewage treatment, and discloses a two-stage MABR-based efficient denitrification system, method and application, the system comprises an MABR-PN / DN reactor, an MABR-PN / A reactor, a peristaltic pump, an aeration hollow fiber membrane module, a carrier, an aeration pump, a gas flowmeter, a pressure gauge and a liquid flowmeter, and the MABR-PN / DN reactor and the MABR-PN / A reactor are arranged along the vertical direction. According to the system, the series design of the MABR-PN / DN and the MABR-PN / A is utilized, the adverse effect of organic matter in sewage on anaerobic ammonia oxidation treatment of high-concentration ammonia nitrogen wastewater is reduced, nitrate nitrogen generated by the MABR-PN / A flows back to the first-stage MABR-PN / DN to achieve denitrification, the denitrification limitation of a single reactor and a single denitrification path is broken through, and the overall total nitrogen removal rate of the system is higher than 90%.

The invention provides a self-supporting carbon-based material loaded with iron nanoparticles as well as a preparation method and application of the self-supporting carbon-based material, and belongs to the technical field of preparation and application of an electrocatalyst for removing nitrate in sewage. The preparation method of the self-supporting carbon-based material loaded with the iron nanoparticles comprises the following steps: providing a carbon felt subjected to acid pickling and water bath heating; the method comprises the following steps: mixing an iron precursor and urea in a solvent to obtain a mixed solution containing iron salt; and mixing the carbon felt with the mixed solution containing the iron salt, and carrying out a hydrothermal reaction to obtain the self-supporting carbon-based material loaded with the iron nanoparticles. When the iron nanoparticle-loaded self-supporting carbon-based material provided by the invention is used as a cathode for electro-catalysis of nitrate-containing wastewater, a good removal rate and ammonia nitrogen selectivity are achieved, and the catalyst can keep relatively high nitrate nitrogen removal and ammonia nitrogen production effects under the conditions of acidity, neutrality, alkalinity and different initial nitrate concentrations; the method has the advantages of high removal efficiency, good ammonia nitrogen selectivity, strong stability and the like.

The invention provides an event-triggered recursive fuzzy neural network multivariable control method based on correlation entropy. The method comprises the following steps: acquiring sewage treatment process data; constructing an initial fuzzy neural network through the sewage treatment process data; constructing an event trigger structure adjustment mechanism, and performing structure adjustment on the initial fuzzy neural network through the event trigger structure adjustment mechanism to obtain an optimized fuzzy neural network; performing parameter updating on the optimized fuzzy neural network through the correlation entropy to obtain an updated fuzzy neural network; verifying the updated fuzzy neural network through a Lyapunov function to obtain a recursive fuzzy neural network; and performing variable control on the sewage treatment process through the recursive fuzzy neural network. According to the method, the sewage treatment process is controlled through the recursive fuzzy neural network, the problem that dissolved oxygen and nitrate nitrogen are difficult to control is solved, and the control accuracy and efficiency are improved.

The invention discloses a novel application of bacillus subtilis WJL-2, and relates to the technical field of microorganisms. The invention discloses a novel application of bacillus subtilis WJL-2. The preservation number of the bacillus subtilis WJL-2 is GDMCC65111, and the preservation number of the bacillus subtilis WJL-2 is GDMCC65111. The new application specifically comprises the following steps: improving soil, regulating and controlling the content of total nitrogen and organic carbon in the soil, regulating and controlling the activity of amylase / urease / cellulase in the soil, regulating and controlling the content of ammonium nitrate nitrogen in the soil, regulating and controlling the mineralization rate of the soil, regulating and controlling the nitration rate of the soil and regulating and controlling the ammoniation rate of the soil. After the strain WJL-2 is inoculated into the soil, the total nitrogen and organic carbon content of the soil is reduced, and the C / N is reduced; the activity of soil amylase is reduced, and the activity of urease and cellulase is increased; the content of ammonium nitrogen in the soil is in a trend of firstly increasing and then decreasing, and the content of nitrate nitrogen is continuously increased; the mineralization rate of soil organic nitrogen is accelerated, the ammoniation rate is in a trend of increasing first and then decreasing, and the nitration rate is in a trend of decreasing first and then increasing.

In a cooperative optimal control system, firstly, two-level models are established to capture the dynamic features of different time-scale performance indices. Secondly, a data-driven assisted model based cooperative optimization algorithm is developed to optimize the two-level models, so that the optimal set-points of dissolved oxygen and nitrate nitrogen can be acquired. Thirdly, a predictive control strategy is designed to trace the obtained optimal set-points of dissolved oxygen and nitrate nitrogen. This proposed cooperative optimal control system can effectively deal with the difficulties of formulating the dynamic features and acquiring the optimal set-points.

According to the data-driven adaptive optimization control method for the aeration process of urban sewage treatment, accurate aeration of a plurality of aerobic zones in the aeration process of sewage treatment is controlled, and the aeration energy consumption is reduced while the quality of outlet water is stabilized. According to the invention, a cascade prediction model based on the fuzzy neural network is designed, the dynamic coupling relationship between adjacent aerobic zones is learned, and the nitrate nitrogen concentration in the sewage treatment aeration process, the operation index of each aerobic zone and the future value of the dissolved oxygen concentration are accurately predicted; a self-adaptive optimization controller is designed, and a self-adaptive weight is introduced to dynamically adjust aeration of each aerobic zone so as to coordinate ammonia nitrogen removal requirements and energy consumption optimization of each aerobic zone. Experimental results show that the method can accurately control the aeration of each aerobic zone in the sewage treatment aeration process, improves the effluent quality in the sewage treatment process, and reduces the aeration cost at the same time.

The invention belongs to the field of sewage treatment, and discloses a two-phase mud film efficient synchronous nitrogen and phosphorus removal process. By integrating biological denitrification and chemical phosphorus removal technologies and adopting a two-phase treatment unit, efficient and synchronous removal of nitrogen and phosphorus in sewage is realized. According to the process, a biological treatment procedure of denitrifying bacteria and nitrifying bacteria under an anaerobic and aerobic alternating condition is utilized, and ammonia nitrogen and nitrate nitrogen in sewage are effectively removed by controlling reaction conditions and formation of a mud film. Meanwhile, ferric salt and polyaluminum chloride flocculants are used for chemical precipitation, phosphate ions form insoluble precipitates by adjusting the pH value and the adding amount, and activated carbon or a zeolite adsorption material is combined for adsorption, so that phosphorus is further removed. The method has the advantages of high treatment efficiency, low operation cost, simplicity and convenience in operation and wide applicability, and an efficient, economic and environment-friendly solution is provided for sewage treatment.

The present invention discloses a heterotrophic nitrifying Brevundimonas DB‑4 and its application, belonging to the field of microbial technology. The heterotrophic nitrifying Brevundimonas (Brevundimonas) DB‑4 was deposited in the General Microbiological Center of the China Microbiological Culture Collection Administration Committee on December 11, 2023, with a deposit number of CGMCC No.29279. The Brevundimonas DB‑4 provided by the present invention is derived from the decomposed matter of the mixed compost of bean cake and vegetable cypress, has a strong heterotrophic nitrification ability, can promote the conversion of ammonium nitrogen in the rhizosphere soil to nitrate nitrogen, and can effectively colonize in the soil, increase the nitrate nitrogen content in the soil and plants; at the same time, it has the ability to depotassium, thereby increasing the content of available potassium in the rhizosphere soil, can promote the improvement of crop quality, and can be widely used in the preparation of microbial fertilizers to improve the nitrogen conversion efficiency of fertilizers and reduce the application of chemical fertilizers.

The invention provides a full-spectrum water quality multi-parameter dynamic inversion method and a model construction method thereof, and belongs to the technical field of spectral analysis based on machine learning. By constructing a closed-loop optimization architecture of noise reduction, wavelength optimization, turbidity correction and adaptive modeling, high-precision detection of four water quality parameters of chemical oxygen demand, total organic carbon, total nitrogen and nitrate nitrogen is realized. According to the method, a variational mode decomposition and improved threshold translation invariant wavelet combined noise reduction algorithm is provided, a kurtosis-correlation coefficient dual index is adopted to screen noise components, a multi-translation average strategy is combined to suppress a pseudo-Gibbs phenomenon, and meanwhile, a global parameter collaborative tuning mechanism based on Bayesian optimization is designed; a cross-module hyper-parameter coupling space is established in the whole process of noise reduction, wavelength optimization, turbidity correction and modeling. Through a multi-dimensional feature enhancement mechanism, the model feature representation capability is improved by 35%, and an innovative solution is provided for multi-parameter online detection in a complex water quality scene.

The invention provides application of an OSK8 gene in promoting plant growth, and belongs to the field of molecular breeding. According to the application, the OSK8 gene is used for promoting plant growth. The invention provides an application of an OSK8 gene in promoting plant growth. The OSK8 gene promotes the plant height of seedlings and the growth of underground parts. Besides, the plant height of OE is greatly changed under the treatment of nitrate nitrogen with different concentrations, and the OE is sensitive to the change of the concentration of nitrate nitrogen, that is, the OSK8 gene affects the absorption of nitrogen, so that the OSK8 gene positively regulates and controls the growth of rice through nitrogen absorption, and an overexpression transgenic material of the OSK8 gene can improve the nitrogen fertilizer utilization efficiency.

The invention relates to a method for reducing nitrate nitrogen in wastewater into ammonia nitrogen by using a double-bacterium inoculant and application of the double-bacterium inoculant. The method comprises the following steps: respectively carrying out expanding culture, washing and resuspending on electron donating bacteria and dissimilatory nitrate reduction ammonium-producing bacteria, and then mixing in a co-culture medium for co-culture to form a double-bacteria microbial inoculum; the co-culture medium containing the double-bacterium agent is introduced into wastewater to be treated, and nitrate nitrogen in the wastewater is reduced into ammonia nitrogen in an anaerobic environment. According to the method, nitrate nitrogen in the wastewater can be reduced and converted into energy storage substances with high energy density, the problems of low utilization rate of ammonium nitrogen fertilizer and non-point source pollution can be solved, and the method has important value for nitrogen pollution control and agricultural green sustainable development.

A data-knowledge driven multi-objective optimal control method for municipal wastewater treatment process belongs to the field of wastewater treatment. To balance the energy consumption and effluent quality, a data driven multi-objective optimization model, including energy consumption model and effluent quality model are established to obtain the nonlinear relationship along energy consumption, effluent quality and manipulated variables. Meanwhile, a multi-objective particle swarm optimization algorithm, based on evolutionary knowledge, is proposed to optimize the set-points of nitrate nitrogen and dissolved oxygen. Moreover, the proportional integral differential (PID) controller is designed to track the set-points. Then the effluent quality can be improved and the energy consumption can be reduced.

The invention provides an anaerobic ammonia oxidation treatment system and method for wine-making wastewater, the treatment system removes COD (Chemical Oxygen Demand) in high-concentration organic wine-making wastewater through an anaerobic digestion unit, most of the wastewater is converted into biogas, then the biogas is subjected to dehydration, desulfurization and membrane separation of CO2 through a biogas treatment unit, and the biogas with the CH4 content of 90% or above is obtained and can be used for power generation; anaerobic digestion effluent enters an MBBR-PN / A unit for denitrification, then passes through a deep biochemical unit for further removal of nitrate nitrogen, finally enters a deep treatment unit for disinfection, and is discharged after reaching the standard; excess sludge generated by the units is adjusted by a sludge tank, dewatered by a filter press and then enters a fermentation tower, a compound fertilizer is prepared after composting, residual heat of distillation tower residue is collected by a heat energy recovery unit, and the residual heat is transferred to an MBBR-PN / A unit or an anaerobic composting fermentation tower according to seasons. According to the invention, coupling of the anaerobic digestion unit and the MBBR-PN / A unit is taken as a core process, so that raw water is prevented from being used as a carbon source supply, the recovery rate of organic matters in the system is enhanced, and resource utilization and up-to-standard discharge of the wine brewing wastewater are realized.

The invention discloses a straw returning water-nitrogen synergistic method based on a biochemical inhibitor, and belongs to the technical field of agricultural resources and environments. The straw returning water-nitrogen synergistic method based on the biochemical inhibitor comprises the following steps that in an annona squamosa-soybean interplanting system, a water-nitrogen synergistic agent is added into an annona squamosa-soybean interplanting system; the nitrogen release and straw decomposition process is regulated and controlled through the synergistic effect of the biochemical inhibitor and water management, short-term crop requirements and long-term soil fertilization are both considered, and the water and nitrogen utilization efficiency is improved. According to the invention, a comprehensive strategy of'regulation and control of nitrogen release by a biochemical inhibitor and collaborative management of water and nitrogen 'is adopted. Release of nitrogen fertilizer is delayed through the urease inhibitor, straw decomposition and crop requirements are matched, and short-term nitrogen starvation of soybeans is avoided; generation of nitrate nitrogen is reduced through the nitrification inhibitor, nitrogen leaching and denitrification loss are reduced, and the nitrogen fertilizer utilization rate is increased; the irrigation amount is adjusted according to the straw decomposition stage and the crop growth stage, microbial decomposition is driven, and meanwhile the carbon conversion efficiency is improved.

The invention discloses a tubular dynamic membrane sulfur autotrophic denitrification device and method, the device comprises: a housing, which is composed of a middle cylindrical structure and two end hemispherical structures, the upper part of the cylindrical structure is provided with a purified water outlet, the lower part is provided with a backwashing port, and the top end of the hemispherical structure is respectively provided with a sewage inlet and a concentrated liquid outlet; the plurality of supporting bodies are arranged in parallel, each supporting body is composed of two layers of honeycomb-shaped PVC grids and a layer of polypropylene net, and the polypropylene net is clamped between the two layers of honeycomb-shaped PVC grids; the two splitter plates are fixed to the two ends of the supporting body respectively, and splitter holes corresponding to the supporting body are formed in the splitter plates; a large-aperture polypropylene net is used as a filtering support body, and powdered sulfur is used as a precoating agent, so that the problems of difficulty in powdered sulfur recovery and serious loss in the traditional sulfur autotrophic process are solved; meanwhile, sulfur powder with a certain particle size is used as a dynamic membrane reactor of a precoating agent, nitrate nitrogen can be efficiently removed, the effluent quality is improved, and meanwhile the dynamic membrane reactor has the advantages of being resistant to pollution and easy to clean.

The invention relates to the technical field of saline-alkali soil improvement, in particular to a compound conditioner for treating sulfate type saline-alkali soil and application of the compound conditioner. The compound conditioner is formed by compounding hydrotalcite, acidic zeolite and humic acid; wherein the hydrotalcite is nitrate intercalated MgAl-LDH or MgFe-LDH, and the molar ratio of divalent metal ions to trivalent metal ions of the hydrotalcite is (2: 1)-(4: 1); the acidic zeolite is clinoptilolite treated by a nitric acid solution; the humic acid is mineral source humic acid, and the purity of the humic acid is greater than 80%. The compound conditioner disclosed by the invention can mineralize Na < + > and SO4 < 2-> which are too high in content in saline-alkali soil, reduce the salt content and pH and prevent plants from osmotic stress and alkaline toxicity; the content of nitrate nitrogen and organic matters in soil is increased, and nutrient substances are provided for plants; the soil structure is improved, the water-retaining property and the air permeability are enhanced, the soil bulk density is reduced, and plant germination and root growth are facilitated.

The invention relates to a method for realizing rapid nitrous accumulation through short-cut nitrification and endogenous short-cut denitrification coupled flora, and belongs to the technical field of nitrogen-containing sewage treatment in environmental protection. According to the method disclosed by the invention, short-cut nitrification and endogenous short-cut denitrification coupling is realized, rapid nitrous accumulation can be realized, an organic carbon source does not need to be consumed, and the consumption of substances and energy is reduced. Meanwhile, the method provided by the invention not only can be used for treating the wastewater containing ammonia nitrogen, but also can be used for treating the wastewater containing nitrate nitrogen, solves the problem that nitrate nitrogen is generated due to partial whole-process nitrification in short-cut nitrification, and can ensure high-efficiency and long-term stable accumulation of nitrous; and a quick starting method is provided for a sewage plant adopting a short-cut denitrification related process.

The invention relates to the technical field of sewage treatment, in particular to a multi-point water inlet intelligent control method and system based on an A-AAO sewage treatment process. The inlet water carbon-nitrogen ratio is input into a feedforward control module, and basic flow distribution weights leading to water inlet pipelines of the pre-anoxic zone, the anaerobic zone and the anoxic zone are generated based on the numerical range of the inlet water carbon-nitrogen ratio; inputting the ORP value of the pre-anoxic zone, the ORP value of the anaerobic zone, the ORP value of the anoxic zone and the effluent nitrate nitrogen concentration parameter into a feedback control module, and generating a correction factor for distributing the weight to the inlet water of each zone and a mixed liquid reflux ratio adjusting instruction; the basic flow distribution weight and the correction factor are fused, and after normalization processing and proportion range constraint are carried out, a final water inlet flow distribution instruction is generated; according to the method, the overall nitrogen and phosphorus removal effect can be improved, the inflow load fluctuation resistance of the system is enhanced, and stable and efficient operation is achieved.

The invention belongs to the technical field of artificial wetland regenerated water treatment, and particularly relates to an enhanced removal method for nitrate nitrogen and organic matters in an artificial wetland regenerated water source. According to the method, glucose, manganese ions and copper ions are added into a regenerated water source, heterotrophic bacteria are enriched in a constructed wetland packed bed, metal ions are loaded in the constructed wetland packed bed, extracellular active enzymes are generated through stress reaction of the heterotrophic bacteria to the metal ions, and then the enzymolysis process of humus organic matters difficult to biodegrade is achieved. The biodegradability of the recycled water is improved, and finally, the removal process of nitrate nitrogen and organic matters is enhanced.

An ecological combined constructed wetland system for rare earth mine tail water treatment is characterized in that a downward vertical flow wetland and an upward vertical flow wetland of a three-stage combined wetland system are communicated through a bottom communicating pipe, and the upward vertical flow wetland and a floating island wetland are communicated through an upper overflow weir; the tail water treated by the sewage adjusting tank sequentially flows through the downward vertical flow wetland, the upward vertical flow wetland and the floating island wetland; each of the downward vertical flow wetland and the upward vertical flow wetland comprises a filler layer with a three-layer structure, and the upper layer is a plant substrate layer and is composed of fine sand or sandy loam; the middle layer is a functional material layer and is composed of hematite, zeolite or activated carbon; the lower layer is a supporting layer and is composed of coarse sand or gravel; and the aquatic plants of the floating island wetland adsorb pollutants in the water body through root systems, and decompose residual pollutants by utilizing the metabolism of the plants. The tail water treatment device can efficiently remove particular pollutants such as ammonia nitrogen, nitrate nitrogen, heavy metals and rare earth elements in the tail water of the rare earth mine.