211 results about "Nitrate nitrogen" patented technology

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 relates to the technical field of agricultural fertilizers, in particular to an enzymolysis fish protein type amino acid-containing water-soluble fertilizer and a preparation method thereof, the fertilizer is prepared from 50-70% of enzymolysis fish protein stock solution and other components; the stock solution is prepared by pulping aquatic product processing leftovers, adjusting the pH value to 6.5-7.5, adding specific compound protease for enzymolysis, and performing enzyme deactivation and centrifugation; the macroelement liquid contains nitrate nitrogen and ammonium nitrogen (2: 1-4: 1), and the microelement chelating agent is prepared by reacting a stock solution small molecule peptide with a specific salt. The fish protein enzymolysis stock solution is prepared from aquatic product processing leftovers, high-proportion small molecule peptide and amino acid are obtained through specific enzymolysis and other processes, and by matching with high-content macroelements in a specific nitrogen form, nutrition can be rapidly supplemented, and crop photosynthesis and dry matter accumulation can be improved; and moreover, all the components cooperate to regulate the growth of the crops and improve the stress resistance, and the surfactant also improves the utilization rate of the fertilizer and reduces waste.

The invention relates to the technical field of environmental microbial resource development and sewage denitrification. The invention discloses an efficient denitrification strain Paracoccus sp.N21 with a flocculation characteristic, which is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.34710. The invention further discloses a preparation method of the efficient denitrification strain Paracoccus sp.N21. The strain obtained by the invention can completely remove ammonia nitrogen within 12 hours and thoroughly remove nitrate nitrogen within 48 hours, the removal rate reaches 100%, and ammonia nitrogen is preferentially degraded in a mixed nitrogen source. The method has the unique advantages that the flocculation rate in the nitrification process and the flocculation rate in the denitrification process exceed 93.9%, and the usage amount of a flocculating agent can be greatly reduced. When actual kitchen wastewater is treated, the ammonia nitrogen removal rate reaches 100%, and the removal rate reaches up to 7.51 mg / (L.h). The application of the strain can effectively reduce the volume of a reactor, reduce energy consumption and operation cost, provides a new solution for simplifying a biological denitrification process, is particularly suitable for treating high-ammonia-nitrogen kitchen wastewater, and has remarkable environmental and economic benefits.

The application discloses a high-salt-resistant denitrifying bacterial strain and a microsphere preparation thereof, a preparation method and application thereof, relates to the technical field of environmental microorganisms and wastewater biological treatment. Pseudomonas sp. The classification name of the strain is Pseudomonas sp., the preservation number is CGMCC No. 36626, the strain is preserved in the China General Microbiological Culture Collection Center, and the preservation date is November 14, 2025. The preparation method of the microsphere preparation containing the strain comprises the following steps: carrying out strain amplification culture to obtain a bacterial liquid, mixing the bacterial liquid with porous starch and a protective agent, then performing vacuum freeze drying to obtain bacterial powder, and then mixing the bacterial powder with a sodium alginate solution, and dropping the mixture into a calcium chloride solution to obtain the microsphere preparation. The microsphere preparation can maintain a nitrate nitrogen removal rate of more than 80% after being stored at-18 to-22 DEG C or 20 to 25 DEG C for 28 days, and can be used for denitrification and nitrogen removal of low-carbon-nitrogen-ratio and high-salt wastewater (such as urine wastewater in a closed circulation system).

The invention relates to a low-concentration nitrate nitrogen removal and conversion method based on functionalized flowing electrode slurry, which comprises the following steps: in a low-concentration nitrate nitrogen polluted water body, using the functionalized flowing electrode slurry to carry out capacitive deionization treatment under external first voltage so as to realize selective adsorption and concentration of nitrate nitrogen, the functionalized flowing electrode slurry comprises a carbon material which is modified by functional groups and has electrocatalytic activity; and carrying out electrochemical reduction reaction on the functionalized flowing electrode slurry subjected to nitrate nitrogen concentration under external second voltage, and reducing the adsorbed nitrate nitrogen into ammonia, so as to realize removal and recycling of the nitrate nitrogen. According to the invention, through a two-step process design of first transfer and second conversion, and by adopting the functionalized flowing electrode slurry, the two problems of deep removal and resource recovery of low-concentration nitrate nitrogen are effectively solved.

The invention belongs to the field of intelligent control of sewage treatment, and particularly provides an anoxic tank nitrate optimization control method and system based on dynamic grading of total nitrogen in inlet water, a storage medium and equipment. Calculating a control value of nitrate nitrogen at the tail end of the anoxic tank; calculating the total amount of nitration nitrogen removed by the inlet water carbon source, calculating the total amount of nitration nitrogen needing to be removed by adding the carbon source according to the anaerobic tank-anoxic tank nitration nitrogen load, the total amount of nitration nitrogen removed by the inlet water carbon source and the anoxic tank nitrate nitrogen control value, and calculating the adding amount of the carbon source needing to be added according to the total amount of nitration nitrogen needing to be removed by adding the carbon source; and monitoring the actual nitrate nitrogen concentration at the tail end of the anoxic tank, comparing the actual nitrate nitrogen concentration with the nitrate nitrogen control value at the tail end of the anoxic tank, and adjusting the adding amount of the carbon source. By monitoring inlet water and process parameters in real time, integrating microbial assimilation, dynamically calculating the control threshold value of nitrate in the anoxic tank and then calculating the basic adding amount of the carbon source, it is guaranteed that the total nitrogen in total outlet water stably reaches the standard, and the consumption of the carbon source is reduced.

The invention discloses a sulfur autotrophic denitrification system monitoring and control method and system based on machine learning, and the method comprises the steps: collecting system operation parameter data in real time, inputting the system operation parameter data into a first machine learning model, and predicting the effluent nitrate nitrogen concentration of the system by the model; when the predicted concentration value is higher than a preset emission standard threshold value, an early warning signal is triggered; identifying key influence factors with high effluent nitrate nitrogen concentration value by adopting an SHAP interpretability analysis method, and carrying out quantitative sequencing on influence degrees of the factors; based on the obtained key influence factors and related data, a bimodal load management strategy or a precise chemical dosing strategy is selected and executed, and the effluent nitrate nitrogen concentration of the system is controlled within the emission standard threshold value range. The sulfur autotrophic denitrification system is subjected to monitoring-diagnosis-control closed-loop intelligent management, so that refined and active regulation and control of the sulfur autotrophic denitrification process are realized, and the operation stability, the treatment efficiency and the economical efficiency of the system are improved.

The invention discloses an intelligent carbon source dosing control system and method adopting a double-model control mode, and belongs to the technical field of sewage treatment. The method comprises the following steps: step 1, acquiring real-time online data of a sewage treatment plant and running state data of related instrumentation equipment; 2, judging whether the real-time online data and the running state of the corresponding instrument equipment are normal or not; 3, analyzing real-time online data of the biological tank, the deep denitrification unit and total effluent, and starting intelligent carbon source dosing control mode selection according to a treatment result; 4, selecting a total nitrogen control mode or a nitrate nitrogen control mode, and calculating the carbon source dosage of the biological tank and the deep denitrification unit; and 5, respectively adding a carbon source into the biological tank and the deep denitrification unit. According to the invention, a double-model architecture for respectively controlling nitrate nitrogen and total nitrogen is constructed, so that the problem of abnormity caused by a single control mode is solved, and the purpose of timely and accurately adding a carbon source can be achieved.

The present invention relates to a water treatment membrane, and more particularly, to a household water treatment membrane, which has an excellent nitrate nitrogen removal rate for raw water with high hardness component by introducing a bulky sulfonic acid group having a high surface negative charge concentration, a method of manufacturing the same, and a membrane module including the same.

The invention discloses a low-consumption green nitrogen removal method, and relates to a green nitrogen removal method of a sewage treatment plant. The method comprises the following steps: (1) mixing high nitrate nitrogen wastewater and high sulfur wastewater to obtain mixed wastewater; and (2) adding anaerobic sludge into the mixed wastewater, and stirring until the mixed treatment is stably operated to obtain nitrogen-removed wastewater. According to the invention, an operation mode is adopted under the conditions that carbon sources are saved and effluent is qualified, and finally, qualified emission, energy conservation and consumption reduction are realized.

The invention relates to the technical field of sewage treatment, in particular to a water body biotoxicity early warning system based on self-sustaining of denitrifying microorganisms. The early warning system comprises an early warning device, an early warning filtering system located at the front end of the early warning device, a nitrate nitrogen monitor located at the rear end of the early warning device, a carbon source storage tank used for storing a carbon source and a nitrate nitrogen storage tank used for storing nitrate nitrogen. The nitrate nitrogen monitoring instrument is used for monitoring the change of the concentration of nitrate nitrogen, so that the toxicity detection and early warning of inlet water are realized. The water body biotoxicity early warning system is arranged based on denitrifying bacteria, through the biofilm filler, the early warning system is high in impact resistance and better in stability in the use process, and meanwhile, the system is more stable and reliable in the use process in cooperation with a corresponding filtering-backflushing system, a filler stirring and flushing system and a parallel system; and the device is convenient to use and maintain, is more suitable for actual production, and has wide application and popularization prospects.

The invention discloses an iron-sulfur-carbon-based composite filler for removing florfenicol in tail water, and belongs to the technical field of water treatment materials. The composite filler is composed of charcoal, pyrite, a calcium base, a binder and zeolite in proportion, through the synergistic effect of all the components, an adsorption-reduction-degradation combined mechanism is achieved, and florfenicol in municipal tail water and aquaculture tail water is efficiently removed. The preparation method comprises the steps of ingredient mixing, roller granulation, maintenance forming and the like, is simple in process and low in cost, and can be used for recycling preparation of agricultural and mine wastes. The filler is suitable for constructed wetlands and other water treatment scenes, the removal rate of florfenicol reaches 80% or above, meanwhile, the filler has the removal effect on nitrate nitrogen and other pollutants, and wide application prospects are achieved.

This invention discloses a start-up method for a sulfur autotrophic activated sludge process, comprising: inoculation of activated sludge; internal circulation of activated sludge; a first stage of sulfur autotrophic denitrification acclimatization, wherein the supernatant recirculation ratio of the first stage is ≥400%, and the influent flow rate of nitrate nitrogen wastewater is ≤40% of the design flow rate; a second stage of sulfur autotrophic denitrification acclimatization, wherein the supernatant recirculation ratio of the second stage is greater than or equal to the supernatant recirculation ratio of the first stage; and a third stage of sulfur autotrophic denitrification acclimatization, wherein the supernatant recirculation ratio of the third stage is greater than or equal to the supernatant recirculation ratio of the second stage. The start-up procedure ends after the effluent nitrate nitrogen removal rate reaches the required level. According to the method of this invention, by combining a high proportion of recirculation with low load and low influent nitrate nitrogen wastewater, sufficient agitation of the sludge can be achieved, improving the proliferation rate of sulfur autotrophic denitrifying microorganisms while avoiding sludge loss, thus enabling rapid start-up in UASB denitrification denitrification units with a small to medium aspect ratio.

The utility model provides a dual-light-source deep ultraviolet miniature optical nitrate nitrogen turbidity sensor, which solves the problem that turbidity particles can interfere with an ultraviolet absorption spectrum of nitrate nitrogen and influence the detection accuracy in the prior art. A dual-light-source deep ultraviolet miniature optical nitrate nitrogen turbidity sensor comprises a detection cavity, and a light-emitting assembly and a receiving assembly are arranged on the two sides of the detection cavity; a deep ultraviolet light source emitter and a turbidity light source emitter are arranged in the light emitting assembly, a deep ultraviolet light source receiver and a turbidity light source receiver are arranged in the receiving assembly, the deep ultraviolet light source receiver is arranged opposite to the deep ultraviolet light source, and the turbidity light source receiver is arranged opposite to the turbidity light source. As the measurement result of the nitrate nitrogen is possibly interfered by the turbidity of the water body, the sensor can measure the turbidity of the water body firstly by integrating the turbidity light source and the receiver of the turbidity light source, and correspondingly compensate the measurement result of the nitrate nitrogen so as to reduce the interference of the turbidity on the measurement of the nitrate nitrogen.

The invention belongs to the technical field of wastewater and waste gas treatment, and discloses a method and a device for resource preparation of a sulfur autotrophic denitrification filler, and a nitrate-nitrogen-containing wastewater treatment method, the method comprises the following steps: S1, coal gas purification: preparing red mud slag into red mud slurry, and inputting the red mud slurry into a desulfurization and decarbonization unit to desulfurize and decarbonize coal gas; s2, material separation: carrying out solid-liquid separation on the used red mud slurry, drying the obtained solid, enabling the liquid to enter a freezing crystallization unit to obtain a crystallized solid phase and a concentrated liquid phase, and mixing the concentrated liquid phase with the used red mud slurry; and S3, filler preparation: preparing the dried solid into a carrier, and then mixing and loading the carrier with the crystallized solid phase to prepare the sulfur autotrophic denitrification filler. According to the method, resource utilization of hazardous waste can be achieved, the wastewater treatment cost is reduced, and the obtained filler can stably treat wastewater.

This invention discloses a slow-release fertilizer suitable for lateritic soils in Hainan, comprising a fertilizer core and a coating layer; the fertilizer core comprises the following raw materials in parts by weight: 10-20 parts isobutylene diurea, 1-3 parts 3,4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts dicyandiamide DCD, 20-30 parts humic acid, and 30-50 parts organic fertilizer; the coating layer comprises the following raw materials in parts by weight: 5-10 parts natural nanotube halloysite, 3-5 parts bentonite, 5-10 parts cyclodextrin, 1-3 parts polyglutamic acid, 1-3 parts wood vinegar, and 5-10 parts polyacrylamide. The isobutylene diurea, humic acid, and organic fertilizer of this invention can effectively replenish organic matter and nitrogen in iron-aluminate soil, maintain soil nitrogen levels, and effectively control the conversion of ammonium nitrogen to nitrate nitrogen in lateritic soil, thereby reducing nitrogen loss and achieving a stable supply of nitrogen. In addition, polyglutamic acid and polyacrylamide have strong water retention capacity, and the fertilizer core is coated with a coating layer to achieve slow release and water retention.

The invention relates to the technical field of electrochemical water treatment, in particular to desolventized high-entropy perovskite and a preparation method and application thereof. Comprising the following steps: dissolving a soluble La salt, a soluble Mn salt, a soluble Fe salt, a soluble Co salt, a soluble Cu salt and a soluble Zn salt in water together to obtain a metal ion solution; the preparation method comprises the following steps: mixing an aqueous solution of citric acid and ethylene glycol with a metal ion solution, and carrying out sol-gel treatment to obtain xerogel; and then carrying out calcination treatment on the xerogel to obtain the high-entropy perovskite. The high-entropy perovskite is subjected to desolventizing treatment to obtain the desolventized high-entropy perovskite with high activity and high selectivity, so that the problems of insufficient active sites, low conductivity and poor NH3 selectivity of the existing catalyst are solved. The method is applied to nitrate nitrogen electrocatalytic reduction reaction, and the problems that in the prior art, ammonia nitrogen recovery is high in energy consumption, acid-base-salt chemicals need to be additionally added, and the process is complex are solved.

This invention discloses the application of a salt-tolerant immobilized denitrifying microbial agent in denitrification of low-temperature saline river water. The salt-tolerant immobilized denitrifying microbial agent is placed in a net bag and evenly suspended in the river channel. The salt-tolerant immobilized denitrifying microbial agent uses zeolite as the immobilization carrier, and the immobilized microorganisms are salt-tolerant denitrifying microbial agents enriched and screened from rivers flowing into the sea. The dosage of the salt-tolerant immobilized denitrifying microbial agent is 2 g·L⁻¹. ‑1 The dosage is the mass-to-volume ratio of the immobilized denitrifying bacterial agent to the river water. The low-temperature saline river water is saline river water with nitrate nitrogen as the main pollutant. The temperature of the low-temperature saline river water is 10℃~25℃. During the denitrification process, a carbon source is added to the river water to maintain denitrification efficiency. This invention has demonstrated its feasibility in practical engineering applications through pilot-scale experiments. It can effectively remediate river pollution and solve the problem of severe and difficult-to-remediate water pollution in saline rivers.

The invention discloses a sludge circulating membrane biological sewage treatment device and method. Comprising a cylindrical shell, and four annular galleries are coaxially arranged in the cylindrical shell; a treatment tank is arranged in the middle of the fourth annular gallery in the center; an anaerobic zone and an anoxic zone are arranged in the first annular gallery positioned on the outer side; the first aerobic zone is positioned in the second annular gallery; the second aerobic zone is positioned in the third annular gallery; the third aerobic zone is positioned in the fourth annular gallery; the MBR pre-anoxic zone is arranged in the treatment tank; the first annular gallery and the second annular gallery at the tail end of the anoxic zone are communicated through a through-wall pipe; the second annular gallery, the third annular gallery and the fourth annular gallery are communicated through wall penetrating pipes. The MBR pre-anoxic zone is arranged to replace a traditional secondary sedimentation tank, dissolved oxygen and nitrate nitrogen in returned sludge are partially consumed in the MBR pre-anoxic zone, the influence on anaerobic microorganisms in the anaerobic zone is reduced, and meanwhile, the occupied area of sewage treatment equipment can be saved.

The invention discloses a method and system for synchronously removing nitrate nitrogen in wastewater and hydrogen sulfide in biogas based on iron circulation, and belongs to the technical field of industrial sewage treatment and biogas purification. According to the invention, iron ions are used as a medium to construct a closed cycle, and biogas and wastewater are synchronously purified; the method comprises the following steps: oxidizing hydrogen sulfide in biogas by using a ferric sulfate solution to generate ferrous sulfide, elemental sulfur and sulfuric acid; then sulfuric acid is separated from a mixture of ferrous sulfide and elemental sulfur through solid-liquid separation, then the ferrous sulfide and the elemental sulfur are subjected to autotrophic denitrification with nitrate in the wastewater under the action of thiobacillus denitrificans, and ferric hydroxide, nitrogen and sulfate are generated; and then the ferric hydroxide reacts with the separated sulfuric acid to regenerate a ferric sulfate solution which is reused in the desulfurization step. In the whole process, cyclic utilization of iron ions is achieved, hydrogen sulfide and nitrate nitrogen are synchronously converted into harmless nitrogen, elemental sulfur and sulfate, and the purposes of treating waste with waste and recycling resources are achieved.

The invention relates to an efficient sewage purification material based on a complex microbial inoculant and a preparation method of the efficient sewage purification material, and belongs to the technical field of sewage treatment. Alkali bacillus with outstanding stress tolerance constructs a stable and adaptive micro-ecological environment for heterotrophic nitrification compound bacteria and denitrification compound bacteria, ammonia nitrogen can be efficiently converted into nitrate nitrogen and then reduced into nitrogen, the nitrogen removal effect is greatly improved, meanwhile, functional bacteria degrade organic pollutants through metabolism, and the nitrogen removal effect is improved. An adsorption and degradation synergistic mechanism is formed by the microbial inoculum, a porous structure of the modified biochar and rich oxygen-containing functional groups, the biochar firstly efficiently adsorbs heavy metals and refractory organics in sewage, the concentration of pollutants is concentrated to construct an efficient reaction microenvironment, degradation of the organics by the microbial inoculum can effectively avoid adsorption saturation of the biochar, and the microbial inoculum and the biochar supplement each other, so that the biochar can be degraded more efficiently. And finally, synchronous purification of nitrogen and organic matters is achieved, and the method is suitable for removal of ammonia nitrogen in high-salt sewage.

The invention discloses a desulfurization ash-based denitrification nitrogen removal filter material as well as a preparation method and application thereof. The desulfurization ash-based denitrification nitrogen removal filter material is prepared from the following raw materials in parts by weight: 150 to 255 parts of elemental sulfur, 1 to 55 parts of calcium carbonate and 1 to 55 parts of desulfurization ash. The desulfurization ash-based denitrification nitrogen removal filter material can be used for nitrogen removal of nitrate nitrogen-containing wastewater, and the effect is excellent. According to the desulfurization ash-based denitrification nitrogen removal filter material, the sulfur electron donor material serves as a main active component, the main component in desulfurization ash is CaSO3, and + 4-valent sulfur contained in the desulfurization ash and 0-valent sulfur in sulfur have a synergistic effect, so that the oxidation reduction effect with NO3 <-> in water is effectively improved, and the denitrification effect is excellent; the industrial solid waste desulfurization ash and calcium carbonate are compounded to prepare the denitrification nitrogen removal filter material, so that the purposes of treating waste with waste, reducing cost and increasing efficiency are achieved, the dual purposes of high-value utilization of the industrial solid waste desulfurization ash and high-efficiency treatment of wastewater are achieved, and wide market prospects are achieved.

The application discloses application of a rice OsARF24 gene. The nucleotide sequence of the OsARF24 gene has an accession number of LOC4352211 in Genbank. The rice OsARF24 gene is a key element in an auxin signal pathway. Knocking out the OsARF1 can cause the expression amount of nitrogen metabolism related genes of the rice, the nitrate nitrogen absorption rate, the plant height and the yield of the rice to be reduced, and the nitrogen fertilizer utilization efficiency to be reduced in a comprehensive manner. The function of the OsARF24 gene in positively regulating the nitrogen fertilizer utilization efficiency of the rice is clarified, and a technical route for increasing the nitrogen fertilizer utilization efficiency of the rice by increasing the expression of the OsARF24 in the rice is provided.

The invention discloses a directional cultivation method for a sulfur autotrophic nitrogen removal filter material with a multi-gradient pore structure. The directional cultivation method specifically comprises the following steps: step 1, preparing raw materials; step 2, gradient mixing; thirdly, layered pressure forming is conducted; 4, controllable ablation hole forming is carried out; step 5, surface modification treatment; step 6, performance detection and optimization; 7, filter material application and effect evaluation; the nitrate nitrogen diffusion coefficient is increased by 35% and the reaction kinetic constant (k) reaches 0.23 h <-1 > through a three-stage pore system; the Zeta potential (-25mV) on the surface of the micropore promotes the adhesion of bacteria, and the forming time of a biological membrane is shortened by 30%; the solid deposition rate is reduced through the large-hole channel spacing design, and the operation cycle is prolonged to two times of that of a traditional filter material.

This invention belongs to the field of fertilizer additive technology, specifically relating to a Cu-containing additive. Ⅱ The coordination polymers, preparation methods, and applications are described. The preparation methods include: synthesizing N,N'-bis(3-pyridinecarboxamide)-1,2-ethane using nicotinic acid and 1,2-ethylenediamine as raw materials; and synthesizing Cu-containing polymers from N,N'-bis(3-pyridinecarboxamide)-1,2-ethane, CuCl2·2H2O, and 1,4-cyclohexane using a hydrothermal method. Ⅱ The coordination polymer [Cu(1,4-chdc)(3-dpye)]·3H2O is a blue crystal. The product prepared in this invention is used as a fertilizer additive in urea to reduce the conversion of urea N to ammonium nitrogen and ammonium nitrogen to nitrate nitrogen during urea application, thereby reducing the volatilization of NH3 into the air after urea application and the subsequent volatilization of N2O.

The present invention discloses a method for the rapid formation of denitrifying granular sludge and enhanced denitrification of high-nitrate nitrogen wastewater, belonging to the technical field of wastewater treatment. The method involves colonizing the succinic acid-producing microorganism A. succinogenes into sewage sludge. By leveraging its high adhesiveness and its promoting effect on denitrifying microorganisms, the method rapidly forms denitrifying granular sludge while simultaneously enhancing the denitrification of high-nitrate nitrogen wastewater. The method is simple to operate, requires no additional pH control, and generates no secondary pollution. It enables the rapid formation of stable, full-process denitrifying granular sludge, which reduces the system's acclimation period to high-nitrate wastewater, shortens the sludge cultivation cycle, and minimizes the accumulation and discharge of intermediate products, such as nitrite, during denitrification.

The application discloses a kind of water body nitrogen pollution isotope and biological tracer combined tracing method and system, the method includes the type and position of irrigation and drainage ditch of irrigation area to be researched to determine different pollution source area;Surface water sample and groundwater sample are collected in irrigation and drainage ditch, the sample is analyzed, the fluorescence peak intensity, nitrate nitrogen isotope abundance, nitrate oxygen isotope abundance and coprostanol concentration are determined;Based on sample analysis result, the contribution ratio of point source pollution source and non-point source pollution source of surface water and its load are determined;The contribution of groundwater non-point source pollution source and its load are determined.The present application comprehensively collects surface water and groundwater, and uses multi-technology nesting method to analyze the pollution source contribution and load of surface water and groundwater.By distinguishing point source and non-point source, and using nitrogen and oxygen double isotope technology to identify non-point source pollution, combined with biological marker coprostanol to distinguish livestock manure and domestic sewage, the specific contribution and load of each pollution source are effectively quantified.

The invention provides a strain for sewage treatment under low-temperature and low-carbon-nitrogen-ratio conditions and application of the strain, and belongs to the technical field of microbial fermentation treatment. The bacterial strain is Pseudomonas sp. HR2, the preservation number of the bacterial strain is CGMCC (China General Microbiological Culture Collection Center) No.32795, and the preservation date of the bacterial strain is November 25, 2024. The pseudomonas HR2 has the biggest characteristic of integrating two major functions of heterotrophic nitrification and aerobic denitrification. The ammonia nitrogen and nitrate nitrogen in sewage can be efficiently and synchronously removed under the conditions of low temperature of 2-10 DEG C and low carbon nitrogen ratio of C / N = 3-8. Therefore, the method effectively solves the problem of efficiency attenuation of a traditional denitrification technology in a low-temperature and low-carbon-source environment, and has the remarkable technical effects of process simplification, energy conservation, consumption reduction and cost control.

The invention discloses a sewage denitrification process prediction control method based on data driving, and the method comprises the steps: constructing a sewage denitrification process multi-step prediction model, obtaining a multi-step prediction output value through an iterative loop mode based on a controlled state variable and a control variable of a sewage denitrification process, and carrying out the prediction control of the sewage denitrification process. The controlled state variables comprise the nitrate nitrogen level and the dissolved oxygen concentration, and the control variables comprise the water inlet flow and the oxygen transfer coefficient; a transform network offline identification multi-step prediction model is adopted, and a sampled historical control variable and a controlled state variable are used as training input of the transform network; and constructing a target function, solving according to a gradient descent method to obtain an optimal control law under a target set point, and acting the optimal internal reflux and oxygen transfer coefficient on the sewage denitrification system to control the nitrate nitrogen level and the dissolved oxygen concentration. According to the method, the irregular time sequence dependency relationship among multiple variables in sewage treatment is captured through an attention mechanism, and a better tracking control effect is obtained.

This invention discloses a method for promoting the biodegradation of N,N-dimethylformamide and simultaneous denitrification. The method constructs a zero-valent iron (ZFE)-coupled biological treatment system, which not only accelerates electron transfer efficiency but also significantly increases the activity of DMF-degrading enzymes and nitrate reductases, synergistically promoting electron transfer and microbial metabolic activity, thereby enhancing the removal of DMF and nitrate nitrogen. Compared to biological treatment systems that only add activated sludge without adding ZFE, adding ZFE significantly improves the removal efficiency of DMF and nitrate nitrogen, making it suitable for the treatment of large-scale polluted water bodies or industrial wastewater.