28 results about "Sulfur cycle" patented technology

The invention discloses a staged regulation and control sulfur cycle enhanced denitrification microbial community construction method, and belongs to the technical field of environmental biologication.The method comprises the three stages that in the first stage, low-carbon-nitrogen-ratio domestication culture is conducted, the carbon-nitrogen ratio is 1.5-2.5: 1, and domestication is conducted for 50-70 days; in the second stage, electron donor-acceptor ratio regulation culture is carried out, the / molar ratio is (4-6): 1, and culture is carried out for 15-25 days; in the third stage, pulse type sulfate is fed for enhanced culture, the single-time feeding concentration is 200-500 mg / L, culture is conducted for 8-15 days, real-time monitoring is conducted through the fluorescence in-situ hybridization technology, construction is completed when the abundance of sulfur autotrophic denitrifying bacteria reaches 28% or above, and when the microflora constructed through the method is used for treating low-carbon-nitrogen-ratio industrial wastewater, the sulfur conversion rate is 1.2-2.0 kg / (m.d), the system stability is good, and the application range is wide. And the impact load resistance is high.

The invention relates to an advanced oxidation and sulfur circulation coupled wastewater treatment system and method with wastewater advanced treatment, the advanced oxidation system comprises a first feeding pump, a first UASB reactor and a first feeding device, the first feeding pump is used for conveying to-be-treated wastewater to the first UASB reactor, and the first feeding device is used for conveying the to-be-treated wastewater to the second UASB reactor; the first feeding device is used for adding an advanced oxidation reactant into the first UASB reactor so as to carry out advanced oxidation reaction in the first UASB reactor; the sulfur circulation biological denitrification system comprises a second feeding pump, a second UASB reactor, a dissolving water tank and a second feeding device, the second feeding device is used for adding reaction materials into the dissolving water tank, and the second feeding pump is used for conveying treated wastewater from the dissolving water tank to the second UASB reactor; the treated wastewater and the reaction bacteria in the second UASB reactor are subjected to a sulfur cycle biological denitrification reaction; the efficient and economical treatment on the wastewater containing pollutants such as complex-state metals and nitrogen oxides is realized.

The application relates to a method and device for degrading ethion and recycling heavy metals simultaneously based on an endogenous sulfur cycle, and belongs to the technical field of dressing wastewater treatment. The device is mainly composed of sequentially connected MABR and H2-MBfR. In the method, ethion is oxidized and degraded to produce CS2 and ammonia nitrogen under aerobic conditions in the MABR, and the CS2 is further converted into sulfate; the ammonia nitrogen is nitrified into nitrate nitrogen and nitrite nitrogen. Subsequently, the effluent enters the H2-MBfR, and under anaerobic conditions, the nitrate nitrogen and the nitrite nitrogen are reduced into nitrogen gas by taking hydrogen as an electron donor, and the endogenous sulfate is reduced into sulfur ions; the sulfur ions react with heavy metal ions in situ to generate metal sulfide precipitates. Finally, the precipitates are recovered through solid-liquid separation and are reused for metal flotation. The application realizes directional conversion and collaborative removal of pollutants, does not produce secondary pollution, and realizes recycling of heavy metal resources by using the sulfur element of the pollutants.

The invention discloses a method for rapidly constructing denitrification type anaerobic methane oxidation through hydrogen type methanogens, and relates to the technical field of sewage treatment. According to the method, anaerobic digestion sludge of a sewage treatment plant is taken for inoculation, and a methanogen-mediated denitrification type anaerobic methane oxidation process is constructed. Hydrogen-type methanogens in the anaerobic digestion system excite a reverse methanogenesis function under the condition that organic matters are deficient, and denitrification anaerobic methane oxidation is realized by coupling sulfate and nitrate with nitrogen and sulfur circulating microorganisms. Sulfate is used as a potential electron acceptor in sewage, and dissoluble methane is removed while sulfate is indirectly utilized through recessive biological sulfur cycle catalytic bridging anaerobic methane oxidation and denitrification. In addition, the anaerobic digestion sludge can be continuously inoculated with hydrogen-type methanogens, and compared with traditional denitrification type anaerobic methane oxidation archaea culture, the method is more convenient. Therefore, the denitrifying anaerobic methane oxidation rapidly constructed by the hydrogen-type methanogens is an effective measure for breaking through the deep denitrification of the sewage treatment plant and synchronously controlling and discharging the greenhouse gas.

The present invention relates to the technical field of silicate cement clinker preparation, and specifically discloses a self-carbonizing enhanced high-potassium silicate cement clinker and its preparation method and application. The mineral composition of the cement clinker comprises, by mass percentage, C3S-M1 15.97-18.35%, C3S-M3 35.83-36.34%, C2S-α' L 18.99~20.57%, C2S-β 1.3~2%, C3A-c 0.09~0.72%, C3A-o 12.71~15.33%, C4AF 9.24~10.91%, secondary free CaO 1.28~1.48%. The present invention not only reduces the harm of crusting and ringing caused by alkali-sulfur cycle, but also utilizes C2S-α' L Due to the difference in hydration rates between C3A‑o and C3A‑o, the clinker system can release K continuously but not concentratedly after contact with water. + Ions ensure that the alkalinity will not decrease during the hydration process, provide a good alkaline environment for carbonization, and improve the mechanical strength.

The invention discloses a green low-carbon treatment device for landfill leachate. The method belongs to the field of landfill leachate treatment. The problems of durability, biological accumulation and toxicity caused by the existing landfill leachate are solved. The device comprises a landfill leachate collecting tank, a three-dimensional electrolysis pretreatment tank, a sulfur circulation multi-stage anaerobic biological treatment tank, a sedimentation tank, an ozone catalysis device and a tail end biological enhancement filter tank which are connected in sequence. According to the invention, the removal of ammonia nitrogen, total phosphorus and refractory organic matters and the reduction of sludge in the biological treatment section are realized, and the effluent is ensured to reach the discharge standard in Pollution Control Standard for Household Refuse Landfill (GB 16889-2008). According to the invention, full quantification and low carbonization of landfill leachate treatment are realized, and the treatment cost is greatly reduced. According to the present invention, the environmental pollution problem can be easily solved, the water resource and the ecological environment can be protected, the technical progress and the industrial upgrading of the water treatment industry can be promoted, and the implementation of the green development and the sustainable development strategy can be promoted.

The invention discloses a system and a method for preparing methanol by coupling mixed sulfur circulating hydrogen production with carbon capture. The system comprises a flue, a booster fan, a sulfur dioxide absorption device and the like, the method comprises the following steps: introducing sulfur-containing flue gas subjected to boiler denitration and dust removal into a sulfur dioxide absorption device; atomizing and spraying water to the top of the absorption device, fully contacting sulfur dioxide in the flue gas and return liquid of the electrolyte collection device, and reacting to generate a mixed solution of sulfurous acid and sulfuric acid; indissolvable nitrogen and carbon dioxide in the flue gas enter a flue gas discharging device; hydrogen separated out from the cathode of the electrolysis device enters a hydrogen collection tank, and a sulfuric acid solution generated from the anode enters an electrolyte collection device; part of solution in the electrolyte collection device returns to the absorption device for cyclic utilization, and part of high-concentration sulfuric acid is collected; gas in the flue gas discharging device enters the deoxidizing device; the deoxygenated gas and residual hydrogen enter a methanol preparation device, and methanol is generated under the action of a catalyst. Waste gas resource utilization is achieved, and hydrogen production energy consumption is reduced.

The invention relates to the technical field of water treatment, in particular to a FeS2 nanoflower preparation technology and a wastewater nitrogen and phosphorus removal treatment method using pseudomonas immobilized by the FeS2 nanoflower preparation technology, and the method comprises the following steps: firstly, synthesizing FeS2 nanoflowers, including preparation of an iron oxide precursor, preparation of a flower-shaped alpha-Fe2O3 nano material and preparation of a flower-shaped FeS2 nano material; then carrying out co-culture on the FeS2 nanoflowers and pseudomonas to form a composite treatment system; and finally, introducing the wastewater containing nitrogen and phosphorus into the composite treatment system for nitrogen and phosphorus removal treatment. In the treatment process, the FeS2 nanoflower serves as a carrier to provide a place for growth of pseudomonas, an electron donor is provided through surface sulfur circulation (S < 2->-> SO4 < 2->), and the coupling reaction of denitrification and phosphorus precipitation is promoted. The prepared FeS2 nanoflower can efficiently enrich pseudomonas, and the prepared FeS2 and the pseudomonas are co-cultured to treat sewage, so that nitrogen and phosphorus can be efficiently removed.

The utility model provides a wind-light fuel gas heat storage hydrogen production system based on elemental sulfur, which comprises a wind-light power generation unit used for collecting wind energy and solar energy, converting the wind energy and the solar energy into electric energy and transmitting the electric energy; the electric heater is connected with the wind-solar power generation unit so as to convert electric energy into heat energy; the heat storage unit comprises an elemental sulfur high-temperature storage tank and an elemental sulfur low-temperature storage tank; the water electrolysis hydrogen production unit is used for electrolyzing water to produce hydrogen; the heat exchanger comprises a first side which exchanges heat and is connected with the heat storage unit and a second side which is connected with the water electrolysis hydrogen production unit; the first sulfur circulating pump and the second sulfur circulating pump are used for providing circulating power for elemental sulfur; and the elemental sulfur high-temperature storage tank, the first sulfur circulating pump, the first side of the heat exchanger, the elemental sulfur low-temperature storage tank, the second circulating pump and the electric heater are sequentially connected to form an acting loop of elemental sulfur. According to the utility model, the utilization efficiency of energy can be improved.

The application provides a sulfur-mediated anaerobic-anoxic-aerobic coking wastewater treatment method and system. The method is characterized by inoculating specific bacteria in an anaerobic reactor, an anoxic reactor and an aerobic reactor which are sequentially connected, and then making the coking wastewater to be treated sequentially pass through the anaerobic reactor, the anoxic reactor and the aerobic reactor, and then precipitating in a sedimentation tank, so as to realize wastewater treatment. In the above process, the coking wastewater to be treated sequentially passes through the anaerobic reactor inoculated with sulfate-reducing bacteria, the anoxic reactor inoculated with sulfur autotrophic denitrifying bacteria and the aerobic reactor inoculated with nitrifying bacteria, and the "sulfur cycle" is embedded in the coking wastewater treatment process, so that various pollutants in the coking wastewater can be effectively removed.

The invention relates to an advanced oxidation and sulfur circulation coupled wastewater treatment system and method with wastewater pretreatment, the advanced oxidation system comprises a first feed pump, a first UASB reactor and a first feeding device, the first feed pump is used for conveying pretreated wastewater to the first UASB reactor, and the first UASB reactor is used for conveying the pretreated wastewater to the second UASB reactor; the first feeding device is used for adding an advanced oxidation reactant into the first UASB reactor so as to carry out advanced oxidation reaction in the first UASB reactor; the sulfur circulation biological denitrification system comprises a second feeding pump, a second UASB reactor, a dissolving water tank and a second feeding device, the second feeding device is used for adding reaction materials into the dissolving water tank, and the second feeding pump is used for conveying treated wastewater from the dissolving water tank to the second UASB reactor; the treated wastewater and the reaction bacteria in the second UASB reactor are subjected to a sulfur cycle biological denitrification reaction; the efficient and economical treatment on the wastewater containing pollutants such as complex-state metals and nitrogen oxides is realized.

The present invention is applicable to the desulfurization and decarbonization of a process gas containing sulfur oxides and CO2, and belongs to the field of environmental protection. Ammonia is used as a desulfurizing and decarbonizing agent. The gas enters first a desulfurization apparatus for desulfurization, to produce an ammonium sulfate fertilizer. The desulfurized gas enters a decarbonization apparatus to remove carbon dioxide in the gas, and to produce an ammonium bicarbonate fertilizer. The decarbonized gas, that contains free ammonia, is washed with a desulfurization circulating fluid and then with water. The washing fluids are returned to the desulfurization tower for use as an absorbing agent for desulfurization. This technology integrates decarbonization and desulfurization technologies organically, and uses acidic desulfurization circulating fluid to wash ammonia, thereby achieving a high ammonia washing efficiency and solving the ammonia slip problem suffered by decarbonization processes. The process is simpler, the investment and operation costs are low, ammonium sulfate and ammonium bicarbonate fertilizers are co-produced, and there is no need to inject all of CO2 back to underground for sequestration. Rather, part of CO2 can be used to produce downstream products such as urea, soda ash, etc. The product mix can be flexibly adjusted, and by- product ammonia can be used, thereby realizing treating wastes with wastes and a circular economy. 20 24 21 65 02 30 A ug 2 02 4 2 0 2 4 2 1 6 5 0 2 3 0 2 0 2 4 A u g I N T E G R A T E D A M M O N I A - B A S E D D E S U L F U R I Z A T I O N A N D D E C A R B O N I Z A T I O N

The invention provides a paleo-climate change analysis method and system based on multi-source data fusion, and relates to the technical field of paleo-climate change analys.The paleo-climate change analysis method comprises the steps that volcanic and sulfur cycle related multi-source geochemical indexes are collected and processed in a standardized mode, time alignment is achieved in combination with a geology method, and the consistency and continuity of data are guaranteed; a multivariable causal structure is constructed based on a Bayesian network, volcanic events are set as hidden variables, modeling is carried out on observation indexes in combination with conditional Gaussian distribution, causal relationships and statistical characteristics among multiple indexes are mined, and the problems of data uncertainty and missing are solved; by dynamically calculating posterior probabilities of volcanic events and sulfur cycle anomalies, objective judgment based on probabilities is realized, volcanic-driven sulfur cycle disturbance events are accurately identified, and time matching and correlation analysis are performed in combination with paleoclimate event tags, so that an influence mechanism of volcanic activities on paleoclimate changes is disclosed.

This invention discloses a coupled system and method for flue gas desulfurization and iodine-sulfur cycle hydrogen production based on ammonium sulfite cycling. The system consists of an ammonium sulfite cycling desulfurization unit and a semi-open-ring iodine-sulfur cycle hydrogen production unit. The ammonium sulfite cycle achieves efficient capture and enrichment of SO₂ from flue gas, with zero ammonia consumption and no escape. It constructs a closed-ring iodine and open-ring / semi-open-ring iodine-sulfur hydrogen production system, using flue gas SO₂ as the external sulfur source. The traditional 850℃ high-temperature decomposition step of iodine-sulfur with sulfuric acid is eliminated; hydrogen is produced only by decomposing hydrogen iodide at 300–450℃. Iodine is recycled in a closed-ring manner, with sulfuric acid as a byproduct. This invention simultaneously achieves deep flue gas desulfurization, sulfur resource utilization, and low-cost hydrogen production, significantly reducing energy consumption and operating costs. It possesses excellent environmental and economic benefits and is applicable to sulfur-containing flue gas treatment and hydrogen co-production scenarios in thermal power, steel, coking, and chemical industries.

The invention relates to a water supply nitrate treatment system and method based on dynamic sulfur circulation and a fuel cell, the water supply nitrate treatment system comprises at least one level of standardization unit, the standardization unit is provided with an SR reactor for stage I reaction and an SRR reactor for stage II reaction which are connected in series, and at least one self-generating MFC module is arranged between the SR reactor and the SRR reactor; and the intelligent control unit is used for controlling each facility in the standardization units and centrally controlling the standardization units. According to the invention, internal circulation of sulfur elements and efficient removal of nitrate are realized through a double-stage dynamic sulfur circulation mechanism, the efficient MFC module is coupled to recover reaction chemical energy, and the intelligent control unit is utilized to realize self-adaptive operation of the system and the modular reactor group provides flexible expansion capability.

The invention relates to a method and a device for synchronously degrading ethyl, sulfur and nitrogen in beneficiation wastewater and recovering heavy metals based on endogenous sulfur circulation, and belongs to the technical field of beneficiation wastewater treatment. The device is mainly composed of an MABR and an H2-MBfR which are connected in sequence. The method comprises the following steps: oxidizing and degrading N, N-diethyldithiocarbamate under an aerobic condition to generate CS2 and ammonia nitrogen in an MABR, and continuously converting the CS2 into sulfate; ammonia nitrogen is nitrified into nitrate nitrogen and nitrite nitrogen. Then, effluent enters H2-MBfR, hydrogen is used as an electron donor in an anaerobic environment, nitrate nitrogen and nitrite nitrogen are reduced into nitrogen, and endogenous sulfate is reduced into sulfur ions; and the sulfur ions and the heavy metal ions are subjected to in-situ reaction to generate metal sulfide precipitates. And finally, the sediment is recycled through solid-liquid separation and reused for metal flotation. Directional conversion and synergistic removal of pollutants are achieved, secondary pollution is not generated, and heavy metal resource recycling is achieved through the sulfur element of the pollutants.

The application discloses a method for two-stage prediction and optimization of process performance of sulfur circulation coupled denitrification phosphorus removal, comprising: first, preparing data sets for sulfate reduction amount and phosphorus removal rate respectively; in the first stage, taking anaerobic stage process parameters as input, selecting machine learning algorithm, cross-validation method and search method to realize prediction of sulfate reduction amount; in the second stage, taking anoxic stage process parameters and sulfate reduction amount prediction value as input, selecting machine learning algorithm, cross-validation method and search method to realize prediction of phosphorus removal rate; in the model training process, the model is evaluated through the coefficient of determination R 2 and the root mean square error RMSE, and the optimal model is selected according to the evaluation result. According to the optimal model, a scheduling platform is built, and performance prediction and optimization control of the sulfur circulation coupled denitrification phosphorus removal system are realized according to the scheduling platform.

The present application relates to water treatment and aquaculture environmental protection technical field, and disclose a bypass sulfur cycle coupled seawater aquaculture tail water deep denitrification and phosphorus removal method and system, including main road and bypass double process: S1 solid-liquid separation obtains concentrated solid phase and main road clear liquid;S2 in bypass anaerobic reactor, concentrated solid phase organic matter is hydrolyzed and acidified, and then sulfate reducing bacteria is utilized, and reduced sulfate is generated into sulfide and releases phosphorus, and bypass fermentation liquor is obtained;S3 in side flow chemical phosphorus removal unit, reagent is added, and phosphorus precipitate is generated and recovered in a direction, and sulfur-rich supernatant is obtained;S4 in main road anoxic reactor, main road clear liquid, sulfur-rich supernatant and nitrification reflux liquid complete autotrophic denitrification;S5 in main road aerobic reactor, ammonia nitrogen is oxidized into nitrate, and part of effluent is refluxed.The present application realizes spatial decoupling of electron donor and acceptor, and double sludge age operation guarantees efficiency, and external carbon source is not needed, and denitrification and phosphorus removal and phosphorus resource recovery are realized, and the seawater aquaculture tail water quality is adapted.

The application discloses a method for preparing composite pyrophosphate sodium ferric phosphate by sulfur circulation, and comprises the following steps: S1, preparation of composite pyrophosphate sodium ferric phosphate: after wet mixing of ferrous sulfate, a sodium source, a phosphorus source and a dispersing agent, precursor is obtained by spray drying, and the precursor is calcined at high temperature under a protective atmosphere to obtain composite pyrophosphate sodium ferric phosphate; S2, tail gas recovery and conversion: the sulfur-containing tail gas generated in the high-temperature calcination process of the precursor and air pass through a multilayer vanadium pentoxide catalyst, and temperature control reaction is performed to realize conversion of SO2 into SO3, thereby obtaining SO3 tail gas; S3, SO3 tail gas collection and conversion: the SO3 tail gas is transferred into a sulfuric acid collector by temperature control transfer through a heat exchanger, and SO3 and H2O are cooled and converted into a sulfuric acid solution; S4, preparation of ferrous sulfate: an iron source is added into the sulfuric acid solution, heating reaction is performed, solid-liquid separation is performed, and a reducing agent is added after cooling to perform reaction, thereby obtaining ferrous sulfate used in the step S1. The application has the characteristics of low cost, high reversible specific capacity and green environmental protection.

The utility model relates to a UASB (Upflow Anaerobic Sludge Blanket) reactor based on denitrification of a sulfur circulating biological system. The UASB reactor comprises a reactor column body, a bottom cover detachably connected to the bottom of the reactor column body and a three-phase separator detachably connected to the top of the reactor column body, a reactor column is of a double-layer cavity structure, an inner cavity serves as a reaction area, an outer cavity serves as a constant-temperature water bath area, and the constant-temperature water bath area and the reaction area are independently separated; a water inlet is formed in the bottom cover; the three-phase separator is provided with an exhaust port, a water outlet and a sampling port; a sludge layer, a suspension layer and a settling zone formed by a three-phase separator are sequentially arranged in the reactor from bottom to top, a defoaming device is arranged in the reactor, the defoaming device comprises a scum baffle arranged at a water outlet and is used for intercepting granular sludge with bubbles, pollutants such as COD (chemical oxygen demand), nitrate or nitrate nitrogen and the like in wastewater can be effectively removed, and the sludge treatment efficiency is improved. The centralized treatment requirement of the nitrogen-containing wastewater is met, and the anaerobic biological treatment efficiency of the nitrogen-containing wastewater is effectively improved.

The invention belongs to the field of microorganisms, and particularly relates to a complex microbial inoculant for overcoming continuous cropping obstacles of pinellia ternate and application of the complex microbial inoculant. The active ingredients of the composite bacterial agent are composed of sphingomonas kungheensis JN21 (CGMCC (China General Microbiological Culture Collection Center) No. 36292) and bacillus fruticosa F16 (CGMCC No. 36291), and the active ingredients of the composite bacterial agent are composed of sphingomonas kungheensis JN21 (CGMCC No. 36292) and bacillus fruticosa F16 (CGMCC No. 36291). The two strains can effectively degrade the key continuous cropping autotoxic substance p-hydroxybenzoic acid of pinellia ternate. When the complex microbial inoculant is applied to continuous cropping soil of pinellia ternate, the content of p-hydroxybenzoic acid in the soil is remarkably reduced, the circulation of carbon, nitrogen and sulfur in the soil is promoted, and particularly, the abundance of hydrogen sulfide generation pathway genes is promoted, so that continuous cropping obstacles of pinellia ternate are relieved or prevented. The invention provides an effective microbial solution for solving the continuous cropping obstacle problem of pinellia ternate.

The application relates to the technical field of wastewater treatment, and discloses a wastewater treatment device based on sulfur circulation and a process thereof, which comprises a treatment box, a reduction box and a treatment concentration mechanism; a storage box is fixedly installed at the top of the treatment box; a bottom cover is movably connected to the bottom of the treatment box through a thread structure; when wastewater treatment in the treatment box is completed, the first electric push rod is used to drive the moving plate to move, the thread part on one side of the moving plate is matched with the side wall of the thread rod, the thread rod can drive the movable part to move in the treatment box during rotation, the movable part moves downwards in the treatment box, liquid passes through the screen mesh and flows to the top of the movable part, heavy metal impurities separated in the liquid are isolated at the bottom of the movable part, and finally, the heavy metal impurities are compressed at the bottom of the treatment box, so that the impurities floating in the liquid after treatment are greatly reduced, the separated impurities are easier to be concentrated and treated, and the wastewater treatment efficiency is ensured.

This invention relates to a water nitrate treatment system and method based on dynamic sulfur cycle and fuel cells, comprising: at least one standardized unit, each standardized unit having an SR reactor for stage I reaction and an SRR reactor for stage II reaction connected in series, at least one self-generating MFC module between the SR reactor and the SRR reactor, and an intelligent control unit for operating the various facilities within the standardized unit and for centralized control of multiple standardized units. This invention achieves internal sulfur circulation and efficient nitrate removal through a two-stage dynamic sulfur cycle mechanism, recovers reaction chemical energy through a coupled high-efficiency MFC module, and utilizes the intelligent control unit to achieve adaptive system operation and modular reactor group to provide flexible expansion capabilities.

The invention discloses an integrated biological-chemical crystallization treatment method for efficient denitrification and salt resource recovery of landfill leachate, belongs to the field of landfill leachate treatment and resource recovery and utilization, and particularly relates to an integrated biological-chemical crystallization treatment method for efficient denitrification and salt resource recovery of landfill leachate. The invention aims to solve the problems of high operation cost, low biochemical nitrogen and phosphorus removal efficiency and secondary pollution of concentrated solution in the existing landfill leachate treatment. The method comprises the following steps: 1, front-end sulfur circulation anaerobic ammonia oxidation cooperative treatment; 2, middle-stage deep purification treatment; and 3, tail-end three-stage resourceful treatment. According to the comprehensive solution of integrating a sulfur cycle autotrophic denitrification and anaerobic ammonia oxidation synergistic process, a BAF (Biological Aerated Filter) and ozone-biological activated carbon composite deep purification process and a three-stage recycling system of biological struvite recovery, electrochemical crystallization, freezing and nanofiltration, high-value recovery of resources is realized. The method is used for efficient denitrification and salt resource recovery of the landfill leachate.

This invention discloses a short-cut nitrification-iron coupled sulfur cycle biological denitrification method, belonging to the field of nitrogen-containing wastewater treatment technology. This method utilizes domesticated nitrite-reducing bacteria to convert ammonia nitrogen in wastewater into nitrite; then, a composite bacterial agent obtained by inoculating sulfate-reducing bacteria and denitrifying thiobacilli together in a culture medium containing iron or ferrous ions further removes nitrite and nitrate from the wastewater. Through sulfate reduction and sulfur autotrophic denitrification coupled with iron, sulfate in the wastewater is converted into electron donors, forming a carbon-nitrogen-sulfur-iron biological co-reaction system. This overcomes the shortcomings of single-species denitrification systems, enhances denitrification efficiency, and reduces energy consumption and cost.

This invention provides a method and system for paleoclimate change analysis based on multi-source data fusion, belonging to the field of paleoclimate change analysis technology. This invention collects and standardizes multi-source geochemical indicators related to volcanoes and the sulfur cycle, combining geological methods to achieve time alignment and ensure data consistency and continuity. Based on a Bayesian network, a multivariate causal structure is constructed, with volcanic events set as latent variables and conditional Gaussian distributions used to model observed indicators, uncovering causal relationships and statistical characteristics among multiple indicators, thus solving the problems of data uncertainty and missing data. By dynamically calculating the posterior probability of volcanic events and sulfur cycle anomalies, probability-based objective judgment is achieved, accurately identifying volcano-driven sulfur cycle disturbance events. Furthermore, time matching and correlation analysis are performed using paleoclimate event labels, thereby revealing the mechanism by which volcanic activity affects paleoclimate change.

The invention provides a method for inhibiting production of hydrogen sulfide by anaerobic digestion of excess sludge by using calcium hydroxide. According to the method, calcium hydroxide is used as an external source, and the added green calcium hydroxide inhibits generation of hydrogen sulfide in the sludge digestion process. According to the invention, the generation amount of hydrogen sulfide is obviously reduced. Calcium hydroxide is alkaline hydroxide and can increase the pH value of the sludge, increase the hydrolysis rate of the sludge and remarkably inhibit generation of hydrogen sulfide, meanwhile, Ca < 2 + > generated through hydrolysis is combined with S < 2-> in the solution to form metal sulfide precipitates insoluble in water, and generation of hydrogen sulfide in the sludge digestion process is greatly reduced. Calcium hydroxide pretreatment is a pretreatment method which is economical, feasible and beneficial to the environment, the understanding of the effect of calcium hydroxide in the sulfur circulation of the anaerobic sludge system is deepened, and the application field of calcium hydroxide is expanded.

The present application belongs to the technical field of solid waste reduction and resource utilization, and particularly relates to a high-sulfur coal circulating fluidized bed slag efficient separation calcium-sulfur device and method. The device of the present application comprises a feeding device, a dispersion device, a low-calcium low-sulfur particle screening device, and a medium-calcium medium-sulfur particle air separation device, the medium-calcium medium-sulfur particle air separation device being connected with a first dust removal device; a sample preparation system, the sample preparation system being connected with a rapid calcium-sulfur detector, the low-calcium low-sulfur particle screening device and the medium-calcium medium-sulfur particle air separation device being connected with the rapid calcium-sulfur detector; the medium-calcium medium-sulfur particle air separation device being connected with a medium-calcium medium-sulfur particle screening device, the medium-calcium medium-sulfur particle screening device being connected with a low-calcium low-sulfur discharge port and a medium-calcium medium-sulfur discharge port, respectively, and the low-calcium low-sulfur particle screening device being connected with the low-calcium low-sulfur discharge port. The present application provides a method and a skid-mounted device for efficiently screening and separating calcium-sulfur components of high-sulfur circulating fluidized bed coal-fired boiler slag by combining chemical reaction, airflow field and mechanical separation.