87 results about "Volatile fatty acids" patented technology

The invention discloses a system for producing short-chain volatile fatty acid through kitchen co-fermentation of sludge, and relates to the technical field of biochemical engineering and environmental engineering. Comprising a time phase construction module, a causal playback identification module, a flow field mapping correction module, a metabolism gating feedback module, a structure reconstruction steady-state module and a phase traction control module, and reconstructing a gas-liquid phase difference reference surface according to the real-time flow field response, and establishing a reference surface to calibrate an anti-phase trigger window. According to the method, gas-liquid reverse-phase accurate identification is realized through a high-precision time base line and flow field tracking, a causal chain is constructed to early warn an inverted nucleation area in advance, a steady-state energy base plane is established in combination with three-dimensional flow field correction and metabolism monitoring feedback and driving structure cooperative adjustment, and finally disturbance suppression and path self-resetting are realized through phase traction regulation. The acid production efficiency and the system stability are improved.

The application provides a pediococcus acidilactici M4 for low-moisture fermented feed and an application thereof, and belongs to the field of microbial application and feed technology. The application uses the pediococcus acidilactici M4 to prepare fermented total mixed ration. The bacteria have the characteristics of high osmosis and fast acid production, and can reduce the pH value of the fermentation system in a short time; have strong broad-spectrum bacteriostatic effect on escherichia coli, chicken white dysentery salmonella and staphylococcus aureus; and perfectly adapt to the fermentation of low-moisture total mixed ration. The strain is used as the fermentation strain of low-moisture total mixed ration, can significantly reduce the content of acid detergent fiber and neutral detergent fiber, improve the crude protein level, and then improve the digestibility of the daily ration, increase the content of probiotics such as lactic acid bacteria and yeast in the daily ration, reduce the content of pathogenic bacteria such as escherichia coli in the daily ration, and also can improve the content of volatile fatty acid in the daily ration, improve the quality of the daily ration, and improve the feeding value of the daily ration.

The application belongs to the field of environmental microbiology, and particularly relates to a Comamonas testosteroni G314 and application thereof.The technical points are as follows: the Comamonas testosteroni provided by the application is preserved in the China General Microbiological Culture Collection Center of the Institute of Microbiology, Chinese Academy of Sciences, No. 1, Xibahe Road, Chaoyang District, Beijing, China, and the preservation number is CGMCC No. 32129, and the preservation time is September 30, 2024.The Comamonas testosteroni provided by the application has different abilities to synthesize PHA by using different organic acid carbon sources, and the type of PHA can be regulated by regulating the composition of volatile fatty acids, so that the performance of PHA is improved, new strains for efficient production of PHA are provided, and the production cost of PHA is significantly reduced.

The invention discloses a binary pseudocapacitance composite material for promoting anaerobic digestion of kitchen waste and a preparation method and application thereof, and belongs to the technical field of organic solid waste recycling and renewable energy sources. The wood chip biochar-polydopamine-Fe3O4 composite material with a core-shell structure is constructed by taking wood chips as raw materials, preparing biochar through low-temperature pyrolysis, forming an interface modification layer through polydopamine coating, loading Fe < 3 + > and carrying out secondary pyrolysis to generate Fe3O4 nanoparticles (40-110nm). The material can be recovered through a magnetic field (the recovery rate is greater than or equal to 90%), when the dosage is 0.8-1.2 g / L, the peak value of volatile fatty acid in an anaerobic digestion system is obviously reduced to be less than or equal to 400 mg / L, the methane accumulation yield is improved to be greater than or equal to 45%, the electron transfer efficiency of acid-producing bacteria and methanogens is synchronously optimized, and the system operation is stabilized.

The invention belongs to the technical field of organic waste treatment, and particularly relates to a multi-parameter regulation and control high-cellulose organic waste anaerobic digestion treatment method. According to the method provided by the invention, high-cellulose wastes such as traditional Chinese medicine residues, olive residues and vinasse are subjected to alkali liquor, hydrothermal or biogas slurry pretreatment, the contents of reducing sugar, volatile fatty acid (mainly acetic acid) and ammonia nitrogen are synchronously monitored, and the pretreatment conditions are dynamically adjusted according to preset thresholds (the reducing sugar is less than or equal to 50mg / g, the acetic acid is obviously higher than propionic acid, and the ammonia nitrogen is less than or equal to 7mg / g). The method disclosed by the invention realizes cooperative regulation and control of hydrolysis promotion and digestion stability, effectively avoids acidification and ammonia inhibition, improves the methane yield and the system operation stability, and is suitable for efficient anaerobic digestion treatment of various high-cellulose organic wastes.

The invention provides a method for highly converting algae organic solid waste into a biological carbon source. According to the method disclosed by the invention, the algae organic solid waste is directly treated by using an electrochemical means under the condition of not additionally adding an agent, so that the biodegradability of the algae organic solid waste is improved, the efficient resource utilization of the algae organic solid waste is further improved, the cost is reduced, and the risk of generating by-products due to additionally adding the agent is reduced; the electrochemical means has the characteristics of high efficiency, good universality, high cleanliness, environmental friendliness and the like, can remove algae in the water body without generating toxic and harmful by-products, can ensure the safety of the water body and the natural ecological safety of the subsequent water body, and also avoids the use of other additional medicaments; the yield of the volatile fatty acid generated in the fermentation process of the pretreated substrate is remarkably increased, reaches 5541 mg / L to the maximum, and is increased by 19% compared with the volatile fatty acid generated after enrichment of single algae.

The invention discloses an intelligent adjusting tank system for carbon source recovery, and relates to the technical field of sewage treatment, the intelligent adjusting tank system comprises an intelligent homogeneous adjusting tank, the intelligent homogeneous adjusting tank comprises an adjusting tank body, and the inner side of the middle part of the adjusting tank body is connected with the bottom end of a diversion annular sleeve; the device further comprises an adjusting tank water distribution mechanism, a homogeneous stirring mechanism, a hydrolytic acidification-membrane separation coupling tank and an intelligent dosing unit, wherein the adjusting tank water distribution mechanism is mounted in the middle of the arc-shaped tank bottom; the homogeneous stirring mechanism is mounted in the middle of the regulating tank body; according to the intelligent adjusting tank system for recycling the carbon source, the quality of inflow water is monitored and pre-adjusted in real time through the intelligent homogeneous adjusting tank, the buffering capacity on inflow water impact load is high, it is ensured that wastewater entering the hydrolytic acidification cavity is in the optimal reaction condition, volatile fatty acid is enriched and recycled through the membrane separation effect, and the yield is high. The recovered carbon source can be directly used for a subsequent biological nitrogen and phosphorus removal process, so that the problem of insufficient carbon source during nitrogen and phosphorus removal of industrial wastewater with low carbon nitrogen ratio is effectively solved.

The invention discloses a method for producing volatile fatty acid by improving microbial electro-catalytic conversion of CO2. The core of the method is to construct an efficient and stable heterozygote biological cathode. The method comprises the following steps: inoculating flora mainly comprising Acetobacter burgii and Desulfurization Vibrio in a cathode chamber of an H-type microbial electrosynthesis reactor, and adding a zinc source and a sulfur source to synthesize ZnS nanoparticles in situ on the surfaces of cells, so as to construct the bacterium and ZnS nanoparticle heterozygote biological cathode. The acetic acid yield of the heterozygote biological cathode can reach 3.38 mmol / L / d, and the accumulative yield of one batch is 20.25 mmol / L, which is 2.7 times that of an unmodified carbon cloth biological cathode; the coulombic efficiency of the total volatile fatty acid product reaches 96.47% and is 1.25 times that of a carbon cloth biological cathode; and the coulombic efficiency of acetic acid and the selectivity of acetic acid are respectively improved to 83.27% and 86.32%, which are obviously higher than 40.63% and 52.64% of those of a carbon cloth biological cathode. In addition, the charge transfer resistance of the heterozygote biological cathode is as low as 3.75 ohm and is obviously superior to that of a carbon cloth biological cathode (25.28 ohm), so that long-term stable and high-selectivity acetic acid production is realized.

The invention relates to a high-efficiency nitrogen removal method based on coupling of anaerobic hydrogen production and hydrogen type autotrophic denitrification, which comprises the following steps: S1, using high-concentration organic wastewater with the COD (Chemical Oxygen Demand) concentration of more than or equal to 5000mg / L, carrying out mechanical crushing and homogenization treatment to ensure that the particle size of particles is less than or equal to 1mm, and carrying out ultrasonic treatment to enhance the dissolution of organic matters; s2, firstly inoculating acid-producing bacteria into the wastewater, and carrying out continuous stirring fermentation at 34-38 DEG C, so that the acid-producing bacteria convert complex organic matters into volatile fatty acid (VFA), and the concentration of the VFA reaches 2000-3000mg / L; adjusting the pH value to 5.5-6.5, inoculating hydrogenogens, and fermenting to produce hydrogen; s3, absorbing tail gas generated in the fermentation process with alkali liquor to obtain purified hydrogen, and collecting the purified hydrogen; and S4, loading a filler in an up-flow packed bed reactor, inoculating hydrogen autotrophic denitrifying bacteria, injecting hydrogen into the reactor through a hollow fiber membrane gas distribution device, enabling the bubble diameter to be less than or equal to 50 microns, controlling the water temperature to be 30-35 DEG C, and controlling the HRT to be 4-12 hours. Hydrogen is obtained through fermentation of organic waste and used for a denitrification system, the hydrogen utilization rate is increased, energy consumption is reduced, and the green circulation target of treating waste with waste is achieved.

The invention discloses a method for promoting rapid recovery of a mixed fermentation system based on a complex microbial inoculant and cow dung. The method comprises the following steps: firstly, treating a mixed material of chicken manure and straw pulping waste liquid; then, when the methane production rate of the mixed fermentation system is reduced by more than 10% or the hydrogen sulfide content is higher than 100ppm, starting a recovery program; the method comprises the following steps: firstly, mixing a complex microbial inoculant into feed fed into an integrated device, then, feeding pretreated cow dung into a fermentation methane production area of the integrated device, and continuously monitoring the gas production rate, methane content, hydrogen sulfide content and volatile fatty acid concentration of a system. Meanwhile, pretreated cow dung is added into a fermentation methane production area of the integrated device so as to supplement methane bacteria, and two-phase anaerobic process parameter optimization is combined, so that rapid and stable recovery of the system is realized.

This invention relates to the field of waste sludge treatment technology, specifically to an in-situ resource utilization method for a microbial-algae system and its application. The in-situ resource utilization method for the microbial-algae system includes: placing waste sludge, microalgae, and sodium sulfite in an anaerobic fermentation reactor, then adjusting the pH of the mixture and fermenting under anaerobic conditions; wherein the microalgae include at least one of the phyla of green algae, cyanobacteria, and diatoms; and no anaerobic sludge is added to the anaerobic fermentation reactor. This method can effectively utilize the microbial-algae system to increase the yield of volatile fatty acids during anaerobic fermentation in situ, and can also reduce the yield of waste sludge in situ, thereby lowering the subsequent disposal costs of sludge and microalgae in the secondary sedimentation tank.

The invention provides a compound bacteria preparation for sludge treatment and a preparation method of the compound bacteria preparation. The preparation method comprises the following steps: S1, preparing stearamide propyl phosphate betaine-PVA microgel; s2, preparing stearamide propyl phosphate betaine-PVA (Polyvinyl Alcohol) microgel / SiO2 composite microspheres; s3, carrying out high-temperature carbonization on the stearamide propyl phosphate betaine-PVA microgel / SiO2 composite microspheres under the protection of inert gas, so as to obtain C / SiO2 composite microspheres; and S4, adding the C / SiO2 composite microspheres into the mixed bacterial liquid, introducing nitrogen, heating and stirring to obtain the composite bacterial preparation for sludge treatment. According to the method, sphybrid conjugate electrons of a porous carbon matrix are prepared, distribution of electron clouds of refractory organics in the sludge is adjusted through interface action, active sites are exposed, degradation activation energy is reduced, decomposition of the refractory organics into volatile fatty acid is accelerated, and microspheres of a porous structure can also reduce mass transfer obstruction caused by thallus aggregation, so that the degradation efficiency of the sludge is improved. The sludge treatment is facilitated.

The application provides a method and a treatment device for realizing consumption reduction and emission reduction by optimizing carbon source circulation in a sewage plant, and the treatment method comprises the following steps: mixing residual sludge with biological surfactant, stirring and treating, and then performing low-temperature thermal hydrolysis treatment, and then performing stripping and separation of extracellular polymers through hydraulic cyclone; wherein the residual sludge is a mixture of biochemical sludge and physical-chemical sludge, and the temperature of the low-temperature thermal hydrolysis is not more than 90 DEG C; performing short-path fermentation on the treated sludge to obtain carbon source rich in volatile fatty acids; recycling sludge conversion carbon source; and putting the recycled carbon source into a biochemical denitrification treatment device to supplement biological denitrification carbon source. By adopting the technical scheme of the application, the extracellular polymers of the residual sludge can be converted into volatile fatty acids as the main fermentation substrate, and the volatile fatty acids can be used for in-situ denitrification, so that the carbon source in the sewage plant can be recycled, the sludge amount can be reduced, the cost can be saved, and the carbon emission can be reduced.

The invention provides a method for improving the anaerobic fermentation acid production effect of oxytetracycline-containing sludge by using thiosulfate pretreatment, which comprises the following steps: adding anaerobic sludge of a sewage plant into a fermentation tank as inoculated sludge, adding oxytetracycline and thiosulfate, then blowing nitrogen to drive oxygen, sealing the fermentation tank to degrade oxytetracycline through constant-temperature anaerobic fermentation, and carrying out centrifugal separation to obtain the oxytetracycline-containing sludge. The supernatant is fermentation liquor rich in volatile fatty acid; wherein the total suspended solid concentration of the inoculated sludge is 20-27 g / L, the mass concentration of the thiosulfate in the sludge is 900 mgS / L in terms of S, and the adding concentration of the oxytetracycline is 5-25 mg / L. According to the method, sludge hydrolysis is promoted, a microbial community structure is adjusted and electron transfer is accelerated by utilizing the reducibility of thiosulfate, so that the conversion rate of organic matters to VFA is increased, oxytetracycline is synchronously and efficiently removed, and a new solution is provided for antibiotic pollution control and sludge resource utilization.

The present application belongs to the technical field of corn stalk resource utilization, and particularly relates to a method and device for directional regulation of anaerobic continuous production of volatile fatty acids from corn stalks. The method comprises the following steps: mixing corn stalks with inoculum in a reactor, adjusting the initial pH to 4.0-10.0, and then performing a continuous hydrolysis and acid production reaction, with corn stalks being added to the reactor at regular intervals every day; in the continuous hydrolysis and acid production reaction, the pH of the reaction system is controlled at 4.0-10.0, and intermittent micro-aeration is performed, with the aeration frequency being once per day after feeding, and the aeration amount being 60-100 mL / L per aeration. The method can achieve efficient directional hydrolysis and acid production from corn stalks, and the total volatile fatty acid concentration and the proportion of acetic acid or butyric acid concentration are both significantly improved.

The invention discloses a biogas anaerobic fermentation dynamic control system based on multi-parameter self-adaption, and belongs to the technical field of biogas production. A traditional biogas fermentation system is designed for fixed raw materials, volatile fatty acid accumulation, pH imbalance and gas production efficiency fluctuation are easily caused when the raw materials change, and control lag is serious. The system comprises an anaerobic reaction device, a self-adaptive control strategy module, process parameter state detection and load decoupling regulation. The adaptive control strategy module adaptively adjusts parameters through a prediction optimization algorithm to ensure stable operation of the system under different conditions; process parameter state detection monitors environmental parameter coupling influence in real time; a decoupling algorithm is established for load decoupling regulation and control, and the fermentation efficiency is prevented from being reduced due to parameter conflicts.

The invention discloses an optimized design method of an activated sludge nitrogen and phosphorus removal process, and belongs to the technical field of sewage treatment. Aiming at the problems of low carbon source utilization efficiency, insufficient denitrification capacity and the like in the urban sewage with the low carbon nitrogen ratio, the method comprises the following steps of: subdividing COD (Chemical Oxygen Demand) of inlet water into five components, namely volatile fatty acid, dissolved-state biodegradable organic matters, granular-state biodegradable organic matters, dissolved-state inert organic matters and granular-state inert organic matters; the volume ratio of the anaerobic tank to the anoxic tank is dynamically optimized by adopting iterative computation, the competitive utilization of phosphorus-accumulating bacteria and denitrifying bacteria on a carbon source is balanced, and the collaborative matching of the denitrification capacity and the nitrification capacity is realized. The method can obviously improve the utilization efficiency of the carbon source, reduce the addition of an external carbon source, reduce the operation cost and improve the nitrogen and phosphorus removal effect, and is suitable for process design and optimized operation of a sewage treatment plant.

The application discloses a method for inhibiting sulfate-reducing bacteria (SRB) in a salt cave hydrogen storage project, and belongs to the technical field of hydrogen energy storage. The method uses salt-tolerant hydrogen-producing microorganisms to perform anaerobic fermentation on the inner wall of the salt cave by using a glycerol-polyacrylamide-glycerol ring layer, so that hydrogen and volatile acid metabolites are generated, and the sulfate-reducing bacteria are inhibited. The volatile fatty acids have a significant inhibitory effect on the SRB in a high-salt environment. The application provides an efficient and environmentally-friendly SRB inhibition method in the salt cave hydrogen storage project, thereby reducing the generation of harmful gas hydrogen sulfide in the salt cave and effectively reducing the corrosion risk of hydrogen sulfide.

The application discloses acetic acid-producing proteobacteria and application thereof in preparation of feed additives. 35 strains with good fiber degradation function are obtained from Holstein cow rumen fluid through preliminary screening, and bran medium is used for screening the 35 strains, and it is found that 25 strains have the ability of converting complex carbon source into reducing sugar, and the most powerful strains of different genera are selected for in-vitro fermentation verification, and the fiber utilization efficiency of the strains on ruminant TMR is observed, and it is found that the acetic acid-producing proteobacteria (microbial preservation number is CGMCC No. 33516) has the most powerful function on feed dry matter degradation rate and fiber degradation rate, and can improve rumen fermentation liquid pH value, and significantly improve the content of acetic acid, isobutyric acid, butyric acid, valeric acid and total rumen volatile fatty acid. The acetic acid-producing proteobacteria provided by the application has application prospect in improving feed fiber utilization rate or improving animal digestion capacity.

The invention discloses a landfill leachate multistage recycling method, which belongs to the technical field of landfill leachate treatment and recycling, and comprises the following steps: hydrolytic acidification and volatile fatty acid (VFA) extraction; humus is concentrated; separating humus; and separating salt from the concentrated solution. Through the mode, the easily-decomposed organic matter is converted into volatile fatty acid, then the volatile fatty acid, humus, ammonia salt, other various salts and recycled water are obtained through the modes of concentration, separation and the like, separation and output of the easily-decomposed organic matter, the difficultly-decomposed organic matter, ammonia, salts and water in the landfill leachate are achieved, and the landfill leachate can be used as an industrial product; the treatment of the leachate is realized, and meanwhile, the recycling of the leachate is realized.

The invention belongs to the technical field of sewage sludge treatment and recycling, and provides a method and a device for producing a high-quality carbon source for short-cut denitrification by directional regulation and fermentation of sludge. The method comprises the following steps: (1) adding sludge with the solid content of 2-5% into a reaction tank of a device for producing short-cut denitrification by directional regulation and control of sludge fermentation, sealing the reaction tank, and aerating the sludge in the reaction tank under a stirring condition to realize directional fermentation; the aeration flow is controlled to be 6-120 L / (kg VSS.h), the gas introduced by aeration is air, and the pressure intensity of the reaction tank is controlled to be normal pressure; and (2) carrying out solid-liquid separation on the fermentation liquor obtained after directional fermentation in the step (1) to obtain a liquid phase which is the high-quality carbon source for short-cut denitrification and contains volatile fatty acid with acetic acid as a main component. According to the method, directional acetic acid production through sludge fermentation can be realized on the basis of not additionally adding medicaments, the medicament cost is reduced, the process operation is simplified, and the yield of volatile fatty acid and the acetic acid proportion during sludge fermentation are improved.

The invention relates to the technical field of livestock breeding monitoring, and particularly discloses a sheep rumen health environment monitoring device and system. The device comprises a swallowable monitoring capsule, a multi-parameter sensing module integrated with biochemical, electrochemical biological and physical quantity sensing units is arranged in the monitoring capsule, and the monitoring capsule is used for synchronously collecting hydrogen ion concentration, volatile fatty acid concentration, ammonia nitrogen concentration, microbial metabolism electric signals, temperature and pressure data of rumen fluid in situ and transmitting the data through a wireless communication module. The system further comprises a data gateway and a remote server platform. A health analysis model operated by a server platform can carry out deep processing on the multi-source time sequence data, and early judgment of the sub-clinical rumen acidosis risk and quantitative evaluation of the feeding efficiency are achieved by executing a specific multi-condition linkage early warning algorithm and a metabolic balance evaluation algorithm. According to the invention, the defects of one-sided monitoring parameters and insufficient data utilization in the prior art are overcome, and a more comprehensive and intelligent rumen health management solution is provided.

The application discloses cupriavidus capable of producing polyhydroxyalkanoate by using various carbon sources such as ethanol and application thereof. Cupriavidus The strain sp.ZWJ01 has a preservation number of CGMCC No.37462 in the China General Microbiological Culture Collection Center. The strain can grow and accumulate poly-3-hydroxybutyric acid ester by using various substances such as ethanol, volatile fatty acid and sugar as carbon sources; can grow by using mixed carbon sources of ethanol+propionic acid or ethanol+valeric acid and accumulate poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid ester) in cells; and can grow by using mixed carbon sources of ethanol+gamma-butyrolactone or ethanol+1,4-butanediol and accumulate poly(3-hydroxybutyric acid-co-4-hydroxybutyric acid) in cells, and has a good application prospect.

The invention discloses a method for promoting anaerobic fermentation of excess sludge to produce acid, and belongs to the technical field of sludge treatment and recycling. The method comprises the following steps: preparing excess sludge into a sludge suspension; adding a percarbonate adhesive and carrying out ultrasonic synergistic treatment; and mixing with inoculated sludge, and fermenting to produce acid under an anaerobic condition. The ultrasonic cavitation effect is utilized to promote decomposition of percarbonate to generate hydroxyl free radicals and free ammonia, sludge flocs and cell structures are synergistically destroyed, the dissolution and hydrolysis efficiency of organic matters is greatly improved, and abundant substrates are provided for acid-producing bacteria, so that the yield of volatile fatty acid is remarkably increased. The method has the advantages of strong synergistic effect, high treatment efficiency, less agent dosage, low cost, mild operation conditions, environmental friendliness and the like, and is suitable for efficient resourceful treatment of the excess sludge.

The present application relates to an electrochemical system and method for capturing carbon dioxide, regenerating pure carbon dioxide, and / or converting captured carbon dioxide to biomethane, syngas, formic acid, and combinations thereof. More specifically, the present application relates to an electrochemical cell having an air cathode-proton or cation exchange membrane and a non-biological or biological anode in which captured carbon dioxide is reduced to carbonate, which is then regenerated to pure carbon dioxide or transferred to another chemical production module. The regenerated carbon dioxide may be purified, compressed, or stored for later use. The present application includes volatile fatty acids derived from carbohydrate-rich waste. The present application also includes the ability to regenerate caustic absorbers used in initial carbon dioxide capture.

The invention belongs to the technical field of sludge anaerobic digestion, and particularly relates to a microbial primary battery coupling system based on anaerobic digestion and a treatment method. On the basis of an anaerobic digestion and microbial primary battery coupling system, the negative influence of volatile fatty acid accumulation in an anaerobic digestion system is relieved by utilizing the catalytic action of microorganisms, the extracellular electron transfer capacity of methanogens is improved, the system stability is improved, and methane production is promoted. According to the method, the anaerobic digestion performance of the system is improved, biological electric energy can be recycled, sludge generation is reduced, and the method has the advantages of being convenient to operate and maintain, low in cost and the like and has great advantages compared with a traditional anaerobic digestion system.

The invention discloses an advanced oxidation treatment device and treatment method for printing and dyeing wastewater, and relates to the technical field of sewage treatment.The device comprises a closed reactor, a feeding port is formed in the bottom of the closed reactor, and a discharging port and an exhaust port are formed in the top of the closed reactor; a functional filler layer is arranged in the closed reactor; activating balls and persulfate are arranged in the functional filler layer, the activating balls are formed by soaking Fe3O4 nano-particles and wine brewing wastewater fermentation liquor, and volatile fatty acid adsorbed on the surfaces of the activating balls is at pH gt; when the temperature is 7.5, the persulfate is desorbed and activated to generate sulfate free radicals. According to the invention, an autocatalysis system composed of pH responsive activation balls and persulfate is constructed in the functional filler layer, so that sulfate free radicals can be generated without adding an external agent, and meanwhile, the purpose of reducing carbon emission by inhibiting the activity of methanogens through metabolic competition is achieved.

The application discloses a kind of low carbon-nitrogen ratio sewage plant carbon source excavation and preparation method, it is related to sewage treatment field, carbon source in sewage plant is obtained by anaerobic acid production fermentation of primary sludge, rich in volatile fatty acid, effectively improve the denitrification and phosphorus removal efficiency of sewage treatment process.The application recycles organic matter in primary sludge while improving the carbon-nitrogen ratio of sewage influent, reducing the cost of additional carbon source, and also alleviating the problem of primary sludge disposal.The settling performance of the pretreated primary sludge is better, and it is easy to dewater and treat.The fermentation period is short, and the carbon source in the primary sludge can be obtained faster.Under the condition that the carbon-nitrogen ratio of the influent is supplemented to the same proportion, the denitrification and phosphorus removal effect of the carbon source is better, and it is suitable for denitrification and phosphorus removal treatment of low carbon-nitrogen ratio sewage.

The invention belongs to the technical field of nutrition regulators for ruminants, and particularly relates to application of indole-3-acetic acid (IAA) in preparation of a feed additive and a ruminant feed. Therefore, the invention provides the application of the indole-3-acetic acid in preparation of the feed additive and the ruminant feed.

The invention discloses a method for realizing stable methane production by regulating and controlling anaerobic fermentation metabolic pathways of cellulose biomass by comparing iron-based materials, and belongs to the technical field of anaerobic digestion of agricultural wastes. According to the method, a 250 mL high borosilicate glass anaerobic bottle is used as a parallel reactor, medium-temperature batch fermentation is carried out at 37 DEG C, microcrystalline cellulose simulated straw is used as a substrate, and an operation cycle of replacing 70% of a culture medium every 10 days is set. The method is characterized in that a comparison system comprising at least three groups of parallel systems is constructed, zero-valent iron is added into one group, carbon-coated zero-valent iron is added into the other group, the addition amount is 0.5 g / L, and a blank control group is set. The gas production performance, the volatile fatty acid accumulation kinetics, the iron ion dissolution kinetics and the microbial community structure of the three systems are synchronously monitored, compared and analyzed, and the differential regulation and control mechanism of the two materials on the microbial metabolic pathway is defined.