147 results about "Biogas production" patented technology

An improved method and apparatus for removing acid gases and other impurities from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, is disclosed. The method provides efficient generation of high-purity renewable natural gas from raw biogas. The biogas is treated in a multi-stage membrane system integrated with compression equipment. The membrane separation units are arranged into interconnected high-pressure and low-pressure gas recycling loops powered by high-pressure and low-pressure compressors. The multi-stage membrane system can be integrated with deoxygenation and auxiliary nitrogen removal systems. The combined system provides for the generation of efficient contaminant removal from raw biogas to generate high-purity methane products with reduced compression energy consumption.

An improved method and apparatus for removing acid gases and other impurities from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, is disclosed. The method provides efficient generation of high-purity renewable natural gas from raw biogas. The biogas is treated in a multi-stage membrane system integrated with compression equipment. The membrane separation stages are integrated with high-pressure and low-pressure compressors with the low-pressure compressor operating in a defined pressure range. The combined system provides for efficient contaminant removal from raw biogas to generate high-purity methane products with reduced membrane area and compression energy consumption.

The invention relates to the technical field of organic solid waste treatment, in particular to a process system for hydrogen production and co-production of biological natural gas from biological crude synthesis gas, which comprises a purification unit, a hydrocarbon regulation unit, an acid removal unit, a methane upgrading unit, a hydrogen recycling and purifying unit and a methane recycling and purifying unit which are connected in sequence. The purification unit is used for removing impurities through pre-impurity removal, compression, dry-process impurity removal and wet-process desulfurization to produce purified synthesis gas and sulfur; the hydrocarbon adjusting unit is pressurized through a centrifugal compressor and adjusts the hydrogen-carbon ratio; the acid removal unit is used for removing acid gas and organic sulfur; the methane upgrading unit is used for converting CO / CO2 into methane through methanation reaction; and the recycling unit purifies hydrogen through pressure swing adsorption and recycles methane by using a membrane separation technology to produce biogas. The problems of low purity and insufficient raw material utilization rate of the traditional process are solved through the circulation process, the co-production of high-purity hydrogen and biogas is realized, and the additional value of resources is improved.

The invention belongs to the technical field of feces treatment, particularly relates to integrated rural toilet feces deep separation treatment equipment, and aims to solve the problems that existing equipment is poor in operation stability and not ideal in total phosphorus and ammonia nitrogen pollutant removal rate, the integrated rural toilet feces deep separation treatment equipment comprises a solid-liquid separation module, an anaerobic treatment tank, an aerobic treatment tank and a liquid-phase flocculation unit, a solid phase and a liquid phase of feces are separated through the solid-liquid separation module, the liquid phase is flocculated through the liquid phase flocculation unit, the liquid phase and the solid phase are put into corresponding fermentation areas of the anaerobic treatment tank to be subjected to anaerobic fermentation treatment, the liquid phase is conveyed to the aerobic treatment tank to be subjected to further aerobic treatment, and the liquid phase and the aerobic treatment tank are subjected to anaerobic fermentation treatment. The integrated treatment of solid-liquid separation, anaerobic biogas production and aerobic denitrification of rural toilet feces is realized, the solid phase and the liquid phase after the integrated treatment can be respectively subjected to further resource utilization, and the system is extremely suitable for being used in rural areas.

The invention discloses an advanced organic wastewater treatment method and treatment device based on an advanced oxidation coupling coagulation denitrification method, and relates to the technical field of landfill leachate treatment, kitchen waste treatment, kitchen garbage treatment and the like, the treatment device comprises a coagulation tank unit, a flocculation tank unit, an air floatation and filter tank unit, an ozone catalysis unit and an activated carbon filter unit which are connected in sequence, the ozone generation unit and the tail gas decomposition unit are connected with the ozone catalysis unit. According to the invention, a traditional nanofiltration membrane advanced treatment process in the industry is replaced by an advanced treatment process of coagulation, flocculation, air floatation, filtration, ozone catalysis and activated carbon filtration, so that the generation of a concentrated solution is avoided; the defect that the biogas yield of an anaerobic digestion system is reduced due to the fact that the sulfate-containing concentrated solution flows back to the anaerobic digestion system of the landfill leachate treatment plant or the kitchen waste treatment plant is overcome, the load of a biogas desulfurization system of the landfill leachate treatment plant and the kitchen waste treatment plant is reduced, and the consumption cost of the concentrated solution is greatly reduced.

The invention discloses an integrated anaerobic fermentation self-heating biogas production system and method, and belongs to the technical field of biomass energy. In the system disclosed by the invention, a thermal medium outlet of a solar heat collection unit is connected with a thermal medium inlet of a heat storage unit; a heat medium outlet of the heat storage unit is connected with a heat medium inlet of the anaerobic fermentation unit; a gas outlet of the anaerobic fermentation unit is respectively connected with the post-treatment system and the torch incineration device; a natural gas outlet of the post-treatment system is connected with the torch incineration device; a waste heat outlet of the post-treatment system is connected with a thermal medium inlet of the anaerobic fermentation unit; a cold medium outlet of the anaerobic fermentation unit is connected with a cold medium inlet of the heat storage unit; and a cold medium outlet of the heat storage unit is connected with a cold medium inlet of the solar heat collection unit. The system solves the technical problem that an existing method is high in energy consumption and difficult to achieve efficient operation of the whole system.

The invention discloses a carbon-based electrode-microorganism self-assembled compound, a preparation method thereof and application of the carbon-based electrode-microorganism self-assembled compound in strengthening anaerobic fermentation of agricultural wastes. The compound is formed by self-assembly of direct interspecific electron transfer (DITE) functional microorganisms (anode reduction geobacter and methanobacterium flexural) on the surface of a high-conductivity carbon-based electrode under the induction of a micro electric field, the relative abundance of the anode reduction geobacter is 65-82%, and the relative abundance of the methanobacterium flexural is 18-35%. During preparation, the carbon-based electrode is cleaned by acetone, ethanol and water, then the carbon-based electrode, a reference electrode and a counter electrode form a three-electrode system, and the three-electrode system is induced for 3-5 days in a micro electric field of-0.2-0.2 V to form a compound. 1-5 g / L of the compound is added into a straw-excrement mixed substrate (25-40 g VS / L) subjected to alkali pretreatment, anaerobic fermentation is conducted for 50 d after biogas slurry is inoculated, the pH can be stably maintained at 7.2-8.0, the accumulated biogas yield reaches up to 450-630 mL / g VS, and the volume fraction of methane is 68-82%. The process is simple, the compound is high and stable in activity, and efficient resource utilization of agricultural waste can be achieved.

The invention is suitable for the field of digital control, and discloses an energy recovery method and system for agricultural non-point source pollution treatment and a storage medium. The energy recovery method for agricultural non-point source pollution treatment comprises the steps that if to-be-treated pollutants are detected, component information of the to-be-treated pollutants is detected, the component information comprises the carbon nitrogen ratio, the water content and the organic matter content, and the to-be-treated pollutants comprise at least one of livestock and poultry breeding waste, crop straw, rural domestic sewage and agricultural production wastewater; according to the component information, a target energy conversion process is selected, and the target energy conversion process comprises at least one of an anaerobic fermentation biogas preparation process, a biomass pyrolysis fuel gas production process, a sewage anaerobic electricity production process and a straw solidification heat production process; according to the target energy conversion process, the recovered energy is output, collected and stored, and the energy comprises at least one of methane, combustible mixed gas, electric energy and heat energy. The conversion efficiency of energy recovery is improved.

The invention discloses a control method of a wine brewing wastewater anaerobic reactor, belongs to the technical field of wastewater biological treatment, and mainly solves the problems of inaccurate judgment of an operation stage and single control strategy in the prior art. According to the method, parameters such as a pH value, COD (Chemical Oxygen Demand), VFA (Volatile Fatty Acid) concentration, biogas yield and ATP (Adenosine Triphosphate) content are monitored in real time, and an operation process is divided into three stages, namely a starting stage, a steady-state stage and an abnormal recovery stage. The load increasing rate and the pH range are controlled in the starting period; in the steady-state period, the water inlet flow is adjusted through a PID algorithm to maintain stable operation; and measures of reducing flow, increasing stirring, adding an alkaline agent and the like are taken in an abnormal recovery period. Through multi-parameter collaborative judgment and differential control strategies, accurate recognition and dynamic adjustment of the operation stage are achieved, the stability and the treatment efficiency of the treatment system are remarkably improved, and the method is suitable for anaerobic biological treatment of various kinds of wine brewing wastewater.

The utility model provides a membrane filtration decarburization device for biogas production, which relates to the technical field of biogas production and comprises a reaction mechanism and a main body mechanism, the reaction mechanism comprises an oxidation tank, a cover plate is clamped at the top of the oxidation tank, a stirring shaft is inserted into the cover plate in a penetrating manner, a stirring paddle fixedly sleeves the outer surface wall of the stirring shaft, an agent inlet pipe, an oxygen inlet pipe and an air inlet pipe are fixedly communicated with the top of the cover plate, and a motor is fixedly mounted at the top of the cover plate. And the output end of the motor is fixedly connected with the top end of the stirring shaft. According to the device disclosed by the utility model, a catalyst is poured into the oxidation tank from the catalyst inlet pipe, biogas is introduced by utilizing the gas inlet pipe, oxygen is introduced by utilizing the oxygen inlet pipe, and the stirring paddle is driven to rotate by utilizing the motor, so that the catalytic oxidation efficiency is conveniently improved, hydrogen sulfide and volatile organic compounds in the biogas are removed, and metal parts in the device are prevented from being corroded; the separation performance of the membrane is influenced.

An anaerobic digestion process monitoring system can accurately predict the amount of biogas produced even when the activity of anaerobic microorganisms in a digester fluctuates. The system comprises: a first sensor (4) for measuring the amount of organic waste fed into a digester (2) and outputting load data as a measurement result; a second sensor (5) for measuring the properties of a fermentation liquid inside the digester (2) and outputting fermentation liquid property data as a measurement result; a preprocessing unit (12) for calculating estimated activity index data indicating the activity of anaerobic microorganisms based on the load data and the fermentation liquid property data using a first estimation model; and a gas production prediction unit (13) for calculating a predicted value of biogas production based on the load data, the fermentation liquid property data, and the estimated activity index data using a second estimation model.

The present invention discloses a design method and operation strategy for a biogas fermentation system based on gas production performance prediction, and relates to the technical field of biogas power systems. The design method for a biogas fermentation system based on gas production performance prediction disclosed by the present invention includes the construction of a gas production performance prediction model, which is based on the coupling of a biogas heat transfer model and a biogas production model, and measures the device performance parameters of the biogas production system and outdoor environmental parameters to construct a biogas heat transfer model. At the same time, it combines the system operation plan to construct a biogas fermentation gas production model; the operation strategy includes the control of insulation, the control of feed, etc. The present invention proposes a design method and operation strategy based on gas production performance prediction, and rationally designs the scale of the biogas system based on the gas production performance prediction model to achieve the goal of reducing costs. By rationally controlling insulation, feed, and gas storage tanks, the purpose of stable gas supply can be achieved under adverse conditions.

The utility model discloses a biogas digester stirring device, relates to the technical field of biogas digester stirring, and aims to solve the problems that a biogas slurry condensation shell generated at the upper part cannot be fully scattered and biogas residues at the bottom are precipitated due to the fact that the existing biogas digester stirring device cannot fully stir biogas slurry and is easy to stratify during stirring. According to the technical scheme, the stirring tank comprises a stirring tank body, one side of the stirring tank body is connected with a feeding pipe, the other side of the stirring tank body is connected with a discharging pipe, a stirring mechanism for preventing precipitation is arranged in the stirring tank body, and a stirring cover is installed at the top of the stirring tank body. The stirring tank is novel in structure, biogas residues at the bottom of the stirring tank can be rolled up along with stirring, biogas slurry condensation shells generated on the upper portion of the stirring tank are fully scattered, the interior of the stirring tank is kept in a flowing state, meanwhile, the biogas slurry is heated, the purpose of activating biogas slurry reaction is achieved, the efficiency of biogas production from the biogas slurry is improved, and energy is saved. And the yield of biogas is greatly improved.

The present application belongs to the technical field of excrement treatment, and particularly relates to an integrated rural toilet excrement deep separation treatment equipment, aiming at the problems of poor operation stability, and unsatisfactory removal rate of total phosphorus and ammonia nitrogen pollutants of the existing equipment, the present application proposes the following scheme, including a solid-liquid separation module, an anaerobic treatment tank, an aerobic treatment tank, and a liquid phase flocculation unit, the present application separates the solid phase and the liquid phase of the excrement through the solid-liquid separation module, after the liquid phase is flocculated by the liquid phase flocculation unit, the liquid phase and the solid phase are put into the corresponding fermentation zones of the anaerobic treatment tank for anaerobic fermentation treatment, the liquid phase is transported to the aerobic treatment tank for further aerobic treatment, realizing integrated treatment of solid-liquid separation, anaerobic biogas production and aerobic denitrification of the rural toilet excrement, and the solid phase and the liquid phase after the integrated treatment can be further utilized, which is extremely suitable for use in rural areas.

This invention belongs to the field of multi-energy dispatching technology, specifically a method and system for multi-energy coordinated adaptive dispatching of photovoltaic, biogas, and thermal storage loads. The method includes establishing a multi-energy coupled system model encompassing photovoltaic, biogas, heat pump, thermal storage, and electrothermal loads; characterizing the nonlinear influence of fermentation temperature on biogas production rate and dynamic heat balance; constructing a two-stage rolling optimization framework: the first stage uses the fermentation cycle as a window to determine the temperature setpoint and biogas storage boundary; the second stage uses a 24-hour window to jointly optimize grid interaction, heat pump heating, thermal storage charging and discharging, and adjustable loads; constructing a Markov decision process in the day-ahead dispatching stage, and solving it using an improved approximate dynamic programming approach; and issuing dispatching commands based on the optimal decision sequence to complete closed-loop execution. This invention achieves coordinated optimization across fermentation cycles and day-ahead dispatching, effectively addressing uncertainties in photovoltaic output and load, and improving renewable energy absorption rate and system operating economy.

The utility model relates to an efficient high-solid-content biogas preparation device, and belongs to the technical field of biogas production, the efficient high-solid-content biogas preparation device comprises an outer-layer tank body and an inner-layer tank body, the inner-layer tank body is located in the outer-layer tank body, and the inner-layer tank body is communicated with the outer-layer tank body through a top opening; a stirring device and a discharging pipeline are arranged at the top of the outer-layer tank body, a liquid outlet pipeline communicated with the discharging pipeline is arranged in the outer-layer tank body, and the stirring device is communicated with the discharging pipeline and the liquid outlet pipeline; and a slag discharging pipeline communicated with the outside is arranged in the inner-layer tank body. According to the high-efficiency high-solid-content biogas preparation device provided by the utility model, a liquid circulation structure of the inner tank body and the outer tank body is designed, so that the retention time of biomass in the outer tank body is prolonged, the sufficient fermentation of the biomass is ensured, and the fermentation efficiency is improved; the stirring device is communicated with the blanking pipeline and the liquid outlet pipeline, so that uniform mixing of the biogas slurry and the biomass is ensured, and meanwhile, high solid content (gt; 50%), so that the mass of biomass in the fermentation tank is enough, and the ratio of daily gas production to the volume of the tank body is (5: 1)-(10: 1).

The invention discloses an MEC reactor for promoting sludge deamination and strengthening anaerobic digestion capability by coupling oxides, and relates to the field of anaerobic digestion treatment of sludge in a sewage treatment plant and resource utilization of biogas, the MEC reactor comprises an MEC reactor, an oxidation-reduction potential detection device, a hydrogen detection device, a PLC control module and an oxide adding device; the oxide adding device takes air as an oxide, the air is converted into micro-nano bubbles through a microporous aerator, and ammonia nitrogen is oxidized into nitrate nitrogen; oRP and hydrogen partial pressure in the MEC reactor are monitored in real time through the oxidation-reduction potential detection device and the hydrogen detection device respectively and transmitted to the PLC control module, and the ORP and the hydrogen partial pressure in the MEC reactor main body are intelligently and accurately controlled according to a negative feedback regulation mechanism. The MEC reactor disclosed by the invention relieves the inhibition effect of partial pressure of ammonia nitrogen and hydrogen on methanogens while deaminizing the sludge, improves the biogas yield and strengthens the anaerobic digestion capability of the MEC reactor.

The utility model provides a mixing pretreatment system for dry-process biogas, and relates to the technical field of biogas production. The utility model provides a dry-process biogas mixing pretreatment system which comprises a feeding bin, a mixing pool and an auger, the feeding bin and the mixing pool are deeply excavated underground, a vibrating screen is further horizontally arranged in the feeding bin, and the horizontal height of the vibrating screen is equal to that of the ground. The mixing pretreatment system can solve the problem of low production efficiency caused by more impurities and large blocks of excrement, so that the equipment maintenance is reduced, the fermentation period is shortened, the operation efficiency and the stability of a fermentation system are improved, and the mixing pretreatment system can also be suitable for feeding in a cold environment.

The invention discloses a treatment method suitable for livestock breeding wastewater, and relates to the field of wastewater treatment.The wastewater sequentially passes through a pretreatment unit, a biochemical treatment unit, an advanced treatment unit and a solid waste resourceful treatment unit, and the pretreatment unit comprises solid-liquid separation, water quality adjustment and preliminary flocculation precipitation; the biochemical treatment unit comprises anaerobic treatment and a two-stage A / O process. Through an integrated process of pretreatment, two-stage A / O biochemical treatment, hollow fiber nanofiltration and contact oxidation, synergistic deep removal of organic matters, nitrogen, phosphorus and chromaticity in the breeding wastewater is realized, the effluent quality is excellent and stable, the impact load resistance of the system is high, energy and resource recovery is realized through UASB biogas production and sludge composting, and the method is suitable for industrial production. Optimized membrane molecular weight cutoff and automatic control ensure long-term stable operation of a membrane system, membrane concentrated water backflow avoids secondary pollution, and a set of efficient and recycling complete solution is formed.

The disclosed technologies provide a multi-stage system and process for converting lignocellulosic feedstock into high-quality methane-rich biogas. The technologies include an initial anaerobic secretome bioreactor (ASB1) operating under low-moisture, mesophilic conditions, which maximizes enzymatic hydrolysis, acetogenesis, and partial acidogenesis of the feedstock while producing biogas. ASB1 produces a semi-solid effluent rich in partially degraded organic compounds, residual lignin, and microbial biomass. A subsequent thermophilic anaerobic secretome bioreactor (ASB2) accepts this effluent as a substrate and facilitates further enzymatic breakdown and pasteurization through thermophilic microbial activity, producing an effluent optimized for methanogenesis. The final methanogenic digestion stage processes ASB2's effluent, converting it into methane with minimal carbon dioxide content, thus enhancing biogas quality and yield. This multi-stage process efficiently breaks down complex organic materials while minimizing inhibitory byproducts, enabling high-efficiency biogas production suitable for energy applications.

The utility model relates to the technical field of livestock manure treatment, in particular to an anaerobic biogas production device for livestock manure, which comprises a base plate, a support component is arranged on the upper surface of the base plate close to the left side, a hydrolysis component and a methane component are sequentially arranged in the support component from top to bottom, and a filter pressing component is arranged on the upper surface of the base plate close to the right end. The filter pressing assembly comprises a treatment barrel and a third sealing cover mounted at the top of the treatment barrel; according to the anaerobic biogas production device for the livestock and poultry manure, by arranging two limiting rings, rapid installation and matching of the hydrolysis cylinder and the reaction cylinder are achieved, the hydrolysis cylinder and the reaction cylinder are connected through a water outlet pipe and a pumping pump, heating matching of the interiors of the hydrolysis cylinder and the reaction cylinder is achieved through a first heating rod and a second heating rod, and under matching of a conveying pump, the biogas production efficiency is improved. A biogas residue mixture obtained after reaction in the reaction cylinder is conveyed to the treatment cylinder, under cooperation of a hydraulic cylinder, biogas residue dehydration cooperation is achieved through a pressing plate, and under cooperation of a clamping plate and a pull ring, a filter screen plate facilitates biogas residue taking-out and cleaning cooperation.

The utility model discloses a dry-method biogas fermentation discharging system, and belongs to the technical field of biogas production through anaerobic fermentation. The dry biogas fermentation discharge system comprises an anaerobic fermentation tank, a discharge pipeline assembly, a buffer tank and a mixing pool, wherein the discharge pipeline assembly is communicated with the anaerobic fermentation tank and the buffer tank; the discharging pipeline assembly comprises a first discharging pipeline, a second discharging pipeline and a third discharging pipeline, the first discharging pipeline is arranged at the bottom of the anaerobic fermentation tank, the second discharging pipeline is arranged on the side face of the anaerobic fermentation tank, the first discharging pipeline and the second discharging pipeline are both communicated with the third discharging pipeline, and the third discharging pipeline is communicated with the anaerobic fermentation tank. And the third discharge pipeline is communicated with the buffer tank. By arranging the discharging pipeline assembly and the buffer tank, on one hand, multi-point uniform discharging of the anaerobic fermentation tank can be achieved, and on the other hand, it can be ensured that the discharging amount can be accurately metered while it is avoided that overflow occurs after the mixing pool is full of materials discharged by the anaerobic fermentation tank.

The invention discloses a method for regulating fatty acid metabolism by utilizing condiments to strengthen anaerobic digestion of kitchen waste to produce marsh gas, and relates to the field of kitchen waste treatment.The method comprises the following steps that piperine condiments in the kitchen waste are recognized and utilized, residual sludge is added into the kitchen waste containing piperine, the mixture is mixed to be uniform, and the marsh gas is obtained; controlling the concentration of piperine in the mixed material within a certain range interval, and adjusting the pH value; and feeding the treated mixed material into an anaerobic digestion reactor, and monitoring the biogas yield and the daily gas yield, so as to realize the enhancement of biogas production by anaerobic digestion of the kitchen waste. The risk of acidification caused by propionic acid accumulation in the kitchen waste anaerobic digestion reactor can be effectively eliminated, and stable operation of the system is ensured; fatty acid such as propionic acid is used as an important substrate for methane production and can be thoroughly utilized to further strengthen methane production, and the resource recycling rate of organic solid waste is effectively increased; the applicability of the kitchen waste anaerobic digestion reactor is further improved.

The invention discloses a biogas fermentation device and a control method, and relates to the field of biogas production and anaerobic fermentation. At present, the traditional small-sized fermentation device has the technical problems of unstable fermentation efficiency, unstable fermentation temperature, non-uniform stirring and the like. The device comprises a stirring motor, a bracket, a stirring paddle, a digestion tank, an air pump, a feeding tank, a feeding valve, a bolt, an air outlet hole, an air pipe, an air collection bag, a water jacket connection thermometer, a water pump and a heating device, a pH meter is arranged on the left side of the bottom of the digestion tank, and a discharging valve is arranged on the right side of the bottom of the digestion tank. Through sensor feedback, a closed-loop control system is constructed, the stirring speed can be automatically or semi-automatically adjusted, the feeding opportunity can be controlled, and the fermentation temperature can be stabilized, so that the technical problems of large environmental parameter fluctuation, frequent manual intervention, unstable fermentation efficiency and the like of a traditional small fermentation device are effectively solved; the experiment reliability and the operation convenience of miniaturized biogas fermentation are obviously improved.

Installation and method for treating a feed gas stream (1) comprising carbon dioxide and methane by membrane permeation, said feed gas stream comprising at least 90 mol% carbon dioxide and between 0.5 and 10 mol% methane, and said apparatus comprising a compressor (8) configured to compress the feed gas stream (1) to a pressure between 2 barg and 16 barg, a membrane separation unit (3) configured to receive the feed gas stream (1) and to provide a permeate (2) and a retentate (4), a feed line (5) for the feed gas stream (1) to the membrane separation unit (3), and a retrieval line (9) for the retentate (4) configured to send the retentate (4) to a biogas production and / or storage unit. Abbreviated figure: Fig. 1

The present invention discloses a method and a compact equipment to increase the calorific value of biogas by methanation of CO2 with H2 (Sabatier reaction), relayed on a microreaction system that use geometric periodic open cellular structures (POCS), in which the catalytic system is embedded, to intensify the gas reaction. The compact equipment enables the delocalized biogas producers to benefit the CO2 fraction by increasing the calorific value of gas, avoiding the emission of this gas to atmosphere.

The invention discloses a method for efficiently removing nitrogen and phosphorus pollutants in biogas engineering, which adopts a'one-pot method 'to prepare magnesium-phosphorus modified hydrothermal carbon and coproduce carbon quantum dots, and fully utilizes the'pore adsorption-metal collaboration-chemical precipitation' functions of the magnesium-phosphorus modified hydrothermal carbon on nitrogen and phosphorus. The function of low-concentration nitrogen and phosphorus is further utilized by enhancing photosynthesis of microalgae through carbon quantum dots, the magnesium-phosphorus modified hydrothermal carbon is applied to a biogas slurry purification stage and an anaerobic fermentation biogas production stage, and the magnesium-phosphorus modified hydrothermal carbon is added in the anaerobic fermentation stage of a biogas project to remove nitrogen and phosphorus in situ; in the biogas slurry purification stage, magnesium-phosphorus modified hydrothermal carbon is firstly added to remove high-concentration nitrogen and phosphorus, then microalgae coupling carbon quantum dots are inoculated to enhance nitrogen and phosphorus removal, and the effect of multi-section collaborative cascade pollution reduction of a biogas project is achieved.

The invention discloses a method for preparing a bio-organic fertilizer through straw dry fermentation and co-producing biogas, and relates to the technical field of straw treatment. The method comprises the following steps: treating straws by laser etching, plasma and ionic liquid, pretreating by combining microwave and terahertz radiation, screening and modifying strains, preparing a microbial agent by using a composite culture medium, a micro-fluidic reactor and a photobioreactor, adding nano mineral substances and a composite binder when raw materials are blended, fermenting by adopting a bionic fermentation tank, and intelligently controlling temperature and ventilating; the biogas is purified and detected by an advanced technology, and the organic fertilizer is prepared by a special process. The straw is efficiently treated, the fermentation efficiency is improved, the biogas yield is greatly increased, and the high-quality bio-organic fertilizer is produced; the advantages of environmental protection, energy production and soil improvement are integrated, straw resource utilization is achieved, and multiple economic, social and environmental benefits are brought.

The invention discloses a method for improving the efficiency of producing methane by solid anaerobic fermentation of agricultural and forestry residues through wood fiber pretreatment, and belongs to the technical field of biomass energy utilization. The method comprises the following steps: carrying out one or more coupling modes of physical pretreatment, chemical pretreatment and biological pretreatment on crushed and screened agricultural and forestry residues; the pretreated agriculture and forestry residues are used as a fermentation substrate, the water content and the element proportion are adjusted, anaerobic digestion sludge is inoculated, solid anaerobic fermentation is conducted for 25-35 days at the temperature of 30-55 DEG C, and biogas is collected. According to the invention, the wood fiber structure and components are optimized through physical-chemical-biological single or coupled pretreatment, and the solid anaerobic fermentation biogas yield and methane purity can be effectively improved in combination with accurate regulation and control of the ratio of carbon, nitrogen, phosphorus and sulfur and adaptive fermentation conditions; the energy consumption, the reagent consumption and the pollution abatement cost in the biomass energy preparation process are obviously reduced.

The present invention relates to a system for increasing biogas production and minimizing process waste, wherein high-concentration organic food waste water, organic sludge and the like generated in a food waste treatment process are recycled in the process. According to the invention, the anaerobic digestion tank, the dryer, the deodorization furnace and other main devices are constructed into two stages, and the devices are linked and combined at the same time, so that a novel system for recycling and recycling dried materials generated in the dryer and digested slurry, condensed wastewater and the like generated in the treatment process in the process is realized; thus, a system for maximizing the production of biogas and minimizing the discharge of process waste, which can reduce the energy cost along with the increase of biogas production, and minimize the discharge of process waste to reduce the cost of delegated processing, is provided.