116 results about "Anaerobic decomposition" patented technology

A process for the production of hydrogen from anaerobically decomposed organic materials by applying an electric potential to the anaerobically decomposed organic materials, including landfill materials and sewage, to form hydrogen, and for decreasing the time required to treat these anaerobically decomposed organic materials. The organic materials decompose to volatile acids such as acetic acid, which may be hydrolyzed by electric current to form hydrogen. The process may be continuously run in sewage digestion tanks with the continuous feed of sewage, at landfill sites, or at any site having a supply of anaerobically decomposed or decomposable organic materials.

The invention belongs to the technical field of water treatment, and in particular relates to a nitrogen-containing sewage treatment process and device for synchronously producing electricity and recovering a nitrogen element. The device comprises a bioelectrochemical system and a membrane distillation system, wherein the bioelectrochemical system comprises six parts, namely a positive electrode chamber, a positive membrane, a recovery chamber, a negative membrane, a negative electrode chamber, an outer circuit. The process comprises the following steps: entering nitrogen-containing sewage into the positive electrode chamber, carrying out microorganism anaerobic decomposition on pollutants and transferring electrons to a positive electrode, and further transferring the electrons to a negative electrode through the outer circuit so as to achieve electricity production; entering the nitrogen-containing sewage into the negative chamber for aerobic treatment, thus converting ammonia nitrogen into nitrate nitrogen; respectively entering ammonium radical in the positive electrode chamber and nitrate radical in the negative electrode chamber into the recovery chamber through the positivemembrane and the negative membrane under the driving of potential difference; and treating water in the recovery chamber with the membrane distillation system, and refluxing percolate to the recoverychamber, wherein a concentrated liquid is a solution containing high-concentration ammonium nitrate and the like, thereby achieving the recovery of the nitrogen element. The process provided by the invention is simple and has high efficiency and good economic benefits; and the treatment device is simple in structure, and is convenient for practical application.

The invention discloses a solar-aerated ecological water hyacinth floating island and a using method thereof. Water hyacinths used as aquatic plants with strong dirt removing power are selected as floating island plants to construct an ecological water hyacinth floating island; aeration equipment provides oxygen for the ecological floating island so that water body oxygen deficiency caused by excessive oxygen consumption generated under the breathing actions of the water hyacinths is avoided; solar energy used as a green energy source provides energy for an aeration pump, and an external power source is not needed, so that the aeration pump can be conveniently moved to a place which is polluted to the maximum extent; light porous suspended ceramsites are used as microbial carriers, and a great number of aerobic bacterial communities are propagated on the microbial carriers under an aeration condition, so that the black and odor phenomena caused by anaerobic decomposition are avoided; and due to the adoption of a specific grid structure, the separation of roots and stem leaves of the water hyacinths, the resource utilization of the stem leaves and the harmless treatment of the roots are conveniently realized, and the secondary pollution problem of the water hyacinths can be avoided. The solar-aerated ecological water hyacinth floating island has water purifying and landscaping functions.

The invention discloses a high-suspension easy-to-biochemically treated wastewater treatment method, which is applied to the treatment of various kinds of high-concentration easy-to-biochemically treated organic wastewater. The method comprises the following steps of 1, collecting wastewater, and performing advanced solid-liquid separation in a dissolved air flotation way; 2, performing anaerobic decomposition on the separated wastewater by using anaerobic and facultative tanks; 3, causing the decomposed wastewater to enter an MBR (membrane biological reactor) process system; and 4, disinfecting and sterilizing effluent obtained by an MBR process to discharge water reaching standards by using sodium hypochlorite. According to the wastewater treatment method, high-concentration easy-to-biochemically treated wastewater can be effectively treated, the construction fund can be greatly saved, a small land is occupied, and the method is stable in running, low in cost and particularly suitable for industrial production.

A system and method for continuous decomposition of organic material to produce biogas and compost in which successive reactor zones in a primary reactor are used in turn to receive organic material which is decomposed in situ anaerobically followed by aerobic decomposition and excavation of raw compost from the same reactor zone where it is received into the organic treatment facility. Organic rich liquor recovered during anaerobic decomposition is further decomposed in a secondary reactor from which spent liquor is returned to the primary reactor while biogas harnessed from both the primary and secondary reactors is treated, and optionally used to fuel the operation of the organic treatment facility or for sale as fuel or electricity.

A water quality in-situ purification method in river estuary relates to a water quality purification method in river estuary, especially relates to river estuary of convergence of lakes and rivers. A deposition pond, a aeration oxidation zone, a facultative pond and a floating island biological purification zone are disposed along rivers flowing into the lake direction in turns in river estuary of the horn-mouth shape region where watercourse crossing rivers and lakes, the method is: a, upstream polluted river water flows into the deposition pond for sedimentation, anaerobic decomposition and plant absorption; b, deposited river water flows into the aeration oxidation zone in order for increasing oxygen content; c, then the river water flows from the aeration oxidation zone into the facultative pond for degradation; d, degraded river water flows into the floating island biological purification zone at last, then the polluted water flows into lake by purification treatment. The invention uses in-situ purification method to process river water, no occupation of watercourse side land, resolving problem of rare land resource in river estuary and difficult to build water quality purification establishment. Key point of the invention provided water quality purification is intensifying absorption of natural hydrophyte and metabolism of microorganism for degrading pollutant in water, the water quality purification effect is obvious and brings no secondary pollution.

The invention discloses a livestock breeding waste water treatment method, applicable to treatment on various high-concentration organic waste waters. The livestock breeding waste water treatment method comprises the following steps of: 1, after breeding waste waters are uniformly collected, adding polymerized ferric sulphate, flocculating and carrying out primary separation by adopting a solid-liquid separator; 2, carrying out anaerobic decomposition on separated waste water by adopting a UASB (upflow anaerobic sludge blanket) anaerobic process; 3, carrying out a series of high grade materialization reactions when the decomposed waste water enter into an ultrasonic closed circuit generating device; 4, carrying out full oxidation reaction by virtue of an ozone reaction tower after the reacted waste water is subjected to physical filtering; and 5, filtering by virtue of filter materials such as activated carbon and zeolite, thus the waste water can reach up the standard and can be discharged. The livestock breeding waste water treatment method disclosed by the invention can effectively treat livestock breeding waste water, construction fund is greatly saved, less land is occupied, and stable operation cost is low, thus the livestock breeding waste water treatment method disclosed by the invention is especially applicable to industrialized production.

The invention discloses a method for zero discharge of waste water, which comprises the following steps that: the industrial waste water is subjected to anaerobic decomposition treatment and aerobiotic decomposition treatment in a waste water treating field in sequence, and 70 to 90 percent of organic matters in the waste water are decomposed; water discharged from the waste water treating field is treated by a hardness removing device, a filter, a residue hardness removing device, a degassing device and a multi-segmental reverse osmosis membrane set so as to obtain the concentrated water with TDS more than 80,000ppm; and the concentrated water is subjected to evaporation concentration by an evaporation crystallizer and a pressure filter, so that the waste solid with the water content of less than 15 percent is prepared. The method has the advantages of recycling over 99 percent of the waste water for reutilization, reducing environmental pollution, and reducing waste of water resources.

The invention belongs to the technical field of water treatment, and relates to a large-scale biological negative electrode microbial fuel cell stack apparatus. The apparatus comprises a plurality of biological negative electrode microbial fuel cells; organic matters in organic waste water are removed by anaerobe from a positive electrode; inorganic carbon in inorganic carbon source waste water is removed by aerobe in the negative electrode; the electric energy is recycled, wherein the microbial fuel cell pack comprises a positive electrode chamber, a negative ion / positive ion exchange membrane, a negative electrode chamber, a water path, and an external circuit; the waste water containing organic pollutants enters the positive electrode chamber; the pollutants are subjected to microbial anaerobic decomposition to generate electrons, the electrons are transmitted to the positive electrode, and then the electrons are transmitted to the negative electrode through the external circuit for realizing electricity generation. The apparatus is simple, efficient, free from a chemical catalyst, safe, reliable, green, environment-friendly, compact in structure, high in handling capacity, and convenient in actual applications.

The invention discloses an integrated pyrolysis and reduction system and a garbage disposal method. The integrated pyrolysis and reduction system comprises an anaerobic carbonization kettle, wherein the anaerobic carbonization kettle is provided with an extrusion feeding device which is used for feeding materials and blocking a material port; a heating chamber is arranged below the anaerobic carbonization kettle, the other side of the anaerobic carbonization kettle is communicated with an anaerobic decomposition kettle, the anaerobic decomposition kettle is respectively communicated with a thermal chemical reaction kettle and a waste residue oxidation chamber through a heating pipe, the thermal chemical reaction kettle is located above the waste residue oxidation chamber, a water seal type ash discharging port is formed below the waste residue oxidation chamber, a plurality of gas collecting pipes are arranged above the anaerobic carbonization kettle and the anaerobic decomposition kettle, and the gas collecting pipes are communicated with the thermal chemical reaction kettle. By the adoption of the anaerobic carbonization kettle, the extrusion feeding device, the anaerobic decomposition kettle, the thermal chemical reaction kettle, the waste residue oxidation chamber and the like, application space of garbage disposal is expanded, and generation conditions of pollutants of dioxins are controlled from sources.

An in-situ dry anaerobic composter containing 40% to 75% by weight solids and located in a section of ground including a pit having side walls and a bottom, an essentially impervious liner located in the pit such that the liner abuts the pit side walls and bottom to form a lined pit, a compostable material located in the lined pit and a gas management system for extracting a gaseous anaerobic decomposition product from the compostable material as well as methods for operating the anaerobic composter.

The invention discloses a leachate treatment method of a waste incineration power station. The leachate treatment method comprises the following steps: 1) introducing the waste incineration leachate into a sand settling pond, and preprocessing the waste incineration leachate to remove a great amount of settled sand in sewage; 2) introducing the leachate into a regulating pond, tempering the leachate, so that the PH of the inlet water of the sewage is kept at 5 to 6 in 2 days; 3) enabling the leachate to enter an intermediate temperature pond, introducing steam to adjust the temperature to be between 35 DEG C and 39 DEG C, and homogenizing the sewage temperature by virtue of a stirrer in the intermediate temperature pond; 4) introducing the incineration waste leachate after being processed in the intermediate temperature pond to have anaerobic decomposition, decomposing and converting various complex organic matters into marsh gas, so that the incineration waste leachate is primarily purified; 5) carrying out the denitrification / nitrification treatment; and 6) filtering. By adopting the leachate treatment method, the water yield of a leachate treatment system in the waste incineration power station, the residual concentrated liquid can be ensured to be completely consumed in the waste incineration power station, and the emission of the concentrated liquid can be prevented from severely polluting the environment.

The invention relates to a treatment method of garbage leachate. The garbage leachate is hydrolyzed and acidified through a regulating pond and then added with a flocculating agent and a coagulant agent and enters a flocculating settling pond for settling, and a supernatant enters an anaerobic sludge bed reactor for anaerobic decomposition, then is filtered and passes through an ammonia nitrogen absorbing membrane, then enters a membrane bioreactor after ammonia nitrogen is removed and is finally discharged on standard through a nanofiltration system. According to the treatment method disclosed by the invention, the ammonia nitrogen content is reduced and the biodegradability of sewage is enhanced by carrying out pretreatment by applying an ammonia nitrogen absorbing membrane technology, and the organic content of the sewage is effectively reduced and the quality of treated water reaches the standard by combining an MBR (Membrane Biological Reactor) with a nanofiltration technology; and the treatment method has the advantages of high adaptability, good quality of the treated water, lower treatment cost, utilizable generated methane and ammonium salt and good economic benefit and environmental benefit.

The invention discloses a soil treatment agent for preventing and treating the root-knot nematode disease and a preparation method and an application method thereof. The soil treatment agent is prepared from a nematode killing main agent and a nematode killing synergist; the nematode killing main agent is prepared from a nematode killing organic raw material and a decomposition promoting accessory; when the nematode killing organic raw material is a solid organic raw material, the nematode killing organic raw material is prepared from at least one of crop straws and sugar refinery offcut; whenthe nematode killing organic raw material is a liquid organic raw material, the nematode killing organic raw material is prepared from at least one of alcohol fermentation liquor and molasses; the decomposition promoting accessory is prepared from at least one of organic catalytic material and a special microorganism. The soil treatment agent disclosed by the invention can secrete to generate a great amount of nematode killing substances, such as an cell wall degrading enzyme, acetic acid and the like, in the indigenous microorganism anaerobic decomposition process, and a rapidly created anaerobic environment can also kill nematodes, so that the number of nematodes in soil with a high root-knot nematode disease incidence rate and a proportion of the category in a nematode community are reduced, and a root-knot nematode disease incidence rate of succeeding crops is reduced.

The present invention discloses a bioreactor, which comprises an assembly layer frame and a microbial deodorant and is arranged in a processor for treating liquid-state, gas-state, grease or sludge waste, wherein the waste stream flows through the bioreactor and contacts the microbial deodorant filled in the bioreactor, such that the waste is subjected to anaerobic decomposition or aerobic decomposition so as to achieve the rapid and exact deodorizing purpose, and the sludge treated by the microbial population can be recycled due to the deodorization and decomposition process so as to reduce the large amount of the sludge to be treated.

The invention provides an urban and rural resident domestic waste and wastewater reclamation ecological comprehensive treatment method and equipment. After urban and rural resident domestic waste is collected and sorted manually, organic matters and wastewater enter a pre-treatment pool, a solar heater is arranged at the top part of the pool, the pool is internally provided with a heating coil, and a cellular grid is arranged at the top part inside the pool; and materials after pre-treatment is subjected to acidified hydrolysis, anaerobic decomposition, quick infiltration separation and aerobic decomposition, after qualification through sampling test, reclaimed water is exhausted to the environment. Onsite treatment on the domestic waste and wastewater is carried out, the land occupied by a refuse landfill and a wastewater treatment plant can be greatly saved, fees for waste transportation, manpower, filed construction, and wastewater collection pipe network construction are saved, a huge operation fee is saved, pollution on surface water and air by toxic wastewater and toxic air generated by a sewer and the refuse landfill can be effectively reduced or eliminated, the method is simple and practicable, and good social effects and environmental protection effects can be realized.

The invention provides a household refuse and domestic sewage synchronous processing method, which comprises the following steps: sorting household refuse, separating inorganic substances which cannot be fermented and recycling for reutilization; crushing fermentable raw materials after sorting, and mixing the crushed fermentable raw materials with sewage, pretreating, and carrying out anaerobic decomposition and aerobic decomposition so as to effectively decompose various organic matters in the sewage. The quality of the processed water accords with related national emission standard. According to the method, household refuse and domestic sewage are processed on the spot. Thus, land occupation of refuse landfills is greatly saved, garbage transportation cost, oil cost, labor cost, field construction cost and sewage collection pipe network construction cost are saved, lands for building large-scale sewage treatment plants are saved, huge operating cost of a sewage treatment plant can be saved, and the pollution of toxic sewage and toxic gases generated from sewers and refuse landfills to surface water, underground water and the atmosphere can be effectively minimized or eliminated. In addition, the method provided by the invention is simple and easy to operate and has good social effects and environmental protection effects.

The invention discloses an intelligent maintenance-free sewage treatment device, which comprises a crushing device, an anaerobic decomposition pool, an earthworm filtering pool, an aerobic treatment pool, a sedimentation pool, a zeolite filtering pool, a disinfecting pool and a sewage detecting device, wherein the crushing device is used for crushing waste solids in sewage, the anaerobic decomposition pool is arranged at the back side of the crushing device, the earthworm filtering pool is communicated with the anaerobic decomposition pool, the aerobic treatment pool is communicated with the earthworm filtering pool, the sedimentation pool is communicated with the aerobic treatment pool, the zeolite filtering pool is communicated with the sedimentation pool, the sedimentation pool is also communicated with the anaerobic decomposition pool, the disinfecting pool is communicated with the zeolite filtering pool, and the sewage detecting device is used for detecting the water quality of outlet water of the disinfecting pool. The intelligent maintenance-free sewage treatment device has the advantages that the maintenance cost is lower, only the regular sludge state maintenance and checking are needed, and the maintenance period time is longer.

The invention relates to the technical field of sewage treatment and provides a total flooding type sewage treatment method with simultaneous nitrogen and phosphorus removal. The method comprises thefollowing steps: feeding sewage to be treated into an up-flow type aerobiotic reactor, and carrying out filtration by using filtering packing, nitration by using biological aerobiotic packing, organicmatter decomposition and dephosphorization in sequence, so as to obtain aerobic treatment sewage; feeding the sewage into the up-flow type aerobiotic reactor, carrying out anaerobic and anaerobic treatment by using biological anoxia packing and bio-bed packing in sequence, and carrying out denitrification, dephosphorization and anaerobic decomposition; finally feeding the sewage into a precipitate effluent discharger, passing through an adsorption material and a pH value adjusting material in sequence, and discharging the sewage. By adopting the method provided by the invention, the total nitrogen removal rate of a treated effluent is up to 85%, the total phosphorus removal rate is up to 70% or greater, the effluent can be directly discharged into a natural water body, and the treatment efficiency of black and odorous sewage can be effectively improved.

A mixer for anaerobic decomposition of sludge in a digester, captures and compresses biogas emitted by the decomposing sludge. The compressed biogas proceeds through supply lines to gas accumulating apparatus mounted in the lower portion of the digester, close to or on the digester floor. Biogas accumulates in the gas accumulating apparatus to emerge as large mixing bubbles from 6 inches to 10 feet in diameter along their largest dimension. The mixing bubbles are large enough to generate a strong mixing current in the sludge that moves sludge as the bubbles rise to the surface. The mixing current mixes the sludge containing dissolved and suspended pollutants to promote the conversion of the pollutants by microorganisms contained in the sludge.

A system and method for continuous decomposition of organic material to produce biogas and compost in which successive reactor zones in a primary reactor are used in turn to receive organic material which is decomposed in situ anaerobically followed by aerobic decomposition and excavation of raw compost from the same reactor zone where it is received into the organic treatment facility. Organic rich liquor recovered during anaerobic decomposition is further decomposed in a secondary reactor from which spent liquor is returned to the primary reactor while biogas harnessed from both the primary and secondary reactors is treated, and optionally used to fuel the operation of the organic treatment facility or for sale as fuel or electricity.

The invention provides an anaerobic decomposition treatment method for organic solid wastes and treatment system thereof. The method includes the following steps that solid-waste treatment objects aredehydrated, dried and decomposed under the heating condition, and carbon powder and decomposition gas are obtained; the decomposition gas is separated refined, and cracked oil, water and combustiblegas are obtained. The treatment system comprises a central control unit, an intermittent decomposition reaction kettle, a decomposition-gas separation refining device and a combustible-gas storage cabinet, wherein the intermittent decomposition reaction kettle, the decomposition-gas separation refining device and the combustible-gas storage cabinet are sequentially communicated, and the central control unit controls the intermittent decomposition reaction kettle, the decomposition-gas separation refining device and the combustible-gas storage cabinet to run. By means of the intermittent treatment method, miniaturization treatment can be achieved, the treatment scheme is simple, few devices are used, the cost is low, the organic solid wastes are not required to be sorted and smashed at thefront stage, are directly put into the intermittent decomposition reaction kettle, and can be decomposed and converted into 'oil', 'gas' and 'carbon', the treatment process is closed in the whole process, and pollution is not charged in the environment.

The invention relates to a technology for treating roasted eel industrial sewage. The technology is characterized by comprising the following steps of: (A), oil isolated primary precipitation treatment; (B), anaerobic decomposition treatment; (C), primary contact oxidation treatment; (D), primary standing return sludge precipitation treatment; (E), secondary contact oxidation treatment; (F), sandfiltration treatment; (G), secondary standing left sludge precipitation treatment; and (H), multistage precipitation treatment. A system for treating the roasted eel industrial sewage is characterized by comprising oil isolated primary precipitation equipment, anaerobic or anoxic acidification equipment, primary contact oxidation equipment, primary standing return sludge precipitation equipment, secondary contact oxidation equipment, sand filtration equipment, secondary standing left sludge precipitation equipment, multistage supernate tanks, left sludge precipitation equipment and control equipment for controlling the system. The technology and the system for treating the roasted eel industrial sewage can effectively degrade organic substances.

The invention provides a hidden sewage treatment method and equipment. The hidden sewage treatment method comprises the following steps of: firstly, biochemical reaction: sealing and storing sewage for anaerobic decomposition, then introducing air for aerobic decomposition, finally precipitating, pumping lower sludge and enabling upper liquid to enter the next step; secondly, catalytic reaction: adding a catalyst in liquid obtained by reaction in the first step to enable pollutant in the sewage to be oxidatively degraded to generate innoxious substances; and thirdly, membrane treatment: filtering a reaction product in the second step through an ultrafiltration membrane, removing residual impurities from water and finally sterilizing to obtain purified water. The hidden sewage treatment method and equipment provided by the invention have the beneficial effects that due to the adoption of biochemical and efficient catalytic technology integrated government, hazardous and noxious substances with high concentration and high difficulty can be treated; and the equipment becomes compact by an underground hidden mode and integrated combination.

The invention discloses a hydraulic stirring anaerobic jar, which comprises a jar body. A sludge discharge device is arranged at the bottom layer of the jar body, at least two hydraulic stirring devices are arranged on the peripheral wall of the jar body above the sludge discharge device in a surrounding manner; each hydraulic stirring device comprises a stirring water pumping pipe, the end part of the stirring water pumping pipe is inserted in the jar body, the stirring water pumping pipe is connected with a sludge pump, and the sludge pump is connected with a swirl generator. According to the hydraulic stirring anaerobic jar, the hydraulic stirring devices pump anaerobic liquid out of an anaerobic decomposition area by utilizing the sludge pump, repeatedly charge the pumped anaerobic liquid into the lower layer in the jar body to form swirls, so that sludge including anaerobe in the lower layer is fully mixed with the anaerobic liquid; along with the cycle operation of the sludge pump, the anaerobe in the anaerobic decomposition area is fully attached to the surfaces of organic matters, so that the anaerobic efficiency is greatly improved; the reaction state of an acidification reaction area is not broken, and meanwhile, the acidification reaction is facilitated; the structure is simple, the maintenance is convenient, and the sludge gas output efficiency of the anaerobic jar is greatly improved.

The invention discloses a method for processing polyurethane (PU) synthetic leather wastewater, and belongs to the technical field of wastewater processing. The method includes the steps of preprocessing high-concentration PU synthetic leather wastewater through electrocatalysis flocculation so as to decompose part of large-molecular organic matter in wastewater and improve biodegradability of wastewater, conducting efficient gradient anaerobic reaction processing on the PU synthetic leather wastewater preprocessed through electrocatalysis flocculation, conducting multi-stage and multi-step anaerobic decomposition on high-concentration organic matter in a gradient anaerobic reaction zone, and conducting thorough aerobic biochemical degradation on anaerobic output water through MBBR so as to achieve the effective degradation and up-to-standard discharge of high-concentration synthetic leather wastewater. A reactor related to the method is compact in structure, small in occupied area, high in process integrity, stable in running and low in processing cost.

The invention discloses a method for producing organic fertilizer by using livestock manure. The method comprises the following steps: S1, mixing livestock manure and crop straws according to a givenweight ratio; S2, before a compost mixture is placed into a reaction tank, adding a given amount of water into the compost mixture; and S3, placing the compost mixture into the reaction tank, performing the spontaneous reaction of the compost mixture for one week in a closed state of the reaction tank; placing a given amount of oxygenation agent on the bottom of the compost mixture in the reactiontank about every two weeks, and enabling the compost mixture to continuously perform the aerobic reaction; after the temperature in the reaction kettle is stable, stopping placing the oxygenation agent into the reaction tank; and after the feeding of the oxygenation agent is stopped, keeping the closed state of the reaction tank for one week. According to the method of the invention, not only canthe anaerobic decomposition and degradation reaction be performed for the compost mixture, but also the oxygenation agent is placed into the reaction tank to perform the aerobic decomposition and degradation reaction, the decomposition speed for converting the organic matters into organic fertilizer can be increased, and the fertilizer effect conversion rate can be increased.

A chemical mixture for treating biodegradable materials which when subjected to anaerobic decomposition generate environmentally harmful gases such as methane and hydrogen sulfide. The chemical mixture includes chemicals for inhibiting the production of methane and hydrogen sulfide (H2S). The mixture may be formed by: (a) combining compound(s) which inhibit the production of methane gas with compound(s) which inhibit the generation of hydrogen sulfide; and / or (b) using one or more compounds which can perform both functions. The biodegradable materials include all types of paper products. A liquid may be added to the chemical mixture to form a solution which may be applied, in any suitable manner, to biodegradable materials at any point during the manufacture of the materials and / or after the biodegradable materials are disposed of and ready for decomposition.

The present invention relates to a method for preparing natural gas by using coke oven gas. The method comprises that: (a) coke oven gas is introduced into an organic waste anaerobic treatment reactor; (b) under the effect of microorganisms in the anaerobic reactor, the organic waste is subjected to anaerobic decomposition to generate biogas adopting CH4 and CO2 as the main components, CO2 and the H2 in the coke oven gas are combined to generate CH4, and the CO and the CO2 in the coke oven gas and H2 generate CH4 so as to finally obtain the biogas adopting CH4 as the main component; and (c) separating and removing impurities in the biogas obtained in the step (b) so as to obtain the high methane content natural gas. Compared with the method in the prior art, the method of the present invention has the following advantages that the coke oven gas is introduced into the anaerobic reactor by using the microorganism to prepare the natural gas, the addition of the catalyst is not required, the high temperature and the high pressure are not required, most of the components in the coke oven gas can be converted into methane, and the new method is provided for solving of the problems of resource shortage, environmental pollution, irrational energy source structure and the like in the energy source field.

The invention discloses an improved purification tank and an A+AO+AO rural sewage treatment process and device with the same, relating to the field of rural sewage treatment. A three-phase separator of the improved purification tank can alleviate the air flotation effect and shorten the sedimentation time, bundled elastic filler devices in a filler sedimentation zone and a filler aeration zone have the strong water impact resistance, the film forming of filler is fast, the sewage treatment effect is good, and less sludge is generated. Sewage collected by a rural sewage pipe of each household is subjected to preliminary anaerobic decomposition in a conventional septic tank, and then enters into the improved purification tank for AO treatment, and effluent of the improved purification tank finally enters an XE-type purification tank of Daiki Environmental Protection Engineering (Dalian) Co., Ltd. to be further processed and discharged after reaching the standard, and has the total nitrogen and total phosphorus level A. The process is suitable for single-family and multi-family rural sewage treatment, has large processing capacity, high integration and convenient unified management.