40results about How to "Improve methane production efficiency" patented technology

The invention provides a method to decrease emission of carbon dioxide from combustion of fossil fuels or other hydrocarbons and to enhance the efficiency of methane production from anaerobic biodigesters. The invention involves feeding carbon dioxide from the exhaust gas of hydrocarbon fuel combustion to an anaerobic biodigester where biomass is anaerobically fermented to produce methane. Carbon dioxide is an electron acceptor for anaerobic fermentation, and thus some of the carbon dioxide is reduced to methane, which can again be used for fuel. In this way, at least a portion of the exhaust gas CO₂ is recycled to form fuel methane instead of being released into the atmosphere. Thus, the net CO₂ emission from burning a given amount of fossil fuel is decreased. Adding carbon dioxide to an anaerobic fermentation also increases the efficiency and amount of methane production in the fermentation.

The invention belongs to the field of sewage treatment and specifically relates to an efficient sludge resource utilization method. The method mainly comprises links of sludge concentration, pretreatment, solid-liquid separation, anaerobic digestion, preparation of a sludge adsorbent and the like. The operation method comprises the following steps: sludge from a sewage treatment plant is firstly concentrated to a proper concentration; pretreatment of calcium and alkaline agents mixing combined with other methods is then carried out; and solid-liquid separation is conducted, the liquid part undergoes anaerobic digestion for production of methane, and the solid part undergoes anhydration or pyrolysis to prepare sludge charcoal. By the pretreatment including the calcium and alkali mixing treatment process, organic substances in the sludge can be released, and those organic substances can be subjected to anaerobic digestion through an effective anaerobic reactor for production of methane. By calcium and alkali mixing, on one hand, most of phosphorus in the sludge can be maintained in sludge solids to reduce release of phosphorus during the pretreatment process, and the content of phosphorus in the prepared sludge charcoal is high. On the other hand, the sludge solids can be activated and modified, and the prepared sludge charcoal has good adsorption characteristic.

The invention discloses a method for increasing kitchen waste high solid fermentative produced biogas, and belongs to the technical field of treatment control and environmentally-friendly purification treatment of solid waste. The biogas is produced in a high solid-state anaerobic fermentation way, so that not only can the kitchen waste be effectively treated and the harmless treatment, reduction and recycling of the solid waste be realized, but also the tolerance of methanogens to organic acid can be improved, and the methanogenesis efficiency of high solid-state anaerobic fermentation for the kitchen waste can be improved. A fermentation system is stable to operate, the kitchen waste treatment effect is good, and the energy recovery rate is relatively high.

The invention discloses a device and a method for producing methane by sludge removal filtrate. The device comprises an anaerobic reactor, wherein the anaerobic reactor is divided into a sludge reaction area, a three-phase separation area and a gas chamber from top to bottom; the sludge reaction area is provided with a conductive carrier layer; a conductive carrier in the conductive carrier layer consists of carbon fibres and carbon black at the mass ratio of (1:1)-(2:1). The carbon fibres and the carbon black are arranged in the anaerobic reactor to serve as the conductive carrier layer, so that electrons are transferred between methanogenic archaea and syntrophism bacteria through electron carriers of hydrogen, methanoic acid or the like, and inter-specific electron transfer can also be performed directly; therefore, more methane producing ways are provided for producing methane bacteria; the conductive carrier layer is fixed to the anaerobic reactor so as not to lose easily along with the outflow of water flow, and the conductive carrier layer can also be in full contact with wastewater so as to improve the methane producing rate; the water penetrating load of the conductive carrier layer is increased by adopting wastewater cycling, and meanwhile, a fluidizing effect of sludge is also improved; therefore, the methane producing efficiency is improved.

The invention relates to a preparation method of a CNTs/NiFe3O4 functional material, and belongs to the technical field of functional nano composite materials and environmental biology. The preparation method of the CNTs/NiFe3O4 functional material comprises the following specific steps: purifying and activating multiwalled carbon nanotubes; preparing CNTsFe3O4: preparing the CNTs/NiFe3O4 nano composite material. The CNTs/NiFe3O4 functional material prepared by the invention is used as an efficient biological catalytic material and a wave-absorbing material, has the characteristics of promoting oxidation-reduction reaction and electron transfer, is used as a stabilizer and a catalyst in sewage treatment anaerobic digestion reaction, can improve the methane yield and produce biomass energy,can play a role once being added, and has a good application prospect. The catalyst is good in dispersity in a reactor and uniform and consistent in reaction, and can be recycled to save the cost.

The invention discloses a pretreatment method of ferment antibiotic fungi residues. The pretreatment method comprises ultrahigh temperature reinforced acidogenic fermentation treatment of the ferment antibiotic fungi residues. Thermophilic hydrolysis acid-forming bacteria are used for performing high temperature anaerobic digestion treatment on the ferment antibiotic fungi residues, so that the fungi residues are hydrolyzed and acidified, antibiotic producing bacteria in the fungi residues are inactivated, and retained antibiotics are degraded. The fungi residues pretreated through the method can be directly subjected to subsequent biochemical treatment after being subjected to antibiotic removal. According to the method disclosed by the invention, the antibiotic producing bacteria can be completely killed, the antibiotics in the fungi residues can be removed, inhibition of high-concentration antibiotics to microorganisms is reduced, the difficulty in treatment of the fungi residues based on the subsequent biochemical method is reduced, generation of drug-resistant fungi and drug-resistant genes in the subsequent biochemical treatment is reduced, the harmless treatment efficiency of the antibiotic fungi residues is improved, and environmental protection is facilitated.

The invention provides a method for improving methane purity in a sludge anaerobic digestion generated biogas. The method comprises the following steps: concentrating organic sludge till a solid content is 20-40g/L; adding an additive, and controlling a pH value to 4.0-6.0, and carrying out a hydrolytic acidification reaction at 35-39 DEG C; adjusting the pH value of the sludge after hydrolytic acidification to 6.0-6.5, carrying out an anaerobic digestion reaction, and collecting a biogas. By adopting the method, calcium nitrite is adopted as the additive, so that sludge lysis and hydrolysis acidification can be improved, the anaerobic acid generation velocity of the sludge is greatly increased, furthermore, the sludge anaerobic digestion efficiency is improved; due to the addition of thecalcium nitrite, a function of blocking carbon is also achieved, the concentration of carbon dioxide in the biogas is also reduced, and the purity of methane is improved; as the pH value is adjusted twice, both acidic hydrolysis of the sludge under the action of the calcium nitrite is improved, and growth of hydrogen type methanogens in an anaerobic methanogenesis period is facilitated, the potential that the carbon dioxide is in reaction with hydrogen to generate the methane is improved, and the purity of the methane in the biogas is further improved.

The invention discloses a sludge and kitchen waste co-digestion system. A mixture storage tank is connected with a high-temperature fermentation tank through a first peristaltic pump; the high-temperature fermentation tank is connected with a cooling adjusting tank; the cooling adjusting tank is connected with a middle-temperature methane-producing reactor through a second peristaltic pump; the middle-temperature methane-producing reactor is connected with a digested mixture storage tank. According to the sludge and kitchen waste co-digestion system, sludge is uniformly mixed with kitchen waste at first; then an obtained mixture is pumped into the high-temperature fermentation tank to be subjected to hydrolytic acidification; finally, a sludge and kitchen waste fermentation mixture is pumped into the middle-temperature methane-producing reactor to produce methane. According to the method, a hydrolytic acid production phase and a methane production phase of a co-digestion process are carried out in two reactors; high temperature is controlled at the hydrolytic acid production phase and middle temperature is controlled at the methane production phase. The hydrolytic acid production efficiency is improved; meanwhile, an optimal living environment is provided for hydrolytic acid production bacteria and methane production bacteria; the inhibition, caused by the fact that sludge andkitchen waste single-phase co-digestion short-chain fatty acid (SCFAs) is excessively accumulated, on a methane production process is avoided.

The invention discloses a method for improving methane production efficiency of sulfate organic wastewater. The method comprises the following steps: taking anaerobic sludge; adding single-wall carbonnanotubes into the anaerobic sludge to form a mixed layer; then enabling the sulfate organic wastewater to pass through the mixed layer under an anaerobic environment; recycling methane generated inthe wastewater. Compared with the prior art, the method disclosed by the invention has the advantages that the single-wall carbon nanotubes are added to from anaerobic conductive particle sludge, andthe methane production efficiency of the sulfate organic wastewater can be remarkably improved; the methane yield can be improved by 20 to 30 percent. Furthermore, operation characteristics of a UASB(Upflow Anaerobic Sludge Blanket) are utilized and the carbon nanotubes be remained in a reaction system for a long period; a procedure of continuously adding the carbon nanotubes is avoided, so thata technology is simplified and the maintenance cost is reduced.

The invention belongs to the technical field of a biogas preparation method, and provides a technology method for high-efficiency anaerobic fermentation production of biogas by lignocellulose-rich materials. The technology method comprises the following steps of material pulping, biological treatment, facultative hydrolyzing and acid production, anaerobic fermenting, solid and liquid separating, refluxing and the like. The technology method solves the problems of low pretreatment efficiency of the lignocellulose-rich materials, overhigh concentration of reflux biogas, and low biogas productionefficiency in the prior art.

The invention discloses a packing liner for anaerobic dry fermentation of organic waste as well as a preparation method and an application of the packing liner. The packing liner is prepared by the step that nonwoven geotextiles wrap iron-based composite packing which is fixed with a needle-punching method, wherein the iron-based composite packing is prepared from 60%-65% by mass of zero-valent iron powder, 25%-30% by mass of crop stalks or bamboo powder and 5%-15% by mass of zeolite powder by mixed compounding. With the adoption of the packing liner, many defects of mixed addition of zero-valent iron in a traditional anaerobic dry fermentation process of the organic waste are overcome, the application is simple, the reliability is high, methane production efficiency of an anaerobic systemis effectively improved, and energy regeneration development of the organic waste is promoted.