85results about How to "Improve the efficiency of anaerobic digestion" patented technology

The invention belongs to the field of solid waste treatment and relates to a method for reducing sludge by adopting ultrasound-magnetic field coupling to disrupt sludge. The method comprises the following units: an aerobic biochemical unit is to remove organic pollutants through microbes in a biochemical tank; a sedimentation unit is to separate mud from water in a sedimentation tank; an ultrasound- magnetic field treatment unit is to disrupt rest of sludge by adopting ultrasonic wave and a magnetic filed to cooperate for more than 1 minute, wherein the frequency of the ultrasonic wave is 16-200kHz, the density of sound energy is 0.1-1.0W/mL, and the magnetic field strength is 300-20000Gs; an anaerobic digestion unit is to anaerobically digest the sludge in a digestion tank; and a sludge dehydration unit is to carry out solid-liquid separation by adopting centrifugal dehydration. The method greatly reduces the sludge disruption energy consumption, and the sludge is reduced by more than 80 percent when aerobic digestion is carried out to disrupt the sludge; in anaerobic digestion, the digestion time is reduced by more than 60 percent, the methane yield is increased by more than 35 percent, the sludge is reduced by more than 30 percent. The method has obvious economic benefits, thereby having popularization and application value.

The invention relates to an energy-saving recycling treatment disposal system and an energy-saving recycling treatment disposal process for an organic solid waste. The energy-saving recycling treatment disposal process mainly comprises a continuous sludge pyrohydrolysis anaerobic digestion section, a sludge dehydration heat drying section and a dry sludge, domestic garbage and biogas mixing incineration section. Due to the energy-saving recycling treatment disposal system and process disclosed by the invention, the innocent treatment of kitchen garbage, municipal sludge and the domestic garbage can be thoroughly realized by combining a high-temperature sludge anaerobic digestion technology with the high-organic matter characteristic of the kitchen garbage by utilizing respective characteristics of three solid wastes, applying a solid waste high-temperature incineration technology of mixed biogas, adopting a reasonable energy resource integrated means and applying an advanced high-temperature continuous pyrohydrolysis pretreatment technology. In addition, the energy-saving recycling treatment disposal process disclosed by the invention can also be used for realizing the recycling of the three solid wastes, improving the energy resource utilization efficiency of an integrated system, effectively reducing the input of external energy resources and reducing the operation cost. The energy-saving recycling treatment disposal process disclosed by the invention is capable of realizing the continuous operation of solid waste treatment, simple and reliable, simple in equipment, small in initial investment and has good environmental and economic benefits.

The invention relates to a method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge, which comprises the following steps: 1)a calcium peroxide processing unit: placing the calcium peroxide in the sludge, wherein the mass ratio of calcium peroxide to sludge is 0.01: 1-0.6:1, reacting for 1-24 hours, and hydrolyzing the sludge; and 2)an anaerobic digestion unit: after processing the calcium peroxide, performing anaerobic digestion on sludge under the effect of anaerobe and amphimicrobe in an anaerobic digestion tank, rapidly using an organic compound in the sludge, conversing to methane, carbon dioxide and water, increasing the sludge biogas output and then realizing the quantitative reduction. Compared with the prior art, the method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge has the advantages of low cost, shortened digestion time and easy enforcement.

The invention relates to the technical field of waste water treatment, in particular to a treatment process of waste water of dairy products, which comprises the following steps: firstly, removing floating materials in the waste water of the dairy products through a grid channel, and then carrying out primary treatment on the waste water through a regulating pond; degrading the waste water after primary treatment through an anaerobic baffled reactor (ABR), discharging the sludge obtained by degrading the waste water through the ABR into a sludge tank, and then pumping and transporting the sludge outward; discharging the waste water after ABR degradation into a middle sedimentation tank for solid-liquid separation, and discharging the waste water after separation in the middle sedimentation tank into an aerobic tank; then, aerating and degrading the waste water in the aerobic tank, and discharging the waste water after aeration treatment into a secondary sedimentation tank; and finally, carrying out solid-liquid separation on the waste water in the secondary sedimentation tank, and discharging the separated waste water after reaching standards. Thus, the treatment process of thewaste water of the dairy products, which is provided by the invention, has small discharge amount of the sludge and high treatment efficiency of the waste water.

The invention relates to a chemical enhancing pretreatment method of sludge anaerobic digestion. The method is characterized in that perferrate production waste liquid is added into sludge, and the pH value of sludge is controlled below 11; the materials are well mixed by stirring; the obtained sludge is added into an anaerobic digestion system, and mesophilic anaerobic digestion is carried out. According to the invention, anaerobic digestion gas yield of the pretreated sludge is improved by more than 60% than that of untreated raw sludge. The invention has the advantage that when the anaerobic digestion efficiency of sludge is improved, a treatment and disposal problem of perferrate production waste liquid is solved. Harms to the environment and to public health caused by discharging are avoided, and perferrate production waste liquid can be utilized as a resource.

The invention belongs to the field of sludge treatment and discloses a sludge recycle treatment method. In the method, sludge is recycled through the steps of hydro-thermal treatment, solid-liquid separation, adsorption through composite adsorption materials, anaerobic fermentation and the like. By means of the method, cost can be reduced to the maximum degree, waste is used for treating the sludge, and popularization is easy; nitrogen and phosphorus in the sludge are removed through the synergistic effect of a physical absorption method and a chemical precipitation method, the anaerobic digestion efficiency is improved, and meanwhile the technical problems that sediment crystals obtained after the nitrogen and the phosphorus are removed are difficult to recycle and likely to block a sludge removing pipeline and a pump body are solved; waste materials obtained after sludge removing of the composite adsorption materials can serve as controlled-release fertilizer in application, and waste is turned into wealth.

The invention provides a preparation method and application of iron-containing sludge-based biochar, which comprises the following steps: pouring excess sludge, as a raw material, generated by an urban sewage treatment plant into a 1 g/L FeCl3 solution to flocculate and adsorb trivalent iron salt, dehydrating the sludge to obtain iron-containing sludge; and putting the iron-containing sludge intoa tubular furnace, firing for 2 hours at 600 DEG C under the condition of nitrogen blowing to obtain a sample, namely the iron-containing sludge-based biochar. Results show that at 600 DEG C, ferric iron adsorbed by the sludge is converted into ferroferric oxide, so that the electrical conductivity of the biochar is improved; meanwhile, functional groups on the surface of the biochar are reservedat the temperature, so that the iron-containing sludge-based biochar has good charge-discharge performance. The iron-containing sludge-based biochar is added into an anaerobic reactor, so that the removal rate of organic matters and the yield of methane can be remarkably increased.

The invention provides a resourceful treatment method for penicillin fungi residues, wherein fungi residues produced during production of penicillin can be treated by adopting the steps of steam inactivation, enhanced pretreatment, mixing and blending, fungi residue blending, anaerobic co-digestion, concentrating and dewatering and the like. According to the invention, a treatment method low in energy consumption, high in efficiency and steady and reliable in effect is adopted, and drug residues in the penicillin fungi residues can be completely removed, thus realizing reduction and harmless treatment of the penicillin fungi residues.

The invention relates to a method for preparing feed by rapidly hydrolyzing vegetal biomass. In the method, vegetal biomass is pre-hydrolyzed by acidification at normal pressure by utilizing bi-hydrolysis treatment technology, catalyst is added for high pressure overheating steam hydrolysis cracking, and Mailard reaction is taken in an ammonia fixing tank for fixing ammonia; the shape of water and organic matter in straw is changed in the process, and the water in straw has no phase change, so the produced material has light fragrance. The technological process of the invention can shorten production period, reduce operation cost, improve operation safety and is more beneficial to industrialized production.

The invention discloses a treatment method suitable for anaerobic digestion of excess sludge. According to the technical scheme, the treatment method suitable for anaerobic digestion of the excess sludge is characterized by comprising the following steps of (1) measuring a pI value of the excess sludge through a Zeta potential method; (2) adjusting a pH value of an excess sludge system by means of acid liquid; (3) conducting centrifugal treatment on the sludge, and collecting supernate and solid sludge separately; (4) adjusting a pH value of the supernate by means of alkali liquid, conducting fractional precipitation to recover metal, conducting centrifugal treatment, and collecting a metal precipitate and an upper-portion solution separately; (5) dissolving the solid sludge again in the upper-portion solution and softened water until TS is 2-10%; (6) transferring the sludge into an alcoholization phase reactor, and carrying out sludge alcoholization reaction; and (7) transferring all sludge subjected to the reaction into an methane-production phase reactor for anaerobic methane production. According to the treatment method suitable for anaerobic digestion of the excess sludge, through an isoelectric point pre-treatment method, transformation of sludge organic matters into ethyl alcohol is promoted, and the specific yield of organic matter methane is improved.

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 relates to a disposal system of municipal dewatering sludge, and belongs to the technical field of environmental engineering. The disposal system comprises a high-temperature and high-pressure reactor, a sludge cooling device, a magnetic powder hopper, a stirrer, a magnetizer, an anaerobic digestion cavity, a magnetic powder separation device, a feeding hopper, a metal magnetic separation device, a dewatering device, an afterheat drying device and a mud cake collecting device. The anaerobic digestion efficiency of the sludge can be improved by the sludge preprocessed by the high-temperature and high-pressure magnetic powder and the magnetizer; heavy metal in the sludge can be effectively extracted by the metal magnetic separation device; the late sludge disposal difficulty is reduced; the magnetic powder added in the sludge can be effectively separated by the magnetic powder separation device, so that the magnetic powder can be recycled, and the cost is saved. The afterheat drying device fully utilizes the afterheat of the sludge preprocessed by the high-temperature and high-pressure reactor, so that the energy is greatly saved; system parameters are set on a computer, and the data is processed by computer program, so that the efficiency of the system is greatly improved.

The invention relates to an organic waste anaerobic digestion method. The method comprises the steps of adding organic waste, inoculum and a catalyst rich in high efficiency microorganisms to a reactor, and performing stirring for a reaction to generate methane. The catalyst adopts a magnet as a basal body and ferroferric oxide as a surface adsorber to enrich electrical activity microorganisms capable of realizing efficient anaerobic transformation of the organic waste and enable the microorganisms to be quickly combined with the ferroferric oxide on the surface of the magnet to form a biomembrane, the rate for generating the methane through anaerobic digestion is increased, the organic loading and the methane generating amount of an anaerobic digestive system can be increased, and the reaction period can be shortened. Compared with the prior art, the catalyst is used for enriching the electrical activity microorganisms capable of realizing efficient anaerobic transformation of the organic waste and enabling the microorganisms to be quickly combined with the ferroferric oxide on the surface of the magnet to form the biomembrane, the rate for generating the methane through anaerobicdigestion is increased, the organic loading and the methane generating amount of the anaerobic digestive system can be increased, and the reaction period can be shortened.

The invention discloses a hydraulic cyclone anaerobic digestion tower and a using method thereof. A flow guiding cylinder is arranged in the center of a tower body, a submersible motor is arranged at the middle part in the flow guiding cylinder, the lower part of the submersible motor is connected with a lifting impeller, the flow guiding cylinder is connected with two flow guiding tubes, a circle of annular flow stabilizing plates are arranged between the upper layer flow guiding tube and the tower body, a feeding tube which is used for communicating the external and the flow guiding cylinder is arranged at the bottom on the side wall of the tower body, a slag collection bucket is connected with the bottom of the tower body, the side surface of the slag collection bucket is connected with a slag discharge tube, and a biogas tube is arranged on a top cover of the tower body and is in signal connection with a pressure transmitter and an electric control box. According to the hydraulic cyclone anaerobic digestion tower disclosed by the invention, by utilizing a mode of a hydraulic cyclone, material stirring, scum crushing as well as raw and cooked material separation are realized, the anaerobic digestion treatment efficiency is improved, the biogas yield is increased, and the energy consumption of anaerobic digestion treatment is saved; and in addition, a changed intensity anaerobic digestion process is adopted according to the pressure of biogas, so that automatic running and regulation of a biogas production and utilization system can be realized. The hydraulic cyclone anaerobic digestion tower can be widely applied to anaerobic digestion treatment of high concentration organic wastes such as waste water, waste liquor, wastes, excrement, sludge and the like.

The invention discloses a kitchen waste treatment method. The kitchen waste treatment method comprises the following steps: a, performing pyrohydrolysis on mixed kitchen wastes and sludge; b, performing anaerobic digestion on the pyrohydrolyzed mixture; and c, performing biogas purification on the generated mixed gas in anaerobic digestion. Kitchen wastes are treated by virtue of pyrohydrolysis and anaerobic digestion successively, and pyrohydrolysis as pre-treatment can improve the anaerobic digestion efficiency, so that purposes of improving the sludge dewatering property, degrading organic matters and killing pathogenic bacteria are achieved, and meanwhile, the method can purify biogas by purification to use internal energy of the biogas, and the biogas residues can be used for preparing fertilizers or cultivating trees, thereby playing roles of saving energy and reducing emission, being green and environmentally friendly and sustainable in development on treatment of the kitchen wastes. The method disclosed by the invention can be applied to kitchen waste treatment.

The invention discloses a method of improving anaerobic digestion biogas production by solid residues of banana stalk through pre-treatment of steam explosion, wherein the method mainly comprises following steps: 1) material preparation: cross-cutting and longitudinally-cutting the banana stalk with moisture content controlled to be 20-50%; (2) steam explosion: feeding saturated steam until the pressure in a pot is 2.0-3.5 MPa and maintaining the pressure for 90-240 s, and instantly releasing the saturated steam; (3) material collection: collecting the raw materials subjected to the steam explosion and cooling the raw materials for later use; (4) anaerobic digestion: adding a certain amount of inoculation sludge to the pre-treated raw material, uniformly mixing the inoculation sludge with the raw material and performing sealed fermentation. Through the method, semi-cellulose and lignin in the raw material of banana stalk can be effectively degraded, thereby increasing the conversion utilization rate and the methane producing potential of the raw material of banana stalk. The method is simple in operation and is green and environmental-friendly.

The invention relates to a biomass high solid anaerobic digestion process for the separation and backflow of active sludge, which comprises the following steps of: 1, adding biomass into a high solid anaerobic reactor, and discharging after a reaction; 2, centrifuging the discharged materials by using centrifugal equipment, wherein after centrifugation is performed, an upper layer is a supernatant liquid layer, an intermediate layer is a sludge layer, and a bottom layer is a residual residue layer; 3, allowing the intermediate sludge layer to flow back to the high solid anaerobic reactor, and adding the biomass into the high solid anaerobic reactor; and 4, discharging after the reaction, and circularly performing the steps 2, 3 and 4. By the process, the problems of low loads, long retention period of hydraulic power, incapability of separating the retention period of the sludge from the retention period of microbes and the like in the anaerobic digestion process are solved, the high-load, high-stability and high-efficiency running of the biomass high solid anaerobic digestion process can be ensured, and the high-efficiency energy utilization of the biomass is realized.

The invention discloses an anaerobic reactor as well as a sludge anaerobic digestion process using the anaerobic reactor, which and belongs to the technical field of sludge treatment, and aims at solving the problem in the prior art that the sludge anaerobic digestion efficiency is low. The anaerobic reactor is characterizedin thatAccording to a key point of the technical scheme, the interior of the anaerobic reactor is divided into a biogas area and a reaction area from top to bottom, a stirring apparatus is located on the bottom of the reaction area, and the stirring apparatus comprises a stirring shaft, a driving motor driving the stirring shaft to rotate and stirring vanes fixed on the stirring shaft. The anaerobic reactor is suitable for the pretreatment of anaerobic digestion of sludge for producing a brick.

The invention discloses a method for preparation of an organic fertilizer from organic solid waste. The method includes: preheating an organic solid waste mixture with a solid content of 2.5-20% by a preheating reactor, then using hot steam with a pressure of 0.6MPa and at a temperature of 155-170DEG C to conduct thermal hydrolysis and digestion, making the treated material enter a fluidized anaerobic reactor by a buffer heat exchanger to carry out anaerobic digestion biogas production reaction, applying the produced biogas to a front-end heating link, sending a mixture obtained by anaerobic reaction to a screw type dehydrator and conducting steam drying and dehydration, adding a proper conditioning agent into a filter cake, then sending the mixture to a composting system to carry out aerobic composting treatment, thus finally obtaining the organic fertilizer. Compared with the traditional method of preparing organic fertilizer from organic solid waste, the method provided by the invention has the characteristics of high degree of automation, short biogas production time and high efficiency, achieves cyclic utilization of heat energy, greatly reduces the dosage of the conditioning agent, and has better effect.

The invention relates to a biogas residue thermal cracking solid product and an application method thereof. The application method comprises the steps that combined anaerobic digestion treatment is performed on sludge and garden waste, and part of obtained biogas residues are treated through press-filter dewatering and then prepared into material precursors under the hydrothermal condition; thermal cracking is performed on the material precursors, and products are smashed and screened through a sieve to obtain particles; the particles are mixed with inoculating sludge, the activity of inoculated microorganisms is enhanced, enhanced-type inoculating sludge is prepared, and the obtained enhanced-type inoculating sludge and the particles obtained through smashing and screening are reused in the anaerobic digestion treatment process. Accordingly, the methane generating efficiency in the combined anaerobic digestion process of the sludge and the garden waste is improved, the anaerobic digestion time is shortened, the waste treatment efficiency is improved, the waste utilization value is increased, and a green and environment-friendly novel municipal solid waste treatment and reclamation method is achieved.

The invention discloses a high-efficiency granular sludge anaerobic tower reactor, which includes a tower body. The tower body includes a water distribution area arranged on the lower part, a reactionarea arranged on the middle part and a three-phase separation area arranged on the upper part, the water distribution area is provided with a raw water inlet, the raw water inlet is provided with a water distribution pipe network extending into the water distribution area, the water distribution pipe network is provided with a plurality of water distribution spraying heads toward the bottom of the tower body, a reflux water suction pipe is arranged on the lower part of the three-phase separation area, the reflux water suction pipe is provided with a plurality of reflux suction nozzles towardthe top of the tower body, the reflux water suction pipe communicates with the raw water inlet through a reflux pump, the three-phase separation area is provided with sludge settling inclined plates,and baffle plates are arranged between the sludge settling inclined plates and the reflux water suction pipe. According to the high-efficiency granular sludge anaerobic tower reactor, by ensuring sufficient mixing of muddy water at the bottom of the reactor, return sludge flow is subjected to a secondary reaction in the three-phase separation area, then sludge and water are separated thoroughly bymatching of the multilayer sludge settling inclined plates and the baffle plates, and three-phase high-efficiency separation of the sludge, the water and gas is ensured.