98 results about "Digestate" patented technology

A process and an apparatus for the manufacture of biogas and a solids fraction from an organic waste feedstock is provided. The process involves thermal hydrolysis of the organic waste feedstock at a temperature from about 100 to about 220° C., a pressure from about 5 to about 20 bars, for a period of time from about 15 minutes to 4 hours, to produce a hydrolysate. The hydrolysate undergoes anaerobic digestion at a temperature from about 25 to 60° C., for a period of time from about 1 to 35 days to produce a biogas stream and a digestate. The digestate is separated into a solids fraction and a liquid fraction, and a portion of the solids fraction is recycled for further anaerobic digestion. The biogas stream, characterized as having a methane content from between 55 to 80% by volume, and the solids fraction, are recovered. The apparatus includes a receiving bin for receiving and supplying organic waste feedstock to a thermal hydrolysis reactor. The thermal hydrolysis reactor for processing the organic waste feedstock at a temperature from about 100 to about 220° C., a pressure from about 5 to about 20 bars, for a period of time from about 15 minutes to 4 hours to produce a hydrolysate. An anaerobic digester for processing the hydrolysate at a temperature from about 25 to 60° C., for a period of time from about 1 to 35 days to produce the biogas and a digestate, and a solids thickening tank for separating the digestate into the solid fraction, a liquid fraction and a secondary biogas fraction.

The invention relates to a method for recycling resources, in particular to a method for preparing biomass fuel from kitchen waste resources. The method for preparing biomass fuel from kitchen waste according to the present invention comprises sorting and crushing the kitchen waste, then dehydrating and deoiling, and anaerobically fermenting the solid materials in the kitchen waste after extracting the oil, and degrading the produced biogas Recycling, solid-liquid separation of the biogas slurry, the separated biogas residue is mixed with sludge, straw and other biomass materials, and dried and briquetted to make biomass fuel. The invention recycles kitchen waste and turns waste into treasure. It not only realizes the harmless and reduction treatment of kitchen waste, but also treats biomass waste such as sludge and straw, and the obtained products are completely burned without any waste. Secondary pollution, realize the comprehensive treatment of various wastes.

A wastewater treatment process uses enhanced primary treatment to remove suspended solids from raw wastewater. Primary sludge is treated in a fermenter. Primary effluent is treated by biological nutrient removal (BNR) to produce a treated effluent and waste activated sludge (WAS). The WAS is treated in an anaerobic digester, which also treats sludge from the fermenter. Anaerobic digestate is separated to provide a liquid effluent. The liquid effluent is stripped of phosphorous and returned to the BNR as a source of readily biodegradable carbon. Liquid in the fermenter may also be separated to provide a liquid rich in volatile fatty acids (VFAs). This liquid is returned to the BNR when additional VFAs are required.

Methods for steady state operation of an upflow anaerobic digester using organic matter that contains a portion of solid, non-digestible matter include (1) providing an upflow anaerobic digester, (2) providing a bacterial culture in the upflow anaerobic digester for the breakdown of organic matter, (3) introducing an influent into the upflow anaerobic digester, wherein the influent comprises a biodegradable component, a liquid component, and an amount of solid non-digestible matter, (4) operating the upflow anaerobic digester in a steady-state, (5) accumulating the solid, non-digestible matter in the upflow anaerobic digester, (6) and removing a portion of the accumulated solid, non-digestible matter from the upflow anaerobic digester through the bottom of the upflow anaerobic digester while maintaining steady-state operation of the upflow anaerobic digester. Steady-state operation of the upflow anaerobic digester is maintained by selecting a percentage of the total volume of the liquid and material that are flushed from the digester for a given period of time so as to preserve the steady-state of the bacterial culture.

The invention discloses a complete pellet feed for preventing diarrhea of young rabbits. The complete pellet feed comprises corns, soybean meal, cottonseed meal, sunflower seed meal, wheat bran, flour, malt sprouts, rice bran meal, alfalfa, saccharose, edible salt, calcium hydrophosphate, calcium powder, sodium bicarbonate, magnesium sulfate monohydrate, L-Lysine sulphate, a complex enzyme preparation, a composite microecological agent, yellow bentonite, methionine, composite vitamins, choline chloride, a mold adsorbent and a trace element additive. The complete pellet feed for preventing the diarrhea of the young rabbits is not added with antibiotics and is high in safety; the young rabbits do not have drug resistance to the complete pellet feed, and the possibility of abnormal fermentation of hindguts is reduced; intestinal tract movement is promoted; easily digested substances can be quickly digested in the front intestinal tracts of the young rabbits, so that abnormal easy fermentation chime caused by the substances reaching the hindguts is reduced, and the diarrhea of young meat rabbits is relieved; furthermore, due to the proper processing technical parameters of the preparation method disclosed by the invention, the diarrhea occurrence rate of the young rabbits is further reduced.

An anaerobic digester is fed a feedstock, for example sludge from a municipal wastewater treatment plant, and produces a digestate. The digestate is dewatered into a cake. The cake may be dried further, for example in a thermal drier. The cake is treated in a pyrolysis system to produce a synthesis gas and biochar. The gas is sent to the same or another digester to increase its methane production. The char may be used as a soil enhancer.

The invention is a method of two-phase anaerobic digestion where monitoring and adjusting the nitrogen status (carbon to nitrogen molar ratio, i.e. C/N molar ratio or total or ammoniacal nitrogen content) enables maintaining optimum conditions during the process. The method improves the use of a variety of feedstock materials or facilitates monodigestion of one feedstock. Especially the introduction of nitrogen rich feedstock materials in the process is amended. A community of hydrolyzing and acidogenic microorganisms in the first phase digester performs ammonification i.e. release of organic nitrogen as ammonia. Nitrogen and phosphorus are removed and recovered from the digestate which then undergoes biogasification in the second phase of the process. Reject water from biogasification can be recycled within the process.

A facility for treating and recycling animal waste (2), including a unit (6) for methanizing the waste including treatment of the obtained biogases, a cogeneration unit (8) delivering electricity and heat (32) from the biogases, and a unit for hydroponically cultivating microalgae (14) in photo-bioreactors supplied by the liquid phase (12) of the organic residues from the methanization. The facility further includes a unit for cultivating macrophytes (22) supplied with water (20) leaving the unit for cultivating microalgae, and a vermiculture unit (24) fed by harvesting the macrophytes (22) and by the sludge (36) coming from the raw digestate from the methanization.

Organic waste is treated by pyrolysis or by anaerobic digestion followed by pyrolysis of the digestate. The pyrolysis is performed in two staged reactors. The second stage reactor treats char produced in the first stage. The temperature of the first stage reactor is preferably 450 degrees C. or less. The temperature of the second stage reactor is higher than the temperature of the first stage, for example by 50 degrees C. or more. Optionally, there may be a char cooler, a water sprayer, or both downstream of the char outlet of the second reactor. In an exemplary system, a digestate outlet is connected to the inlet of the first pyrolysis reactor. A pyrolysis liquid outlet of the first pyrolysis reactor is connected to the digester. Char produced in the second pyrolysis reactor may be used as a soil amendment.

The invention discloses a method for removing large-particle undigested and undecomposed organic matter and sand in anaerobic digestive liquid stage by stage and a method for preparing organic liquid fertilizer base fluid with the anaerobic digestive liquid without large-particle undigested and undecomposed organic matter and sand as the raw material.Plant fibers and other large-particle undigested and undecomposed organic matter separated after staged treatment, sand and other inorganic matter are used as initial raw materials of solid biogas manure or soil conditioner, and anaerobic digestive liquid biogas residues and biogas slurry which are obtained through staged treatment are used as initial raw materials of the organic liquid fertilizer base fluid.By means of the method, the plant fibers and other large-particle undigested and undecomposed organic matter, sand and other inorganic matter can be removed from the anaerobic digestive liquid, an organic liquid fertilizer base fluid product is prepared by means of the anaerobic digestive liquid with the large-particle undigested and undecomposed organic matter, sand and inorganic matter removed, and accordingly the bottleneck problem about resource reuse of the anaerobic digestive liquid is solved.

Methods and systems for removal and recovery of phosphorus from wastewater and producing inorganic phosphorus complexes including digestate recycle.

A multi-stage anaerobic digester is designed to treat a high solids, stackable feedstock. The system may also receive a pumpable feedstock such as a slurry or sludge. In a first stage, the digestate circulates in one direction around a raceway such that the digestate may pass a feed inlet multiple times before leaving the first tank. An optional side stream loop withdraws fibrous material from near the top of the reaceway and return digestate with chopped fibers, preferably lower and further along the raceway. An outlet from the raceway located near, but upstream of the feed inlet discharges partially digested substrate to a second stage, which is operated as a stirred tank reactor. The two stages may be provided in a single tank with an internal wall separating a ring shaped outer portion from a cylindrical inner portion. The digester may be operated in a thermophilic temperature range.

The invention discloses a method for producing methane by using lignocellulosic materials. The method comprises the following steps of: crushing the lignocellulosic materials, adding the crushed lignocellulosic materials into an anaerobic reactor, inoculating an inoculum for carrying out primary fermentation to produce methane; after a methane producing peak, taking digestate out, mechanically dewatering until the water content is 60-75 percent, carrying out biological treatment, inoculating a microbial agent containing one or more of white rot fungi, monilinia fructicola and peurotoid fungi, under the conditions of inoculum size being 1-3 percent, water content being 55-75 percent and temperature being 20-35 DEG C, carrying out aerobic fermentation for 2-7 days; and then inoculating the inoculum for carrying out secondary anaerobic digestion to produce methane. Compared with a technology for producing the methane through pretreatment of the lignocellulosic materials through microorganism inoculating, the method has the advantages that the methane producing rate of the lignocellulosic materials can be increased by 27.64-47.89 percent, the consumption of the microbial agent is reduced by about 50 percent, the loss of readily decomposable organic matters in the lignocellulosic materials in a biotreatment process is greatly reduced, and the accumulated methane production yield of the lignocellulosic materials is increased by 21.77-41-32 percent compared with that in the biological pretreatment.

The invention discloses an in-vitro semi-dynamic simulation digestion method and device for aquatic products, and belongs to the technical field of in-vitro simulation digestion. The method comprisesthe following steps of: oral cavity simulation, specifically, adding an oral cavity simulation digestive juice and a CaCl2 (H2O) 2 solution into an aquatic product, and incubating to obtain an oral cavity simulation digested product; stomach simulation, specifically, adding a stomach simulation digestive juice into an oral cavity simulation digested product, and adding a hydrochloric acid solutionin batches until the pH value is 2.0-1.2, supplementing 20mL of the system with water, adding a CaCl2 (H2O)2 solution for incubation to obtain a stomach simulated digested product; and intestine simulation, specifically, adding intestine simulation digestive juice into the stomach simulation digested product, adjusting the pH value to 6.9-7.4 by adopting sodium hydroxide, adding water to supplement the system to 40 mL, and adding a CaCl2 (H2O) 2 solution for incubation to obtain an intestine simulation digested product. The simulated digestive juices are more scientific and comprehensive in formula, the pH value of the digestion condition is finer, the simulated digestion stage is not unchanged. Therefore, the method and device can better fit the digestion condition of a human body.

A method of treating a digestate material, comprising the steps of obtaining an anaerobically produced digestate exerting pressure on the digestate to remove water from the digestate to form a low-water digestate and including the further step of filtering the low-water digestate filtered through a filtration means.

The present invention provides a biogas production system comprising: at least one digester for generating biogas and digestate, each digester comprising: a first end portion, a second end portion, and a peripheral side-wall there-between; one or more inlets, wherein at least one inlet is arranged to receive organic substrates; one or more outlets, wherein at least one outlet is arranged to release biogas; and a feed system comprising a pit arranged to receive and supply said organic substrates to the digester, said inlet positioned adjacent to a lower portion of said pit, the pit arranged such that a weight of the organic substrates within the pit bias the organic substrates into the digester.

The invention provides a swine pasteurellosis vaccine enrichment medium, and relates to the field of biology. The swine pasteurellosis vaccine enrichment medium is prepared from the following raw materials by weight: 20.0g of meat liver and stomach membrane digestive juice powder, 8.0g of bovine pancreas digestive juice, 10.0g of peptone, 5.0g of NaCl, 1.0g of a growth promoting factor, and purified water added to 1000ml. A preparation method of the swine pasteurellosis vaccine enrichment medium comprises the following steps: adding all the raw materials for preparing the swine pasteurellosisvaccine enrichment medium into purified water, fully dissolving the raw materials, and carrying out sterilization at 121 DEG C for 15 minutes for later use. The invention relates to an application ofa synthetic dry powder culture medium in swine pasteurellosis vaccine production. The synthetic dry powder culture medium has the beneficial effects that commercial raw materials can be selected, theculture medium is clear, the number of cultured bacteria is high, and the freeze-drying survival rate of the bacteria is increased.

A spray dryer exhaust gas treatment system and process recovers waste heat, removes odors from the exhaust gas, or both. The spray dryer may be used to dry digestate from an anaerobic digester. Spray dryer exhaust is at least partially recirculated to the spray dryer, or condensable vapors are removed from the spray dryer exhaust, or both. Optionally, a bleed from a recirculating exhaust stream may pass through a combustion chamber. Preferably, waste heat is added to the recirculating exhaust stream or used to evaporate water upstream of the spray dryer. In a case where the spray dryer is used to treat digestate, a biogas burner may provide the combustion chamber and a source of waste heat. The system and method reduce odors from spray dryer exhaust by condensing odorous compounds, by combustion, or both while using waste heat and spray dryer exhaust gas recirculation to reduce energy consumption.

The present invention provides compositions, devices, and methods for affecting, among other things, weight loss and/or weight control, by sequestering nutrients or other compounds such as toxins fromabsorption in the digestive tract. The compositions, devices, and methods employ one or more members made of a compressible, absorbent matrix material. In various embodiments, the matrix material issuitable for the routine use. The compressible absorbent matrix material has a size, shape and/or geometry configured for efficient packing into a small space, and/or configured to absorb and substantially retain digested material in the stomach. The devices and the compositions may further comprise one or more hydrogel(s), soluble or insoluble fibers, waxes, and/or gums to provide the desired mechanical properties and/or absorptive or shielding properties.

Process for treating solid waste (10) containing an organic fraction, comprising an initial step of extrusion pressing (14) the waste with production of a solid fraction (16) and a liquor (18). The solid fraction is subjected to a milling treatment (20) at a pressure lower than the atmospheric pressure in a rotary mill that produces a sanitized dry solid and water. The liquor is subjected to a treatment of anaerobic digestion (34) in three subsequent steps, with production of biogas and of a digestate (42) that is subjected to evaporation under vacuum to obtain a concentrated compost and steam, re-used in other steps of the process. The sanitized dry solid and the biogas can be used as fuel to produce thermal and electric energy to be used in the process, which also allows surplus energy to be obtained.

The present invention relates to organic nitrogen fertilizers and methods for producing organic nitrogen fertilizers, including retrieving high concentration organic ammonia from discarded organic material.