42 results about "Digestate" patented technology

The invention belongs to the technical field of sewage treatment, and particularly relates to a lateral flow anaerobic ammonia oxidation effluent deep nitrogen and phosphorus resource recycling method which comprises the following steps: mixing treated anaerobic sludge digestion liquid and untreated anaerobic sludge digestion liquid in an intermediate water tank to form mixed inlet water; adding a magnesium source into the mixed inlet water in the middle water tank to form a middle mixed solution; transferring the intermediate mixed solution into a short-cut denitrification-anaerobic ammonia oxidation coupled struvite reactor, adjusting the pH value of the intermediate mixed solution, and adding a carbon source into the pH-adjusted intermediate mixed solution to form a reaction solution; and carrying out solid-liquid separation on a product obtained after the reaction of the reaction liquid, and discharging the separated liquid or systematically recycling the separated liquid. According to the invention, deep nitrogen removal and phosphorus resource recovery under the condition of low carbon source can be realized, and a new way is provided for subsequent deep treatment of a short-cut nitrification-anaerobic ammonia oxidation process.

A method of treating wastewater from a renewable fuel production comprises anaerobically digesting the wastewater to produce digestate and sludge, aerobically treating the digestate to produce an effluent and a second sludge, separating the effluent into a first filtrate and a first reject, treating the sludge, second sludge, and first reject in a solids-liquid separation apparatus to produce recovered water, directing the recovered water into the mixing tank, filtering the first filtrate in a nanofiltration unit to produce a second filtrate and a second reject, filtering the second filtrate in a first reverse osmosis unit to produce a third filtrate and a third reject, filtering the third reject in a second reverse osmosis unit to produce a fourth filtrate and a fourth reject, combining the third filtrate and fourth filtrate to form a product water, and combining the second reject and the fourth reject into a combined reject for disposal.

The present invention concerns a composition for a horticultural pot comprising a solid residue of digestate from methanization and / or a solid residue from composting and a biodegradable polymer chosen from polyhydroxyalkanoates (PHA), its preparation and its use in the manufacture of such a pot.

The method of the invention comprises the production of highly digestible hydrolysed keratinaceous material comprising the steps of (i) partly hydrolysing keratinaceous material with heat and pressure and (ii) optionally drying the resultant partly hydrolysed material comprising at least partly insoluble material and (iii) subjecting the optionally dried partly hydrolysed keratinaceous material to a chemical hydrolysis step with acid or base to obtain a highly digestible hydrolysed material, and (iv) purifying the highly digestible material. The invention further provides highly digestible keratinaceous material with an amino acid composition reflecting the amino acid composition of the raw material, wherein the amount of de-carboxylated amino acids is less than 500 ppm. Preferably all of the highly digestible material has a molecular weight lower than 10000 dalton, and preferably more than 95 wt % of the highly digestible keratinaceous material has a molecular weight of less than 5000 dalton.

A biogas slurry filtering system comprising a first tank configured to receive the biogas slurry to be filtered and a mixing device located in the first tank and configured to aerate the biogas slurry. The filtering system also comprising a filter configured to filter the biogas slurry into digestate and filtrate and a controller that controls operation of the filtering system. The filter comprising a filter head located in the first tank at a height-adjustable position. <Figure 1>

The application discloses a marine-source collagen fiber hemostatic sponge and a preparation method thereof, and belongs to the field of biomedical materials. The preparation method is as follows: a true sea moss is cut open, a bag is removed, internal tissues are taken out, and digests, excrements and the like are removed after washing; the internal tissues are cut into pieces and then added into a NaCl solution, and are placed at 0-4 DEG C for 6-18 hours; urea solution is added after filtration and cleaning; a high-speed homogenizer is used for primary stirring to obtain a collagen-urea blend solution, and the solution is frozen and then thawed at 4 DEG C for 5-15 minutes; a high-speed homogenizer is used for secondary stirring; and finally, a vacuum filter press is used for solid-liquid separation of the solution to obtain collagen fibers; the collagen fibers are dispersed in water, and freeze-drying is carried out to obtain the collagen fiber hemostatic sponge. The application provides a porous hemostatic sponge with a capillary rapid liquid absorption capacity, which has the advantages of rapid preparation, low economic cost, ecological friendliness in a whole life cycle, strong liquid absorption, good hemostatic effect and low hemolysis rate.

A plant and a method for treating organic waste are provided. The plant and method provide an integrated system for waste treatment which allows optimization of the re-use of treated organic waste, by recovering and exploiting all the components of the incoming waste. After a series of pretreatment operations intended to separate the organic fraction from ferrous, plastic and inert materials, the treated waste is subjected at first to an anaerobic treatment with production of biogas and digestate, and the digestate is then subjected to an aerobic treatment with production of compost. Advantageously, the plant and method provide that handling of the waste to be treated takes place in an automated manner, thus reducing personnel exposure to bad odors and contaminants.

The invention discloses a method for extracting fish oil from viscera of freshwater fish, which comprises the following steps: removing gall bladder, swim bladder and intestinal digests in the viscera of freshwater fish, cleaning, draining, and crushing to obtain viscera paste; putting the minced viscera into deionized water, carrying out microwave treatment, then adjusting the pH value to 6.5-7.5, and then adding neutral protease and an antioxidant to carry out enzymolysis reaction, so as to obtain an enzymolysis mixture; and performing centrifugal layering on the enzymolysis mixture, collecting a fish oil layer, and performing distillation purification to obtain the fish oil. According to the extraction method disclosed by the invention, a microwave-assisted enzymolysis technology is adopted to accelerate a reaction process, an oil-soluble natural antioxidant in-situ antioxidant technology is combined to inhibit fat oxidation, and the fish oil is purified by a molecular distillation technology, so that the product quality is improved; the technology can improve the fish oil extraction efficiency, reduce the production cost, reduce the environmental pollution, and ensure the high quality and high purity of the fish oil.

An anaerobic digester including an active heat pump system. The active heat pump system is arranged to absorb thermal energy from effluent of the digester and return at least a portion of that thermal energy to one or more of the influent, the digestate recirculation, and fluid within the tank. In an embodiment, the active heat pump system includes a heat pump for the influent and / or the recirculating digestate. In another embodiment, the active heat pump system includes an exchanger within the digester tank to transfer thermal energy to the fluid within the tank. Each heat pump is configured to absorb thermal energy of the effluent and to transfer thermal energy to the influent, the digestate, and / or the fluid within the digester. The active heat pump system may include the influent heat pump, the recirculating digestate heat pump and / or the tank fluid heat pump.

The application discloses a kind of closed field leachate and kitchen garbage combined anaerobic digestion device and method, device includes sequentially and side by side and is connected and is arranged pretreatment bin, preliminary mixing bin and anaerobic digestion bin, preliminary mixing bin middle part is equipped with a for receiving the mixed component of solid kitchen garbage on the filter plate.S1, kitchen garbage pretreatment;S2, kitchen garbage humification treatment;S3, combined anaerobic digestion treatment;S4, gas collection.The application is by closed field leachate as inoculum, kitchen garbage is digestion material, carries out sequential batch combined anaerobic digestion treatment, so that closed field leachate has good inoculation function, under the condition that no any inoculum is added, combined anaerobic digestion system can quickly enter gas production peak period finally by kitchen garbage conversion formed humus is substantially completely degraded.

The application provides a kind of anaerobic digestion residue dewatering performance rapid detection method, belong to the technical field of biomass waste dewatering performance detection.Specifically: collect anaerobic digestion in 400-4000cm ‑1 Wavelength range of full-band infrared spectrum data;Using infrared spectrum analysis software to obtain the infrared spectrum data is smoothed;According to the data obtained, select 1550-1750cm ‑1 Wavelength range of infrared water spectrum data related to O-H bending vibration, Gaussian deconvolution and peak fitting are carried out using peak fitting software, and are decomposed into six sub-peaks, p1-p6;And calculate the area ratio of each sub-peak, and the ratio of the area ratio of sub-peak 1-2 and sub-peak 3-6 is represented by the sum of the area ratio of sub-peak 1-2 and sub-peak 3-6, and the value is higher, which means it is more difficult to dewater.The infrared detection method of the application has the advantages of clean, efficient, low dose, low cost, batch detection, etc.

This invention discloses a technical method for alleviating ammonia inhibition during the high-temperature aerobic digestion process of organic solid waste. The method involves reacting fulvic acid with a mixture mainly containing Cu... 2+ Mn 2+ Fe 2+ The enzyme-catalyzed solutions of ions were mixed to prepare a conditioning mother liquor, which was then added to the high-temperature aerobic digestion system for organic solid waste in a specific ratio. The total ammonia nitrogen concentration in the digestate was monitored, and when it rose to 800 mg / L... ‑1 In this process, soluble magnesium salts and phosphogypsum slurry are sequentially added to the treatment system of wet organic solid waste. Heavy magnesium oxide is intermittently added to adjust the pH of the digestion system to 8.0-9.0, and high-temperature aerobic digestion is continued. Then, a silicate nitrogen-fixing agent is added to the digestion system. This invention combines the principles of enhancing oxidase activity with ammonia nitrogen precipitation, adsorption, and ion exchange to alleviate ammonia inhibition during the high-temperature aerobic digestion of wet organic solid waste through multiple pathways. After stabilization treatment, the solid residue obtained from solid-liquid separation has a high degree of humification and nitrogen content, making it suitable for subsequent substrate utilization.

The invention relates to an anaerobic digestion plant comprising a digester for transforming biomass into biogas and into a digestate comprising solid matter and seepage liquid, the digester comprising an outlet to the outside, the plant comprising a conveying system (44) for discharging digestate through the outlet, the conveying system comprising a drawer (200) having a bottom and side edges, and a scraper element configured to move back and forth in a direction of horizontal translation toward the outlet (40) between a filling position and an emptying position, the scraper element (204) comprising a nose (210) configured to push the digestate toward the outlet (40) via a first surface in a first direction of translation outward from the digester, and to slide under the digestate via a second surface in an inward direction of translation.

The present invention belongs to the technical field of solid waste treatment and provides a method for preparing hydrogen-rich low-carbon syngas by chemical looping gasification of high-moisture digestate. In the present invention, high-moisture digestate is mixed with an oxygen carrier to carry out a chemical looping gasification reaction to obtain hydrogen-rich low-carbon syngas. The moisture content of the high-moisture digestate is 30-50%. The oxygen carrier is a transition-metal-supported lanthanum oxide. In the present invention, a metal-composite-type water–carbon-capturing oxygen carrier material, i.e., the transition-metal-supported lanthanum oxide, is used to carry out chemical looping gasification conversion of high-moisture digestate, which improves the moisture tolerance of digestate chemical looping gasification, optimizes the quality of syngas, and increases the content of hydrogen and reduces the content of CO2 in the syngas.

To provide a hydrogen supply device for a methane gas fermentation tank capable of safely and easily eliminating clogging SOLUTION: In a biomethanation reaction for converting carbon dioxide (CO2) contained in a biogas into methane (CH4) by adding hydrogen into a digestive liquid of a methane fermentation tank, a hydrogen gas feeder 11 is inserted and arranged through an insertion part 7 provided in the methane fermentation tank 1. The hydrogen gas supply device includes a first tube part configured such that a distal end region thereof is positioned in the digestive juice W, and a second tube part disposed in the first tube part so as to be capable of being inserted into and pulled out from the first tube part and having a length capable of protruding from a distal end open region of the first tube part, and the second tube part has a hydrogen gas blowing region communicating with the inside of the tube in a protruding region protruding from the distal end open region of the first tube part.SELECTED DRAWING: Figure 2

This invention provides a method for preparing nutrient solutions in hydroponics that improves the productivity of hydroponic systems using raw material digestate. [Solution] The method for preparing the nutrient solution for hydroponics is a method for preparing the nutrient solution 111 using digestate, characterized by mixing an alkaline agent 131 with the nutrient solution 111 supplied to plant A to adjust the pH of the nutrient solution 111 to 6.0 or higher and 6.9 or lower (generating a prepared nutrient solution 121). Alternatively, the method for preparing the nutrient solution for hydroponics may involve mixing a prepared digestate with the nutrient solution 111 supplied to plant A to adjust the pH of the nutrient solution 111 to 6.0 or higher and 6.3 or lower.

An anaerobic biogas plant comprising a digester and a method for the digestion of fresh organic digestion substrate. The digester includes an entry section with an inlet at a first end, a rear section at a second, opposite end, and a middle section arranged between the entry section and the rear section. The digester further includes a stirring unit comprising a shaft extending in the direction from the first end to the second end and having at least one agitating arm for mixing the substrate within the digester. The middle section includes a main outlet and the rear section includes an additional outlet. The digester further includes a separate return line leading from the additional outlet back to the entry section of the digester for allowing a direct return of a minor fraction of digestate removed from the rear section back into the entry section.

Method for producing biogas from a fibrous substrate comprising biological pretreatment by solid-state fermentation using one or more filamentous fungal strains, more particularly using one or more saprophytic filamentous strains, a woven, non-woven, or agglomerated, and shredded fibrous substrate, biogas production from the pretreated fibrous substrate with formation of a digestate, and digestate collection.

The disclosure relates to processes of combining algae and waste feedstocks comprising digestate or food waste for the production of bio-oil via hydrothermal liquefaction. The disclosure further relates to bio-oil and sustainable fuels such as sustainable aviation fuel derived from said processes, as well as systems for producing bio-oil.

The invention relates to a method for the treatment of aqueous digestate produced during the anaerobic fermentation of biomass.

A liquid animal digest (LAD) can include hydrolyzed animal tissue, antioxidant, and from about 0.1 wt % to about 5 wt % dairy fat based on a total weight of the LAD.

A method for calculating (1) an operating parameter of a digester adapted to produce digestate and biogas containing methane, said method comprising the following steps: - A step of defining (2) a concentration range for an input to the digester and a temperature range for the operation; - A preliminary estimation step (3) of an intermediate concentration; - A determination step (4) of the pH within the digester; - A estimation step (5) of a concentration of at least one inhibitory compound present within the digester; - A identification step (6) of one or more microorganisms with limiting kinetics present in the digester; - A prediction step (7) of the maximum growth rate of the microorganism(s) identified; - A identification step (8) of the maximum permissible load in the digester;and - A calculation step (9) of said digester operating parameter as a function of the maximum permissible load identified. Figure of the abstract: Figure 1;

Method for separating water from end-fermented biomass, for example from digestate from biogas processes, in which acetic acid is added to the biomass for foaming and iron sulfate for flocculation, and in which the foamed and flocculated biomass is arranged on a sieve device or is arranged for separating water to form a treated digestate.

The present invention relates to a method for use in a biogas plant having at least one digester (12) and a thermal treatment unit (50), the method comprising the steps of : a ) anaerobically digesting an organic biomass (18) in at least one digester (12) through microorganisms at a temperature below 50 ° C to produce methane-containing biogas (16) and a digestate (14); b) removing a major fraction (32) of the digestate (14) from the digestion process after a fast retention time t and subjecting at least part of said major digestate fraction (32) to a thermal treatment in a thermal treatment unit (50) at a temperature above 175 ° C for at least one minute, wherein the thermal treatment step involves at least one treatment selected from the group consisting of pyrolysis, torrefaction, gasification, hydrothermal gasification, hydrothermal carbonization and hydrothermal liquefaction; and c ) retrieving a minor fraction (34) of the digestate (14) from the digestion process after an inoculum retention time T that is longer than the fast retention time t, returning said minor digestate fraction (34) into the digestion process and mixing the minor digestate fraction with the organic biomass (18) within the digester (12).

The subject of the application, shown in the drawing, is a flow-through biogas reactor consisting of at least two pipes arranged one above the other and inclined from the horizontal by an angle α, connected by a connector to a biogas outlet and a collector with a valve for removing heavy fractions of the fermenting mixture. The reactor is equipped with fittings in the form of a valve, pumps, and a static mixer enabling effective mixing of the substrate with the digestate. The reactor pipes are equipped with Archimedean ribbons mounted on rotating shafts to transport heavy fractions of the fermenting mixture along the reactor pipes and, consequently, to discharge them to the outside through a valve.

The object of the present invention is to provide a method for producing liquid fertilizer using digestate as a raw material, which can efficiently separate both nitrogen and water while adjusting the nitrogen content of the resulting concentrated liquid to a desired value, and a system that can be used to carry out this method. [Solution] The above objective can be achieved by a method for producing liquid fertilizer, which includes an ammonia separation step, a water separation step, and a mixing step, wherein the ammonia separation step is a step of separating ammonia from the digestate to obtain a processed liquid, the water separation step is a step of separating water from the processed liquid to obtain a concentrated liquid, and the mixing step is a step of mixing the ammonia and the concentrated liquid to obtain liquid fertilizer.

A method of treating a wastewater having an ammonia concentration that is toxic to anaerobic bacteria includes introducing the wastewater into an anaerobic biological treatment vessel to produce a digestate, introducing a portion of the digestate into an ammonia removal sub-system to produce an effluent having a lower ammonia concentration than the digestate, diluting the wastewater introduced into the anaerobic biological treatment vessel by introducing a portion of the effluent from the ammonia removal sub-system into the anaerobic biological treatment vessel with the wastewater, and regulating the flow rate of the portion of the effluent from the ammonia removal sub-system to cause the portion of the effluent to be introduced into the anaerobic biological treatment vessel in an amount sufficient to form an anaerobic biological treatment vessel influent having an ammonia concentration lower than an ammonia concentration that is toxic to anaerobic bacteria in the anaerobic biological treatment vessel.

The invention relates to the technical field of agricultural waste treatment and utilization, and discloses an iron-lanthanum / eggshell-bentonite composite material as well as a preparation method and application thereof. Comprising the following steps: mixing eggshells, bentonite, chitosan, soluble starch and water to obtain slurry; iron salt, lanthanum salt and the slurry are mixed, then aging and calcination are conducted, the eggshell and bentonite serve as carriers, iron ions and lanthanum ions are deposited on the surfaces, pores and interlayers of the carriers to form metal oxides, and the iron-lanthanum / eggshell-bentonite composite material is obtained. The composite material can improve the anaerobic fermentation gas production potential, reduce harmful substances in the fermentation process, improve the agronomic value of digests, and solve the problems of low kinetic activity, easy accumulation of inhibitory metabolites such as ammonia and the like in the anaerobic fermentation process.

The present invention features general-purpose microbiological growth media capable of supporting growth of microorganisms on membranes. The media contain casein digest, soybean digest, animal tissue digest, yeast extract, dextrose, a phosphate buffer, hemin, and L-cystine. The invention features an all-purpose microbiological growth media that can support the growth of anaerobes, molds, injured spores, and general aerobic bacteria to a greater extent than other media.

The invention relates to a method for treating waste containing biodegradable organic matter. Said method comprises a step a) of separating the solid impurities from said waste within a chamber followed by a step b) of anaerobic digestion of the purified waste separated in step a) during which biogas and a digestate containing dissolved CO2 are produced. The separation step a) comprises: a1) a flotation step during which part of the digestate from step b) is brought into contact with said waste within the chamber under pH conditions sufficient to generate CO2 bubbles, at least part of the solid impurities being transported by the CO2 bubbles toward the surface of said mixture and forming a floating phase, and a2) separation of a floating phase.