An anaerobic digestion device for livestock and poultry manure driven by negative pressure for internal circulation of digestive fluid
A technology for anaerobic digestion and livestock and poultry manure, which is applied to biological sludge treatment, waste fuel, etc., can solve problems such as unstable digestion process, difficulty in feeding and discharging materials, and poor mass transfer performance, so as to ensure efficient and stable operation and improve transfer efficiency. Quality, reduce the effect of physical damage
Active Publication Date: 2021-03-23
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problems of poor mass transfer performance, high energy consumption, low methane yield, unstable digestion process and difficulty in feeding and discharging existing livestock and poultry manure solid material anaerobic digestion devices that adopt single-phase batch digestion. Problem, provide an anaerobic digestion device for livestock and poultry manure with negative pressure driving the internal circulation of digestive liquid
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[0008] like figure 1 As shown, the livestock and poultry manure and lignocellulosic solid wastes to be treated are preliminarily pretreated, the agricultural crop straws are crushed to a particle size of about 0.2~0.5mm, and the crushed agricultural crop straws and livestock and poultry manures are divided into 1 The solid phase storage tank (13) is filled into the solid phase storage tank (13) after mixing with a mass ratio of : 2. In order to prevent the overflow of excess leaching and digestion solution, the effective volume of the solid phase storage tank is 70% to 80%. The inoculant (biogas slurry) is calculated according to the filling amount of the digested substrate. , the inoculant and water are injected into the digestion tank (20), and the heating device (18) is regulated by the temperature controller (19) to stabilize the digestion temperature of the liquid phase region in the lower part of the digestion tank to 37±1°C. The filler in the solid-phase storage tank (...
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The invention relates to a negative pressure-driven digestion liquid internal circulating livestock and poultry manure anaerobic digestion device which comprises a three-phase separation and digestion tank and a negative pressure-driven digestion liquid internal circulating system. A gas phase, solid phase and liquid phase in the digestion tank are positioned in the upper, middle and lower layers of a tank body respectively. Digestion liquid in a liquid phase area is driven by the action of negative pressure to flow back to a negative pressure liquid storage device at the top of the tank body through a pipeline, and then is uniformly sprayed to a solid phase area through a liquid distribution device. A soluble organic component generated by hydrolytic acidification of a digestion substrate in the solid phase area flows back to the liquid phase area of an intermediate temperature condition along with the leached digestion liquid to be utilized for efficiently generating methane by a methanogen, and biogas generated by the solid and liquid phases is collected in a gas phase area for use. After a digestion process is ended, left biogas liquid and biogas residues are discharged for cropland application as biogas manure through a liquid outlet and an overturning discharging system respectively. The device aims to solve the problems of poor mass transfer, high energy consumption, low methane yield, instable digestion process and charging and discharging difficulty of a solid waste anaerobic digestion device.
Description
technical field [0001] The invention relates to an anaerobic digestion device for livestock and poultry manure with negative pressure-driven internal circulation of digestive liquid, and belongs to the technical field of solid waste treatment and resource utilization. Background technique [0002] Anaerobic digestion is widely used in the treatment of livestock and poultry manure. The content of organic nitrogen in livestock and poultry manure is high. The excessive concentration of ammonia nitrogen produced in the process of anaerobic digestion may inhibit the activity of methanogenic microorganisms, thereby affecting the performance of anaerobic digestion. Stablize. In order to ensure the stability of the digestion process and high methane yield in the project, the strategy of wet (TS<10%) anaerobic digestion at medium temperature (about 37°C) is usually adopted to avoid the "ammonia inhibition" caused by the high concentration of livestock and poultry manure substrates...
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IPC IPC(8): C02F11/04
CPCC02F11/04Y02E50/30
Inventor 孙德智张立秋闫义龙
Owner BEIJING FORESTRY UNIVERSITY