Dry manure two-phase anaerobic digestion system for pig farm

Abstract

The invention discloses a dry manure two-phase anaerobic digestion system for a pig farm belonging to the technical field of environment engineering and energy, which uses a hydrolytic acidification and methane production two-phase anaerobic digestion system as a main body. The system is characterized in that the dry manure in the pig farm is treated by integrating aeration biogas slurry reflux, external culture of acid producing bacteria and methane producing bacteria, and activity maintaining device so as to solve the problem that the prior two-phase process cannot effectively treat high solid concentration pig manure and has lower efficiency, thoroughly solve the problem of large water consumption of the conventional anaerobic treatment, realize biogas slurry concentration, reduce the discharge amount of the biogas slurry, greatly reduce subsequent treatment load of biogas engineering, and realize quick degradation and efficient gas production of organic waste. After application, the system improves the comprehensive economic benefit by 20 percent compared with the prior anaerobic system; and the improvement on efficiency ensures that the biogas engineering of the dry manure pig farm realizes self supply of energy, and maintains normal operation of the biogas engineering of the pig farm in winter, thereby achieving multiple aims of saving water, reducing discharge, protecting environment and producing energy and fertilizer.

Description

technical field [0001] The invention belongs to the technical fields of environmental engineering and energy, and in particular relates to a two-phase anaerobic digestion system for dry and clear manure in pig farms. Background technique [0002] Taking anaerobic fermentation technology as the core, taking the pollution control of livestock and poultry manure as the main purpose, and realizing the comprehensive benefits of environmental protection, energy, and resource reuse are the main ways for the current treatment of livestock and poultry manure. [0003] In large-scale farm manure treatment biogas projects, the common anaerobic reactors are mainly the following single-phase reactors: Completely mixed anaerobic reactor, the most mature technology, but the sludge loss is serious, reducing the digester system operating efficiency; the upflow solid reactor has a simple structure and is suitable for high-suspended solid raw materials; the plug-flow digester is a rectangular ...

AI Technical Summary

Problems solved by technology

[0006] However, the existing two-phase anaerobic treatment of solid waste lacks technical integration, and the main problems are as follows: the activity of the bacterial flora decreases in the process of hydrolytic acidification and methanogenesis, and the sludge is aged and lost seriously; Bacterial growth environment weakens the degree of phase separation, leading to a decrease in the efficiency of the entire system

Can not give full play to the advantages of the two-phase process

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