Anaerobic fermentation technique for combined treatment of dejection and straw

Abstract

The invention relates to an anaerobic fermentation technique for combinely processing feces and straws. The method comprises doing pile treatment to feces, and then mixing with disintegrated straws, adjusting water-content coefficient to 60%-70% to be used as bait of earthworms cultivation, through wormcast which is produced after earthworms eat bait into a methane tank to do methane tank to produce marsh gas. The invention solves the technical difficult problems of layered raw material, incrusted floating upward, difficult discharging, bad gas production effect and the like which are caused by directly utilizing straws to be marsh gas fermentation material and restricts straws to be household methane tank fermentation material for a long term, and meanwhile, wormcast which is used as marsh gas fermentation material has the functions of improving raw material gas production rate, improving anaerobic sludge activity and strengthening the stability of anaerobic fermentation process, and earthworm production improves economic output of handling process.

Description

technical field [0001] The invention belongs to the field of renewable energy development and utilization and environmental protection, and in particular relates to an anaerobic fermentation process for jointly treating manure and straw. Background technique [0002] Wastes discharged from agricultural production and rural life have become one of the main sources of pollution causing eutrophication of water bodies in my country. According to the data provided in the "Tenth Five-Year Plan for Water Pollution Prevention and Control in Taihu Lake", the contribution rate of agricultural pollution to the main pollutant ammonia nitrogen in the Taihu Lake Basin exceeds 50%. Every year, 320,000 tons of solid waste flows into Dianchi Lake, including 240,000 tons of human and livestock waste. These wastes contain 426.6 tons of total phosphorus and 1167 tons of total nitrogen. Another example is that the pollution in Hangzhou Bay now mainly comes from the vast rural areas in the Yang...

AI Technical Summary

Problems solved by technology

[0009] With the support of national policies, household biogas technology has developed rapidly in my country, but as far as the current development situation is concerned, a major problem is that the raw materials used are too single, that is, livestock and poultry manure is mainly used as fermentation raw materials

Straw raw materials are considered unsuitable as fermentation raw materials for household biogas digesters due to problems such as raw material stratification, crusting, and difficulty in discharging during anaerobic fermentation.

However, in many rural areas where the economy is relatively developed in our country, the traditional farming model, that is, the way of raising livestock in one household has been basically eliminated, which limits the application of this technology in these areas to a large extent. On the other hand, , due to the increasing demand for clean fuels, the pressure on commodity energy supply in these areas is also increasing, and the rising commodity energy prices have also increased the burden on farmers in this regard

At the same time, a large amount of straw resources in these areas are discarded every year, which not only pollutes the environment, but also causes a lot of waste of resources.

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