Anaerobic digestion system capable of improving biogas production efficiency

Abstract

The invention belongs to the technical field of biological fermentation, and discloses an anaerobic digestion system capable of improving biogas production efficiency. The anaerobic digestion system comprises an anaerobic digester, a biogas pressure regulating tank, an anaerobic membrane separator and a solid-liquid separator, wherein the anaerobic digester communicates with a feed pipe, a digester flexible gas storage bag, a discharge pipe, a material distribution pipe and a slag discharge pipe, the digester flexible gas storage bag communicates with a digester exhaust pipe, the biogas pressure regulating tank communicates with a biogas discharge pipe and a biogas backwashing pipe, the solid-liquid separator communicates with a biogas residue pipe, a biogas slurry pipe and a coagulant adding tank, the anaerobic membrane separator communicates with a membrane separator flexible gas storage bag, an overflow pipe, a sludge return pipe, a membrane assembly and a side stirrer, and the membrane assembly communicates with a water outlet pipe. The system of the invention overcomes the problems that digestion treatment on organic materials is incomplete, efficiency is low, operation energy consumption is high, and sulfur components in biogas are not treated independently in the prior art, and is suitable for anaerobic digestion of agricultural waste organic materials to produce biogas.

Description

technical field [0001] The invention relates to the technical field of biological fermentation, in particular to an anaerobic digestion system for improving the efficiency of biogas production. Background technique [0002] Agriculture is an important source of greenhouse gas emissions. In 2014, my country's agricultural emissions were 830 million tons, accounting for about 7% of the country's total emissions. Accounting for about 15% of the country's greenhouse gas emissions, promoting the reduction of emissions in the agricultural and rural areas will play an important role in my country's peak carbon neutrality on schedule and make positive contributions to the global response to climate change. Among them, reducing emissions and sequestering carbon in the agricultural and rural areas is not only an important measure for carbon peak carbon neutrality, but also the potential. my country is a large agricultural country, which produces a large amount of agricultural and rural...

AI Technical Summary

Problems solved by technology

[0005] 1. When the feed liquid is discharged, it will not only cause a large loss of active anaerobic microorganisms and reduce the processing efficiency of the digester, but also produce biogas from unfermented materials, which is both waste and pollution;

[0006] 2. Since the sulfur components in the biogas are not treated separately, it is easy to cause damage to generator equipment and corrosion of pipelines;

[0007] 3. The fermentation residue is separated into biogas slurry and biogas residue after being treated by a solid-liquid separator. The high moisture content of biogas residue is an important factor that limits its subsequent treatment and utilization. However, the dehydration performance of existing mechanical equipment is poor, and the discharged High moisture content of biogas residue;

[0008] 4. The single input and output materials make the material concentration in the anaerobic reactor relatively low, generally lower than 6%, and the processing capacity is limited. If the concentration is increased, it will easily lead to difficulty in mass transfer in the system, forming scum and sediment, negatively affect the function and performance of the anaerobic reactor;

[0009] 5. It is very difficult to achieve complete mixing in the existing large and super-large anaerobic reactors. Using one or more mechanical agitators not only has high investment and construction costs, but also high energy consumption in operation and difficult maintenance, which reduces project benefits

Images