A complete treatment device and method for low-temperature thermal conditioning and anaerobic biogas production of sludge

Abstract

The invention discloses a set of sludge low temperature thermal conditioning anaerobic methane-generating devices and a method thereof. The set of sludge low temperature thermal conditioning anaerobic methane-generating devices comprises a sludge storage and delivery device, a sludge low temperature thermal conditioning device, a sludge anaerobic digestion device, a heat exchange device, an exhaust-gas treating device, a sludge heat exchange storage device, a mechanical dehydration device, a deodorization device, and a steam boiler. Methane produced from the treated sludge can be used as fuel of the steam boiler or can be sold; obtained sludge cake can be used as landfill soil or other materials; and energy recycling, resource utilization, and reduction of energy consumption and cost can be realized in treating processes of the sludge.

Description

technical field [0001] The invention relates to the field of solid wastes, in particular to a complete treatment device and method for low-temperature thermal conditioning and anaerobic biogas production of sludge. Background technique [0002] In recent years, my country's urban sludge production has increased year by year. By the end of 2010, the sludge produced by my country's sewage treatment plants reached 22 million tons. During the "Twelfth Five-Year Plan" period, my country will build 1,200 new urban sewage treatment plants. It is estimated that by the end of 2015, my country's wet sludge output will reach at least 26 million tons. At present, about 48.28% of the sludge generated in our country is land use, 34.48% is landfilled, 3.45% is incinerated, and 13.79% is not properly disposed of. Most of the sludge has not been properly disposed of, which will bring potential harm to the environment. Using anaerobic digestion to dispose of sludge is a very effective way t...

AI Technical Summary

Problems solved by technology

[0003] The traditional sludge anaerobic digestion process has long residence time (generally 20-30 days for anaerobic digestion process), large facility area, high infrastructure investment and operating costs, high energy consumption and low organic matter removal rate (only 40% left and right) etc.

According to the theory of anaerobic digestion, sludge digestion first needs to overcome the hydrolysis of solid organic matter, but because most of the organic matter in sludge is contained in microbial cells, the hydrolysis rate is slow, which becomes the main limiting factor of sludge digestion rate

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