Sludge resource utilization system and method

Abstract

The invention relates to a sludge resource utilization system and method. Surplus calcium oxide is used as agents of a whole sludge treatment process. The system and method have the advantages of being harmless and stable in sludge processing, reduction is achieved, reutilization is achieved, desulfurizing agent consumption is small, and the reutilization rate is high. According to the technical scheme, the system comprises a preprocessor for sludge organic matter decomposing, an outlet of the preprocessor is communicated with an anaerobic fermentation tank, a methane outlet of the anaerobic fermentation tank is connected with a methane tank, a sludge outlet of the anaerobic fermentation tank is connected with a dehydrator and a dryer in sequence, a sludge outlet of the dryer and an inlet of an incinerator are communicated, a smoke outlet of the incinerator is connected with a dust collector, a flying ash outlet of the dust collector is divided into two ways which are connected with a flying ash inlet of the preprocessor and an ash storeroom respectively, an outlet of the methane tank is communicated with an electricity generating fuel machine, a smoke outlet of the fuel machine is connected with a waste heat boiler, and the incinerator and the waste heat boiler provide heat for the dryer through heat supplying pipes.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge resource utilization system and method. Background technique [0002] (1) Sludge production and its hazards [0003] With the rapid advancement of urbanization, China's sewage treatment industry has developed rapidly, the sewage treatment capacity and treatment rate have increased rapidly, and the output of sewage sludge has increased rapidly. By the end of 2010, the treatment capacity of China's urban domestic sewage facilities had reached 125 million cubic meters per day, the sewage treatment rate of cities with cities had reached 77.5%, and the contribution rate of chemical oxygen demand (COD) pollution emission reduction accounted for the most in China's "Eleventh Five-Year Plan" During this period, more than 70% of the total national COD reduction was added. With the rapid increase of sewage treatment volume, China's sludge production has also increased sharply, an...

AI Technical Summary

Problems solved by technology

However, sludge incineration treatment needs to consume high-quality energy such as coal, and the cost of fuel is relatively high.

In addition, wet sludge contains a lot of water, which enters into the flue gas after incineration, and the amount of flue gas generated by direct incineration is large, and the purification treatment cost of a large amount of flue gas is high

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