System for continually mixing, modifying and pelletizing dewatered sludge

Abstract

The invention discloses a system for continually mixing, modifying and pelletizing dewatered sludge, belonging to environment-friendly equipment. According to the pelletizing system, a screw rod metering material adding way and a continuous stirrer mixing way are adopted, so that uniform mixing of sludge and a curing agent material is facilitated, sludge particles are fully contacted and reacted with the curing agent material, and continuous working capability is achieved; a sludge storage bin, a stirrer, strengthening equipment and a dedusting tower pipeline are connected to a gas purifying device, so that dust and odor of a working field are reduced, and secondary pollution is avoided; the mineralization reaction rate of a curing agent and moisture dissipation speed are accelerated whenthe strengthening equipment is adopted for treating a sludge-curing agent mixture; and a pelletizing machine is adopted, so that the size of a sludge solidified block is reduced, the moisture dissipation surface area and the sludge particle oxidation surface area are increased, and the drying time of sludge is shortened. The treated sludge has the advantages of low water content, low odor, immobilization, certain shearing resistance and certain internal friction angle, and can meet the requirement of a roadbed backfill and the requirement of filling on a sanitary landfill yard.

Description

technical field [0001] The invention discloses a continuous uniform mixing modified granulation system for dewatered sludge, which belongs to the category of environmental protection equipment. Background technique [0002] With the gradual acceleration of the construction of urban sewage treatment facilities and the increasing rate of centralized sewage treatment, the amount of sludge produced by sewage treatment plants has increased dramatically. According to relevant predictions, the amount of urban sewage in my country will increase substantially in the next 20 years. In 2010, the sewage discharge will reach 440×108m3 / d; in 2020, the sewage discharge will reach 536×108m3 / d; 0.3%-0.5% (volume) of the amount of sewage or about 1%-2% (mass) of the amount of sewage treatment. Moreover, if the sewage is further treated, the amount of sludge will increase by 0.5 to 1 times. At present, my country's sewage treatment capacity and treatment rate are not high (4.5%), and urban se...

AI Technical Summary

Problems solved by technology

However, at present, domestic sludge granulation and landfill treatment is still in a blank stage, and there is an unprecedented shortage of special mechanical equipment for sludge granulation, and some existing equipment still faces unstable granulation, low strength, continuous Low work rate and other difficulties

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