System for recycling sludge subjected to chemical drying

Abstract

The invention utilizes a recycling technology performing drying treatment of raw sludge by using sludge subjected to chemical drying treatment. By recycling treated sludge, the raw sludge can be evenly and well mixed with a composite reagent in the treatment process, and good effect is played on moisture removal. The treatment process comprises the steps of 1 using chemical drying to treat the sludge and fully mixing the sludge and the composite reagent; 2 performing air-curing and smashing; enabling the moisture content to be reduced to be 30-40% after the sludge subjected to chemical drying is dried naturally, using a sludge smashing device to smash sludge cakes into 0.5-1mm of powder-like particles, and smashing the sludge particles to be approximate to power after further drying; and 3 performing circulating input, mixing power obtained through the drying and smashing and an early-added reagent in the composite reagent, further adding other reagents in the composite reagent and then performing the circular process. The system for recycling the sludge subjected to chemical drying takes the sludge treatment cost and treatment effect as main factors and reduces secondary environment pollution.

Description

technical field [0001] The invention relates to a research and development technology for sludge recycling after chemical drying of sludge. The sludge is reused, so as to reduce the use of compound chemicals in the sludge treatment process, thereby reducing the cost in the sludge treatment process. Background technique [0002] According to statistics, the sewage treatment plants currently in operation nationwide will produce 45 million tons of sludge with a moisture content of about 80% every year. The sewage treatment plants focus on the sewage treatment process, and the sludge treatment process is relatively simple. Most sewage treatment plants The sludge is only subjected to physical processes such as centrifugal dehydration. Some sewage treatment plants do not take corresponding treatment methods for different pollutants in the sludge by adding a large amount of lime. The sludge from the sewage treatment plant is still harmful to the environment. There is a risk of sec...

AI Technical Summary

Problems solved by technology

[0002] According to statistics, the sewage treatment plants currently in operation and put into production in the country will produce 45 million tons of sludge with a moisture content of about 80% every year. The sewage treatment plants focus on the sewage treatment process. The sludge treatment process is relatively simple. Most sewage treatment plants The sludge is only subjected to physical processes such as centrifugal dehydration. Some sewage treatment plants add a large amount of lime, but do not make corresponding treatment methods for different pollutants in the sludge. The sludge coming out of the sewage treatment plant is still harmful to the environment. There is a risk of secondary pollution

[0003] At present, through research and comparison, the chemical drying method has better social and economic benefits in the process of sludge treatment, but the problem of the cost of adding chemical reagents has not been resolved. As the requirements for sludge treatment become more and more stringent, how to reduce The cost of drug administration has become a key issue that needs to be solved