Method for recovering coagulant from aluminium containing mud

Abstract

The present invention relates to method of recovering coagulant from aluminum-containing mud and features that after aluminum-containing mud is set inside reactor, concentrated sulfuric acid is added while controlling pH value in 3-5 to obtain through reaction the mixture of mud, aluminum salt solution, etc. and the mixture is solid-liquid separated to obtain coagulant liquid. The coagulant is used for processing sewage in the next time, and solid mud is denatured and deposited to reduce volume and water content for easy burning treatment.

Description

technical field [0001] The invention relates to a method for recovering a coagulant from aluminum-containing sludge in a sewage treatment process. Background technique [0002] In the prior art, urban sewage and dyed sewage are affected by various factors, and the organic matter degraded through anaerobic-aerobic biochemical treatment accounts for about 50%. Such as aluminum chloride, aluminum sulfate, basic aluminum chloride, basic aluminum sulfate) as a coagulant, the finely dispersed sol particles in the sewage are coagulated with the help of the hydrolyzate of the aluminum salt, and the final product of the hydrolysis of the aluminum salt is insoluble The presence of aluminum hydroxide precipitates generates tiny flocs, which can adsorb and bond colloidal impurities, and sweep them out of the water together. The separated object is called aluminum-containing sludge, and its amount is about 5% of the amount of sewage to be treated. Adding polyac...

AI Technical Summary

Problems solved by technology

The aluminum hydroxide in the sludge is discarded together, and polyacrylamide is also added, which increases the cost of treatment