Conditioning mehtod for sludge dehydration

Abstract

The invention discloses a regulation method for sludge dehydration. Based on the dry weight of the sludge to be treated, the formula of the regulation method contains 10 to 20 percent of iron salt, 10 to 20 percent of burnt lime, 10 to 20 percent of coal gangue and 0.01 to 0.05 percent of potassium permanganate bactericide. The regulation method comprises the following steps of: adding the potassium permanganate bactericide into the sludge to be treated at normal temperature under normal pressure, treating the sludge for at least 2 minutes with stirring, and then adding the iron salt to react for at least 2 minutes; and then adding the burnt lime to adjust the pH value to be neutral, reacting the mixture for at least 2minutes, adding the coal gangue to react for at least 2 minutes, and finally performing pressure filtration. The invention has the advantages of low cost, wide raw material source, no toxicity, environmental friendliness, short treatment time, high sludge dehydration degree and the like.

Description

Technical field [0001] The invention involves the field of environmental engineering and especially involves a sludge treatment method. Background technique [0002] At present, my country's urban sewage treatment plant emits about 1.3 million tons of dry sludge each year, and it is growing at a rate of 10%each year.How to reasonably set the sludge of sewage treatment plants and solve the way out of a large amount of sewage sludge has become an important issue that is related to the safety of human ecological environment. [0003] The sludge discharged by the sewage treatment plant contains a large amount of organic matter, heavy metal ions, parasitic eggs, pathogenic bacteria, etc., which are unstable, generally about 80%.At present, most of the sludge treatment adopts simple treatment methods such as abandonment and landfill.This treatment method not only occupies land resources, but also produces secondary pollution; very few uses dehydrated adjustment agents to treat sludge. ...

AI Technical Summary

Problems solved by technology

This disposal method not only occupies land resources, but also produces secondary pollution; very few use dehydration conditioners to treat sludge, and this treatment process can completely settle pollutants in a short time

However, the cost of these conditioning agents is very high, it is difficult to degrade in nature or the degraded monomers are toxic to the human body, and the dehydration effect is not ideal