Sludge conditioning agent, application thereof and method for conditioning sludge

Abstract

The invention provides a sludge conditioning agent, an application thereof and a method for conditioning sludge. The sludge conditioning agent comprises a geopolymer and other conditioning additives. On one hand, the addition of the geopolymer remarkably improves a flocculation reaction of the sludge conditioning agent on the colloidal particles in the sludge conditioning process and improves the sludge dewatering effect, and on the other hand, toxic substances such as metal ions can also be surrounded in a cavity between the geopolymer molecules, so that a detoxification effect is achieved; meanwhile, the geopolymer can remarkably reduce the use of ferric chloride, quicklime and the like, so that the cost can be reduced, the corrosion of the ferric chloride on a pipeline in the mechanical dehydration process and the blockage of the quicklime on the pipeline and a filter cloth can be reduced.

Description

technical field [0001] The invention relates to the field of sludge conditioning, in particular to a sludge conditioning agent, its application and a method for conditioning sludge. Background technique [0002] With the continuous acceleration of my country's urbanization process and the continuous improvement of people's living standards, the discharge of industrial wastewater and domestic sewage has increased year by year, followed by a rapid increase in sludge production in the process of sewage treatment. Statistics show that the annual sludge produced in our country will be more than 30 million tons in terms of absolute dry sludge. [0003] Sludge is a viscous substance produced in the process of sewage treatment, which contains a large amount of organic matter, heavy metals, pathogenic microorganisms, etc. The microorganisms in it are mainly aerobic and anaerobic microorganisms, with high organic matter content, and water body It is a typical solid waste due to its c...

AI Technical Summary

Problems solved by technology

Such a high chemical usage cost hinders the popularization and application of mechanical dehydration process

At the same time, ferric chloride is more corrosive to subsequent mechanical dehydration equipment, and the dosage of chemicals is large, resulting in high chloride ion content in the filtrate, which increases the difficulty of sludge filtrate treatment in the later stage; the addition of industrial grade lime is easy to increase The load handled by the equipment is easy to cause blockage of pipes and filter cloth

However, organic polymer conditioners such as polyacrylamide act on the interstitial water of sludge, which has little effect on the deep dehydration of sludge, and the improvement effect is relatively limited. The moisture content of sludge is usually greater than 80%, which cannot meet the requirements of the Ministry of Housing and Urban-Rural Development for sludge treatment. Require

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