Composite sludge curing agent

Abstract

The invention relates to the field of sludge treatment, in particular to a composite sludge curing agent. The composite sludge curing agent is prepared from the following raw materials in parts by weight: 30-40 parts of fly ash, 15-20 parts of citric acid residue, 11-13 parts of calcium bentonite, 58 parts of cement, 0.5-0.8 part of carbide slag, 0.3-0.5 part of a polycarboxylate superplasticizer and 0.12-0.15 part of a heavy metal chelating agent. The composite sludge curing agent provided by the invention not only can improve the strength of sludge, but also can effectively absorb water in the sludge in a short time, and has a better heavy metal adsorption effect, the sludge treated by the composite sludge curing agent can be used on a road bed, the road building cost is reduced, meanwhile, the composite sludge curing agent is relatively environment-friendly, and secondary pollution of the sludge is effectively prevented; the fly ash, the citric acid residues and other wastes are used as main raw materials, the doping amount is small during sludge consolidation treatment, the cost is low, and large-scale popularization is facilitated.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a composite sludge solidifying agent. Background technique [0002] There are many rivers distributed in our country. In order to make the rivers run smoothly, the rivers need to be dredged frequently, which will clean up a lot of silt. It is estimated that the silt cleaned out in the Pearl River Delta region alone exceeds 8x10 7 m 3 . The large amount of silt cleaned out has high moisture content, low strength, and a large amount of heavy metals. It cannot be directly used as engineering filler. It needs to be requisitioned for storage or dumped, resulting in problems such as occupying cultivated land and affecting the environment. [0003] With the increasing awareness of environmental protection in the whole society, a large amount of silt has been solidified to make its engineering properties meet the requirements of roadbed fillers. Although traditional silt curing agents (...

AI Technical Summary

Problems solved by technology

The large amount of silt cleaned out has high moisture content, low strength, and a large amount of heavy metals, so it cannot be directly used as engineering filler. It needs to be requisitioned for storage or dumping, resulting in problems such as occupying cultivated land and affecting the environment.

[0003] With the increasing awareness of environmental protection in the whole society, a large amount of silt has been solidified to make its engineering properties meet the requirements of roadbed fillers. Although traditional silt curing agents (such as lime, cement, fly ash, etc.) have certain improvements in strength, But the curing time is long, the water absorption effect is poor in a short period of time, and the adsorption of heavy metals is poor, which is easy to cause secondary pollution

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