Treatment system and method for electroplating sludge hydrothermal oxidation coupling oxygen-controlled calcination and solidification of heavy metal

Abstract

The invention discloses a system and a method for solidifying heavy metals by coupling hydrothermal oxidation and oxygen control calcination of electroplating sludge, the system comprises a sludge conditioning tank, a hydrothermal reaction kettle, a mechanical plate-and-frame filter press, a waste heat dryer and an oxygen control calcining furnace which are connected in sequence, and the electroplating sludge and an oxidant diluent are uniformly stirred through the sludge conditioning tank; the electroplating sludge enters a hydrothermal reaction kettle for hydrothermal oxidation reaction, the treatment process can improve the dewatering property of the electroplating sludge and promote the stability of heavy metals, then the electroplating sludge enters a mechanical plate-and-frame filter press for preliminary dewatering, then industrial waste heat is utilized for deep drying, dried solids are fed into an oxygen-controlled calcining furnace for heat treatment, and solid residues are obtained. According to the treatment method, the heavy metals of the raw materials are stabilized while the dewatering of the electroplating sludge is promoted and the reduction treatment of the sludge is realized, so that the leaching toxicity and the bioavailability of the heavy metals are reduced, and the environmental ecological risk of the electroplating sludge is greatly reduced.

Description

technical field [0001] The invention belongs to the field of industrial waste treatment and solid waste harmless disposal, and particularly relates to a treatment system and method of electroplating sludge hydrothermal oxidation coupled with oxygen-controlled calcination to solidify heavy metals. Background technique [0002] With the wide use of metal raw materials, the electroplating industry has become a rapidly developing industry in my country, accounting for a large proportion in the surface treatment industry. With the large-scale development of the electroplating industry, the amount of electroplating wastewater is increasing. Electroplating sludge is the sediment produced in the process of electroplating wastewater treatment. It contains a large amount of heavy metals, pathogenic microorganisms and organic pollutants. It has strong toxicity and corrosiveness. Hazardous Waste. Heavy metals are non-biodegradable and easy to bioaccumulate. When they enter the soil, t...

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