Industrial sludge treatment method

Abstract

The invention discloses an industrial sludge treatment method. The method comprises the following steps: (1) adding step: adding at least one of concentrated sulfuric acid, fuming sulfuric acid or phosphoric acid to the industrial sludge to form a sludge mixture; (2) mixing step: sufficiently mixing the sludge mixture in step (1); (3) ageing step: ageing the sludge mixture treated in step (2), and enabling the sludge mixture to fully react to convert the water in the sludge mixture into free water; (4) dewatering step: dewatering the sludge mixture treated in step (3) to separate the free water from the industrial sludge; and (5) drying step: drying the sludge mixture treated in step (4). The invention has the beneficial effects of achieving the purpose of separating the industrial sludge and the water, greatly reducing the moisture of the industrial sludge, decreasing the volume and the mass of the industrial sludge, and facilitating the subsequent treatment and utilization of the industrial sludge.

Description

technical field [0001] The invention relates to a treatment method for industrial sludge, in particular to a treatment process for surface treatment sludge. Background technique [0002] The industrial sludge includes residues, residues, and sludge generated during phosphating, polishing, and chemical polishing of metal and plastic surfaces. It is included in the national list of hazardous wastes and belongs to the seventeenth category of hazardous wastes. Because industrial sludge contains a large amount of toxic and harmful substances, and each enterprise is unable to dispose of it independently, there are serious environmental safety hazards, which can easily cause secondary pollution to the environment and endanger human health. At present, most of the sludge generated by enterprises is temporarily piled up in the factory area, or mixed with other solid wastes, dumped or landfilled, or illegally collected by unqualified individuals and units. The surface treatment sludge...

AI Technical Summary

Problems solved by technology

Since industrial sludge contains a large amount of toxic and harmful substances, and each enterprise is unable to dispose of it independently, there are serious environmental safety hazards, which can easily cause secondary pollution to the environment and endanger human health.

At present, most of the sludge generated by enterprises is temporarily piled up in the factory area, or mixed with other solid wastes, dumped or landfilled, or illegally collected by unqualified individuals and units. The surface treatment sludge cannot be effectively treated, causing great damage to the environment. destroy

[0003] There is about 80% to 85% water in industrial sludge. Under the existing technology, there is no effective method to separate the water in industrial sludge, resulting in large volume and high quality of industrial sludge, which is not convenient for subsequent sewage. The treatment and utilization of mud also cause great damage to the environment

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