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Environ Sci Pollut Res Int. 2016 Oct;23(19):19797-805. doi: 10.1007/s11356-016-7197-9. Epub 2016 Jul 14.

A novel method for harmless disposal and resource reutilization of steel wire rope sludges.

Author information

1
College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China.
2
College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China. yshliu@pku.edu.cn.

Abstract

Rapid development of steel wire rope industry has led to the generation of large quantities of pickling sludge, which causes significant ecological problems and considerable negative environmental effects. In this study, a novel method was proposed for harmless disposal and resource reutilization of the steel wire rope sludge. Based on the method, two steel wire rope sludges (the Pb sludge and the Zn sludge) were firstly extracted by hydrochloric or sulfuric acid and then mixed with the hydrochloride acid extracting solution of aluminum skimmings to produce composite polyaluminum ferric flocculants. The optimum conditions (acid concentration, w/v ratio, reaction time, and reaction temperature) for acid extraction of the sludges were studied. Results showed that 97.03 % of Pb sludge and 96.20 % of Zn sludge were extracted. Leaching potential of the residues after acid extraction was evaluated, and a proposed treatment for the residues had been instructed. The obtained flocculant products were used to purify the real domestic wastewater and showed an equivalent or better performance than the commercial ones. This method is environmental-friendly and cost-effective when compared with the conventional sludge treatments.

KEYWORDS:

Acid extraction; Domestic wastewater; Flocculant; Harmless disposal; Resource reutilization; Steel wire rope sludge

PMID:
27417326
DOI:
10.1007/s11356-016-7197-9
[Indexed for MEDLINE]

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