Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Reexamination Certificate
2007-10-23
2007-10-23
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
C210S713000, C210S725000, C210S727000, C210S737000, C210S912000, C210S913000, C423S036000
Reexamination Certificate
active
11150727
ABSTRACT:
A method for recycling sludge during waste-water treatment firstly utilizes a process of chemical coagulation to produce sludge rich in copper ions. The sludge is then leached in a sulfuric acid storage tank with sulfuric acid of concentration 1-2N, whereby a extractive solution with copper enrichment 18-39 g/L and residues can be obtained. The extractive solution is then processed in a refrigeration crystallization tank to form copper sulfate crystals. Further, the residues produced are added into the coagulation tank as a coagulant in the process of chemical coagulation for wastewater treatment, thereby achieving a goal of zero sludge production.
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Chen Hung-Ta
Hsiao Hung-Yuan
Shih Li-Hsing
Tsai Min-Shing
Tuan Yeu-Juin
Hruskoci Peter A.
National Cheng Kung University
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