Method for recycling sludge during waste-water treatment
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.
National Cheng Kung University
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Yeu-Juin Hung-Ta Hung-Yuan Min-Shing Li-Hsing
Tuan Chen Hsiao Tsai Shih