The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2007
Filed:
Jun. 13, 2005
Hung-yuan Hsiao, Tainan, TW;
Min-shing Tsai, Tainan, TW;
Li-hsing Shih, Tainan, TW;
Hung-ta Chen, Tainan, TW;
Yeu-juin Tuan, Tainan, TW;
Hung-Yuan Hsiao, Tainan, TW;
Min-Shing Tsai, Tainan, TW;
Li-Hsing Shih, Tainan, TW;
Hung-Ta Chen, Tainan, TW;
Yeu-Juin Tuan, Tainan, TW;
National Cheng Kung University, Tainan, TW;
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.