Patents by Inventor Li-Hsing Shih

Li-Hsing Shih has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for recycling sludge during waste-water treatment
    Patent number: 7285222
    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.
    Type: Grant
    Filed: June 13, 2005
    Date of Patent: October 23, 2007
    Assignee: National Cheng Kung University
    Inventors: Hung-Yuan Hsiao, Min-Shing Tsai, Li-Hsing Shih, Hung-Ta Chen, Yeu-Juin Tuan
  • Method for recycling sludge during waste-water treatment
    Publication number: 20060278583
    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.
    Type: Application
    Filed: June 13, 2005
    Publication date: December 14, 2006
    Inventors: Hung-Yuan Hsiao, Ming-Shing Tsai, Li-Hsing Shih, Hung-Ta Chen, Yeu-Juin Tuan