National Cheng-kung University

Min-Shing Tsai

Hung-Ta Chen

Juu-En Chang

You-Shen Chen

Hung-Yuan Hsiao

Yeu-Juin Tuan

Jun-Yi Wu

Tsair-Fuh Lin

Li-Hsing Shih

Ting-Che Hsiao

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.

Method for recycling sludge during waste-water treatment

This invention offers an integrated technology in sequential treatment of wastewater. Low biodegradable organics and heavy metal ions are both contained in wastewater from surface finishing processes. The aim of the invention is to find the solution for treatment of organics and heavy metal ions in complicated wastewater that contains organics and heavy metal ions sequentially. Low biodegradable organics are oxidized by a fenton process with pH ranging from 2 to 5 and temperature ranging from 20&#xb0; C. to 100&#xb0; C. Heavy metal ions are then treated by a ferrite process with pH ranging from 8 to 12 and temperature ranging from 20&#xb0; C. to 100&#xb0; C. The integrated technology of the fenton process and the ferrite process (2FP) is advantageous to treat the wastewater from surface finishing processes, decrease the production of iron sludge caused in the fenton process and increase the quality of ferrite products.

Integrated technology in sequential treatment of organics and heavy metal ions wastewater

Growing community of inventors

Tainan, Taiwan

Min-Shing Tsai