Removal of NH3-N and organic matter from Tung-Gung River water using PU-net sponge mediated biofilter

• Main Authors: Chien-Chang Wu, 吳建璋
• Other Authors: Jie-Chung Lou
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/07014400568872818546

碩士 === 國立中山大學 === 環境工程研究所 === 102 === Due to the excess amounts of ammonia-nitrogen are found in effluent of domestic or sewer wastewater, it is to cause water pollution problems such as eutrophication, oxygen huge demand, disinfection by products in drinking water. So it is important to solve effectively the excess amounts of ammonia-nitrogen in wastewater. In this work, we set a biological filter system (including two kinds of Polyurethane PU, and one kind Polystyrene sponge) in laboratory for treating the polluted wastewater of Tong-Kan River. The object of this study is to investigate effect of operating conditions (including empty bed contact time (EBCT) and oxygen content (DO)) on conversion of ammonia-nitrogen. In primary periods, monitoring of TOC and ammonia-nitrogen was conducted in effluent of biological filter (BACF) for checking the stability of microorganism cultivated in surface of sponge. The conversion of biological filter with fine-pore PU was obtained 98% when DO at 4~6 mg/L and hydraulic retention time at 2 hr, and removal of TOC and DOC were achieved as ranging from 15% to 50%. Comparing two kinds of sponges’ results, the results of PS sponge + BACF showed sponge was easily broken after long term testing. At same operating conditions in BACF, the effect of pore size showed conversion of ammonia-nitrogen by fine pore- PU was better than that of thick pore-PU. Besides, the effect of DO showed removal of TOC at DO = 4~ 6 mg/L was better than that of DO = 1~ 2 mg/L. We suggested the good selection for treating polluted river is BACF + fine pore-PU in this work.