Recovery of coagulant from water supply plant sludge and its effect on clarification |
| |
| Authors: | Seiichi Ishikawa Naoko Ueda Yuji Okumura Yoshikazu Iida Kenzo Baba |
| |
| Institution: | (1) Graduate School of Environmental Engineering, University of Kitakyushu, 1-2-1 Shin-ike, Tobata-ku, Kitakyushu 804-0082, Japan;(2) Kitakyushu City Institute of Environmental Sciences, Kitakyushu, Japan;(3) Waterworks Bureau, Kitakyushu City, Kitakyushu, Japan |
| |
| Abstract: | Spent coagulant in water supply plant sludge was extracted with H2SO4 and the efficiency of the reused coagulant was studied. The optimum pH values for coagulant extraction and clarification
with the reused coagulant were 3.0–4.0 and about 6, respectively. In treating raw influent obtained from a sewage treatment
plant and wastewater from a coastal landfill site, the removal of chemical oxygen demand (COD), total nitrogen, and total
phosphorous with the recovered coagulant was higher than that with commercial aluminum sulfate or polyaluminum chloride. In
addition, the sludge settling properties, the extra sludge mass formation, the supernatant quality, and the cost of reagents
were also studied. The coagulant recovered from water supply plant sludge by H2SO4 extraction could be successfully reused for the clarification of domestic and food industry wastewaters. |
| |
| Keywords: | Water supply plant sludge Recovery and reuse of coagulant Clarification COD Nutrients |
| 本文献已被 SpringerLink 等数据库收录！ |
|
