Effect of preozonation on improvement of settleability of solid in highly concentrated organic wastewater of Japanese wheat and sweet potato spirit-distillery

Article type: Research Article

Authors: Tateda, Masafumi | Fujita, Masanori | Ike, Michihiko | QUI, Yen-feng | Kokubo, Satoru

Affiliations: College of Environmental Technology, Toyama Prefectural University, Japan | Department of Environmental Engineering, Graduate School of Engineering, Osaka University, Japan | Espec Co., Ltd., Japan | JC Engineering Co., Ltd., Japan

Note: [] Corresponding author. E-mail: [email protected]

Abstract: Solid-liquid separation of the wastewater is very difficult because of high viscosity and high SS concentration. In this study, the effectiveness of preozonation on improving the settleability of the solids in wheat and sweet potato wastewaters was investigated using a bench-scale system and pilot treatment system respectively. Results showed that solid-liquid separation in the wheat wastewater was greatly improved by the decanter in the system (SS reduction from 24100 mg/L to 100 mg/L). However, preozonation practice did not show a significant effect on solid-liquid separation of the sweet potato wastewater. Effect of preozonation on solid-liquid separation between wheat and sweet potato wastewater showed different.

Keywords: Japanese spirit-distillery wastewater, wheat wastewater, sweet potato wastewater, London dumping convention, ozonation, settleability, solid-liquid separation

Journal: Journal of Environmental Sciences, vol. 16, no. 2, pp. 230-233, 2004