2011 Fiscal Year Final Research Report

Phosphate recovery and protection of eutrophication by bioreactor retaining halophilic polyphosphate accumulating bacteria

Research Project

Project/Area Number	23656331
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Civil and environmental engineering
Research Institution	Hiroshima University
Principal Investigator	OHASHI Akiyoshi 広島大学, 大学院・工学研究院, 教授 (70169035)
Project Period (FY)	2011
Keywords	環境保全
Research Abstract	The objective of this study is to develop a new biotechnology to condense low phosphate concentration solutions for phosphate recovery from seawater containing very great abundance of phosphate, based on the principle of biological phosphate removal applied to wastewater treatments. A phosphate recovery experiment was conducted using a DHS reactor with a synthetic seawater. The results show that 12 hour cycle of 3 hour anaerobic and 9 hour aerobic conditions is most appropriate to dominate polyphosphate accumulating bacteria, and demonstrated that the new technology would concentrate seawater to more than 100 mgP. l^<-1>

(3 results)