Monitoring ORP, pH and EC for the Start-up of an A/O SBR
With the synthetic municipal wastewater as influent, the aim of this paper is to investigate the information provided by monitoring oxidation reduction potential (ORP), pH, electric conductivity (EC) and analyzing wastewater samples in an Anaerobic/aerobic sequencing batch reactor (A/O SBR) during the start-up period. The reactor was seeded by activated sludge from a municipal wastewater treatment plant. The results show that anaerobic P-release finished and EC reached maximum point after 45 minutes operation, while ORP reached the minimum point at that moment. Then, the ORP curve was flat. During the aerobic phase, PO4 3-concentration decreased to 0.7mg/L and there appeared a bending-point in the EC curve after 105 minutes aeration, then pH began to slightly decrease. According to these results, the reactive cycle was optimized: the anaerobic and aerobic phases were shortened to 45 minutes and 105 minutes respectively. The nitrite and nitrate disappeared from the reactor after 8 cycles. The anaerobic P-release and aerobic P-uptake rate greatly increased. Therefore, it is realistic to quickly start up the A/O SBR using ORP, pH, EC as control parameters.
ORP pH EC SBR start-up
Xu Yan-ying Zheng Xi-lai Yang Tong-suo Zou Ying-jie
Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education Ocean University of China Qingdao, China
国际会议
上海
英文
3459-3462
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）