Effect of carbon source and nitrate concentration on denitrifying phosphorus removal by DPB sludge

Abstract： Effect of added carbon source and nitrate concentration on the denitrifying phosphorus removal by DPB sludge was systematically studied using batch experiments, at the same time the variation of ORP was investigated.Results showed that the denitrifying and phosphorus uptake rate in anoxic phase increased with the high initial anaerobic carbon source addition. However once the initial COD concentration reached a certain level, which was in excess to the PHB saturation of poly-P bacteria, residual COD carried over to anoxic phase inhibited the subsequent denitrifying phosphorus uptake. Simultaneously, phosphate uptake continued until all nitrate was removed, following a slow endogenous release of phosphate. High nitrate concentration in anoxic phase increased the initial denitrifying phosphorus rate. Once the nitrate was exhausted, phosphate uptake changed to release. Moreover, the time of this turning point occurred later with the higher nitrate addition. On the other hand, through on-line monitoring the variation of the ORP with different initial COD concentration , it was found ORP could be used as a control parameter for phosphorus release, but it is impossible to utilize ORP for controlling the denitrificaion and anoxic phosphorus uptake operations. 作 者： WANG Ya-yi    PENG Yong-zhen    Wang Shu-ying    PAN Mian-li   作者單位： WANG Ya-yi(College of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150008, China)

PENG Yong-zhen,Wang Shu-ying(College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100022, China)

PAN Mian-li(Hangzhou Huadong Gene-Technology Institute, Hangzhou 310000, China) 

期 刊： 環(huán)境科學(xué)學(xué)報(bào)(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(4)  分類號(hào)： X131.2 X703  Keywords： biological phosphorus removal    carbon source    nitrate    ORP    denitrifying phosphorus removal bacteria (DPB)    anaerobic-anoxic processes   

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