SBR法好氧段碳源浓度对吸磷的影响

Effect of carbon source on phosphorus uptake in aerobic condition

以厌氧/好氧(A/O)生化反应器中的聚磷菌为研究对象,采用SBR工艺处理实际生活污水,探讨在好氧段碳磷质量比(m(C)/m(P))对聚磷菌(PAOs)合成聚β羟基丁酸脂(PHB)及吸磷效果的影响。研究结果表明:由于好氧段中易降解有机底物的存在,可使聚磷菌(PAOs)继续进行PHB的合成反应,并伴随磷的吸收,而不是磷的释放,这与传统理论不符;当好氧段挥发性脂肪酸(UFAs)质量浓度为150 mg/L时,PHB在好氧段的合成速率ηO远远高于反应开始在厌氧段的合成速率ηAn,前者约为后者的5倍;A/O运行模式有效地富集了PAOs,并有效抑制了普通异养菌(OHOs)的增长,并且氧化还原电位(ORP)可作为A/O除磷系统表征吸磷结束的特征点。

Aerobic synthesis of poly-β-hydroxybuyrate and uptake of phosphorus in anaerobic/aerobic condition were observed in a sequencing batch reactor（SBR） with real domestic wastewater.The results show that with easily degradable organic substrate,the uptake of ortho-phosphate and the synthesis of PHAs happens insimultaneously,which is consistent with traditional theory.The rate of PHAs synthesized in aerobic condition（ηO） is largely higher than the rate of PHAs synthesized in anaerobic condition（ηAn）.And the former is about five times larger than the later.Anaerobic/aerobic condition can enrich the populations of the PAOs,and restrains the growth of the OHOs,availably.ORP profile should be considered as the key characteristic point of phosphorus-uptake in the enhanced bio-logical phosphate removal system.