聚烃基烷酸转化对强化生物除磷影响研究

Research on Polyhydroxyalkanoate Form a Key Aspect to Enhanced Biological Phosphorus Transformation

通过丙酸和乙酸C-mol比为0.5和2的合成废水驯化微生物的SBR反应器(SBR1和SBR2)批式实验,研究了强化生物除磷系统中聚烃基丁酸(PHB)和聚烃基戊酸(PHV)的转化对磷吸收/释放及去除率的影响.结果显示,磷的释放/吸收和去除率与PHB和PHV的转化有很好的相关性(R2>0.90).回归系数表明,特定废水驯化的污泥,磷的吸收和释放主要受PHB转化的影响,但磷的去除率却主要依赖于PHV的合成与降解;对于不同比例丙酸/乙酸废水驯化污泥,SBR2比SBR1污泥的PHB合成和降解能力增强,PHV合成和降解能力减小,生物除磷效果平均增加16.69%.因此,进水丙酸/乙酸比例及驯化影响聚磷微生物的PHB/PHV转化量,进而影响对磷的吸收/释放和除磷效果,PHB与PHV的转化量应作为生物除磷系统的关键调控因素考虑.

To investigate the influence of PHB and PHV formed on phosphorus （P） release, uptake and removal during enhanced biological phosphorus removal （EBPR）,anaerobic/aerobic batch experiments were conducted with biomass acclimated with propionic to acetic acid carbon molar ratios of 0.5 and 2 on two sequencing batch reactors （SBR1 and SBR2）. Statistically significant correlations between polyhydroxyalkanoate （PHA） quantity and form and P release/uptake and removal were observed （R2 〉0.90）. The regression coefficients showed that for biomass cultured with customizing wastewater P release and uptake were both a function of PHB but not of PHV, but higher P removal was largely because of PHV as the predominant type rather than PHV. For biomass cultured with different ratios of propionic to acetic acid, the SBR2 biomass synthesized and utilized more PHB and less PHV and showed higher net P removal （average increase of 16.69% ） than SBRI. Thus acetate/propionate content of influent had a major influence on PHA type and quantity and determine phosphorus （P） release, uptake and removal. Accordingly, PHB and PHV transformations should be taken into account as key aspect for optimizing EBPR.