影响EBPR系统生物除磷的主要因素

RESEARCH ON MAIN FACTORS OF INFLUENCING BIOLOGICAL P-PEMOVAL IN EBPR SYSTEM

以投加GMTR菌株后获得稳定除磷效果的EBPR装置为研究对象,研究进水中乙酸盐比例、进水pH值及污泥停留时间对其除磷效果的影响。试验结果表明:厌氧前45min,当乙酸质量分数<30%时,释磷量随废水中乙酸浓度增大而逐渐增大;厌氧2h后,废水中乙酸浓度对释磷量影响较小。厌氧释磷、好氧吸磷及COD降解最适pH值均为6.0～7.0;当pH值>8.0时,系统失去强化生物除磷能力,磷去除率仅为39.7%,出水COD浓度明显提高。当污泥泥龄为4d时,出水磷浓度较低,装置的运行效果最好。

Taking enhanced biological phosphrous removal(EBPR)system as the object of study,it was researched the effects of influent's acetate concentration & pH and resident time of sludge on its phosphorus removal(PR).Test results showed that PR rate was increased gradually with the increase of acetate concentration when acetic acid was less than 30% before keeping anaerobic condition for 45 min;after keeping anaerobic condition for 2 h,the concentration of acetic acid has less effect on PR.The suitable pH was 6.0～7.0 for anaerobic PR,aerobic obsorption of phosphorus and COD degradation.When pH was larger than 8.0 the system would lose EBPR capacity and PR was only 39.7%.If the age was 4 d the concentration of P in the effluent was lower and the system would have the best running effect.