不同乙酸钠/甘油比对好氧/延长闲置SBR除磷性能的影响

以合成废水为研究对象,以甘油和生活污水中常见的乙酸钠作为碳源,建立了5个好氧/延长闲置序批式反应器(乙酸钠/甘油比分别为1∶0、4∶1、1∶1、1∶4和0∶1),考察了各反应器长期运行过程中的除磷效果,并通过分析典型周期内磷及微生物体内各储能物质的变化,初步探究不同乙酸钠/甘油比对除磷性能的影响机理.研究表明,当乙酸钠/甘油比由1∶0逐渐降至4∶1和1∶1时,平均除磷率由90.1%升至92.5%、97.3%.乙酸钠/甘油比继续降至1∶4及0∶1时,系统除磷率降至65.7%、53.4%.当乙酸钠/甘油比为1∶1时,聚磷菌体内合成大量聚羟基脂肪酸酯(PHAs)(2.55 mmol·g-1,以每g VSS积累的C(mmol)计,下同),为后续磷的吸收及聚磷合成提供更多的能量,而以甘油作为单一碳源时,PHAs合成量最少(0.82 mmol·g-1),糖原合成量最大(2.56 mmol·g-1,以每g VSS积累的C(mmol)计).

Effect of different ratios of acetate to glycerol on biological phosphorus removal in sequencing batch reactor operated as oxic/extended-idle regime

To investigate the effect of different influent acetate/glycerol ratios (4:0,4:1,1:1,1:4 and 0:4) on biological phosphorus(P) removal performance of sequencing batch reactor operated as oxic/extended-idle regime. The variations of P and intracellular polymers were analysised to explore the mechanism for the effect of acetate/glycerol ratios. The results showed that 90.1%,92.5%, and 97.3% of P removal efficiencies were respectively obtained in R1, R2 and R3. However, with acetate/glycerol ratio decreased to 1:4 and 0:4, the P removal efficiceny decreased to 65.7% and 53.4%, respectively. It can be found that 2.55 mmol(C)·g^-1(VSS) polyhydroxyalkanoate (PHAs) were synthesized with an acetate/glycerol ratio of 1:1, which can be the energy resource for SOP uptake. In constrast, just 0.82 mmol(C)·g^-1(VSS) PHAs but high glycogen (2.56 mmol(C)·g^-1(VSS)) were accumulated when glycerol was used as the sole carbon source.