温度变化对生物除磷系统的影响

Impact of temperature on EBPR system

以厌氧/好氧交替运行的SBR系统为研究对象,母反应器运行温度控制在15℃,采用实际生活污水,考察了温度（5、10、20、25、30、35℃）对EBPR系统的冲击影响。结果表明,温度较低（〈10℃）情况下,由于对微生物生理活性产生抑制而使系统除磷效率大幅度下降,由20℃时出水磷浓度为0 mg.L-1升高至5℃时的6.95 mg.L-1,而且胞内聚合物PHB的降解量下降,使系统内PHB处于累积状态。温度较高（25~30℃）时,系统能保持高效运行,并保持良好除磷效果,但当温度高于30℃时,出水磷浓度开始恶化,出水磷浓度为3.33mg.L-1,吸磷效率下降。根据在不同温度条件下,厌氧PHB合成速率RPHB-produced与磷释放速率RP-release的比值R1和好氧条件下PHB降解速率RPHB-degradation与磷吸收速率RP-uptake的比值R2可以得出结论,在环境温度为20℃的条件下,更有利于系统内EBPR高效稳定的运行。

The impact of temperature（5℃,10℃,20℃,25℃,30℃ and 35℃）on biological phosphorus removal system was investigated using anaerobic/aerobic SBR system in a lab scale with domestic wastewater.The results showed that under the low temperature（10℃）,the performance of phosphorus removal and PHB-degradation fell off obviously due to the decrease of microbe activity,the phosphorus concentration in effluent rose to 6.95 mg·L-1 at 5℃ from 0 mg·L-1 at 20℃.The degradation of PHB declined and accumulated in the system gradually.When the temperature was between 25℃ and 30℃,the average phosphorus removal efficiency could keep at high level.But when higher than 30℃,the phosphorus concentration in effluent rose to 3.33 mg·L-1.The phosphorus removal efficiency lost gradually.The results of lab test showed that the critical temperature to keep the high biological phosphorus removal efficiency was 20℃,based on the ratio of R1=RPHB-produced/RP-release for anaerobes and R2=RPHB-degradation/RP-uptake for aerobes.