pH冲击对同步厌氧生物脱氮除硫反应器性能的影响

Effect of pH Shock on Performance of Reactor for Simultaneous Anaerobic Sulfide and Nitrate Removal

研究了pH冲击对同步厌氧生物脱氮除硫反应器性能的影响。同步厌氧生物脱氮除硫体系的酸碱缓冲容量不大,反应液pH值对进水pH冲击的响应较为灵敏。实际响应曲线不同于单纯水力停留时间分布所致的理论响应曲线,反应液pH值变化是水力传递等物理作用、基质解离等化学作用以及细菌代谢等生物作用的综合效应。pH值冲击对硫化物氧化过程有一定的影响,但可恢复。反应液pH值较高时,出水硫酸盐质量浓度较低,高pH值可抑制硫化物向硫酸盐的完全氧化。硝酸盐还原对pH冲击较为敏感,但出水硝酸盐质量浓度对pH冲击的响应曲线具有滞后性,可能与硝酸盐运输至细胞体内的运输方式有关。

The effect of pH shock on the performance of reactor for simultaneous anaerobic sulfide and nitrate removal was investigated in this study.The response of pH in reaction system to the pH shock was very sensitive,even though there were phosphate and carbonate to buffer pH variations.The practical pH responsive curve was different from the theoretical one caused by hydraulic retention time distribution,which means that is the comprehensive results from physical,chemical and biological interaction.The sulfide-oxidation was infuenced in some way by pH shock,but recoverable.The higher pH in reaction system,the lower sulfate concentration in the effluent,which suggested that high pH inhibits the sulfur oxidation.The nitrate reduction was sensitive to pH shock,but the responsive curve of effluent nitrate concentration slightly lagged behind,which was possibly related with the mechaniam of nitrate uptake.