Abstract: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.
