混合硫酸盐还原菌代谢过程的影响因素

采用间歇实验,研究不同初始pH、Fe2+投加量、COD/SO24-及NO3-/SO24-比值等因素对SRB还原硫酸盐效果与速率的影响。实验结果表明:中性条件下(pH=7),硫酸盐的去除效果最佳,去除率达到84.66%,还原速率为15.07 mg/(L.h),在初始pH为4～9的范围内,体系具有较好的缓冲能力;当COD/SO24-比值为3时,反应209 h,硫酸盐去除率为85.33%,还原速率为8.16 mg/(L.h),随着反应的进行,体系的pH趋于中性;当溶液中有亚铁离子存在,且浓度为0～200 mg/L时可促进硫酸盐还原菌的生长,提高其对硫酸盐的去除率;NO3-对硫酸盐的还原有明显的抑制作用。

Influencing factors on metabolism process of mixed sulfate-reducing bacteria

The effects of several factors on reduction of sulfate by SRB and its velocity were investigated,including initial pH,Fe2+,COD/SO2-4 and NO-3/SO2-4 ratio.The results showed that 84.66% of sulfate could be removed at the velocity of 15.07 mg/(L·h) under neutral condition(pH=7).And the reaction system performed a relatively good capacity of buffering in the initial pH range of 4~9.Sulfate removal efficiency could reach up to 85.33% at the velocity of 8.16 mg/(L·h) and COD/SO2-4 ratio of 3 after 209 h,the system being gradually neutralized with the proceeding of the reaction.The efficiency of removing sulfate was enhanced in the presence of Fe2+with the concentration of 0~200 mg/L,while the existence of NO-3 apparently adversely affected the system.