产酸脱硫反应器中COD/SO_4^(2-)比对硫酸盐去除率的影响研究

Effect of COD/SO_4^(2-) Ratio on Sulfate Removal Rate in Acidogenic Sulfate-reducing Reactor

采用两相厌氧生物处理工艺的产酸相作为硫酸盐还原单元,以食用红糖为碳源,通过连续流实验,重点研究了产酸相中COD/SO42-值(C/S)对SO42-去除率的影响。在(34±1)℃、进水碱度(ALK)(300~500)mg/L、pH(6.0~6.2)、氧化还原电位(ORP)(-250^-350)mV等条件下,当进水C/S<2.0时,SO24-去除率小于81%;当进水C/S值为2.5~2.0时,SO42-去除率为(90~81)%;当进水C/S值为大于2.5时,SO24-去除率为90%以上。随着C/S值的降低,SO24-的去除效果会将有所降低。

In order to investigate the effect of COD/SO4^2- （C/S）ratio on sulfate removal rate in an acidogenic phase reactor of two-phase anaerobic bio-treatment system,a group of continuous-flow experiments were conducted in an acidogenic sulfate-reducing reactor in which red-sugar was the source of COD . The operation conditions of the reactor was controlled as follows ： temperature at （ 34 ± 1 ） ℃, influent alkalinity （ALK） at 300 mg/L to 500 rag/L, at pH6.0 to pH6.2 ,oxidation reduction potential（ORP） at -250 mV to -350 mV. It was demonstrated that the sulfate removal rate would be less than 81% when the influent C/S ratio was less than 2.0,and 81% to 90% suflate removal rate could achieved when the influent C/S ratio was at 2.0 to 2.5, and more than 90% when C/S rate was more than 2.5. In conclusion ,with the influent C/S ratio reduced, the sulfate removal rate reduced ,too.