(天津大学 化工学院, 天津 300072)
摘 要: 研究利用硫酸盐还原菌(sulfate reducing bacteria, SRB)与单质铁协同作用处理含Zn2+废水的效果和相应机理。 采用间歇式生物反应器, 在Zn2+名义浓度为0~90 mg/L范围内, 分别考察SRB和SRB+Fe0两种体系的处理效果。 实验表明: SRB+Fe0体系的处理效果明显优于SRB体系; 加入单质铁之后, 高Zn2+浓度下(>75 mg/L)SRB适应期缩短20%以上; Zn2+对SRB的抑制浓度提高约20%; 硫酸盐还原速率明显加快, 硫酸盐最终还原率以及Zn2+的去除速率都有所提高。 分析了单质铁对废水处理过程的强化机理, 确定Zn2+的去除形式主要为硫化物沉淀。
关键字: 单质铁; 酸性含锌废水; 硫酸盐还原菌
(School of Chemical Engineering and Technology, Tianjin University,
Tianjin 300072, China)
Abstract: The treatment of wastewater containing Zn2+ by sulfate reducing bacteria cooperated with Fe0 was studied. Two systems of SRB and SRB+Fe0 were experimented in batch bioreactor, with Zn2+ concentration in the range of 0-90 mg/L. The results show that the SRB+Fe0 system performs much better than SRB system. With the presence of iron, the acclimation period of SRB reduces more than 20% under high Zn2+ concentration; the inhibiting concentration of Zn2+ to SRB increases by approximately 20%; the reduction velocity of sulfate is fastened apparently, meanwhile the ultimate sulfate reduction rate and Zn2+ removal rate are improved to a certain extent. The enhancement principle of iron was analyzed and it is concluded that the removal of Zn2+ is mainly in terms of sulfide precipitate.
Key words: iron; acid zinc wastewater; sulfate reducing bacteria