(天津大學(xué) 化工學(xué)院， 天津 300072)
摘 要: 研究利用硫酸鹽還原菌(sulfate reducing bacteria, SRB)與單質(zhì)鐵協(xié)同作用處理含Zn2+廢水的效果和相應(yīng)機(jī)理。 采用間歇式生物反應(yīng)器， 在Zn2+名義濃度為0～90 mg/L范圍內(nèi)， 分別考察SRB和SRB＋Fe0兩種體系的處理效果。 實(shí)驗(yàn)表明： SRB＋Fe0體系的處理效果明顯優(yōu)于SRB體系; 加入單質(zhì)鐵之后， 高Zn2+濃度下(＞75 mg/L)SRB適應(yīng)期縮短20%以上； Zn2+對(duì)SRB的抑制濃度提高約20%； 硫酸鹽還原速率明顯加快， 硫酸鹽最終還原率以及Zn2+的去除速率都有所提高。 分析了單質(zhì)鐵對(duì)廢水處理過(guò)程的強(qiáng)化機(jī)理， 確定Zn2+的去除形式主要為硫化物沉淀。
關(guān)鍵字: 單質(zhì)鐵; 酸性含鋅廢水; 硫酸鹽還原菌
（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
