麦饭石井下原位处理煤矿酸性废水的强化试验研究

Study on Treating Acid Mine Drainage by Strengthened Maifan Stone In-situ

采用添加硫酸盐还原菌(SRB)与零价铁(Fe0)构建以麦饭石(MFS)为主体的可渗透性反应墙,模拟井下煤矿酸性废水(AMD)原位修复过程,比较生化强化与物化强化两种方式对处理能力的影响。结果表明,添加硫酸盐还原菌的麦饭石(SRB-MFS)和添加零价铁的麦饭石(Fe0-MFS)去除能力均强于单独MFS;SRB-MFS对SO42-的去除有明显优势,但对Mn2+的去除不及Fe0-MFS,两种强化方式对可溶性Fe2+的去除效果差别不大,出水均为弱碱性。

Sulfate reducing bacteria（SRB） and zero-valent iron（Fe0） were added to permeable reactive barriers（PRB） containing maifan stone（MFS） respectively. An experiment simulated the process of treating AMD in-situ by these PRBs was conducted to investigate the effects of different reinforcement modes： one strengthened by biochemistry and the other strengthened by physicochemistry. The results showed that both PRB-1（SRBMFS） packed with SRB and MFS and PRB-2（Fe0-MFS） packed with Fe0 and MFS had a batter performance than PRB-3 packed with MFS alone. The SRB-MFS had a higher SO42- removal efficiency than others, but lower Mn2＋ removal efficiency when compared to Fe0-MFS. However approximate Fe2＋ removal efficiencies were achieved by SRB-MFS and Fe0-MFS, as well as both effluent p H value were neutral or alkalescency.