Abstract:

The high sulfate content and low pH of wastewater from ionic rare earth mine in southern Jiangxi Province affect the treatment of other components（NH₄ ⁺-N，NO₃ ^--N） of the wastewater by downstream microorganisms. Particle-encapsulated sulfate-reducing bacteria（SRB） can effectively remove sulfate ions and increase the pH of water. In the present study， four components of SRB embedded particles including surface adsorption materials，reduction activation materials，cohesive carbon sources and solid acid hydrolysis materials were researched. The optimization results indicated that the application effect of attapulgite powder as the surface adsorption material for SRB embedded particles was relatively good，and the reduction activation effect of nano-zero-valent iron was relatively better. The combination of a cohesive carbon source and solid acid hydrolysis material consisting of corn kernel，peanut shell and zeolite powder，Fe₃O₄ powder yielded the relatively favorable outcome. On this basis，four types of embedded particles were screened and prepared，and their removal efficiencies of SO₄ ^2- in simulated wastewater were verified through anaerobic triangular flasks. It was found that the four prepared embedded particles had removal rates of over 60% for SO₄ ^2- after 10 days of experimentation，and the highest removal rate was attributed to the peanut shell-Fe₃O₄ combined embedded particles，which was 80.20%.

Key words: sulfate reducing bacteria, reduction activation, carbon source, acid mine drainage

摘要：

赣南离子型稀土矿尾水存在SO₄ ^2-含量高、pH偏低的问题，影响后续微生物对尾水其他组分（NH₄ ⁺-N、NO₃ ^--N）的处理，拟采用硫酸盐还原菌（SRB）包埋颗粒对水体中SO₄ ^2-进行去除，同时提升水体pH。通过对SRB包埋颗粒表面吸附材料、还原激活材料、内聚碳源和固体酸水解材料4个组分进行实验研究优选SRB包埋颗粒组分，结果表明，凹凸棒石粉作为SRB包埋颗粒表面吸附材料应用效果比较好，纳米零价铁对SRB的还原激活作用相对更好，内聚碳源及固体酸水解材料组合以玉米芯、花生壳与沸石粉、磁铁矿粉的组合效果比较理想。在此基础上筛选制备出4种包埋颗粒，通过厌氧三角瓶验证其对模拟废水中SO₄ ^2-的去除效果，发现制备的4种包埋颗粒经过10 d的实验对SO₄ ^2-的去除率都在60%以上，去除率最高的是花生壳-Fe₃O₄组合包埋颗粒，为80.20%。

关键词: 硫酸盐还原菌, 还原激活, 碳源, 酸性矿山废水

CLC Number: 

• X703.1