硫酸盐还原菌固定化填料滤池对硫酸盐的去除

Removal of Sulfate in Biofilter Packed with Immobilized Sulfate Reducing Bacteria

硫酸盐还原作为硫酸盐废水生物处理的第一步反应,其还原效能直接影响后续反应器的运行。采用聚乙烯醇—硼酸二次交联方法将硫酸盐还原菌进行局部包埋固定化处理,制备出生物活性填料并建立起升流式厌氧生物滤池。分析结果表明,该厌氧生物滤池经过短时间的活性恢复培养运行即可具备还原硫酸盐的能力;生物滤池对硫酸盐的还原率稳定在85%以上,出水硫酸盐浓度<250 mg/L,且硫酸盐还原反应主要集中在滤层的进水端。通过对填料的静态试验分析,滤池出水中溶解性的硫化物浓度并未达到对SRB的活性产生抑制的程度,生物量是去除硫酸盐的主要决定因素。

Sulfate reduction process is the first step in the biological treatment of sulfate wastewater, and its performance directly affects the operation of the subsequent reactor. Sulfate reducing bacteria （SRB） were embedded and immobilized using the method of polyvinyl alcohol-boric acid second- ary cross linking, bioactive fillers were prepared, and an up-flow anaerobic biological filter was built. The analysis results showed that after a short period of operation for activity recovery and culture, the an- aerobic biological filter could have the capacity of sulfate reduction. The sulfate reduction rate of the bio- logical filter stabilized at more than 85% , the effluent sulfate concentration was less than 250 mg,/L, and the sulfate reduction took place mainly at the inlet of the filter layer. The concentration of dissolved sul- fide in the filtered water did not reach the level of inhibiting SRB activity, and biomass was a major deter- minant in sulfate removal.