A.f菌生物转盘反应器的工艺特性研究

Process Properties of Immobilized Acidithiobacillus ferrooxidans in Rotating Biological Contactor

采用嗜酸氧化亚铁硫杆菌(A.f菌)生物转盘反应器处理矿山酸性废水,研究了反应器转盘表面上固定化细菌的特性,同时还考察了HRT、进水的Fe2+浓度及转盘转速对Fe2+氧化率的影响。结果表明,以5%(体积分数)的接种量接种,进行接续性循环培养,随着培养次数的增加,Fe2+的氧化周期不断缩短(由最初的100h降至70h),反应器的氧化性能逐渐增强,连续6次循环培养后可完成反应器的启动;反应器运行稳定后,其对Fe2+的氧化速率最高可达2.32g/(L.h);Fe2+的氧化率随进水Fe2+浓度的增加而降低,在实际工程中,当进水的Fe2+浓度较高时,宜采用多级处理方式;该试验条件下,反应器的最佳HRT为4h、最佳转盘转速为7r/min。

Rotating biological contactor with immobilized AcidithiobaciUus ferrooxidans was used to treat acid mine wastewater, the process properties of Acidithiobacillus ferrooxidans biofilm on the surface of rotating biological contactor were studied, and the influences of HRT, influent Fe^2＋ and rotation speed on the FeE＋ oxidation rate were investigated. The inoculation amount is 5% （volume fraction） during the continuous cycle culture. The FeE＋ oxidation period gets much shorter （from 100 h to 70 h） and the oxidation property of the reactor gets much stronger with increasing of the culture cycles. After 6 continuous culture cycles, the reactor start-up is completed. When the reactor operates stably, its Fe^2＋ oxidation rate is up to 2.32 g/（ L · h）. Fe^2＋ oxidation rate is reduced when the influent Fe^2＋ concentration increases. In practical engineering, when the influent Fe^2＋ concentration is higher, the multi-stage treatment should be adopted. Under the experimental condition, the optimal HRT is 4 h, and the optimal rotation speed is 7 r/min.