Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China.
Int J Environ Res Public Health. 2022 May 27;19(11):6543. doi: 10.3390/ijerph19116543.
In this work, a method of enhanced packed-bed microbial oxidation-neutralization has been employed to treat Fe-rich acid mine drainage. The method features the use of a large number of immobile () in a bioreactor to promote the oxidation of Fe to Fe. Results show that when the influent Fe concentration is about 900 mg/L and the Fe oxidation efficiency tends to 100%, the maximum oxidation rate of Fe in the bio-ceramsite, bio-volcanic stone, and bio-activated carbon packed columns are 301 mg/(L·h), 234 mg/(L·h), and 139 mg/(L·h), respectively. Compared with the direct neutralization method, the enhanced microbial oxidation-neutralization method has several advantages. Firstly, it oxidizes Fe to Fe, directly neutralizing the acid mine drainage at low pH and reducing the consumption of neutralizer. Secondly, more economical CaCO can be used as neutralizer. Thirdly, it produces precipitates with high solid content (5.50%), good settling performance (SV = 4%), and small volume, and the capillary suction time (CST) is 8.9 s, which is easy to dehydrate.
在这项工作中，采用了强化固定床微生物氧化中和法来处理富铁酸性矿山排水。该方法的特点是在生物反应器中使用大量的不活动的（）来促进 Fe 的氧化为 Fe。结果表明，当进水 Fe 浓度约为 900mg/L 且 Fe 氧化效率趋于 100%时，生物陶粒、生物火山石和生物活性炭填充柱中 Fe 的最大氧化速率分别为 301mg/（L·h）、234mg/（L·h）和 139mg/（L·h）。与直接中和法相比，强化微生物氧化中和法具有几个优点。首先，它将 Fe 氧化为 Fe，可直接中和低 pH 值的酸性矿山排水，并减少中和剂的消耗。其次，可以使用更经济的 CaCO3作为中和剂。第三，它产生的沉淀物具有高固含量（5.50%）、良好的沉降性能（SV=4%）和较小的体积，毛细吸水时间（CST）为 8.9s，易于脱水。
