复合嗜酸亚铁氧化柱的长期运行特征

采用两种填料构建了淹没式复合嗜酸亚铁氧化柱,考察不同亚铁浓度条件下实际铀矿浸出尾液在氧化柱内的长期氧化效果和温度变化对氧化柱稳定性的影响。结果表明：在26~36℃条件下,在亚铁负荷分别为0.200gFe²⁺/(L·h)、0.325gFe²⁺/(L·h)和0.825gFe²⁺/(L·h)时,三组氧化柱均可长期稳定运行,出液氧化还原电位（E_h）平均值为629mV、620mV和596mV;在中温低负荷氧化柱内相对贫营养的耐低温菌易于优势生长,进入低温阶段后氧化柱仍可维持相对稳定的亚铁氧化负荷0.200gFe²⁺/(L·h);在中温高负荷氧化柱内中温菌易于优势生长,进入低温阶段后氧化柱亚铁负荷显著下降,其亚铁氧化负荷仅为中温阶段的1/3。

Long-term performance of the composite acidophilic ferrous oxide column

A flooded composite acid ferrous oxide column was constructed by using two kinds of filler. Under different ferrous concentrations, the long-term performance of ferrous oxidation in the oxide column and the effect of temperature were investigated. The results showed that the three sets of oxidation columns could be stably operated for a long time at the temperature of 26―36℃, when the ferrous load was 0.200gFe²⁺/(L·h), 0.325gFe²⁺/(L·h) and 0.825gFe²⁺/(L·h), respectively, and the average E_h in the effluent was 629mV, 620mV and 596mV, respectively. The relatively eutrophic low temperature resistant bacteria in the medium temperature and low load oxidation column were easy to grow, and after entering the low temperature stage, the oxidation column could maintain a relatively stable ferrous oxidation load of 0.200gFe²⁺/(L·h). In the medium temperature and high load oxidation column, the moderate temperature bacteria were easy to grow, and after entering the low temperature stage, the ferrous oxidation ability decreased obviouslyand its ferrous oxidation load was only 1/3 of the medium temperature.