微生物反应器硫酸盐还原影响因素试验

Experiment on Influencing Factors of Sulfate Reduction in Microbial Reactors

由于酸法地浸生产常年注入硫酸导致采区及其周边地下水形成硫酸盐污染。为解决此问题,采用硫酸盐还原菌培养液模拟矿山废水,利用生物反应器进行循环批次试验和连续运行试验,探讨不同种类填料、循环上升流速、水力停留时间(HRT)、进水SO_(4)^(2-)浓度、COD/SO_(4)^(2-)值等对硫酸盐还原效果的影响。试验结果显示,最佳运行条件为:海绵+K3混合填料、HRT=12 h、进水SO_(4)^(2-)浓度约0.8 g/L、COD/SO_(4)^(2-)=2;长期运行结果表明,30℃时,连续出水SO_(4)^(2-)浓度约0.10 g/L,SO_(4)^(2-)去除率达到87.9%,达到地下水Ⅳ类水及以上标准。

Sulfate pollution to the mining area and its surrounding groundwater was caused by perennial injection of sulfuric acid during acid in-situ leaching.To solve the problem,sulfate-reducing bacteria culture solution was used to simulate mine wastewater,and bioreactor was used to conduct cyclic batch tests and continuous operation tests.Effects of different fillers,circulating upward flow rate,hydraulic retention time(HRT),influent SO_(4)^(2-)concentration,and COD/SO_(4)^(2-)value on sulfate reduction were discussed.The test results show that the optimum operating conditions include sponge+K3 mixed filler,HRT=12 h,influent SO_(4)^(2-)concentration of about 0.8 g/L,and COD/SO_(4)^(2-)=2.The long-term operation results show that at 30℃,the effluent SO_(4)^(2-)concentration can reach 0.10 g/L,and removal rate of SO_(4)^(2-)is 87.9%,which meet the standard of groundwater classⅣand above.