微量金属对硫酸盐有机废水厌氧处理颗粒污泥活性的影响

The Influence of Trace Metal on Granular Sludge of Anaerobic Treating Sulphate Organic Wastewater

采用厌氧反应装置，接种取自 UASB 反应器的硫酸盐有机废水厌氧处理颗粒污泥，以人工配制的含硫酸盐有机废水（蔗糖提供有机物）为原水，分别添加不同质量浓度的微量金属（Fe2＋、Co2＋、Ni2＋），通过间歇试验，研究了不同质量浓度的微量金属（Fe2＋、Co2＋、Ni2＋）条件下，厌氧反应装置中 COD 和硫酸盐的去除率及产甲烷情况。试验结果表明，在 Fe2＋质量浓度0-12 mg·L-1、Co2＋质量浓度0-0.5 mg·L-1、Ni2＋质量浓度0-0.6 mg·L-1范围内，厌氧颗粒污泥的COD去除率和产甲烷速率分别随Fe2＋、Co2＋、Ni2＋浓度的增加而增高。在Fe2＋质量浓度0-12 mg·L-1范围内，厌氧颗粒污泥对SO42-去除率随Fe2＋浓度的增加略有增高，但在Co2＋质量浓度0-0.5 mg·L-1、Ni2＋质量浓度0-2.0 mg·L-1范围内，厌氧颗粒污泥的SO42-去除率分别随Co2＋和Ni2＋浓度的增加而降低。因此，在一定浓度范围内，Fe2＋的投加能同时激活MPB和SRB，Co2＋和Ni2＋的投加能激活MPB但对SRB活性产生抑制作用，为硫酸盐有机废水厌氧处理提供一定的理论指导。

Bach tests in anaerobic bioreactor were conducted to investigate the effects of trace metals （Fe2＋, Co2＋, Ni2＋） on the removal efficiencies of chemical oxygen demand （COD） and sulfate along with methane production rate of anaerobic granular sludge. The artificial sulfate organic wastewater was the influent water with sucrose as the carbon source, and the seeding sludge was from a lab-scale running up-flow anaerobic sludge blanket （UASB）. The results showed that both COD removal efficiency and methane production rate increased with increasing mass concentrations of trace metals （Fe2＋0 to12 mg·L-1, Co2＋0 to 0.5 mg·L-1, Ni2＋0 to 0.6 mg·L-1, respectively）. However, the sulfate removal efficiency showed downtrend with increasing mass concentrations of Co2＋from 0 to 0.5 mg·L-1 and Ni2＋from 0 to 2.0 mg·L-1, respectively. And it slightly increased with increasing mass concentration of Fe2＋from 0 to12 mg·L-1. Thus, the addition of Fe2＋ could activate the activity of methane production bacteria （MPB） and sulfate-reducing bacteria （SRB）. However, the addition of Co2＋ and Ni2＋ have contrary effects which was realized by activation on MPB and inhibition on SRB, respectively. The results of this study provided a theoretical guidance for the treatment of sulfate organic wastewater.