pH主导不同反应器处理含砷酸性废水性能比较

分别采用外循环上流式厌氧污泥床(UASB)和厌氧续批式(ASBR)反应器处理模拟含砷酸性废水,考察2种厌氧反应器对模拟含砷酸性废水的处理效果及运行特性。结果表明,外循环UASB较ASBR能更好地应用于模拟废水的处理,外循环UASB和ASBR对COD、SO_4~(2-)和As(Ⅲ)的去除率分别达到74.3%、88.7%、63%和42.8%、73.2%、35%。反应体系对模拟废水的处理效果受pH主导:反应体系pH影响SRB的生长、代谢,进而影响对COD和SO42-的去除效果;As(Ⅲ)主要通过与SRB代谢产物(H_2S/S~(2-))的沉淀作用被去除,pH对AsxSy的溶解度影响较大,进而影响As(Ⅲ)的去除效率。

Performance comparison of pH-leading different reactors for the treatment of acidic wastewater containing arsenium

The external circular up-flow anaerobic sludge blanked(UASB) and anaerobic sequencing batch reactor (ASBR) have respectively been used for treating the simulated acidic wastewater containing arsenium. The treatment effects of the above two kinds of anaerobic reactors on simulated acidic wastewater containing arsenium ,as well as their running characteristics are investigated. The results show that compared with ASBR ,the external circular UASB is more suitable for the treatment of this kind of acidic wastewater. The removing rates of COD ,SO42-and As (Ⅲ) of UASB reach 74.3%,88.7%,and 63%,respectively and those of ASBR are 42.8%,73.2%,and 35%respectively. The treatment effects of the reaction systems on the simulated wastewater are mainly led by pH. The pH of reaction systems affect the growth and metabolism of SRB ,and further affect the removing effects of COD and SO42-. As (Ⅲ) is removed mainly by the precipitation of SRB metabolites product (H2S/S2-). The pH has greater in-fluence on the solubility of AsxSy,and further affects the removing effect of As(Ⅲ).