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The effect of continuous Ni(Ⅱ) exposure on the organic degradation and soluble microbial product(SMP) formation in two-phase anaerobic reactor

查看全文 作　　者：Wei [1,2]Wu;Tengteng [3]Duan;Hailiang [3]Song;Yan [1]Li;Ang [2]Yu;Long [2]Zhang;Aimin [1]Li 高影响力作者 机构地区：[1]State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University;[2]Jiangsu Key Lab of Environmental Engineering, Jiangsu Provincial Academy of Environmental Science;[3]School of Energy and Environment, Southeast University高影响力机构 出　　处：《Journal of Environmental Sciences》索引2015年第27卷第7期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Nos. 51178215 and 51378251);the Jiangsu Nature Science Fund (No. BK2011032);Open Science Foundation of Jiangsu (No. 50808121);the National Science and Technology Major Project for Water Pollution Control and Treatment (No. 2012ZX07301-005);the 2012 Scientific Research Open Found of Jiangsu Key Laboratory of Environmental Engineering 摘　　要：A two-phase anaerobic reactor fed with glucose substrate(3 g chemical oxygen demand(COD)/L) was used to investigate the effects of toxic metals on the degradation of organics and the soluble microbial product(SMP) formation. Low concentrations of Ni(II)(5 and10 mg/L) promoted the acid phase, whereas high concentrations(15, 20, and 25 mg/L)exhibited an inhibitory effect on, but did not alter the fermentative method, which mainly involved the fermentation of propionic acid. The methanogenic microorganism exhibited a strong capability adapting constantly increased Ni(II) levels. The acid phase was an accumulation stage of SMP. In the absence of Ni(II), the high-molecular-weight material in the effluent SMP mainly contained polysaccharide, tryptophan, and casein. Methanogens metabolized most of the polysaccharide, the whole tryptophan content, and part of the casein, leading to the presence of humic acid and protein in effluent. After Ni(II) dosage, the protein and polysaccharide of the acid phase increased, and tryptophan changed, while casein remained stable. More protein than polysaccharide was produced, suggesting the prominent function of protein when addressing the negative effect of toxic metals. The analysis of DNA confirmed the change of bacterial activity. 关 键 词：有机物降解 厌氧反应器 微生物产物 SMP NI 溶解性 蛋白多糖 镍(Ⅱ)
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