盐度对EGSB反应器的运行及厌氧颗粒污泥的影响

发布时间：2018-11-15 21:50

【摘要】：高盐废水通常含有高COD浓度,难以处理,引用具有耐盐性能的生物反应器处理高盐废水成为必要.使用模拟高盐废水在3.267 kg·(m~3·d)~(-1)的COD容积负荷下,将Cl~-浓度逐步从0提升至10 000 mg·L~(-1),研究盐度对膨胀颗粒污泥床(expanded granular sludge bed,EGSB)反应器的影响.结果表明,Cl~-浓度小于7 500 mg·L~(-1)时,对微生物的抑制作用较低;Cl~-浓度为7 500 mg·L~(-1)时,反应器的COD去除率能保持在98.1%左右,容积产气率能够基本保持在1.3 m~3·(m~3·d)~(-1)以上,大粒径的厌氧颗粒污泥仍然占据体系的主体;当Cl~-浓度为10 000 mg·L~(-1)时,反应器中的厌氧颗粒污泥受到严重影响.采用高通量测序技术对0和5 000 mg·L~(-1)两个Cl~-浓度下的厌氧颗粒污泥的微生物菌群结构进行分析,结果表明,盐度影响了微生物的种群分布,在5 000 mg·L~(-1)的Cl~-浓度下,主要的优势菌属由Cl~-浓度为0时的Methanoregula与Longilinea变为Methanobacterium、Methanospirillum、Methanothrix和Paludibacter.
[Abstract]:High salt wastewater usually contains high concentration of COD, so it is necessary to treat high salt wastewater with salt tolerant bioreactor. Using simulated high-salt wastewater at 3.267 kg (M3 d) ~ (-1) COD volumetric loading, the concentration of Cl~- was gradually raised from 0 to 10 000 mg L-1. The effect of salinity on (expanded granular sludge bed, of bulking granular sludge bed was studied. Effect of EGSB) reactor. The results showed that when the concentration of Cl~- was less than 7 500 mg L ~ (-1), the inhibition of microorganism was low. When the concentration of Cl~- is 7 500 mg L ~ (-1), the removal rate of COD can be maintained at 98.1%, and the volumetric gas yield can be kept above 1.3 mm3 (m ~ (3 d) ~ (-1). The large size of anaerobic granular sludge still occupied the main part of the system. When the concentration of Cl~- was 10 000 mg L ~ (-1), the anaerobic granular sludge in the reactor was seriously affected. The microbial community structure of anaerobic granular sludge at 0 and 5 000 mg L ~ (-1) Cl~- concentrations was analyzed by high-throughput sequencing technique. The results showed that salinity affected the distribution of microbial population. At the concentration of 5 000 mg L ~ (-1) Cl~-, the dominant bacteria changed from Methanoregula and Longilinea to Methanobacterium,Methanospirillum,Methanothrix and Paludibacter. when Cl~- concentration was 0.
【作者单位】：四川大学建筑与环境学院;
【基金】：四川省科技厅科技支撑计划项目(2015SZ0009)
【分类号】：X703.1

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