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化工学报  2015 

水力停留时间对双循环厌氧反应器处理中药废水污泥特性的影响

DOI: 10.11949/j.issn.0438-1157.20141882, PP. 1897-1903

Keywords: 厌氧,生物反应器,废水,水力停留时间,颗粒污泥,胞外聚合物

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Abstract:

研究了不同水力停留时间(HRT,24h、18h、15h、12h)对双循环(DC)厌氧反应器处理中药废水效能的影响,并对颗粒污泥的粒径分布(PSD)、胞外聚合物(EPS)、微生物群落等变化情况进行了分析。结果表明,HRT由24h缩短为12h后,DC厌氧反应器对COD的去除率仍在90%以上。虽然出水中乙酸含量升高到339.69mg·L-1,但未造成VFA的过度累积;出水中辅酶的荧光吸收峰有所降低,而类腐殖酸与类富里酸的吸收峰增强,不适宜再继续降低HRT。随着HRT的缩短,颗粒污泥的EPS总量、蛋白含量、多糖含量均降低,其中酪氨酸对于保持污泥的稳定性发挥着重要作用。而磷脂脂肪酸分析(PLFA)表明,HRT缩短对于DC厌氧反应器第2反应区内微生物群落分布影响显著,革兰阳性菌由原来占总脂肪酸生物量的44.24%下降到32.69%,而革兰阴性菌由32.69%增大到38.66%。

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