IC反应器处理制药废水的颗粒污泥驯化和快速启动

试验研究了厌氧内循环(IC)反应器处理化工合成制药废水时,颗粒污泥的驯化培养启动过程.IC反应器控制在中温条件运行,接种颗粒污泥取自处理味精废水的厌氧上升流式污泥床反应器,驯化开始采用葡萄糖基质与制药废水混合废水,然后很快转化为全部是生物难降解的合成制药废水.结果表明,采用高负荷、高进水浓度的启动控制条件,经历23d的启动运行,IC反应器的容积负荷达到5 kgCOD/(m3·d), COD去除率达到70%~80%.在容积负荷达到7.4kgCOD/(m3·d)时,COD的去除率仍可稳定在70%左右.IC反应器中的成熟颗粒污泥形状规则、密实、粒径大.扫描电镜观察发现,颗粒污泥中古细菌产甲烷鬓毛菌(Methanosaetaceae)占优势. IC反应器处理难降解废水在高负荷、高进水浓度条件下可实现快速培养驯化和启动.

Granular sludge acclimation and quick startup of pharmaceutical wastewater with an IC reactor

Granular sludge acclimation and quick startup of a lab-scale internal circulation anaerobic (IC) reactor, treating a chemical synthesis-based pharmaceutical wastewater were evaluated. The reactor was operated under mesophilic conditions. The seeding granular sludge originated from an up-flow anaerobic sludge blanket reactor treating monosodium glutamate (MSG) wastewater. The acclimation period lasted 23 d with high strength influent and high organic loading rates (OLR). In this period, glucose substrate was mixed with pharmaceutical wastewater and the mixture gradually changed into refractory full-pharmaceutical wastewater rapidly. Granular sludge acclimation was achieved with COD removal efficiency of 70%~80% and organic loading rates of 5 kgCOD/(m3·d). The COD removal efficiency was stabilized at about 70% when the OLR increased to 7.4 kgCOD/(m3·d). Mature granular sludge was dense, regular and with large size. The dominant archaea in the mature granular samples was Methanosaetaceae using scanning electron microscope. Quick acclimation and startup of the IC reactor which was used to treat refractory wastewater were achieved using high strength influent and high organic loading rates.