State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Eur J Protistol. 2013 Nov;49(4):491-9. doi: 10.1016/j.ejop.2013.03.001. Epub 2013 Apr 28.
We investigated the dynamics of the microfauna community in activated sludge, with special reference to sludge bulking, in two parallel municipal wastewater treatment systems in Beijing, China over a period of 14 months. Annual cyclic changes in microfauna community structures occurred in both systems. RELATE analysis based on Spearman's Rank correlation indicated that microfauna community structures were highly correlated with the sludge volume index (SVI) (p<0.001), which indicates sludge settleability. Nutrient conditions of raw sewage (p<0.01) and hydraulic retention time (HRT) (p<0.05) were also related to microfauna community structures. Abundances of the species Epistylis plicatilis and Vorticella striata increased significantly with an increase in SVI (p<0.001) and decrease in water temperature (p<0.001), suggesting that sludge bulking may have created favorable conditions for the two species, even under unfavorable temperature conditions. Sludge de-flocculation primarily due to the excessive growth of Microthrix parvicella-like filaments could be an important driving force for the microfauna community changes. The release of flocculated non-filamentous bacteria may represent a suitable food source for these species. The two species may be considered as potential bioindicators for sludge bulking.
我们调查了活性污泥中微型动物群落的动态，特别是在北京的两个平行的城市污水处理系统中，特别关注污泥膨胀问题，为期 14 个月。两个系统的微型动物群落结构都发生了年度周期性变化。基于 Spearman 等级相关的 RELATE 分析表明，微型动物群落结构与污泥体积指数（SVI）高度相关（p<0.001），这表明了污泥的沉降性能。原污水的营养条件（p<0.01）和水力停留时间（HRT）（p<0.05）也与微型动物群落结构有关。Epistylis plicatilis 和 Vorticella striata 的丰度随着 SVI 的增加（p<0.001）和水温的降低（p<0.001）而显著增加，这表明即使在不利的温度条件下，污泥膨胀也可能为这两个物种创造了有利的条件。污泥解絮主要是由于 Microthrix parvicella 样丝状菌的过度生长，可能是微型动物群落变化的一个重要驱动力。絮凝非丝状细菌的释放可能代表这些物种的合适食物来源。这两个物种可以被认为是污泥膨胀的潜在生物指标。
