Liébana Raquel, Modin Oskar, Persson Frank, Hermansson Malte, Wilén Britt-Marie
Division of Water Environment Technology, Department of Architecture and Civil Engineering, Chalmers University of Technology, Sven Hultins gata 6, SE 412 96, Gothenburg, Sweden.
AZTI, Marine Research Division, Basque Research Technology Alliance (BRTA), Txatxarramendi Ugartea z/g, 48395, Sukarrieta, Bizkaia, Spain.
Biofilm. 2023 Jul 28;6:100145. doi: 10.1016/j.bioflm.2023.100145. eCollection 2023 Dec 15.
Granular sludge is a biofilm process used for wastewater treatment which is currently being implemented worldwide. It is important to understand how disturbances affect the microbial community and performance of reactors. Here, two acetate-fed replicate reactors were inoculated with acclimatized sludge and the reactor performance, and the granular sludge microbial community succession were studied for 149 days. During this time, the microbial community was challenged by periodically removing half of the reactor biomass, subsequently increasing the food-to-microorganism (F/M) ratio. Diversity analysis together with null models show that overall, the microbial communities were resistant to the disturbances, observing some minor effects on polyphosphate-accumulating and denitrifying microbial communities and their associated reactor functions. Community turnover was driven by drift and random granule loss, and stochasticity was the governing ecological process for community assembly. These results evidence the aerobic granular sludge process as a robust system for wastewater treatment.
颗粒污泥是一种用于废水处理的生物膜工艺，目前正在全球范围内实施。了解干扰如何影响微生物群落和反应器性能非常重要。在此，用驯化污泥接种了两个以乙酸盐为食的重复反应器，并对反应器性能和颗粒污泥微生物群落演替进行了149天的研究。在此期间，通过定期去除一半的反应器生物量，随后提高食物与微生物（F/M）比，对微生物群落进行了挑战。多样性分析与零模型表明，总体而言，微生物群落对干扰具有抗性，对聚磷积累和反硝化微生物群落及其相关反应器功能观察到一些轻微影响。群落周转由漂移和随机颗粒损失驱动，随机性是群落组装的主导生态过程。这些结果证明好氧颗粒污泥工艺是一种稳健的废水处理系统。
