Impact of algal organic matter on the performance, cyanotoxin removal, and bio fi lms of biologically-active fi ltration systems

WATER RESEARCH

卷:184

Article

Jeon, Youchul¹  Li, Lei¹  Calvillo, Jose²  Ryu, Hodon³  Domingo, Jorge W. Santo³  Choi, Onekyun¹  Brown, Jess⁴  Seo, Youngwoo^1,2 

[1] Univ Toledo, Dept Civil & Environm Engn, Mail Stop 307,3006 Nitschke Hall, Toledo, OH 43606 USA

[2] Univ Toledo, Dept Chem & Engn, Mail Stop 307,3048 Nitschke Hall, Toledo, OH 43606 USA

[3] US EPA, Water Infrastruct Div, Ctr Environm Solut & Emergency Response, Cincinnati, OH 45268 USA

[4] Carollo Engineers Res & Dev Practice, Costa Mesa, CA 92626 USA

关键词: Algal organic matter (AOM);    Microcystin;    Biologically-active filtration;    Biofilm;    Excitation-emission matrix (EEM);    Microbial community structure;   

DOI  :  10.1016/j.watres.2020.116120

来源: Elsevier

【 摘 要 】

The occurrence of harmful algal blooms dominated by toxic cyanobacteria has induced continuous loadings of algal organic matter (AOM) and toxins in drinking water treatment plants. However, the impact of AOM on the active biofilms and microbial community structures of biologically-active filtration (BAF), which directly affects the contaminant removal, is not well understood. In this study, we sys-tematically examined the effects of AOM on BAF performance and bacterial biofilm formation over 240 days, tracing the removal of specific AOM components, a cyanotoxin [microcystin-LR (MC-LR)], and microbial community responses. The component analysis (excitation and emission matrix analysis) results for AOM revealed that terrestrial humic-like substances showed the highest removal among all the identified components and were strongly correlated to MC-LR removal. In addition, reduced empty bed contact time and deactivation of biofilms significantly decreased BAF performances for both AOM and MC-LR. The active biofilm, bacterial community structure, and mlrA gene (involved in microcystin degradation) abundance demonstrated that bacterial biofilm composition responded to AOM and MC-LR, in which Rhodocyclaceae, Saprospiraceae, and Comamonadaceae were dominant. In addition, MC-LR biodegradation appeared to be more active at the top than at the bottom layer in BAF. Overall, this study provides deeper insights into the role of biofilms and filter operation on the fate of AOM and MCLR in BAF. (c) 2020 Elsevier Ltd. All rights reserved.

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