Details

Autor(en) / Beteiligte

• Jeon, Youchul
• Li, Lei
• Calvillo, Jose
• Ryu, Hodon
• Santo Domingo, Jorge W.
• Choi, Onekyun
• Brown, Jess
• Seo, Youngwoo

Titel

Impact of algal organic matter on the performance, cyanotoxin removal, and biofilms of biologically-active filtration systems

Ist Teil von

• Water research (Oxford), 2020-10, Vol.184, p.116120-116120, Article 116120

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2020

Quelle

MEDLINE

Beschreibungen/Notizen

• 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 systematically 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 MC-LR in BAF. [Display omitted] •Effects of AOM on the performance and bacterial communities of BAF were examined.•Reduced EBCT and biofilm deactivation decreased AOM and MC-LR removal in BAF.•Terrestrial humic-like substance removal was strongly correlated with MC-LR removal.•Rhodocyclaceae, Saprospiraceae, and Comamonadaceae were dominant in the presence of AOM.•MC-LR biodegradation was more active at top layers than bottom layers of BAF.