Impact of algal organic matter on the performance, cyanotoxin removal, and biofilms of biologically-active filtration systems
| Autor: | Youngwoo Seo, Hodon Ryu, Jose Calvillo, Lei Li, Youchul Jeon, Onekyun Choi, Jess Brown, Jorge W. Santo Domingo |
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| Rok vydání: | 2020 |
| Předmět: |
Cyanobacteria
Environmental Engineering Microcystins Harmful Algal Bloom 0208 environmental biotechnology 02 engineering and technology Microcystin 010501 environmental sciences 01 natural sciences Algal bloom Article Water Purification otorhinolaryngologic diseases Organic matter Saprospiraceae Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering chemistry.chemical_classification biology Chemistry Ecological Modeling Biofilm Cyanotoxin biology.organism_classification Pollution 020801 environmental engineering Microbial population biology Biofilms Environmental chemistry Filtration |
| Zdroj: | Water Res |
| ISSN: | 0043-1354 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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