Assessment of the factors contributing to the variations in microcystins biodegradability of the biofilms on a practical biological treatment facility. (January 2015)

• Record Type: Journal Article
• Authors: Li, Jieming; Shimizu, Kazuya; Akasako, Haruna; Lu, Zhijiang; Akiyama, Shohei; Goto, Masafumi; Utsumi, Motoo; Sugiura, Norio
• Is Part Of: Bioresource technology. Volume 175(2015)
• Page Start: 463
• Page End: 472
• Publication Date: 2015-01
• Subjects: CBs cyanobacterial blooms -- MCs microcystins -- MCLR microcystin-LR -- WTP water treatment plant -- BTF biological treatment facility -- BT tank biological treatment tank -- qPCR quantitative polymerase chain reaction -- MCRR microcystin-RR -- MCYR microcystin-YR -- RW receiving well -- DO dissolved oxygen -- f.c. final concentration -- HPLC high performance liquid chromatography; Biodegradation -- Biofilm -- Microcystin -- mlrA gene -- Seasonal variation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2014.10.047
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Dynamics in microcystin-biodegradability depend on microcystin-degrader biomass. Degrader abundance relates to water temperature, microcystin and chlorophyll-a amount. The peaks of degrader biomass and biodegradation follow peaks of some abiotic factors. No difference exists in separate and concurrent biodegradation of microcystin analogs. Microcystin-degraders proliferate to varied extents along biodegradation processes. Abstract: This study revealed the biotic and abiotic parameters driving the variations in microcystins (MCs) biodegradability of a practical biological treatment facility (BTF). Results showed that similar trends of seasonal variation were seen for microcystin-LR (MCLR) biodegradability of biofilms on the BTF and indigenous MCLR-degrader population, where both peaks co-occurred in October, following the peaks of natural MCLR concentration and water temperature observed in August. The lag period might be required for accumulation of MCLR-degraders and MCLR-degrading enzyme activity. The MCLR-degrader population was correlated to temperature, MCLR and chlorophyll-a concentration in water where the biofilms submerged, indicating that these abiotic and biotic parameters exerted direct and/or indirect influences on seasonal variation in MCLR-biodegradability. In comparison, no effect of other co-existing MCs on biodegradation of one MC was observed. However, proliferation of MC-degraders along biodegradation processes positively responded to total amount of MCs, suggesting that multiple MCs contributed additively to MC-degrader proliferation.