Flocculation and lysis of Microcystis aeruginosa by Paebubacillus sp. A9 and inhibition of microcystin release

Jia, Liping; Cheng, Xuelin; Fang, Linchuan; Huang, Xuguang

doi:10.1016/j.eti.2023.103152

Cited by 7 publications

(1 citation statement)

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“…Initially, polysaccharides with a series of carboxyl groups released by A9 caused flocculation of Microcystis aeruginosa cells, which was followed by the lysis of algal cells by the algicidal active compounds present in the A9 culture. The algicidal process activated the antioxidant system of Microcystis aeruginosa, as evidenced by a dramatic increase in the activities of catalase (CAT) and superoxide dismutase (SOD) enzyme [28]. Liu et al (2023) verified the algicidal efficacy of Brevibacillus sp.…”

Section: Introductionmentioning

confidence: 85%

Changes in Extracellular Microcystins (MCs) Accompanying Algae/Cyanobacteria Removal during Three Representative Algae/Cyanobacteria Inactivation Processes and an MC Diffusion Model in Still Water

Shi,

Fang,

et al. 2023

Water

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This study addresses the lack of comparative research on algae/cyanobacteria elimination technologies in the existing literature. Our investigation focused on evaluating the performance of three commonly used algae/cyanobacteria removal processes: ultrasound (20.8 kHz), copper sulfate and biotic algicide (Bacillus subtilis). The evaluation considered both algae/cyanobacteria removal efficacy and the consequent changes in extracellular microcystins (MCs). To achieve this, we employed real eutrophic water as the test water. The ultrasound treatment demonstrated effective algae/cyanobacteria removal, with an average rate of algae/cyanobacteria decreasing (RAD) ranging from 0.50 to 0.99 µg chlorophyll a per liter per minute (µg chlorophyll a/L·min). On the other hand, the copper sulfate and biotic algicide treatments exhibited relatively lower rates of algae/cyanobacteria removal, with average RAD values of 0.21 to 0.38 µg chlorophyll a per liter per day (µg chlorophyll a/L·d) and 0.10 to 0.13 µg chlorophyll a per liter per day (µg chlorophyll a/L·d), respectively. Moreover, we observed significant increases in extracellular MCs in the ultrasound and copper sulfate treatments. The corresponding values of the increment of extracellular MCs accompanying removal per microgramme (µg) chlorophyll a (IEMARMC) were 0.34 to 2.43 µg MCs per µg chlorophyll a (µg MCs/µg chlorophyll a) and 18.13 to 185.08 µg MCs per µg chlorophyll a (µg MCs/µg chlorophyll a), respectively. However, in certain conditions where sufficient dosages (0.5 to 2 mg/L) and reaction time (≥8 days) are provided, the biotic algicide treatment could result in a decrease in MCs compared to an untreated control group (IEMARMC: −43.94 to −32.18 µg MCs per µg chlorophyll a). This suggests that the biotic algicide effectively degraded the MCs. In addition, we developed a one-dimensional MC diffusion model in still water based on Newton’s second law, which exhibits excellent simulation capabilities.

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Section: Introductionmentioning

confidence: 85%