Removal of cyanobacteria from a water supply reservoir by sedimentation using flocculants and suspended solids as ballast: Case of Legedadi Reservoir (Ethiopia)
نویسندگان
چکیده
The massive growth of potentially toxic cyanobacteria in water supply reservoirs, such as Legedadi Reservoir (Ethiopia), poses a huge burden to purification units and represents serious threat public health. In this study, we evaluated the efficiency flocculants/coagulants chitosan, Moringa oleifera seed (MOS), poly-aluminium chloride (PAC) settling cyanobacterial species present Reservoir. We also tested whether coagulant-treated reservoir promotes growth. Our data showed that suspended solids turbid acted ballast, thereby enhancing hence removal coagulated with seed, or their combination. Compared other coagulants, MOS 30 mg/L concentration, 93.6%, was most effective removing without causing cell lysis. Contrary our expectation, PAC least coagulant. Moreover, treated alone combined chitosan did not support any during first two weeks experiment. indicate efficacy flocculant/coagulant is influenced by uniqueness individual lakes/reservoirs, implying mitigation methods should consider unique characteristic lake/reservoir.
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ژورنال
عنوان ژورنال: PLOS ONE
سال: 2021
ISSN: ['1932-6203']
DOI: https://doi.org/10.1371/journal.pone.0249720