Advanced Processes of Cyanobacteria and Cyanotoxins Removal in Supply Water Treatment
Camacho, F.
Bongiovani, M.
Arakawa, F.S.
Shimabuku, Q.L.
Vieira, A.M.S.
Bergamasco, R.
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How to Cite

Camacho F., Bongiovani M., Arakawa F., Shimabuku Q., Vieira A., Bergamasco R., 2013, Advanced Processes of Cyanobacteria and Cyanotoxins Removal in Supply Water Treatment, Chemical Engineering Transactions, 32, 421-426.
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Abstract

The efficiency of Moringa oleifera (MO) seeds as a natural coagulant in the coagulation/flocculation process, followed by nanofiltration (NF) for the removal of cyanobacterial cells and cyanotoxins is investigated. "Synthetic water" prepared for the tests comprised de-ionized water with an inoculum of microcystis protocystis cells to obtain turbidity within the 50-450 NTU range. Methodology followed two steps: 1) coagulation/flocculation/sedimentation (C/F/S) process using MO extracted in a saline solution of potassium chloride (KCl-1M) as coagulant to determine best dosage; 2) nanofiltration process using NF-90 and NF-270 membranes, with slightly different characteristics. A 5 bar working pressure was applied. Physical, chemical (color, turbidity and pH) and microbiological (cyanobacterial cells count and microcystin concentration) parameters were analyzed in all samples. Current study shows that, as a natural coagulant, MO seeds provided satisfactory results in M. protocystis, color and turbidity removal and did not cause cell lysis. NF completely removed cyanobacterial cells and microcystins (100%) from M. protocystis (within the quantification limits). Results show that C/F/S+NF sequence is a safe barrier against M.protocystis and microcystins in drinking water.
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