Removal of Microcystis aeruginosa using cationic starch modified soils

Shi, W, Tan, W, Wang, L and Pan, G ORCID: 0000-0003-0920-3018, 2016. Removal of Microcystis aeruginosa using cationic starch modified soils. Water Research, 97, pp. 19-25. ISSN 0043-1354

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Abstract

A cheap and biodegradable modifier, cationic starch (CS), was used to turn local soils into effective flocculants for Microcystis aeruginosa (M. aeruginosa) removal. The isoelectric point of soil particles was remarkably increased from pH 0.5 to 11.8 after modification with CS, which made CS modified soil particles positively charged and obtain algal flocculation ability. At the soil concentration of 100 mg/L, when the CS modifier was 10 mg/L, 86% of M. aeruginosa cells were removed within 30 min. Lower or higher CS dosage led to limited algal removal. About 71% and 45% of M. aeruginosa cells were removed within 30 min when CS was 5 mg/L and 80 mg/L, respectively. This is because only part of algal cells combined with CS modified soil particles through charge neutralization at low dosage, while flocs formed at high CS dosage were positively charged which prevents further aggregation among the flocs. The floc stability was quantified by a floc breakage index under applied shear force. Algal flocs formed at acid and alkaline conditions were more prone to be broken than those at the neutral condition. The cost and biodegradability concerns may be largely reduced through the use of CS modified local soils. For field applications, other practical issues (e.g., re-suspension) should be further studied by jointly using other methods

Item Type: Journal article
Publication Title: Water Research
Creators: Shi, W., Tan, W., Wang, L. and Pan, G.
Publisher: Elsevier
Date: 15 June 2016
Volume: 97
ISSN: 0043-1354
Identifiers:
NumberType
10.1016/j.watres.2015.06.029DOI
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Linda Sullivan
Date Added: 11 May 2016 14:52
Last Modified: 09 Jun 2017 14:02
URI: http://irep.ntu.ac.uk/id/eprint/27772

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