Effect of algal flocculation on dissolved organic matters using cationic starch modified soils

Shi, W., Bi, L. and Pan, G. ORCID: 0000-0003-0920-3018, 2016. Effect of algal flocculation on dissolved organic matters using cationic starch modified soils. Journal of Environmental Sciences. ISSN 1001-0742

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Abstract

Modified soils are being increasingly used as geo-engineering materials for the sedimentation removal of cyanobacterial blooms. However, when organic flocculants were used as soil modifiers, little is known about the potential impacts of these materials on the treated water. This study investigated dissolved organic matters in the bloom water after algal removal using cationic starch modified soils (CS-MS). Results showed that the dissolved organic carbon (DOC) could be decreased by CS-MS flocculation and the use of higher charge density CS yielded a greater DOC reduction. When CS with the charge density of 0.052, 0.102 and 0.293 meq/g were used, dissolved organic carbon (DOC) was decreased from 3.4 to 3.0, 2.3 and 1.7 mg/L, respectively. The excitation-emission matrix fluorescence spectroscopy and UV254 analysis indicated that CS-MS exhibits an ability to remove some soluble organics, which contributed to the DOC reduction. However, the use of low charge density CS posed a potential risk of DOC increase due to the high CS loading for effective algal removal. When CS with the charge density of 0.044 meq/g was used, DOC was increased from 3.4 to 3.9 mg/L. This study suggested that by optimizing charge density of CS, the use of organic MS-CS flocculants can achieve the sedimentation removal of cyanobacterial cells without increasing the content of dissolved organic matters in bloom waters. For the settled organic matters, other measures (e.g., capping treatments using oxygen loaded materials) should be jointly applied after algal flocculation.

Item Type: Journal article
Publication Title: Journal of Environmental Sciences
Creators: Shi, W., Bi, L. and Pan, G.
Publisher: Elsevier
Date: 2016
ISSN: 1001-0742
Identifiers:
NumberType
10.1016/j.jes.2015.12.018DOI
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Linda Sullivan
Date Added: 11 May 2016 14:15
Last Modified: 09 Jun 2017 14:02
URI: http://irep.ntu.ac.uk/id/eprint/27768

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