Cyanobacterial bloom mitigation using proteins with high isoelectric point and chitosan-modified soil

Li, L. and Pan, G. ORCID: 0000-0003-0920-3018, 2016. Cyanobacterial bloom mitigation using proteins with high isoelectric point and chitosan-modified soil. Journal of Applied Phycology, 28 (1), pp. 357-363. ISSN 0921-8971

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Abstract

A new environmental friendly method was developed for cyanobacterial blooms mitigation using local lake shore soil modified by protein with high isoelectric point (pI) and chitosan jointly. Results suggested that 5 mg/L lysozyme (pI ≈ 11) and 100 mg/L bromelain (pI ≈ 9.5) modified 10 mg/L soil can both reduce the surface charge of microcystis aeruginosa, the dominant species forming cyanobacterial blooms, from -26 mv to -10 mv and remove 73% and 60% of algal cells in 30 min, respectively. The limited improvement of removal efficiency was due to the small flocs (< 60 μm) formed by charge neutralization, which need more than 90 min to settle in static condition. However, when the small flocs were linked and bridged by the other modifier, chitosan with long polymer chain, large flocs of about 800 μm and 300 μm were fomed and more than 80% of algal cells were removed in 5 min and 30 min by lysozyme-chitosan modified soil and bromelain-chitosan modified soil, respectively. The lower removal ability of bromelain-modified soil was due to the lower charge density leading to less powerful in destabilization of algal cells. Depending on the bi-component modification mechanism including charge neutralization of proteins with high pI and netting and bridging function of chitosan with long polymer chain, it is possible to flocculate cyanobacterial blooms in natural waters effectively using locally available materials.

Item Type: Journal article
Alternative Title: Cyanobacterial blooms mitigation using proteins with high isoelectric point and chitosan modified soil
Publication Title: Journal of Applied Phycology
Creators: Li, L. and Pan, G.
Publisher: Springer
Date: 6 May 2016
Volume: 28
Number: 1
ISSN: 0921-8971
Identifiers:
NumberType
10.1007/s10811-015-0598-1DOI
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Linda Sullivan
Date Added: 13 Jun 2016 09:47
Last Modified: 10 Oct 2017 14:17
URI: http://irep.ntu.ac.uk/id/eprint/27968

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