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Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations

Kavithaa Loganathan, Jayaprakash Saththasivam, Sarper Sarp Orcid Logo

Desalination, Volume: 433, Pages: 25 - 32

Swansea University Author: Sarper Sarp Orcid Logo

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Abstract

During algal bloom, it's a challenge to provide good quality feed water, and ensure sustainable RO plant operations without an adequate pre-treatment of seawater. In this paper, the effectiveness of the coagulation process with the individual and dual coagulants, using alum, FeCl3 and chitosan,...

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Published in: Desalination
ISSN: 0011-9164
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa38388
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spelling 2021-01-14T13:14:46.7568761 v2 38388 2018-02-05 Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations ca341f0a3e516f888e12d2710d06e043 0000-0003-3866-1026 Sarper Sarp Sarper Sarp true false 2018-02-05 CHEG During algal bloom, it's a challenge to provide good quality feed water, and ensure sustainable RO plant operations without an adequate pre-treatment of seawater. In this paper, the effectiveness of the coagulation process with the individual and dual coagulants, using alum, FeCl3 and chitosan, were explored aiming to remove microalgae from seawater. The coagulation-flocculation-sedimentation (C-F-S) experiments were conducted by optimizing multiple process strategies to reduce the amounts of coagulants and also to shorten the sedimentation process time. The coagulation-flocculation-dissolved air flotation (C-F-D) experiments were performed to generate the process data in order to evaluate the dual coagulation process performance of the C-F-S system. C-F-S experiments using FeCl3 coagulant gave better process performance (20 ppm FeCl3 dose, 8.2 pH, 30 min sedimentation time and 98% microalgae removal efficiency) when compared to alum and chitosan based individual coagulations. The process time of the coagulation process was significantly reduced by the addition of chitosan as a flocculent aid. For dual coagulation using alum (10 ppm) as coagulant and chitosan (1 ppm) as flocculent aid improved microalgae removal efficiency to 98% at a reduced process time of 5 min, making C-F-S process as attractive as C-F-D process. Journal Article Desalination 433 25 32 0011-9164 Harmful algal bloom (HAB); Sustainable seawater feed; Microalgae removal; Dual coagulation; Bioflocculant; Coagulation-flocculation-sedimentation process 1 5 2018 2018-05-01 10.1016/j.desal.2018.01.012 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2021-01-14T13:14:46.7568761 2018-02-05T09:22:10.8542308 College of Engineering Engineering Kavithaa Loganathan 1 Jayaprakash Saththasivam 2 Sarper Sarp 0000-0003-3866-1026 3 0038388-15022018093416.pdf loganathan2018.pdf 2018-02-15T09:34:16.5400000 Output 1724501 application/pdf Accepted Manuscript true 2019-02-02T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng
title Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations
spellingShingle Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations
Sarper Sarp
title_short Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations
title_full Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations
title_fullStr Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations
title_full_unstemmed Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations
title_sort Removal of microalgae from seawater using chitosan-alum/ferric chloride dual coagulations
author_id_str_mv ca341f0a3e516f888e12d2710d06e043
author_id_fullname_str_mv ca341f0a3e516f888e12d2710d06e043_***_Sarper Sarp
author Sarper Sarp
author2 Kavithaa Loganathan
Jayaprakash Saththasivam
Sarper Sarp
format Journal article
container_title Desalination
container_volume 433
container_start_page 25
publishDate 2018
institution Swansea University
issn 0011-9164
doi_str_mv 10.1016/j.desal.2018.01.012
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 1
active_str 0
description During algal bloom, it's a challenge to provide good quality feed water, and ensure sustainable RO plant operations without an adequate pre-treatment of seawater. In this paper, the effectiveness of the coagulation process with the individual and dual coagulants, using alum, FeCl3 and chitosan, were explored aiming to remove microalgae from seawater. The coagulation-flocculation-sedimentation (C-F-S) experiments were conducted by optimizing multiple process strategies to reduce the amounts of coagulants and also to shorten the sedimentation process time. The coagulation-flocculation-dissolved air flotation (C-F-D) experiments were performed to generate the process data in order to evaluate the dual coagulation process performance of the C-F-S system. C-F-S experiments using FeCl3 coagulant gave better process performance (20 ppm FeCl3 dose, 8.2 pH, 30 min sedimentation time and 98% microalgae removal efficiency) when compared to alum and chitosan based individual coagulations. The process time of the coagulation process was significantly reduced by the addition of chitosan as a flocculent aid. For dual coagulation using alum (10 ppm) as coagulant and chitosan (1 ppm) as flocculent aid improved microalgae removal efficiency to 98% at a reduced process time of 5 min, making C-F-S process as attractive as C-F-D process.
published_date 2018-05-01T04:05:21Z
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