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Cho, Jaeweon
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Role of coagulation in membrane filtration of wastewater for reuse

Author(s)
Kim, SHMoon, SYYoon, CHYim, SKCho, JW
Issued Date
2005-03
DOI
10.1016/j.desal.2004.08.036
URI
https://scholarworks.unist.ac.kr/handle/201301/11899
Fulltext
http://www.sciencedirect.com/science/article/pii/S0011916404007258#
Citation
DESALINATION, v.173, no.3, pp.301 - 307
Abstract
This study explains the role of coagulation in membrane filtration of wastewater for reuse. For this purpose, a coagulation-ultrafiltration (UF) membrane system was used to treat secondary effluent from a nearby wastewater treatment plant using a rotating biological contactor. The study proceeded with the hypothesis that coagulation could affect membrane filtration through two phenomena: change in particle characteristics and contaminant loading reduction. If fouling reduction were observed at a low alum dosage, coagulation would affect membrane performance by changing particle characteristics because contaminant reduction could not be possible at low dosage. If fouling reduction were observed only at a high alum dosage, the role of coagulation would be contaminant loading reduction. Results showed that both phenomena were important. Coagulation improved the membrane performance by changing particle characteristics at a low alum dosage. The improvement was achieved through both a change in particle characteristics and contaminant loading reduction at a high alum dosage. Particle size among various characteristics was found the most important for membrane fouling. Coagulation increased particle size, which led to a reduction of fouling. The beneficial effect from coagulation was observed at both fouling steps of pore blocking/adsorption and cake formation. Coagulation pretreatment was also beneficial for the improvement of the permeate quality in terms of organic matter
Publisher
ELSEVIER SCIENCE BV
ISSN
0011-9164
Keyword (Author)
coagulation pretreatmentwastewater reuseultrafiltrationparticle size

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