Effects of ozonation and coagulation on effluent organic matter characteristics and ultrafiltration membrane fouling

Effluent organic matter （EfOM） is the major cause of fouling in the low pressure membranes process for wastewater reuse. Coagulation and oxidation of biological wastewater treatment effluent have been applied for the fouling control of microfiltration membranes. However, the change in EfOM structure...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2014-06, Vol.26 (6), p.1325-1331
Main Authors: Jeong, Kwon, Lee, Dae-Sung, Kim, Do-Gun, Ko, Seok-Oh
Format: Article
Language:English
Subjects:
acidity
Chromatography, Gel
Coagulation
effluent organic matter
Effluents
Flocculation
Fluorescence
Flux
Fouling
Membranes
Membranes, Artificial
molecular weight distribution
Organic Chemicals - analysis
oxidation
Ozone - chemistry
Reduction
Spectrometry, Fluorescence
Spectrophotometry
Ultrafiltration
Water Quality
尺寸排阻色谱法
平均分子量
废水回用
有机物
混凝
特性
臭氧氧化
超滤膜污染
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Summary:Effluent organic matter （EfOM） is the major cause of fouling in the low pressure membranes process for wastewater reuse. Coagulation and oxidation of biological wastewater treatment effluent have been applied for the fouling control of microfiltration membranes. However, the change in EfOM structure by pre-treatments has not been clearly identified. The changes of EfOM characteristics induced by coagulation and ozonation were investigated through size exclusion chromatography, UV/Vis spectrophotometry, fluorescence spectrophotometry and titrimetric analysis to identify the mechanisms in the reduction of ultrafiltration （UF） membrane fouling. The results indicated that reduction of flux decline by coagulation was due to modified characteristics of dissolved organic carbon （DOC） content. Total concentration of DOC was not reduced by ozonation. However, the mass fraction of the molecules with molecular weight larger than 5 kDa, fluorescence intensity, aromaticity, highly condensed chromophores, average molecular weight and soluble microbial byproducts decreased greatly after ozonation. These results indicated that EfOM was partially oxidized by ozonation to low molecular weight, highly charged compounds with abundant electron- withdrawing functional groups, which are favourable for alleviating UF membrane flux decline.
ISSN:1001-0742
1878-7320
DOI:10.1016/S1001-0742(13)60607-5