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Potential of coagulation/GAC adsorption combined with UV/H 2 O 2 and ozonation for removing dissolved organic matter from secondary RO concentrate
Author(s) -
Zhang Xian,
Lin Jiuyang,
Ye Wenyuan,
Zhou Wei,
Jia Xuxiang,
Zhao Shuaifei,
Ye Chunsong
Publication year - 2019
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5856
Subject(s) - adsorption , coagulation , organic matter , chemistry , environmental chemistry , dissolved organic carbon , ozone , organic chemistry , psychology , psychiatry
BACKGROUD Organic contaminants in secondary reverse osmosis (SRO) concentrate pose a severe threat to the ecosystem, due to their potential toxicity. In this study, potential of coagulation/granular activated carbon (GAC) adsorption combined with UV/H 2 O 2 and ozonation for removing organic matter from industrial secondary RO concentrate was systematically investigated. RESULTS Coagulation with 2.0 mmol L −1 FeCl 3 yielded 40% removal of dissolved organic carbon (DOC), while adsorption with 5 g L −1 GAC could boost the removal efficiency up to 78.2%. Fractionation results showed that both coagulation and GAC adsorption favored hydrophobic organics. UV/H 2 O 2 oxidation was capable of removing 87.4% of DOC, which outperformed ozonation (58.2%). UV/H 2 O 2 and ozonation showed similar behavior in dissolved organic matter (DOM) degradation: a portion of hydrophobic organics were first transformed into hydrophilic fractions prior to final mineralization. Conclusion Coupling of GAC as post‐treatment with a UV/H 2 O 2 process yielded 97.9% removal of DOC and the corresponding electrical energy per order (EE/O) was decreased from 66.7 to 35.8 kWh m −3 . Consequently, a simple UV/H 2 O 2 and GAC hybrid process was proposed to be a suitable method for removing DOM from SRO concentrate. © 2018 Society of Chemical Industry