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Transformation of dissolved organic matter during full-scale treatment of integrated chemical wastewater: Molecular composition correlated with spectral indexes and acute toxicity
Zhang, Bingliang; Shan, Chao; Hao, Zhineng; Liu, Jingfu; Wu, Bing; Pan, Bingcai
2019-06-15
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume157Pages:472-482
AbstractAs one of the key economic modes in China, chemical industry park (CIP) has made great contribution to the Chinese rapid economic growth. Concomitantly, how to effectively and safely dispose of the CIP wastewater (CIPWW) has been an unavoidable issue. Molecular transformation of dissolved organic matter (DOM) in CIPWW treatment is essential to optimize the employed process and to provide solid basis for risk evaluation of the discharged effluent as well. In this study, electrospray ionization coupled with Fourier transform ion cyclotron resonance mass spectrometry (ESI-FT-ICR-MS) was used to characterize the molecular transformation of DOM during full-scale treatment of integrated chemical wastewater in a centralized wastewater treatment plant (CWWTP), where the combined process follows hydrolysis/acidification (HA)-flocculation/precipitation (FP)-A(2)/O-membrane bioreactor (MBR)-ultrafiltration (UF)-reverse osmosis (RO). Compared to municipal wastewater, DOM in CIPWW exhibited higher unsaturation degree, lower molecular weight, and higher toxicity. In FP unit, DOM of C-<24 and higher nominal oxidation state of carbon (NOSC) values was preferentially removed. The HA and anaerobic units are capable of significantly degrading DOM, resulting in great changes in molecular composition of DOM. However, the anoxic, oxic, and MBR units only lead to a slight change of the molecular formulae. The terminal units of OF and RO can remove most DOM, with the concentration of dissolved organic carbon (DOC) declining by 19.2% and 94.6% respectively. The correlation between spectral indexes and acute toxicity with the molecular formulae of DOM suggested that polyphenols and highly unsaturated phenols were positively correlated with the specific UV absorbance at 254 nm (SUVA(254)). In addition, both compounds (0.32 < O/C < 0.63) as well as the aliphatic ones (0.22 < O/C < 0.56) presented positive correlation with acute toxicity. Further, the pairwise correlation analysis illustrated that SUVA(254), O/C-wa, double bond equivalence (DBEwa), and NOSCwa were positively correlated with each other, whereas the acute toxicity was positively correlated with humification index (HIX), O/C-wa, and DBEwa. (C) 2019 Elsevier Ltd. All rights reserved.
Department环境化学与生态毒理学国家重点实验室
KeywordChinese chemical industry park Wastewater Dissolved organic matter FT-ICR-MS Spectral indexes Acute toxicity
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43046
Collection环境化学与生态毒理学国家重点实验室
Affiliation1.Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China
2.Nanjing Univ, Res Ctr Environm Nanotechnol ReCENT, Nanjing 210023, Jiangsu, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, POB 2871, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Bingliang,Shan, Chao,Hao, Zhineng,et al. Transformation of dissolved organic matter during full-scale treatment of integrated chemical wastewater: Molecular composition correlated with spectral indexes and acute toxicity[J]. WATER RESEARCH,2019,157:472-482.
APA Zhang, Bingliang,Shan, Chao,Hao, Zhineng,Liu, Jingfu,Wu, Bing,&Pan, Bingcai.(2019).Transformation of dissolved organic matter during full-scale treatment of integrated chemical wastewater: Molecular composition correlated with spectral indexes and acute toxicity.WATER RESEARCH,157,472-482.
MLA Zhang, Bingliang,et al."Transformation of dissolved organic matter during full-scale treatment of integrated chemical wastewater: Molecular composition correlated with spectral indexes and acute toxicity".WATER RESEARCH 157(2019):472-482.
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