Abstract |
The removal of four dissolved organic matter (DOM) fractions, non- acid hydrophobics, hydrophobic acids, hydrophilics and transphilics, was achieved by coagulation-UV/H2O2 oxidation in post- pharmaceutical wastewater (PhWW). Coagulation with Polyferric chloride (PFC), Polymeric ferric sulfate (PFS) and Polymeric aluminum ferric chloride ( PAFC) was studied separately to evaluate the effects of the initial pH and coagulant dosage. The coagulation-UV/H2O2 oxidation method resulted in much higher reduction rates for dissolved organic carbon (DOC) (by 75%) and UV254 (by 92%) than coagulation or UV/H2O2 oxidation alone. The proportion of non- acid hydrophobics, hydrophobic acids, transphilics and hydrophilics removed by coagulation was 54%, 49%, 27% and 12 %, while the combined treatment removed 92%, 87%, 70% and 39%, respectively. Parallel factor analysis (PARAFAC) of fluorescence measurements revealed that the humic-like fluorescent component C4 showed the highest removal (by 44%) during the coagulation stage. After coagulation-UV/H2O2 treatment, the humic-like fluorescent component C3 had the highest removal (by 72%), whereas xenobiotic organic fluorescent components C1 and C4 remained recalcitrant to decomposition. Significant correlations (R2 > 0.8) between C1 and the hydrophobic acids and non- acid hydrophobics suggested the possibility of using fluorescence spectroscopy as an effective tool to assess variations in DOM fraction treatment efficacy in coagulation-UV/H2O2 systems. After the combined treatment, toxic inhibition of cellular activity by post PhWW decreased from 88% to 47% and biodegradability increased from 0.1 to 0.52.
|
Authors | Feng Qian, Mengchang He, Jieyun Wu, Huibing Yu, Liang Duan |
Journal | Journal of environmental sciences (China)
(J Environ Sci (China))
Vol. 76
Pg. 329-338
(Feb 2019)
ISSN: 1001-0742 [Print] Netherlands |
PMID | 30528024
(Publication Type: Journal Article)
|
Copyright | Copyright © 2018. Published by Elsevier B.V. |
Chemical References |
- Organic Chemicals
- Waste Water
- Water Pollutants, Chemical
- Hydrogen Peroxide
|
Topics |
- Drug Industry
- Ecotoxicology
- Hydrogen Peroxide
(chemistry)
- Organic Chemicals
(chemistry, isolation & purification, metabolism, toxicity)
- Oxidation-Reduction
- Ultraviolet Rays
- Wastewater
(chemistry)
- Water Pollutants, Chemical
(chemistry, isolation & purification, metabolism, toxicity)
|