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Comparative study of UV/H 2 O 2 and UV/PMS processes for treating pulp and paper wastewater.
- Source :
-
Water science and technology : a journal of the International Association on Water Pollution Research [Water Sci Technol] 2022 Oct; Vol. 86 (8), pp. 2032-2044. - Publication Year :
- 2022
-
Abstract
- Pulp and paper wastewater (PPWW) contains numerous refractory and harmful contaminants that require advanced treatment to meet the discharge criteria. This study compared the efficacy of two PPWW treatments: ultraviolet/peroxymonosulfate (UV/PMS) and ultraviolet/H <subscript>2</subscript> O <subscript>2</subscript> (UV/H <subscript>2</subscript> O <subscript>2</subscript> ) working under similar circumstances. The initial pH value, oxidant dosage, UV radiation intensity, and pseudo-first-order constant k <subscript>obs</subscript> were systematically studied in both systems. Optimally, the UV/PMS process produced an effluent of higher quality than the UV/H <subscript>2</subscript> O <subscript>2</subscript> , as measured by the removal efficiencies of chemical oxygen demand (COD) in 60 min, which were 48.2 and 64.3% for the respective UV/H <subscript>2</subscript> O <subscript>2</subscript> and UV/PMS processes and corresponding k <subscript>obs</subscript> values of 0.0102 and 0.0159 min <superscript>-1</superscript> , respectively. Radical scavenging experiments demonstrated that •OH was the primary reactive oxygen species in UV/H <subscript>2</subscript> O <subscript>2</subscript> process, and •OH and SO <subscript>4</subscript> <superscript>-</superscript> • in the UV/PMS process. Moreover, ultraviolet-visible spectroscopy and gas chromatography coupled mass spectroscopy analyses showed that deep treatment of petroleum hydrocarbons with carbon chain lengths greater than 18 and macromolecular semi-volatile organic compounds in paper wastewater is difficult, whereas the UV/PMS process can significantly improve the removal of amides, esters, phenols, and other aromatic compounds.
Details
- Language :
- English
- ISSN :
- 0273-1223
- Volume :
- 86
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Water science and technology : a journal of the International Association on Water Pollution Research
- Publication Type :
- Academic Journal
- Accession number :
- 36315094
- Full Text :
- https://doi.org/10.2166/wst.2022.326