Significance of water quality and radiation wavelength for UV photolysis of PhCs in simulated mixed solutions

• Authors: Rabindra Giri , Hiroaki Ozaki , Xia Guo , Ryohei Takanami , Shogo Taniguchi
• Languages of publication: EN

Abstracts

EN

Ultraviolet (UV) photolysis of sixteen pharmaceutical compounds (PhCs) in mixed solutions with four types of water and two sets of UV radiation was investigated. UVC (254 nm) photolysis was ineffective at eliminating a large number of PhCs while a big number of them were refractory. However, vacuum UV (VUV: 185 nm + 254 nm) photolysis in the same experimental conditions eliminated the PhCs almost completely. The eliminations in ultrapure water (UPW), tap water (TW) and Neya River water (NRW) and their organic/inorganic contents were inversely correlated, which was more evident in VUV photolysis. Natural organic matter (NOM) in NRW did not have an impact in indirect photolysis, but effluent organic matter (EfOM) in secondary-treated effluent (NWTPE) enhanced indirect photolysis, which was more evident in VUV photolysis underlining the point that radiation wavelength/intensity can be a limiting factor in organic-rich waters. Moreover, VUV photolysis was far superior (90% mineralization) to UVC photolysis (10% mineralization) for PhCs mineralization. The greatly enhanced elimination and mineralization efficiencies observed for VUV photolysis were attributed to accelerated direct photolysis with 185 nm wavelength and indirect photolysis involving ·OH. The results demonstrated efficacy of VUV photolysis in wastewater treatment and its potential use as a tertiary treatment.

Keywords

EN

Elimination; Hydroxyl radical; Mineralization; Organic/inorganic constituents; Effluent organic matter

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2014
• Volume: 12
• Issue: 6
• Pages: 659-671

Dates

published

1 - 6 - 2014

online

13 - 3 - 2014

Contributors

author

Rabindra Giri

• Osaka Sangyo University

author

Hiroaki Ozaki

• Osaka Sangyo University

author

Xia Guo

• Osaka Sangyo University

author

Ryohei Takanami

• Osaka Sangyo University

author

Shogo Taniguchi

• Osaka Sangyo University

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Identifiers

DOI

10.2478/s11532-014-0526-2