Factors affecting ultraviolet irradiation/hydrogen peroxide (UV/H2O2) degradation of mixed N-nitrosamines in water

Zhou, Chao; Gao, Naiyun; Deng, Yang; Chu, Wenhai; Rong, Wenlei; Zhou, Shengdong

doi:10.1016/j.jhazmat.2012.06.032

Cited by 98 publications

(57 citation statements)

References 28 publications

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“…The pH decreased over the treatment period and the final values ranged from 4.7 to 6.5 (no data shown). This behavior was also reported by other authors (Braun and Oliveros 2002;Daneshvar et al 2008;Georgiou et al 2002;Zhou et al 2012), and it is probably related to the formation of acid species during oxidation process. Figure 7 clearly shows the reduction of residual COD as the [H 2 O 2 ]/COD ratio increases.…”

Section: Evaluation Of Uv-h 2 O 2 Processsupporting

confidence: 88%

“…While some authors reported better oxidation efficiencies at acidic pH (Alaton et al 2002;Galindo et al 2001;Zhou et al 2012), others reported better results at basic pH (Raj and Quen 2005) or even under neutral conditions (Zuorro et al 2013). These different behaviors evidence the particularity of each system and effluent and reinforce the importance of the application of tractability studies to real wastewaters.…”

Section: Evaluation Of Uv-h 2 O 2 Processmentioning

confidence: 96%

“…Among the various AOPs, several advantages can be pointed out for the UV/H 2 O 2 process: (1) UV irradiation from 200 to 300 nm is a very effective way to inactivate microorganisms (Zhou and Smith 2002); (2) H 2 O 2 is the only chemical required, which has an infinite solubility in water and can be stored for use according to process demand (Legrini et al 1993;Sundstrom et al 1992); (3) the UV/H 2 O 2 process is a very cost-effective source of hydroxyl radicals, it is simple to operate, and it is readily accomplished in the existing infrastructures (Legrini et al 1993;Stefan et al 1996;Zhou et al 2012); and (4) there is no sludge production during UV/H 2 O 2 treatment, thus eliminating the need of further disposal (Smith and Frailey 1990).…”

Section: Introductionmentioning

confidence: 99%

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Treatment of hospital laundry wastewater by UV/H2O2 process

Zotesso

Cossich

Janeiro

et al. 2016

Environ Sci Pollut Res

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Hospitals consume a large volume of water to carry out their activities and, hence, generate a large volume of effluent that is commonly discharged into the local sewage system without any treatment. Among the various sectors of healthcare facilities, the laundry is responsible for the majority of water consumption and generates a highly complex effluent. Although several advanced oxidation processes (AOPs) are currently under investigation on the degradation of a variety of contaminants, few of them are based on real wastewater samples. In this paper, the UV/HO AOP was evaluated on the treatment of a hospital laundry wastewater, after the application of a physicochemical pretreatment composed of coagulation-flocculation and anthracite filtration. For the UV/HO process, a photoreactor equipped with a low-pressure UV-C lamp was used and the effects of initial pH and [HO]/chemical oxygen demand (COD) ratio on COD removal were investigated through a randomized factorial block design that considered the batches of effluent as blocks. The results indicated that the initial pH had no significant effect on the COD removal, and the process was favored by the increase in [HO]/COD ratio. Color and turbidity were satisfactorily reduced after the application of the physicochemical pretreatment, and COD was completely removed by the UV/HO process under suitable conditions. The results of this study show that the UV/HO AOP is a promising candidate for hospital laundry wastewater treatment and should be explored to enable wastewater reuse in the washing process.

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Section: Evaluation Of Uv-h 2 O 2 Processsupporting

confidence: 88%

Section: Evaluation Of Uv-h 2 O 2 Processmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Treatment of hospital laundry wastewater by UV/H2O2 process

Zotesso

Cossich

Janeiro

et al. 2016

Environ Sci Pollut Res

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“…These results could be attributed to the selfdecomposition of H 2 O 2 at high pH or to the hydroxyl radical scavenger property of the OH − ions which are highly concentrated at basic pH (Zhou et al 2012) and compete with the pesticides for the produced hydroxyl radicals. However, both effects are less notable for a relative high concentration of H 2 O 2 (200 mg L −1 ) where the production of HO• radicals is higher and the scavenger effect or the self H 2 O 2 decomposition can be offset.…”

Section: Effect Of H 2 O 2 Concentration and Initial Ph During The Dementioning

confidence: 99%

“…Particularly, the combination of ultraviolet (UV) light and hydrogen peroxide (H 2 O 2 ), so-called UV/H 2 O 2 process, has shown high efficiency for the treatment of natural waters and wastewaters contaminated with non-biodegradable and/or toxic organic compounds. The UV/H 2 O 2 process is based in the photolysis of H 2 O 2 to produce hydroxyl radicals (HO•) (Chiron et al 2000;Zhou et al 2012), which promotes organic pollutants degradation according to the following reactions:…”

mentioning

confidence: 99%

Degradation of a Toxic Mixture of the Pesticides Carbofuran and Iprodione by UV/H2O2: Evaluation of Parameters and Implications of the Degradation Pathways on the Synergistic Effects

Lopez-Alvarez

Villegas-Guzmán

Peñuela

et al. 2016

Water Air Soil Pollut

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The degradation of two pesticides, carbofuran (CBF) and ioprodine (IPR), was studied by the photolytic decomposition of hydrogen peroxide (UV/H 2 O 2 ). The influence of two experimental parameters, H 2 O 2 concentration and initial pH, as well as their interactions, was investigated. Optimization was carried out where experimental parameters were determined for the treatment of each pesticide. Both pesticides were totally eliminated by UV/H 2 O 2 system under optimal conditions. However, significant differences were found: CBF degradation was influenced by both parameters and their interactions, while IPR degradation was not statistically affected by initial pH. Interestingly, analysis of degradation pathways showed a major influence of photolysis process and oxidation due to hydrogen peroxide for the CBF degradation, while the synergistic combination between both of them played the most relevant role during IPR degradation. A mixture of both pesticides was also submitted to UV/H 2 O 2 action in which a lower rate was observed for IPR elimination while CBF was not affected. A 90 % of chemical oxygen demand (COD) was removed and 75 % of mineralization was achieved after the treatment of the mixture. Almost 92 % of the toxicity was eliminated making this technique a promising process to treat toxic mixtures of these pesticides.

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Dyes and Biological Stains

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Destruction of Hazardous Chemicals in the Laboratory

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Factors affecting ultraviolet irradiation/hydrogen peroxide (UV/H2O2) degradation of mixed N-nitrosamines in water

Cited by 98 publications

References 28 publications

Treatment of hospital laundry wastewater by UV/H2O2 process

Treatment of hospital laundry wastewater by UV/H2O2 process

Degradation of a Toxic Mixture of the Pesticides Carbofuran and Iprodione by UV/H2O2: Evaluation of Parameters and Implications of the Degradation Pathways on the Synergistic Effects

Dyes and Biological Stains

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