Use Of Ozone For The Treatment Of A Combined Urban And Industrial Effluent: A Case History

Tofani, Gabriel; Richard, Yves

doi:10.1080/01919519508547540

Cited by 6 publications

(3 citation statements)

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“…Their presence in sewage works is variable depending on their use in industrial processing in addition to domestic activities. A LAS average concentration of 1−10 mg·L -1 can be found in plants treating only domestic wastewater. , This range is markedly increased when municipal sewers are also receiving industrial wastes from washing processes. , Much work has been reported to assess the aerobic biodegradability and environmental safety of LASs and their degradation products. − As aerobic biodegradability has been proven, LAS removal from wastewater has generally been restricted to conventional biological treatments. Although the percent of LAS removed in biological systems is usually over 95% by activated sludge and 70% by biological filter sewage treatment systems, − however, some difficulties have been found in the treatment of wastewater with high LAS concentrations: (i) Foaming occurs and negatively affects the oxygen mass transfer in the aeration basin and the sludge settling characteristics.…”

Section: Introductionmentioning

confidence: 99%

Sodium Dodecylbenzenesulfonate Removal from Water and Wastewater. 1. Kinetics of Decomposition by Ozonation

Beltrán

García‐Araya

Álvarez

2000

Ind. Eng. Chem. Res.

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Ozonation experiments were conducted to investigate the sodium dodecylbenzenesulfonate (NaDBS) removal from aqueous solution and domestic wastewater. The influence of pH and tert-butyl alcohol concentration, a known scavenger of hydroxyl radicals, on the ozonation rate was observed. The degradation rate was especially fast at pH 10 in the absence of hydroxyl radical scavengers. The rate constants of the reactions NaDBS-ozone and NaDBS-hydroxyl radical were found to be 3.68 and 1.16 × 10 10 M -1 ‚s -1 , respectively. Organic matter in wastewater competes with NaDBS for both dissolved ozone and hydroxyl radical, resulting in a decrease in the overall removal rate of the surfactant. COD and TOC were not completely removed from the wastewater due to an ozone-resistant fraction which remained after the treatment. Nevertheless, the ability of ozone to cause alteration in the molecular structures of dissolved compounds resulted in an increase of the wastewater biodegradability, demonstrated by the increase of the BOD 5 /COD ratio. The contributions of the direct and free radical reactions to the oxidation of NaDBS were evaluated in percentages of pollutant removal.

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Section: Introductionmentioning

confidence: 99%

Sodium Dodecylbenzenesulfonate Removal from Water and Wastewater. 1. Kinetics of Decomposition by Ozonation

Beltrán

García‐Araya

Álvarez

2000

Ind. Eng. Chem. Res.

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“…The literature (17)(18)(19)(20)(21)(22)(23) and the authors' own studies (1,12) show that ozone is one of the most effective oxidizing agents, which can be used in the first phase. The so-called preozonation of wastewaters enables their further effective biodegradation.…”

Section: Introductionmentioning

confidence: 99%

Advanced Oxidation of Textile Wastewaters

Perkowski

Kos

Ledakowicz

2000

Ozone: Science & Engineering

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Model dyeing and laundering wastewaters produced during two basic technological operations of the textile industry were subjected to treatment by advanced oxidation processes (AOPs). The following agents were used: ozone (031, hydrogen peroxide (H202) and UV radiation. They were applied separately and in all possible combinations: 0 3 + W, 0 3 + H 2 0 2 , UV + HzOz, as well as all three at the same time: 0 3 + UV + H202.Effluents before and after the treatment were analyzed according to requirements of the Polish Standards that included pH, color threshold, COD and concentration of anionic and non-ionic surfactants. Ozonation was carried out in a lab-scale bubble column reactor with a centrally located UV burner. The most effective version of AOPs proved to be the simultaneous use of all three agents. In the case of such treatment of dyeing wastewaters nearly complete discoloration and full decomposition of surface-active substances were obtained at 80% reduction of COD. A similar tendency was observed in the case of laundering wastewater, though in that case the results were slightly worse, which may be explained by much higher initial concentrations of the pollutants. Good treatment effects have also been obtained in combined treatment by simultaneous use of hydrogen peroxide and ozone. 535 Downloaded by [Selcuk Universitesi] at 21:21 03 January 2015 536 J. Perkowski et sl.

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“…Several researchers studied the use of ozone in industrial and municipal wastewaters. Toffani and Richard (1995) discussed the ozonation of a highly colored municipal wastewater containing significant concentrations of detergents. Pilot data was used to design an industrial ozonation facility.…”

Section: Sorption Of Organicsmentioning

confidence: 99%