Toxicity and genotoxicity of hospital laundry wastewaters treated with photocatalytic ozonation

Kern, Deivid Ismael; Schwaickhardt, Rômulo de Oliveira; Mohr, Geane; Lobo, Eduardo A.; Kist, Lourdes Teresinha; Machado, Ênio Leandro

doi:10.1016/j.scitotenv.2012.11.023

Cited by 56 publications

(19 citation statements)

References 34 publications

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“…However, Mahmoud and Freire (2007) studied the kinetic behavior of ozonation for the degradation of the azodye Remazol Black B, and found that the kinetic constant in basic medium was higher (k = 0.035 min -1 ) when compared with the kinetic constant obtained in acid medium (0.0067 min -1 ). Kern et al (2012) studied conventional ozonation of wastewater from a hospital laundry. The authors found that in acid medium (pH 3 to 3.5) the kinetic constant of COD degradation was 0.0036 min -1 , with a coefficient of determination equal to 97%.…”

Section: Resultsmentioning

confidence: 99%

Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Carvalho¹,

Borges²,

Pereira³

et al. 2018

Biosci. J.

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This study evaluated the adjustment of four kinetic models and their respective parameters on data of dairy wastewater treatment by the physico-chemical process of flotation and ozonation. The experiment was implemented during the year 2014, with all the tests in triplicate. The treatments were carried out at different pH levels (3.6, 7.0 and 10.4), and flotation/ozonation was catalyzed by manganese (Mn 2+) in neutral level (pH 7.0). Best removal efficiencies for chemical oxygen demand (COD) were obtained in acidic medium, with removals greater than 75% after 20 min of treatment. There was no significant difference with regards to addition of Mn 2+ on COD removal by the physicochemical process. The kinetic models that best fit to the experimental data, for all treatments, were the asymptotic (residual) model and that of Chan and Chu. Treatment in acidic medium showed the highest values of the kinetic parameters for the adjusted model, obtaining a k coefficient equal to 0.2394 min-1 for the asymptotic model and kinetic coefficient 1/ρ of 0.4816 min-1 for the Chan and Chu model, both presenting a determination coefficient greater than 99%.

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Section: Resultsmentioning

confidence: 99%

Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Carvalho¹,

Borges²,

Pereira³

et al. 2018

Biosci. J.

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“…Although the process UV/O 3 /TiO 2 eliminated 100 % of thermotolerant coliforms, only 30 % of chemical oxygen demand (COD) removal was obtained for the same condition. Better efficiencies were reported in a related study by the application of photocatalytic ozonation (UV/O 3 /Fe 2+ ), which resulted in a COD removal of 59 % (Kern et al 2013).…”

Section: Introductionmentioning

confidence: 83%

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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“…The treatment of ammonia in hospital wastewater has been done using an integrated anaerobic-aerobic fixed film bioreactor (Rezaee et al 2005) [4], biologically active zeolite ion exchange columns [5], electrocoagulation [6], ozone [7], photocatalytic ozonation [8], fungal [9,10], and Fenton oxidation [11]. The weaknesses of some researchers' methods for treatment of hospital waste are costly, difficult to process and generate new waste.…”

Section: Introductionmentioning

confidence: 99%

Treatment of ammonia in liquid hospital waste using activated carbon

Riyanto¹,

Hayati²

2017

AIP Conference Proceedings

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Abstract. In this research study of the treatment of ammonia in liquid hospitals waste using activated carbon. This study aims to the effect of activated carbon weight and precipitation time to the treatment of ammonia in liquid hospitals waste. Hospital liquid waste has been taken from Jogja International Hospital (JIH) Yogyakarta, Indonesia. Hospital liquid waste 100 mL is mixed with activated carbon with the varied weight that is 15, 30 and 60 g. After added with activated carbon then stirred with a magnetic stirrer for 15 minutes and a precipitation time of 0.5, 1.0 and 2.0 hours. The next step is the filtrate analyzed ammonia concentrations before and after treatment using UV-Vis Spectrophotometer. The results showed that activated carbon can reduce ammonia concentration in hospital liquid waste. The amount of the active carbon and the time of stirring, the greater the ammonia concentration decreases in hospital liquid waste. The best condition for the decrease of the ammonia concentration was obtained with active carbon and precipitation time is 60 g and 1.0 hours, respectively with ammonia decrease of 95.93%. The conclusion is that activated carbon can reduce ammonia concentration in hospital liquid waste.

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Toxicity and genotoxicity of hospital laundry wastewaters treated with photocatalytic ozonation

Cited by 56 publications

References 34 publications

Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Treatment of hospital laundry wastewater by UV/H2O2 process

Treatment of ammonia in liquid hospital waste using activated carbon

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