Desinfecção de efluente anaeróbio com o uso de ozônio/cloro

Silva, Gustavo Henrique Ribeiro da; Daniel, Luiz Antônio

doi:10.1590/s1413-41522015020000083662

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…The increased contact time may have interfered with the reaction time and increased the formation of by-products. El-Rehaili (1995) and Silva and Daniel (2015) also observed this behavior of COD increase when they applied chlorine and ozone/chlorine in sanitary effluents. The authors explain that this behavior is a possible change in the organic matrix by action of the chlorine, making it more accessible to oxidation in tests of COD.…”

Section: Resultsmentioning

confidence: 64%

Wastewater Chlorination for Reuse, an Alternative for Small Communities

Quartaroli

Cardoso

Ribeiro³

et al. 2018

Water Environment Research

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Reuse of wastewater is a practice that has been employed all over the world, mainly in agriculture, where the main aim is to reduce the demand for water and provide nutrients. However, these waters for reuse often have excessive amounts of pathogenic microorganisms, requiring a specific disinfection step even after being subjected to a purification process. Thus, this research aimed to evaluate the potential use of calcium hypochlorite and sodium hypochlorite as disinfectant agents for the sanitary effluent of the treatment system based on constructed wetlands for later reuse. Disinfection tests were carried out in batch, using three dosages of hypochlorite (5, 10 and 15 mg.L À1 ) and different contact. In all disinfection tests, inactivation of indicator microorganisms (total coliforms and E. coli) was considered effective for the two disinfectant agents adopted, satisfying the criteria for reuse according to the World Health Organization (WHO). There was no formation of trihalomethanes after disinfection tests. Water Environ. Res., 90, 2100Res., 90, (2018.

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Section: Resultsmentioning

confidence: 64%

Wastewater Chlorination for Reuse, an Alternative for Small Communities

Quartaroli

Cardoso

Ribeiro³

et al. 2018

Water Environment Research

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“…Bhatta et al (2015) observed a slight increase in pH values in their study on the treatment of wastewater by ozone produced in dielectric barrier discharge, in agreement with the results found here. Likewise, Silva and Daniel (2015) observed an increase in pH values (p = 0.05) for the ozonized effluents compared to the UASB reactor effluent.…”

Section: Potential Hydrogen (Ph)mentioning

confidence: 75%

Ozonation improves physical attributes in domestic sewage effluent

Júnior¹,

Sandri²,

Alencar³

et al. 2019

Rev. ambiente água

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Root Zone Wastewater Treatment (RZWT) is an option of natural wastewater treatment widely studied throughout the world, being a technology based on physical, chemical and biological processes. However, there are some attributes in effluent that occasionally are not eliminated by RZWT. In this context, the use of ozone may contribute to mineralization, disinfection, detoxification, and, especially, color and turbidity removal. Ozone is an excellent oxidant, with great potential to reduce color, turbidity and other attributes in liquids, such as in wastewater treatment. This paper evaluated the effect of different ozone exposure times (0, 30, 60, 90, 120 and 150 minutes) and the application of different dosages of ozone (0, 4, 10, 17, 25 and 35 mg L-1 of O3) on Hydrogeonic Potential (pH), Electrical Conductivity (EC), Dissolved Oxygen (OD), Total Alkalinity (Alk.), Sodium (Na) and Potassium (K) in domestic sewage effluent treated by the RZWT. Different exposure times and ozone dosages did not influence the attributes Potassium, Sodium, Ammonia and Total Solids. Color and turbidity decreased, while pH, Alkalinity and Dissolved Oxygen increased at all exposure times and O3 dosages in relation to the non-ozonized effluent.

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“…Bila et al (2004) have shown that the sequence of coagulation-flocculation treatments + ozonation + biological treatment increases the efficiency of the biological treatment stage. Silva and Daniel (2015), by using ozone followed by chlorine disinfection, obtained good removals of biochemical oxygen demand.…”

Section: Ozone Consumptionmentioning

confidence: 99%

Ozonation as a pre-treatment of landfill leachate

et al. 2020

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Ozone is an oxidizing agent with a potential for removing complex molecules, including those of difficult microbiological decomposition, such as the molecules found in landfill leachates. This effluent presents high organic content, including recalcitrant molecules. Therefore, this study evaluated the efficiency of ozonation in the treatment of raw leachate at the Primavera landfill, located in Mato Grosso, Brazil. The experiments were carried out using the batch system. The leachate pH value was set at 7 and 10, and the contact times between the gas and the leachate were 20, 40, 60, 80, and 100 minutes. Throughout the study, we analyzed color, turbidity, pH value, chemical oxygen demand (COD), and ultraviolet absorbance at 254 nm (UV abs) of the leachate, both before and after ozonation. Results show that ozonation presented high removal of color, COD and UV abs when pH was 7. In contrast, turbidity removal was higher when the pH value was 10. Regarding contact time, we observed a high removal of color (between 80% and 90%) and UV abs (between 60% and 70%) at 40 minutes, depending on the pH value. Removal was also high for turbidity (approximately 75%) starting at 20 minutes with the pH value at 10, and at 70 minutes with pH at 7. The removal relation within all analyzed parameters (due to ozone consumption) decreased throughout the reaction time. Thus, we concluded that ozonation as a pre-treatment of leachate is indeed satisfactory because of its great capacity for organic material removal.

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Desinfecção de efluente anaeróbio com o uso de ozônio/cloro

Cited by 6 publications

References 23 publications

Wastewater Chlorination for Reuse, an Alternative for Small Communities

Wastewater Chlorination for Reuse, an Alternative for Small Communities

Ozonation improves physical attributes in domestic sewage effluent

Ozonation as a pre-treatment of landfill leachate

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