Disinfection of anaerobic/aerobic sanitary effluent using ozone: Formaldehyde formation

Author(s)

Miranda Slompo, Nathalie Dyane ^[1] ; Ribeiro da Silva, Gustavo Henrique ^[2]

Affiliation

^[1] Univ Sao Paulo, Dept Hydraul & Sanitat, EESC USP, Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo State FEB UNESP, Dept Environm & Civil Engn, Bauru, SP - Brazil

• Document type: Journal article
• Source: WATER ENVIRONMENT RESEARCH; v. 91, n. 9, p. 898-905, SEP 2019.
• Web of Science Citations: 0

Abstract

The scarcity of natural resources supports the perspective of reusing treated effluents, mainly in agriculture, where the reduction in the demand of drinking water and the provision of alternative sources for nutrients arc important. However, the process of disinfection, essential to the protection of human health, generates deleterious by-products to both humans and the environment. This research aimed to evaluate the use of ozone as a disinfectant for wastewater treated by anaerobic/aerobic baffled reactor for later agricultural reuse. Disinfection tests were conducted by applying ozone, in batch, with applied dosages of 5, 8, and 10 mg O-3/L and contact time of 7 min. All the tests led to formaldehyde formation, therefore within the standard suggested by the World Health Organization. For the indicators total coliforms and Escherichia coli, the ozone was considered effective, satisfying the criteria for agricultural reuse according to the World Health Organization of a dosage of 8 mg O-3/L. (C) 2019 Water Environment Federation (AU)

• FAPESP's process: 12/05297-9 - Disinfection of sanitary effluent from a new anaerobic/aerobic baffled reactor configuration using ozone and ozone/hydrogen peroxide
• Grantee: Nathalie Dyane Miranda Slompo
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 11/10816-2 - Wastewater disinfection using chlorine, ozone, ozone/chlorine and ozone/hydrogen peroxide
• Grantee: Gustavo Henrique Ribeiro da Silva
• Support Opportunities: Regular Research Grants