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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Implications of COD analysis use in the peracetic acid-based wastewater treatment

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Author(s):
Leite, Luan de Souza [1] ; Tango, Mariana Daniel [1] ; Filho, Jose Antonio Zanetoni [1] ; Hoffmann, Maria Teresa [1] ; Daniel, Luiz Antonio [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Hydraul & Sanitat, Av Trabalhador Sao Carlense 400, BR-1356659 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: WATER SCIENCE AND TECHNOLOGY; v. 84, n. 5 JUL 2021.
Web of Science Citations: 0
Abstract

Peracetic acid (PAA) stands out as a safe and environmental-friendly oxidant and disinfectant which has been effectively used in wastewater treatment. Chemical oxygen demand (COD) is a very popular analysis in wastewater treatment, however the interference of residual PAA on the COD measurement is still unknown. In this context, this study investigated the implications of applying the COD analysis in PAA-based treatment. Each 1 mg<bold>L</bold>(-1) of PAA increased the COD concentration around 13.5 mg O-2<bold>L</bold>(-1). Residual PAA and hydrogen peroxide (H2O2) were efficiently neutralized by sodium metabisulfite (SMBS) at the optimal SMBS/PAA ratio of 10.2:1 in a wide pH range (5 to 9). The effect of PAA addition in the COD concentration was evaluated in different water matrices (potassium hydrogen phthalate and wastewater solutions). The COD results with the SMBS addition at optimal SMBS/PAA ratio were lower than the ones without it. It may happen due to the neutralization of residual H2O2/PAA and the complexity of the water matrices which can interfere in the COD results. This study discussed the impact of the residual H2O2/PAA neutralization before the COD analysis and this investigation can be used as a practical guideline for the correct COD measurement in PAA-based treatment. (AU)

FAPESP's process: 17/00088-6 - Wastewater treatment: organic matter and nitrogen removal, deodorization of liquid and gaseous effluent, followed by peracetic acid disinfection/oxidation
Grantee:Luiz Antonio Daniel
Support Opportunities: Regular Research Grants
FAPESP's process: 19/05759-1 - Study of Algal Organic Matter (AOM) removal by coagulation-flocculation and use of pre-treatments
Grantee:Luan de Souza Leite
Support Opportunities: Scholarships in Brazil - Doctorate