Effects of hydrogen peroxide preoxidation on clarification and reduction of the microbial load of groundwater and surface water sources for household treatment

Autor(es)

Silva, Kamila Jessie Sammarro ^[1] ; Leite, Luan de Souza ^[1] ; Fava, Natalia de Melo Nasser ^[1] ; Daniel, Luiz Antonio ^[1] ; Sabogal-Paz, Lyda Patricia ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Hydraul & Sanitat, 400 Trabalhador Sao Carlense Ave, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: WATER SCIENCE AND TECHNOLOGY-WATER SUPPLY; DEC 2021.
• Citações Web of Science: 0

Resumo

Household water treatment (HWT) technologies are a promising strategy for addressing the waterborne diseases burden. However, in order to be efficient, these are often limited to water quality and require it to not exceed a certain threshold of physicochemical and microbiological contamination. Additionally, some popular HWTs, as chlorination, are related to by-product formation. Preoxidation may improve source water quality, and hydrogen peroxide (H2O2) is an oxidant that has not been deeply explored in this specific application, so it could be an innovative approach to HWTs. We investigated effects of H2O2 preoxidation in two natural source waters (surface and groundwater), spiked with a high level of microorganisms. Clarification results suggested this pretreatment may improve life of HWTs. Reduction in microbial load of groundwater was considered ineffective, but 5-min H2O2 preoxidation at 15 mg L-1 led to >4.0 log(10) inactivation of Phi X174 coliphage and >3.0 of Escherichia coli in surface water. We believe this performance was increased due to the presence of catalysts in the river water. This raised the point that water quality may be not only impairing, but potentially beneficial to the main HWT and characterization is crucial prior to the implementation of any technologies. (AU)

• Processo FAPESP: 19/05759-1 - Estudo da remoção da Matéria Orgânica Algal (MOA) por coagulação-floculação e emprego de pré-tratamentos
• Beneficiário: Luan de Souza Leite
• Modalidade de apoio: Bolsas no Brasil - Doutorado