Household slow sand filters in intermittent and continuous flows to treat water containing low mineral ion concentrations and Bisphenol A

Autor(es)

Sabogal-Paz, Lyda Patricia ^[1] ; Campos, Luiza Cintra ^[2] ; Bogush, Anna ^[3] ; Canales, Melisa ^[2]

Afiliação do(s) autor(es)

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

^[2] UCL, Dept Civil Environm & Geomat Engn, Gower St, London WC1E 6BT - England

^[3] UCL, Dept Earth Sci, Gower St, London WC1E 6BT - England

• Tipo de documento: Artigo Científico
• Fonte: Science of The Total Environment; v. 702, FEB 1 2020.
• Citações Web of Science: 0

Resumo

Household slow sand filter (HSSF) has been used as an alternative to drinking water treatment in rural communities worldwide; however, its performance to treat influent water with quality similar to rainwater still needs further studies. Rainwater presents low pH and slight mineral ion concentrations, an aspect that can modify the filter media and consequently the HSSF efficiency. Furthermore, house roofs used in rainwater harvesting can be made of plastic. Therefore, it can introduce chemicals such as Bisphenol A (BPA) in the water. In this context, two pilot-scale HSSFs operated in continuous and intermittent flows were evaluated to treat water containing BPA and low mineral ion concentrations in order to assess the filter performance. Filter media leaching was noticed in the trials; thus, filter media and construction material selection must be carefully evaluated to eliminate risks of pollutant occurrence in drinking water. Operational differences between continuous and intermittent flows influenced the HSSF efficiency for BPA and DOC removals; even so, the filters' performance was low probably due to the slow schmutzdecke development. According to tracer test results, HSSF can be classified as a plug flow reactor and strategies to improve its hydraulic performance are not required. (C) 2019 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 17/02512-0 - Avaliação do desempenho de biofiltros em areia conforme o método de operação incluindo sua relação na formação do Schmutzdecke e na remoção de bisfenol A
• Beneficiário: Lyda Patricia Sabogal Paz
• Modalidade de apoio: Bolsas no Exterior - Pesquisa