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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.)

Pretreatment usingOpuntia cochenilliferafollowed by household slow sand filters: technological alternatives for supplying isolated communities

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Author(s):
Souza Freitas, Barbara Luiza [1] ; Sabogal-Paz, Lyda Patricia [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Dept Hydraul & Sanitat, Sao Carlos Sch Engn, 400 Trabalhador Sao Carlense Ave, BR-13566590 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: ENVIRONMENTAL TECHNOLOGY; v. 41, n. 21, p. 2783-2794, SEP 18 2020.
Web of Science Citations: 9
Abstract

Household slow sand filter (HSSF) performance in continuous and intermittent flows was evaluated when influent water was treated with a natural coagulant extracted fromOpuntia cochenillifera. The water under study, used as influent, had a turbidity of 111 +/- 17.3 NTU. When clarifying the water withO. cochenillifera, the best condition obtained was 30 mg L(-1)in natural pH (without correction), generating clarified water with turbidity satisfactory to filters operation (7.83 +/- 2.32 NTU). The results indicated a better performance of continuous flow HSSF in turbidity removal (79.2% +/- 8.39%) and higher efficiency of intermittent flow HSSF in the removal ofE. coli(2.86 log +/- 0.79 log for 12 h pause period and 2.41 log +/- 0.42 log for 4 h pause period). For the sake of comparison, the evaluated HSSFs had the same production (60 L day(-1)). The impact on the interruption of the 96-h feed into the HSSFs was analysed and the results indicated a significant change in the quality of the filtered water after resuming the operation. This fragility of technology must be considered when it is implemented as lack of water can be a reality in the target communities. Acute toxicological assays withC. xanthuslarvae showed no toxicity for pretreated and filtered water; however, more testing should be performed. (AU)

FAPESP's process: 14/12712-8 - BioSand filters operated in continuous and intermittent flows: challenges in the construction, operation and maintenance
Grantee:Lyda Patricia Sabogal Paz
Support Opportunities: Regular Research Grants