Pretreatment using Opuntia cochenillifera followed by household slow sand filters: technological alternatives for supplying isolated communities.
Environ Technol
; 41(21): 2783-2794, 2020 Sep.
Article
en En
| MEDLINE
| ID: mdl-30747041
Household slow sand filter (HSSF) performance in continuous and intermittent flows was evaluated when influent water was treated with a natural coagulant extracted from Opuntia cochenillifera. The water under study, used as influent, had a turbidity of 111 ± 17.3â
NTU. When clarifying the water with O. cochenillifera, the best condition obtained was 30â
â
mgâ
L-1 in natural pH (without correction), generating clarified water with turbidity satisfactory to filters operation (7.83 ± 2.32â
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 of E. coli (2.86 log ± 0.79 log for 12â
â
h pause period and 2.41 log ± 0.42 log for 4â
â
h pause period). For the sake of comparison, the evaluated HSSFs had the same production (60â
Lâ
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 with C. xanthus larvae showed no toxicity for pretreated and filtered water; however, more testing should be performed.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Purificación del Agua
/
Opuntia
Idioma:
En
Revista:
Environ Technol
Asunto de la revista:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Año:
2020
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Reino Unido