Efficiency of a low-cost pyramid-shaped solar still for pesticide removal from highly contaminated water.
Chemosphere
; 234: 427-437, 2019 Nov.
Article
em En
| MEDLINE
| ID: mdl-31228845
Water pollution by pesticides and other chemical contaminants is a subject of major importance due to the risk for human health and the environment. The search for remediation processes able to withdraw chemical contaminants from water and to allows water reuse is an urgent need. Herein, a simple and cheap system for pesticides removal was constructed and evaluated using water samples contaminated with two widely used herbicides (imazapic and imazethapyr, at g L-1 level). Operation parameters and process efficiency, in terms of removal rate in the reclaimed water and degradation rate of pesticides in the dry residue, were quantitatively determined. The model was tested in real-world field experiments and was able to remove more than 99.95% of both contaminants from a 10â¯L solution containing 4.16⯱â¯0.94â¯g of imazethapyr and 1.31⯱â¯0.17â¯g of imazapic, generating reusable water with minimum volume loss (<2.5%). Liquid chromatography coupled to mass spectrometry was used to determine the herbicides content in all samples and to estimate the degree of degradation of the substances as well as the occurrence of transformation products of imazapic and imazethapyr. The system efficiency in removing contaminants of emerging concern from surface water was also evaluated. The process have generated output water with undetected levels for two fungicides present in a local river in Southern Brazil.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Praguicidas
/
Poluentes Químicos da Água
/
Purificação da Água
Tipo de estudo:
Health_economic_evaluation
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2019
Tipo de documento:
Article
País de publicação:
Reino Unido