Occurrence and leaching of silver in municipal sewage sludge in China.
Ecotoxicol Environ Saf
; 189: 109929, 2020 Feb.
Article
em En
| MEDLINE
| ID: mdl-31718800
ABSTRACT
Sewage treatment plants effectively remove silver (Ag) from sewage. Sewage sludge can therefore be important Ag sinks, polluting the environment with this element. In this work, we report a nation-wide survey on the Ag content of sewage sludge in China (0.23-19.02â¯mgâ¯kg-1, average 2.72â¯mgâ¯kg-1). Furthermore, we identify that sludge disposal represents an important Ag pollution source (84.48 tons in 2016) for the environment by estimating the national and provincial inventories of sludge-borne Ag in China. Also the positive correlations between the per capita gross domestic product (GDP)/provincial GDP and the content/mass loadings of Ag highlighted the impact of human activities on Ag pollution. In different samples, strong complexation of thiosulfate contributed to the highest leaching concentration (95.00-438.15⯵gâ¯kg-1) and ratio (1.9-8.8%) of Ag, emphasizing the necessity of a long-term risk assessment for landfill and land application of sludge.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Prata
/
Poluentes Químicos da Água
/
Eliminação de Resíduos Líquidos
Tipo de estudo:
Risk_factors_studies
Limite:
Humans
País como assunto:
Asia
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article