Chemical conditioning of sewage sludge in the environmental and sanitary aspect
Sewage sludge conditioning can be performed using various methods: chemical, mechanical, thermal and other (ultrasounds, electromagnetic field, washing). The most popular is chemical conditioning consisting of the addition of inorganic coagulants (conventional coagulation) and organic polymers (poly...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | Desalination and Water Treatment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398625001353 |
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| Summary: | Sewage sludge conditioning can be performed using various methods: chemical, mechanical, thermal and other (ultrasounds, electromagnetic field, washing). The most popular is chemical conditioning consisting of the addition of inorganic coagulants (conventional coagulation) and organic polymers (polymeric coagulation). As a result of environmental conditions and physico-chemical changes, polyelectrolytes used in the coagulation process may undergo depolymerization, which results in the formation of monomers containing acrylamide. The aim of research was to determine the possibility of acrylamide formation as a by-product of wastewater and sewage sludge treatment and the associated risks to human health. Recently, the attention of the scientific community has attracted the presence of acrylamide in wastewater, processed food and in the natural environment. The possibility of penetration of these substances into sewage sludge as a result of conditioning can potentially be dangerous. Considering the use of polyelectrolytes in the sludge conditioning process, some examinations were performed using gas chromatography electron–capture detector to determine the acrylamide content. Thus the concentration of this compound in the water extract from sludge was 3,2µgL−1. The possibility of acrylamide release from polyelectrolytes is a problem that should be reviewed and further possibilities of its occurrence, reduction or complete elimination should be investigated. |
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| ISSN: | 1944-3986 |