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Beneficial use of lime mud from kraft pulp industry for drying and microbiological decontamination of sewage sludge
- Source :
- Journal of environmental management. 296
- Publication Year :
- 2021
-
Abstract
- Sewage sludge (SS) is a global environmental, social, and economic problem that requires a sustainable management approach. Still, the production of other industrial wastes, such as lime mud (LM), has recently gained considerable attention to avoid landfilling. This work aims to present a new approach for converting SS and LM into value-added products within the circular economy perspective. In particular, the effect of LM and calcined lime mud (CLM) as drying adjuvants and SS sanitation agents are investigated. Two out of three SS samples show Escherichia coli contamination above the Portuguese limit established for soil application, while no Salmonella spp. was detected in the searched samples. The addition of CLM to SS in a ratio between 0.05 and 0.15 g CLM/gwb, lead to complete elimination of the microbiological contamination in almost all cases. Contrarily, the use of LM does not seem efficient to act as a sanitation agent. Both LM and CLM show a positive impact on the drying process when compared to the raw SS, increasing the drying rate, and reducing the drying time. The most favourable drying conditions to maximize the drying rate and minimize the drying time (until 30% of moisture) are 130 °C, 0.15 g adj/gwb, and 2.5 mm of plate thickness. The thermal treatment (100 and 130 °C) without adjuvants reduces the microbiological contamination below the legal limit. Overall, a beneficial effect is observed by adding CLM to SS, open the possibility of producing a safer organic soil improver.
- Subjects :
- Pulp mill
Environmental Engineering
Moisture
Sewage
Oxides
General Medicine
Human decontamination
Management, Monitoring, Policy and Law
engineering.material
Contamination
Calcium Compounds
Pulp and paper industry
Kraft process
engineering
Environmental science
Sewage treatment
Waste Management and Disposal
Sludge
Decontamination
Lime
Subjects
Details
- ISSN :
- 10958630
- Volume :
- 296
- Database :
- OpenAIRE
- Journal :
- Journal of environmental management
- Accession number :
- edsair.doi.dedup.....f8f2b87b74e15a778d02526b73c99a91