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Stabilization of primary sewage sludge during vermicomposting
1Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, India.
Journal of Hazardous Materials
|October 24, 2007
Summary
Sewage sludge can be transformed into valuable vermicompost using Eisenia foetida earthworms. Mixing 30-40% primary sewage sludge with cow dung yields high-quality fertilizer without harming the earthworms.
Area of Science:
- Environmental Science
- Waste Management
- Soil Science
Background:
- Rapid urbanization and population growth in India have led to a significant increase in sewage sludge production.
- Primary sewage sludge (PSS) poses disposal challenges and environmental concerns.
Purpose of the Study:
- To evaluate the vermicomposting potential of primary sewage sludge (PSS) amended with cow dung (CD) using the epigeic earthworm Eisenia foetida.
- To assess the fertilizer quality of the resulting vermicompost and the impact on earthworm growth and reproduction.
Main Methods:
- Laboratory-scale vermireactors were used to process mixtures of PSS and CD in varying proportions.
- Earthworm growth, reproduction, and key physicochemical parameters of the vermicompost were monitored over 11-15 weeks.
Main Results:
- Vermicomposting of PSS and CD mixtures resulted in decreased pH, TOC, and C:N ratio, with increased EC, TKN, TK, and TP.
- While heavy metal content increased, Eisenia foetida exhibited optimal biomass in 10% PSS + 90% CD and highest growth rate in 30% PSS + 70% CD.
- No adverse effects on fertilizer quality or earthworm health were observed with 30-40% PSS inclusion.
Conclusions:
- Eisenia foetida can effectively transform primary sewage sludge into nutrient-rich vermicompost.
- Optimal PSS to CD ratios (30-40%) are crucial for producing high-quality fertilizer and supporting earthworm populations.
- Vermicomposting offers a sustainable solution for managing sewage sludge and producing valuable soil amendments.
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