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Reduction of sludge by a biodrying process: Parameter optimization and mechanism
Bo Bian1, Yue Shen1, Xiuren Hu1
1School of Environment, Nanjing Normal University, Nanjing, 210046, PR China.
Chemosphere
|February 7, 2020
Summary
Biodrying technology effectively reduces and detoxifies hazardous waste sludge from chemical fiber plants. This process significantly decreases dry matter and toxic substances while increasing the sludge
Area of Science:
- Environmental Science
- Microbiology
- Waste Management
Background:
- Chemical fiber plant sewage sludge poses environmental risks and incurs high disposal costs.
- Effective reduction and detoxification methods for hazardous waste sludge are crucial.
Purpose of the Study:
- To evaluate the performance of a biodrying system using thermophilic microorganisms for sludge reduction and detoxification.
- To optimize parameters for continuous biodrying of hazardous waste sludge.
Main Methods:
- Controlled biodrying experiments with thermophilic microorganisms at 60°C.
- Optimized microbial agent dosage at 4% of dry sludge weight.
- Continuous reaction monitoring and analysis of sludge properties.
Main Results:
- Achieved 65.97% dehydration with a 2.51% dehydration rate.
- Reduced dry matter by 22% and toxic substances by 9%.
- Increased calorific value from 1678.53 J to 12256.17 J, with a 65% reduction effect in pilot-scale tests.
Conclusions:
- Biodrying is a viable technology for hazardous waste sludge reduction and detoxification.
- Optimized biodrying enhances sludge properties, increasing its calorific value.
- Further research into spectral analysis and microbial sequencing can elucidate biodrying mechanisms for industrial application.
