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Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source
Published on: August 17, 2018
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Sewage sludge drying method combining pressurized electro-osmotic dewatering with subsequent bio-drying.
Qian Li1, Xuebin Lu1, Haigang Guo2
1School of Environmental Science and Engineering, Tianjin University, Tianjin 300354, China.
Bioresource Technology
|May 7, 2018
Summary
Pressurized electro-osmotic dewatering (PEOD) efficiently dewaters sewage sludge before bio-drying. Inoculation slightly enhances bio-drying performance, leading to improved moisture removal and temperature increase.
Area of Science:
- Environmental Engineering
- Waste Management
- Biotechnology
Background:
- Conventional sewage sludge treatment often involves bulking agents.
- Sludge dewatering and bio-drying are critical for waste reduction and resource recovery.
- Optimizing pretreatment processes is essential for efficient sludge management.
Purpose of the Study:
- To propose and optimize pressurized electro-osmotic dewatering (PEOD) as a pretreatment for sewage sludge bio-drying.
- To evaluate the effect of inoculation on the bio-drying process of dewatered sludge.
- To analyze the volatile solid degradation dynamics during bio-drying.
Main Methods:
- Optimized parameters for pressurized electro-osmotic dewatering (PEOD) to achieve dewatered sewage sludge (DSS).
- Conducted two bio-drying tests on DSS: one with inoculation (T2) and one without (T1).
- Measured temperature, moisture content (MC) removal, and volatile solid degradation rate constants (k).
Main Results:
- PEOD reduced sludge moisture content from 83.41% to 60.0% within 7.5 minutes under optimal conditions.
- Inoculated bio-drying (T2) reached a higher maximum temperature (68.1°C) compared to non-inoculated (T1).
- MC accumulative removal rates were 41.49% for T1 and 44.60% for T2; degradation rate constants were similar (0.00501 for T1, 0.00498 for T2).
Conclusions:
- PEOD is an efficient, quick, and energy-saving pretreatment for sewage sludge.
- Inoculation offers a slight benefit to sewage sludge bio-drying, enhancing temperature and moisture removal.
- The study provides insights into optimizing sludge bio-drying through effective dewatering and inoculation strategies.
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