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Published on: December 25, 2015
Sludge drying reed beds: full- and pilot-scale study for activated sludge treatment.
Summary
Sludge drying reed beds improve sludge dewatering and mineralization. Optimized loading rates and management enhance dry matter content and sludge quality for easier spreading and regulatory compliance.
Area of Science:
- Environmental Engineering
- Wastewater Treatment Technologies
- Solid Waste Management
Background:
- Sludge drying reed beds (SDRB) have been utilized for sludge dewatering and mineralization since the early 1990s.
- However, suboptimal performance regarding Dry Matter (DM) content and mineralization necessitates further investigation.
Purpose of the Study:
- To evaluate the impact of sludge loading rate, sludge quality, and loading frequency on SDRB dewatering and mineralization efficiencies.
- To assess hydraulic behavior, oxygen dynamics, redox potential, pollutant removal, and dry matter content.
- To analyze the rheological properties of dewatered sludge for ease of handling and regulatory compliance.
Main Methods:
- Monitoring of 8 pilot-scale (2 m2 each) and 1 full-scale (13,000 p.e., 8 beds of 470 m2) sludge drying reed bed systems.
- Testing of two filtration layers and two loading rhythms on pilot systems.
- Assessment of hydraulic behavior, gas concentrations (O2, CO2), redox potential, pollutant removal, and dry matter content.
- Evaluation of sludge rheological quality from full-scale beds.
Main Results:
- Optimized loading rates and management strategies were investigated for improved dewatering and mineralization.
- Hydraulic behavior, O2/CO2 concentrations, redox potential, and pollutant removal were systematically assessed.
- Extracted sludge exhibited superior rheological properties compared to sludge of similar dry matter content, facilitating easier spreading.
- The dewatered sludge met criteria for solid and stabilized sludge under French regulations.
Conclusions:
- The study provides valuable design and management recommendations for optimizing sludge drying reed bed performance.
- Enhanced dewatering and mineralization lead to sludge with improved handling characteristics and regulatory acceptance.
- SDRBs can be effectively managed to produce stabilized sludge suitable for land application or disposal.
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