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Sludge thickening performance of mesh filtration process
1Ecological Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi 441-8580, Japan. park@zero.eco.tut.ac.jp
Summary
A simple mesh filtration system effectively thickens wastewater sludge for small facilities. This process achieves high sludge reduction rates and produces effluent suitable for direct environmental discharge.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Solid Waste Management
Background:
- Small-scale wastewater treatment facilities require efficient sludge management solutions.
- Conventional mechanical thickening equipment is often unsuitable for small facilities.
- Developing a convenient pre-treatment sludge thickening process is crucial.
Purpose of the Study:
- To evaluate the sludge thickening performance of a mesh filtration system.
- To assess the feasibility of using mesh filtration for small-scale wastewater sludge.
- To determine the effectiveness of hydraulic pressure-driven filtration.
Main Methods:
- Utilized a mesh filtration system with opening sizes from 100-500 micrometers.
- Tested sludge with initial concentrations of 3,000-9,000 mg-SS/L from a domestic wastewater treatment plant.
- Employed filtration driven solely by hydraulic pressure.
Main Results:
- Achieved sludge reduction rates between 85-95% over 6-7 hours.
- Observed high initial filtration rates that decreased with declining hydraulic pressure.
- Produced effluent with very low suspended solids (SS), suitable for direct discharge.
Conclusions:
- Mesh filtration is a viable and convenient method for thickening sludge in small wastewater treatment facilities.
- The system demonstrates significant sludge volume reduction and produces high-quality effluent.
- This approach offers a practical solution for improving aquatic environments served by small-scale treatment plants.