Sludge thickening performance of mesh filtration process

Small-scale wastewater treatment facilities play an important role in improving the aquatic environment in many countries. Although sludge treatment is essential for overall wastewater treatment, it is difficult for small-scale facilities to use mechanical equipment or other facilities. As the first...

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Bibliographic Details
Published in:Water science and technology 2004-01, Vol.50 (8), p.125-133
Main Authors: Park, M S, Kiso, Y, Jung, Y J, Simase, M, Wang, W H, Kitao, T, Min, K S
Format: Article
Language:English
Subjects:
Aquatic environment
Domestic wastewater
Facility Design and Construction
Filtration
Filtration - methods
Hydraulic pressure
Mechanical equipment
Particle Size
Pressure
Reduction
Sewage - chemistry
Sludge
Sludge thickening
Sludge treatment
Thickening
Waste Disposal, Fluid - methods
Wastewater treatment
Water levels
Water purification
Water Purification - methods
Water treatment plants
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Summary:Small-scale wastewater treatment facilities play an important role in improving the aquatic environment in many countries. Although sludge treatment is essential for overall wastewater treatment, it is difficult for small-scale facilities to use mechanical equipment or other facilities. As the first step of the sludge treatment, it is important to develop a convenient sludge thickening process for small-scale facilities. In this work, we examined the sludge thickening performance of a mesh filtration system: the mesh opening sizes of 100-500 microm, and the sludge (3,000-9,000 mg-SS/L) was obtained from a domestic wastewater treatment facility. The filtration was carried out only under the hydraulic pressure between the water level and the effluent port connected to the mesh filter module. The sludge reduction rates were in the range of 85-95% for 6-7 h; the initial filtration rate was very high, but the rate decreased with a decrease in hydraulic pressure due to the reduction of the water level in the vessel. In addition, the effluents (passed through the mesh) contained very low SS and could be directly discharged into the environment.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2004.0505