Stabilization Of Thickened-Activated Sludge Through The Anoxic-Aerobic Digestion Process
Aerobic digestion is widely used to treat waste-activated sludge and thickened sludge from wastewater treatment plant due to its shorter retention time and achieving the same efficiency in solids volume reduction compared to anaerobic digestion. However, the supernatant and filtrate from the aero...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
2002
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/12139/1/FK_2002_92.pdf |
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| Summary: | Aerobic digestion is widely used to treat waste-activated sludge and thickened
sludge from wastewater treatment plant due to its shorter retention time and achieving
the same efficiency in solids volume reduction compared to anaerobic digestion.
However, the supernatant and filtrate from the aerobic digestion system contain high
concentration of suspended solids. The nitrogen which had been embedded in sludge
is solubilized to form ammonical and nitric nitrogen which in tum transferred to the
liquor and cause the increase of nitrogen loading in sewage treatment plant. In this
study, anoxic-aerobic digestion is applied to remove both the mixed-liquor volatile
suspended solids (ML VSS) and soluble nitrogen simultaneously. The objectives of
the study are to investigate and evaluate the removal efficiency of both ML VSS and
soluble nitrogen by anoxic-aerobic digestion and compared to the aerobic control
digesters, with and without lime control.
By applying anoxic-aerobic digestion, a comparable of ML VSS reduction was
gained to aerobic digestion. 66.12% and 63.00% of MLVSS destruction was found in
both anoxic-aerobic digesters, with and without methanol addition respectively. |
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