Question
Download Solution PDFThe maximum efficiency of BOD removal is achieved in
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
BOD removal efficiency of various Biological Units
| Biological Unit | BOD Removal (%) |
| Oxidation Pond | 90% |
| Oxidation Ditch | 97% |
| Aerated Lagoons | 80% - 90% |
| Trickling Filters | 75% |
Additional Information
Oxidation ditch
- An oxidation ditch is a modified activated
sludge biological treatment process that utilizes long solids retention times (SRTs) to remove biodegradable organics. - Oxidation ditches are typically complete mix systems, but they can be modified to approach plug flow conditions.
- Retention time is much longer in an oxidation ditch usually two days.
- BOD removal Efficiency is 97% and and bacteria removal efficiency is 98%.
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