Poor settling and compacting sludge results in high SV30 and SVI. When sluddge does not settle or compact, the secondary clarifier bed depth increases. This results in less solids conentration in the RAS & WAS lines. What does this mean?
- Return line has less MLSS than is desirable. To maintain F/M ratio, you would have to return more flow via the RAS line.
- Hydraulics can become a problem if you increase return flows to maintain the F/M ratio.
- Waste sudge going for disposal has more water. Making dewatering more difficult or creating digester capacity issues.