ฉันรักแปลis rising and clumping in the secondary clarifier, increase return sludge rates and or lower aeration rates a little.Lowering sludge age can also help if it is a little too high.
4) Don't forget that slow-settling sludge can be caused by both old and young sludge. Perform a diluted settle-ability test of 50% Mixed Liquor Suspended Solids and 50% clarifier supernatant to determine whether more or less wasting is appropriate when sludge settles slowly?
5) A small amount of pin floc on the surface of the final clarifier often accompanies the old sludge age that is normal for the extended aeration process. If amounts become excessive and cover more than 25% of the clarifier surface, increased wasting a small percentage may be helpful.