Solutions to Mitigate Effects of Microthrix parvicella at the ... - pncwa

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Meridian Classifying selectors • Baffles at AB exit • ML Pump stations • 3,000 gal wet well • 6 in dia suction pipe-short length • 400-500 gpm pumps Pump Stations Pipeline to DAFT Baffles
Classifying selectors have downsides • Continuous surface wasting = thin WAS • Thickening prior to digestion is very important • Meridian has DAFTs for WAS thickening – ideal for thin WAS because not hydraulically limited • Results of non-continuous wasting • Remove foam when it becomes a problem • Can still lead to bulking and may require secondary bulking control method like PAX addition • Could lead to Digester foaming Brown and Caldwell 33
Page 1 and 2: PNCWA 2012 Annual Conference Daniel
Page 3 and 4: Background
Page 5 and 6: What is Microthrix Parvicella (MP)?
Page 7 and 8: Meridian Microthrix Issues Seasonal
Page 9 and 10: City Needed Help Controlling MP •
Page 11 and 12: Control of Microthrix Various contr
Page 13 and 14: Investigating Solutions Can we elim
Page 15 and 16: Investigating Solutions Can we chan
Page 17 and 18: Investigating Solutions Chemical ad
Page 19 and 20: BC led investigations - effects of
Page 21 and 22: Investigating Solutions Can we elim
Page 23 and 24: BC led investigations - eliminate f
Page 25 and 26: BC led investigations - Foam Wastin
Page 27 and 28: Eliminating MP in Meridian • Inst
Page 29 and 30: Eliminate foam trapping - Repipe RA
Page 31: Eliminate Foam Trapping - New RAS P
Page 35 and 36: PAX vs. Classifying Selector - Whic
Page 37 and 38: Concluding Remarks
Page 39 and 40: Questions Brown and Caldwell 39

Solutions to Mitigate Effects of Microthrix parvicella at the ... - pncwa

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