PMID- 18469395
OWN - NLM
STAT- MEDLINE
DCOM- 20080930
LR  - 20080512
IS  - 0273-1223 (Print)
IS  - 0273-1223 (Linking)
VI  - 57
IP  - 8
DP  - 2008
TI  - Sixty-five-year old final clarifier performance rivals that of modern designs.
PG  - 1235-40
LID - 10.2166/wst.2008.224 [doi]
AB  - The Stickney plant of the Metropolitan Wastewater Reclamation District of Greater 
      Chicago (MWRDGC), one of the largest wastewater treatment plants in the world, 
      treats an average dry weather flow of 22 m3/s and a sustained wet weather flow of 
      52 m3/s that can peak to 63 m3/s. Most of the inner city of Chicago has combined 
      sewers, and in order to reduce pollution through combined sewer overflows (CSO), 
      the 175 km Tunnel and Reservoir Plan (TARP) tunnels, up to 9.1 m in diameter, 
      were constructed to receive and convey CSO to a reservoir from where it will be 
      pumped to the Stickney treatment plant. Pumping back storm flows will result in 
      sustained wet weather flows over periods of weeks. Much of the success of the 
      plant will depend on the ability of 96 circular final clarifiers to produce an 
      effluent of acceptable quality. The nitrifying activated sludge plant is arranged 
      in a plug-flow configuration, and some denitrification takes place as a result of 
      the high oxygen demand in the first pass of the four-pass aeration basins that 
      have a length to width ratio of 18:1. The SVI of the mixed liquor varies between 
      60 and 80 ml/g. The final clarifiers, which were designed by the District's 
      design office in 1938, have functioned for more than 65 years without major 
      changes and are still producing very high-quality effluent. This paper will 
      discuss the design and operation of these final clarifiers and compare the design 
      with more modern design practices.
CI  - (c) IWA Publishing 2008.
FAU - Barnard, James L
AU  - Barnard JL
AD  - Black & Veatch, 8400 Ward Parkway, Kansas City, MO 64114, USA. barnardjl@bv.com
FAU - Kunetz, Thomas E
AU  - Kunetz TE
FAU - Sobanski, Joseph P
AU  - Sobanski JP
LA  - eng
PT  - Journal Article
PL  - England
TA  - Water Sci Technol
JT  - Water science and technology : a journal of the International Association on 
      Water Pollution Research
JID - 9879497
SB  - IM
MH  - Chicago
MH  - *Facility Design and Construction
MH  - Flocculation
MH  - Waste Disposal, Fluid/*methods
MH  - Water Movements
MH  - Water Pollution/*prevention & control
MH  - Weather
EDAT- 2008/05/13 09:00
MHDA- 2008/10/01 09:00
CRDT- 2008/05/13 09:00
PHST- 2008/05/13 09:00 [pubmed]
PHST- 2008/10/01 09:00 [medline]
PHST- 2008/05/13 09:00 [entrez]
AID - 10.2166/wst.2008.224 [doi]
PST - ppublish
SO  - Water Sci Technol. 2008;57(8):1235-40. doi: 10.2166/wst.2008.224.