True Grit

An innovative technology helps an Iowa treatment plant correct a problem with abrasive particles causing excess centrifuge wear

Grit in biosolids was destroying the dewatering centrifuge at the Council Bluffs (Iowa) Water Pollution Control Plant. Damage to the scroll bowl and other wear cost $30,000 to $40,000 per rebuild, sometimes done twice a year. Grit also accu-mulated in the anaerobic digesters,...

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