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AN INNOVATIVE GRIT REMOVAL PROCESS FOR THE CITY OF COUNCIL BLUFFS WWTP PROVIDES FINER GRIT REMOVAL AT LOW HEAD LOSSES

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The Council Bluffs Water Pollution Control Plant (WPCP) has been operating at its existing location since the mid 1970's to treat the City of Council Bluff's sanitary wastewater. This project included the evaluation, replacement, and upgrade of preliminary treatment facilities that were in need of extensive improvements due to significant structural and equipment deterioration from age and corrosion. The primary goal of this project was to replace the existing aerated grit removal equipment and system with a more efficient system. The grit particles in the area around Council Bluffs include a very fine silt particle contributory from the loess hills development near the Missouri River. The existing aerated grit removal system could remove particles down to a size of 300 micron. However, these finer silt particles would pass through the existing grit removal process and settle in downstream tanks, reducing their effective capacity. The goal of this project was to remove particles smaller than 100 micron.

Several grit removal alternatives were considered and the Headcell technology was chosen and implemented. This is an innovative process that has lower head losses and finer grit removal capability that could be installed within the existing plant structure and hydraulics. This is the largest Headcell installation in the world treating a peak flow capacity of over 30 million gallons per day (mgd).

This paper will present the findings of the study leading to the implementation of the Headcell technology and a description of how the Headcell technology is effective in removing and capturing the grit particles. The successful installation and operation of the equipment will also be presented
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Document Type: Research Article

Publication date: 01 January 2005

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