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Nolan wastewater staff report improved treatment but warn of wipes, ozone and storm impacts
Summary
City wastewater staff reported plants met permit limits in March, described removal of 22,500 pounds of rags from a basin, outlined polymer trials that improved sludge solids, and detailed continuing ozone-system problems that contributed to a coliform exceedance during a weekend of heavy rain.
Scott Murphy, project manager for wastewater at the City of Fayetteville, told the Water & Sewer Committee on April 8 that both treatment plants were in compliance for March but that heavy rain in April strained systems and produced operational challenges.
Murphy said crews found and removed 22,500 pounds of rags and debris from one basin during cleaning of a 3.7-million-gallon basin. “This is the dreaded flushable wipe that we all hate in the utility business,” Murphy said, adding that rags damage pumps and aerators and are costly to remove.
The committee heard that a new jet-aeration unit has been installed to reduce mechanical problems tied to rag buildup. Murphy said the jet aerator uses pumped water to induce air through a venturi, providing mixing…
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