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Operators report strong treatment performance, list pump-station repairs and investigations
Summary
Authority staff reported February plant performance (avg. 2.6 million gallons; BOD 96%, TSS 98.5%, total nitrogen removal 86% and 33 lb under the permit) and detailed pump-station and equipment work, a high-influent pH investigation, and planned equipment swaps for VFDs and a new blower installation.
During the March 11 meeting the plant operator delivered the February operating report and maintenance updates. "We average 2.6 million gallons," the operator said, adding treatment performance figures: biochemical oxygen demand removal at 96%, total suspended solids removal at 98.5%, and total nitrogen removal at 86%, with the plant 33 pounds under the nitrogen permit for the reporting period.
The operator said UV maintenance will be completed and UV seasonal disinfection will resume April 1. Staff reported replacing floats at Snowberry Pump Station after a failed low float caused pumps to go airbound, and replacing a high float at West Farms. Generator services were completed at Patrick and Harland pump stations.
Crews traced several recent sewer backups to private laterals, including an incident at Midas and repeated clogs at Summit Birch Apartments; staff assisted but determined those were private-line issues. The operator described a bar screen fault caused by a large manhole pan entering the system and noted plans to replace a corroded pump flange in spring to prevent further pump faults.
Staff are investigating a period of high influent pH (reading up to around 9). Samplers were placed near the DOT garage and other sites to identify a source, but sampling was hindered by a blizzard that interfered with collection on the first deployment.
On construction and equipment: the authority reported transformer, breaker panels, VFDs and the PLC panel have arrived for the Yukon project; staff plan a phased VFD swap to keep two pumps running while units are exchanged to minimize bypassing. A replacement blower (borger) and a larger VFD are on order, and staff replaced worn plastic UV gate parts with stainless 316 components.
