In May 2002, ARRO began operating and maintaining the 0.5 million gallons per day wastewater treatment plant and collection system that serves Conewago Township.  The Aqua-Aerobic Systems sequencing batch reactor plant consists of two 0.25 MGD units followed by chlorine contact tanks and a cascading outfall, and two aerobic sludge digesters.

At the treatment plant, ARRO is responsible for the normal operation and maintenance of the facility, including staffing, operator licensing, sampling, analyses, discharge monitoring report preparation, routine equipment maintenance, general housekeeping, and other miscellaneous tasks.

ARRO’s efforts have included additional influent and industrial testing, mechanical changes to pumps and piping, repair and rewiring of floating mixers, and process control modifications for more cost-effective treatment and biological nutrient removal.

The collection system includes over 100 individual residential grinder pump stations and eight major submersible pump stations, all operated and maintained by ARRO.