The Angola Wastewater Treatment Plant, located in Angola, IN, is a Class III facility designed for an average daily flow of 1.7 MGD. With a conventional activated sludge process, their plant consistently removes more than 95% of the biochemical oxygen demand, total suspended solids, and ammonia.  This process includes both physical and biological treatment including such equipment as screening, grit removal, primary clarification, secondary aeration, and UV disinfection before discharging effluent to the H. D. Wood Ditch. This ditch eventually flows into the Pigeon Creek, which in turn flows into Long Lake and eventually into the St. Joseph River. Since the St. Joseph River flows into Lake Michigan, the City of Angola is under the jurisdiction of the Great Lakes Initiative and must therefore maintain effluent limits of Total Phosphorus below 1.0 mg/L.

The treatment plant’s main challenge was that they had old brick structures that were starting to break apart. Bricks were falling out and some were just breaking apart, which was causing infiltration and blocking sewer flow lines.  When the final clarifier was initially built, they did not coat the trough in it, so it would use twice the brushes in a year compared to the other troughs with a coating on them.

Jeffrey Gaff, Wastewater Superintendent of the Angola Wastewater Treatment Plant, selected ART, an OBIC-certified installer, for this project due to the projected cost-savings for the city by using a spray-lining system over an alternative replacement or rehab option.

Bypass pumping is costly in any lift station or pump station repair project. The longer the wet-well is out of commission, the more expensive the overall project. With OBIC’s spray applied polyurea lining system, those concerns are mitigated. Not only is installation more efficient than other wet-well repair options, but OBIC products are also quick to cure, meaning systems will be back up and running with minimal downtime.

To begin this project, the ART installation team cleaned and patched the manhole structures where bricks had broken or fallen out completely. They also patched around the influent and the outfall lines as well.  The lift station wet well required a lot of prep work to get all the grease off the walls.  ART then went to work lining the treatment plant’s manholes and wet wells with the OBIC Armor system.  The final clarifier trough was lined with a single layer of OBIC 1000, but in a gray color.  

Gaff said of his experience with ART, “They took the time to answer any questions we had, they were on time and finished in a timely manner. They called or stopped by to make sure we were happy with the job, when they left the job site it was cleaned, and you could not tell they were there. Very pleased with the service we received from ART.”

Ensuring a fast return to service does not mean sacrificing quality. As a matter of fact, OBIC products are proven to stop corrosion from microbial induced corrosion (MIC) of concrete structures, have excellent impact and abrasion resistance in harsh environments, and can extend the life of a wet-well for 50 years or more.

This project is a great example of diversification in our services and the OBIC product line as it shows how effective it is for more than rehabilitating manholes.   Find out how ART can help rehabilitate your wastewater treatment plant by contacting us at or 419-636-2684.