EDITOR’S PICKS
Lakeside’s E.A. Aerotor Plant has been installed at Haring Township.
He added: “Atmost of themunicipal treatment plants that we manage, BOD levels are around a standard 150-200mg/L, so the average here at Haring of 700mg/L ismore concentrated due to the small number of homes. And with such a large amount of retail (includingWalmart, Home Depot) andmultiple fast-food outlets, our wastewater intake is pretty unique”.
Haring Township is busy winning the battle against very high BOD and Phosphorus.
“Following the decision that Cadillac would no longer take in Haring’s wastewater, we had to get this thing built.We carried out a full study, asking bidders to hold their price for a year. Finally, when we had the finances in place, we went with Lakeside Equipment Corporation. Their ditches are tried and true; very dependable, and at a competitive price.”
There at the plant in the very early stages, working closely with the original construction crews, has been Infrastructure Alternatives Inc, (IAI), who provide contract operations,maintenance and management services for numerous treatment facilities across the State ofMichigan.
“We always knew that we’d be battling against very high BOD and Phosphorus,” said Nathan Filley, IAI’s Lead Operator at the Haring WWTP.
“So, the choice of Lakeside’s E.A. Aerotor Plant, which is particularly suitable for small communities, has proved a wise one. It has all the components of a systemof amuch larger scale, with extended aeration andmixing, combined with final clarification. Despite the ongoing challenges we face, it works very well for the flow and organic loading”.
38 | June 2023 |
www.draintraderltd.com
The Covid lockdown created new problems for all of us, with the vastmajority of wastewater treatment plants seeing an increase in flow due to somany people having to stay at home. But at Haring Township, flows weremore than cut in half. Even when the local fast-food outlets were allowed to reopen, restrictionsmeant take- away only, so with such little flow coming through the plant, nowhere near enoughmixed liquor was going into the clarifier, meaning no blanket at the bottom, upsetting the balance.
Furthermore, the very low flow alsomeant that even when the plant’s rotors ramped down to theirminimumspeed, the Dissolved Oxygen (DO) was well above its normal level of around 2.0mg/L.
‘PROTECTINGTHE LOCAL ENVIRONMENT’
“Cloudy discharge water was something I definitely did not want to see,”added Nathan Filley, for whomtypical of IAI’s philosophy, being the last line of defense in protecting the local environment was a primary driving factor in himwanting to work in the industry. Michigan is no stranger of course to great lakes, and Haring’s treated wastewater is discharged into the popular, trout-rich Clam River.
He continued: “The small populationmeans we don’t receivemuch wastewater fromthe use of showers or washingmachines, so to help with the high strength intake at the plant, Lakeside designed rotors with the capability of providing high oxygen transfer. And with the help of Gosling Czubak, we’ve also learned tomanage the seasonal differences in levels that are brought on by the big changes in temperature during the year.”
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