Wastewater treatment plant one step closer to expansion


By Kelli Ameling • Last Updated 10:01 am on Thursday, October 13, 2011

GREENVILLE — Lansing’s Granger Construction Co. was awarded the bid for the expansion of Greenville’s wastewater treatment plant.
Granger’s was the lowest bidder at $2.31 million. Erhardt Construction was second lowest at $2.33 million, a 1.43 percent difference. Granger’s bid is about $100,000 more than the engineer’s estimate, which Bosanic attributed to the solar panel system.
The expansion will allow the wastewater plant to expand from processing 1.6 million gallons to 1.75 millions gallons per day and will add a bio oxidation tower to break down waste.
The treatment process will include microorganisms, referred to as bugs, which will eat the bacteria and unwanted parts of the waste to help clean the waste and filter the water through to the next step through a trickle system.
Eventually, the water will go back into the Flat River nearly as clean as the river itself, while the unwanted waste will be used in agricultural fields as soil amendments, said Project Manager Steven Williams of Williams and Works Inc.
Along with the expansion, the project will include a 75-kilowatt ground-mounted solar system to offset the electrical load of the plant, said City Manager George Bosanic. The system is part of the GreenERville project to install solar panels on all publicly owned buildings in the city.
Bosanic said the solar system will be built in the river floodplain, but will be built in a way to not impact the panels or the flow of water.
The bid specifications allowed contractors to consider using United Solar products or a system of an equal value and quality. Granger proposed to use solar panels made by a German company.
Bosanic said will discuss using United Solar products and finding some ways to cut the project’s cost with Granger. Those discussions can only be explored after the contractor is awarded the bid.
Erhardt did propose using United Solar products in their bid, but due to the specifications of the $1.9 million grant the city will receive from USEDA for the project, the city has to go with the lowest bidder unless there is strong evidence otherwise.
The rest of the project will be paid for through a United States Department of Agriculture low-interest loan in the amount of about $924,000.

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