Kiron Lemna Covered Aerated Lagoon

Kiron, IA | Water

Overview

ISG worked with the City of Kiron to design a covered aerated lagoon with a LEMNA reactor and an ultraviolet light disinfection system.


Opportunity

The City of Kiron needed to replace their outdated activated sludge treatment system with a new system to achieve year-round ammonia nitrogen removal and seasonal E.coli compliance.

Solution

ISG designed a new treatment system consisting of a covered two-cell aerated lagoon with a LEMNA polishing reactor and UV disinfection. A new lift station along with a sewage grinder was included in the inlet structure to the lagoon. Finally, a UV disinfection system was designed and constructed to comply with E. coli bacteriological compliance requirements. The covered aerated lagoon was designed to handle increased loading from the Infiltration and Inflow (I/I), retain heat during winter months (which decreases the footprint needed for the nitrification process in the polishing reactor), and attain the level of treatment required by the IDNR stream standards. The operation requirements are very comparable with the City’s previous mechanical plant, and the City is now able to consistently meet effluent ammonia nitrogen limits during both warm weather, and cold weather months.


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