Fall Sewer Lagoon Turnover

During spring and fall the air temperature warms or cools the top layer of water in the sewer lagoons, creating “thermal instability”.  In the fall, the cooler surface water sinks down, displacing the warmer water at the bottom of the lagoon, it dislodges the solids at the bottom, which have been quietly anaerobically digesting.  The anaerobic digestion process releases gas as a byproduct, which becomes entrained in the sludge.  Once dislodged, the gas trapped in the sludge causes it to rise from the bottom of the lagoon and float.  This process is called ‘turn over’. With the rising gas byproduct of anaerobic digestion, unpleasant lagoon odors are released in the atmosphere all at once.    These odors, coupled with the floating sludge mat, are strong during lagoon turnover, which typically lasts a couple of weeks depending on the loading of the lagoons.  Every city and town with lagoons go through the same process and smell. 

Pumping to Sioux Falls - 01/01/7 - 10/31/17 = 82,402,784 gallons ($678,041.72)

 

PUBLIC HEARING NOTICE - FRIDAY, DECEMBER 29, 2017 8:05 am at Harrisburg City Hall Conference Room, 301 E Willow Street, Harrisburg SD 
The purpose of the public hearing is to discuss the proposed Wastewater Treatment Facility Construction Project, the proposed financing, and the source of repayment for any loans.  The public is invited to attend and comment on the project. 

Harrisburg Wastewater Facility Plan 

Banner Engineering - Wastewater Value Engineering Study 11-21-17

12-18-17 Stockwell Engineers - Updated Wastewater Treatment Cost Estimates and Rate Model

Wastewater Alternatives

Banner Regionalization Council Presentation Mon 4-4-16

4-17-17 Wastewater Public Comments

5-01-17 Minutes Addendum regarding Wastewater 

DENR 2015 Surface Water Discharge Compliance Inspection