Controlling Wastewater Plant Odor

Controlling Wastewater Plant Odor


A wastewater plant constructed in 2007 processes 600,000-800,000 gallons of water per day from three different food processing facilities. The plant is located near a business and residential area, and when it announced a plan to expand, the odors emanating from the facility presented a public relations issue. 


ChemTreat identified two areas of the plant that contributed to the odor issue: 

1. A circular, 450,000-gallon, outdoor, open-top, flow equalization tank. An HLDA300 blower unit was installed inside the wastewater treatment building, with 200 feet of two-inch distribution hoses placed around the top perimeter of the tank. 

2. Dissolved air flotation (DAF) unit inside the wastewater building. An HLDA100 unit was installed with two-inch distribution hoses located around the DAF perimeter and above the skimmer paddles. 

Air-driven/vapor phase odor control systems like HLDA100 and HLDA300 have several advantages: 

  • No water is needed 
  • Operate year-round 
  • No freeze protection needed 
  • No spray nozzles 


On the first day after odor control installation, there was already noticeable improvement. By day 15, the location of the treatment and the air flow were adjusted, causing a further decrease in odor. The odor was not noticeable inside or outside the plant by day 30.  

One employee said:

“My clothes no longer have a septic smell requiring me to change before I enter the house. I no longer must shower immediately upon entering the house when I get off work… My car no longer smells like the septic activity in the plant. It smells normal.”

Results are examples only. They are not guaranteed. Actual results may vary.