Skip to main content

"Oxygen and Utilization"

Mike Baumgartner, Wastewater Specialist
Mike Baumgartner
Wastewater Technician

By: Mike Baumgartner, ARWA Wastewater Technician

Dissolved oxygen or D.O. is a term we use in the wastewater business quite often. It is one of the big three parameters we control in order to have a successful process. The other two are control of organics (food) and population of microorganisms. Let’s discuss D.O. and how it is utilized.

It is a measure of the amount of free oxygen present in wastewater or mixed liquor expressed in mg/l. Remember, mg/l is the same unit as ppm. Because the treatment process is considered an aerobic condition, our goal is to maintain a metabolic process that produces energy for growth and reproduction. It is important to recognize that after the microorganisms consume their demand for oxygen there is a residual left over. That is the number you read on the meter. It can be expressed as: Supply – Demand = Residual.

Why is this important? We all have read that the D.O. in an aeration basin should run from 1.0 to 3.0 mg/l. Let me suggest to you that anything over that is a WASTE of energy and money. You will get no more benefit. The 1.0 to 3.0 mg/l should be maintained because it is the “bugs” driving force in performance. If you are having issues nitrifying and the ammonia levels are rising – it is most likely a D.O. problem. Remember, nitrifying bacteria need oxygen to work so feed them the driving force – D.O.

First appeared in Waterline, Spring 2015

- More News -

 

 

2020 Conference Cover

ARWA's 42nd Annual Technical Training Conference

Mobile, Alabama

March 15-18, 2020
- More -

 

Open for Registration

  
Lab Testing Procedures with Hands-On Training (WW)
February 27-Livingston
Save the Date!
  
ARWA's 42nd Annual Technical Training Conference
Mobile, Alabama

March 15-18, 2020
Registration is Open!
  
Sustainable Utility Management (W/WW)
May 14-Auburn
Learn More
  
Water University
Utility Management Certification

Learn More
  
Schedule your own
On-site CEH Training

Earn CEHs
  
Plan for future training!
Training Calendar
 

 

   
Secure Certificate To provide you with additional protection, we have installed a Secure Certificate which authenticates the ARWA website and encrypts transmitted data such as your name and contact information.

 

 

Water Loss Protection

The ARWA/NRWA ServLine Program protects your utility against losses from customers’ water leaks, and provides the opportunity for them to add service line repair replacement protection. Learn more.

 


ARWA

Alabama Rural Water Association is a non-profit organization representing water and wastewater systems serving rural communities and towns and commercial firms which support these systems.

We provide assistance to comply with State and Federal regulations, to help with management and operational problems, and to stimulate training initiatives.

Learn more about us.

GET IN TOUCH

Alabama Rural Water Association
2576 Bell Road
Montgomery AL 36117 
Phone: (334) 396-5511
Fax: (334) 396-7090 
Email: arwa@alruralwater.com
Website: www.alruralwater.com