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May 25, 2020

Introduction

Hydrogen peroxide can be used to increase the dissolved oxygen (DO) concentration in an aerobic bioreactor, often referred to as “DO supplementation.” Using peroxide is rarely a first choice because chemically increasing DO is more expensive than using a mechanical method (diffused aeration, mechanical mixing, etc.). But i...

December 19, 2016

Adenosine Triphosphate (ATP)—An Introduction

I’ve stated previously (OUR Level 1 Testing) that whenever I evaluate a biological treatment system there are two sets of tests I always run:

1) Oxygen uptake rate (OUR), and

2) adenosine triphosphate (ATP) analysis.

When combined, the results of the OUR and ATP analysis provide a very complete...

September 26, 2016

Wastewater Temperature in the Bioreactor

Operators know that when the temperature of the wastewater entering the bioreactor is too high, it can have an adverse impact on the microorganisms in the activated sludge system. How high a temperature is too high? There are many opinions on this subject so I thought I would combine my own expe...

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