- May 1, 2022
- 10 min
Nitrogen Testing and Alkalinity Control
In this post I focus on aspects of laboratory testing and plant operation that relate to nitrification, a topic I am endlessly fascinated...
- Apr 3, 2021
- 4 min
Cell Generation Time
Bacteria are amazingly complex, even though each is comprised of only a single cell. Bacteria make up about 95 percent of all the...
- May 25, 2020
- 7 min
Increase DO in a Bioreactor with Hydrogen Peroxide & GPS-X Simulation
Introduction Hydrogen peroxide can be used to increase the dissolved oxygen (DO) concentration in an aerobic bioreactor, often referred...
- Sep 10, 2019
- 8 min
Estimating RAS TSS
Introduction In this post I'm going to discuss how you can estimate the solids concentration in the return activated sludge (RAS) using...
- Jan 2, 2019
- 10 min
Bioaugmentation
Detailed Review of Bioaugmentation Bioaugmentation is the addition of a specially prepared bacterial culture to a bioreactor (aeration...
- May 2, 2017
- 2 min
The Nitrogen Cycle
Three graphics of the nitrogen cycle are shown in this short, simple post. The first graphic below is one of the most common and you will...
- Dec 19, 2016
- 6 min
Food-to-Mass (F:M) Ratio
Introduction Before going into a detailed discussion of the F:M (food-to-mass or food-to-microorganism) ratio I want to let you know...
- Sep 26, 2016
- 9 min
Wastewater Temperature
Wastewater Temperature in the Bioreactor Operators know that when the temperature of the wastewater entering the bioreactor is too high,...
- Sep 5, 2016
- 1 min
Activated Sludge Table
Activated Sludge Design Parameters This is a handy chart from the well-known Metcalf & Eddy handbook (Metcalf & Eddy. Wastewater...
