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Articles by Daniel L. Theobald

What do dairy, pulp & paper and textile have in common?

High organic waste loads and large wastewater volumes characterize three disparate industries; but how are they different?
Process controls for treating wastewater in dairy, pulp & paper and textile industries use secondary treatment, most commonly activated sludge, to remove soluble, i.e., dissolved pollutants.
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Control of activated sludge, including troubleshooting

The what and wherefores of a well-known process, simply explained
Activated sludge isn’t a thing, it’s a process. As a sewage and industrial wastewater treatment, it makes use of air and a biological floc composed of bacteria and protozoa.
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Batch and continuous pH control compared and contrasted

Someone recently asked, “What are process controls for adjusting and maintaining pH during wastewater treatment?”
The pH is one of the most important and frequently used measurements in wastewater treatment. Dependence of pH occurs in practically every phase of water supply and wastewater treatment, e.g., acid-base neutralization, water softening, precipitation, coagulation, disinfection and corrosion control.
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