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Ask the Wastewater Expert

Daniel L. Theobald

Known in the industry as “Wastewater Dan,” Daniel L. Theobald, proprietor of Environmental Services, is a professional wastewater and safety consultant/trainer. He has more than 24 years of hands-on industry experience operating many variants of wastewater treatment processing units and is eager to share with others his knowledge about water conservation. (www.Conserve-On-Water.com).

Theobald serves as an active consultant for industries looking to achieve and maintain improved wastewater treatment at reduced cost. He is a Lifetime Member of the Who’s Who Registry of Professionals and holds numerous certifications from wastewater management regulatory boards and professional organizations. Theobald contributed one chapter to the Water Environment Federation’s (www.wef.org) Manual of Practice # 37 (MOP-37), a technical manual resource guide for biological nutrient removal, published the summer of 2013. He also publishes educational videos (https://www.youtube.com/user/wastewaterdan/) and authors two blogs: Wastewater Education; (http://TheWastewaterWizardBlog.com/) and Water Status (http://WaterQuantityandQualityBlog.com/).

In primary treatment, what are the pH process controls for treating wastewater?

The measure of free hydrogen activity in water -- called “pH” for “potential for hydrogen” -- is undoubtedly the most important and most-used wastewater treatment measure. Dependence on pH as a measure relevant to water quality and its control occurs in practically every phase of water supply and wastewater treatment, including acid-base neutralization, water softening, precipitation, coagulation, disinfection and corrosion control.
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Microorganisms in activated sludge

Someone recently asked, 'What microorganisms are in activated sludge?'
In the activated sludge process, microorganisms are mixed with waste water. The microorganisms come in contact with the biodegradable materials in the wastewater and consume them as food.
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Activated-sludge troubleshooting guidelines

Someone recently asked, “What are some troubleshooting guidelines or procedures for overall process control of activated sludge?”
Someone recently asked, “What are some troubleshooting guidelines or procedures for overall process control of activated sludge?”
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Procedures for overall process control of activated sludge

To control activated sludge, you need to “have a handle” either on aeration, sludge-wasting or return-sludge flow. Aeration-rate adjustment is probably the simplest way to go, says Wastewater Dan. But he briefly reviews all three methods in today’s blog.
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