Tag Archives: influent

The Walk Through

As an inspector for the Division of Water for over 10 years, I inspected wastewater treatment plants on a regular basis, and I had a method to my madness. It was easier for me to start at the beginning of … Continue reading

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Bar Screens

A bar screen is the first piece of equipment the influent wastewater comes in contact with at the treatment facility. It is described as parallel wires or bars that remove large untreatable objects, such as rocks, sticks and floatables, from … Continue reading

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Test Your Knowledge- Food to Microorganism Ratio

Since you have read the post Calculating Food to Microorganism Ratio, Let’s work an F/M problem for practice. A .75 MGD extended aeration plant has an influent flow of .325 MGD with an influent BOD concentration of 209 MG/L. This … Continue reading

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Calculating the Food to Microorganism Ratio

The food to microorganism ratio (F/M) is a process control tool that is used to help optimize the wastewater treatment plant. It is a ratio of pounds of biochemical oxygen demand (BOD) entering the plant (F) to the pounds of … Continue reading

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Conventional Activated Sludge

A conventional activated sludge plant (CAS) is the precursor to the extended aeration plants that are favored by smaller facilities (less than 15 MGD) in the Commonwealth today. The CAS normally begins with the following preliminary treatment processes: a screening … Continue reading

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Phosphorus Removal Via Oxidation Ditches

In an earlier post I mentioned changing the aeration setup at your facility to remove phosphorus. In this post, I will use the example of an oxidation ditch to expand further upon alternative aeration techniques. An oxidation ditch (OD) is … Continue reading

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Calculating Flow Into a Lift Station

Have you ever been working on a broken pump at a lift station and wondered how fast the water is entering the lift station or how much time you have before it begins to overflow? Well, I know some operators … Continue reading

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