One of the best ways to prepare for any exam is to solve many practice problems. To help you study for your wastewater treatment operator certification exam, here are four practice problems. By the way, please keep in mind these problems are for anyone who is pursuing the first two certification levels. I included the …
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First of all, organic Loading questions are very common on operator certification exams. The great thing is that these problems are not complicated. Today, we’ll focus on a certain type of problem: organic loading into a pond. Here’s a video that shows you how to calculate organic loading into a pond. It’s a fairly …
In today’s post, we’ll learn how to calculate detention time. It’s a common question on the operator certification exam, so be sure to understand this concept. This applies to both water and wastewater treatment. For more help, enroll in our online courses or try these practice exams. So what is detention time? It’s …
In today’s post, we’ll show you how to calculate flowrate through a pipe. It’s a fairly simple concept, and only involves one formula: Flowrate = (Velocity of water) x (Cross sectional area of pipe) In the following video, I demonstrate how to calculate flowrate in a pipe. If you’re looking for practice problems …
In this article, we’ll solve a practice problem on percent removal efficiency . Simply put, it’s the amount of waste removed in percent format. For example, it can be used to calculate how much BOD was removed in the primary clarifier. Moreover, this concept can be applied to the removal of total suspended solids (TSS) …
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To improve your math skills, let’s solve a wastewater math practice problem. In this post, we’ll learn how to calculate the weir overflow rate of a primary clarifier. The weir overflow rate is used to determine the potential for high velocities over the weir. Wastewater moving at a high velocity would cause more solids to …
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Let’s face it. If math is your weakness, you’re going to cringe every time you think about the wastewater operator certification exam. It’s the last thing you want to think about, especially on the weekends. However, it’s important to start thinking about various aspects of the test before you walk into the exam center. In …
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In the following practice problem, we’ll learn how to calculate detention time. Simply put, it’s the amount of time the wastewater spends inside of a basin, such as a primary clarifier or a secondary clarifier. For example, if an influent spends three hours inside of a basin to get from the point of entry to …
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Food-to-Microorganism is a way to manage the activated sludge process at a wastewater treatment plant. It’s a common concept that is tested on the wastewater treatment operator exam, so make sure that you understand it before you take your exam. In short, it calculates the ratio of organics (BOD or COD) to the amount of …
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The following practice problem tests the basic concept of volatile solids reduction, which is a process that uses bacteria to break down volatile solids in the absence of oxygen inside the anaerobic digester. These volatile solids originate from the waste sludge, which is gathered from the primary and secondary treatment systems. After the volatile solids …
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The following is a wastewater math practice problem regarding Sludge Volume Index, also known as SVI. Most of the time, these problems are not complicated, but make sure you understand the formula that is used to calculate it. In order to prepare for your operator exam, try to work on many wastewater math practice problems …
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