A Comprehensive Review of a Wastewater Treatment Plant Equipment List

Designing, building, and commissioning a wastewater treatment plant is no small feat, especially with the number of options available for equipment used to treat wastewater. It can be challenging to choose the right wastewater treatment plant equipment list for your needs.

Taking the time to understand the importance of different kinds of wastewater treatment plant equipment and what they offer is crucial to making an informed decision. This comprehensive guide reviews everything that should be  part of your wastewater treatment plant equipment list, as well as the benefits and fundamental considerations for each. With this information,  you’ll be able to make the best decision for your wastewater treatment needs.

What Is a Wastewater Treatment Plant?

A wastewater treatment plant is a facility that treats sewage and wastewater from homes, businesses, and industries. Wastewater is any water that has been used that may contain substances clean water doesn’t have, like pollutants..

There are many different types of wastewater, including:

  • Blackwater: wastewater that contains human waste
  • Greywater: wastewater from laundry, dishwashing, and showering
  • Stormwater: runoff from rain or melting snow

Wastewater treatment plants remove these pollutants from the water before it is released into the environment.

What Are the Benefits of a Wastewater Treatment Plant?

Wastewater treatment plants offer many benefits, including:

Prevent Waterborne Diseases

Wastewater treatment plants remove harmful bacteria and other pollutants that can cause waterborne diseases. Insufficient treatment can result in the spread of these diseases through contaminated water and increase the resistance of microbes to drugs.

A few examples of waterborne disease include:

  • Cholera
  • Dysentery
  • Hepatitis A

Reduce Water Pollution

Wastewater treatment plants also help reduce water pollution. By removing pollutants from wastewater before it is released, these plants prevent contamination of freshwater sources.

This, in turn, protects the environment and the wildlife that rely on these water sources.

Some common water pollutants removed by wastewater treatment plants include:

  • Bacteria
  • Heavy metals
  • Nitrogen and phosphorus
  • Sediment
  • Oils

An important part of water & wastewater treatment isis maintaining proper pH levels. With the normal pH for water being 6.5, wastewater treatment can help to regulate these levels and prevent them from becoming too acidic or alkaline.

Reduce Odors

With the help of biological and chemical scrubbers,  wastewater treatment plants can reduce odors from sewage. This is important for both the environment and public health, as strong odors  from wastewater can cause unpleasant living environments, and in some cases, respiratory problems. Treatment facilities also have the option to confine, control, and transport odors to scrubbers for destruction.

More Efficient Use of Water

Wastewater treatment plants help to make water more efficient by recycling wastewater for non-potable & potable uses. This includes using treated wastewater for irrigation, industrial cooling, and more. Recycling wastewater helps to conserve freshwater resources and reduce the strain on the environment.

The Different Types of Wastewater Treatment Plant Equipment

There are three main types of wastewater treatment plant equipment: primary, secondary, and tertiary. 

Primary Treatment

Primary treatment is the first stage of wastewater treatment. It involves removing large pieces of debris, such as sticks and leaves, from the water. This is typically done with a screen or grit chamber.

After the large debris has been removed, the wastewater is then sent to a primary settling tank. Here, gravity is used to settle out heavy particles, such as sand and grit. The wastewater is then sent to a secondary treatment system.

Secondary Treatment

Secondary treatment is the second stage of wastewater treatment. It involves using bacteria and other microorganisms to break down the remaining pollutants in the wastewater.

This is typically done in one of two ways:

  • Extended aeration: wastewater is aerated (or mixed with air) to provide oxygen for the microorganisms. The microorganisms then break down the pollutants in the wastewater.
  • Activated sludge: wastewater is mixed with microorganisms in a tank. The microorganisms break down the pollutants in the wastewater and are then removed from the wastewater.

Tertiary Treatment

Tertiary treatment is the third and final stage of wastewater treatment. It involves using physical, chemical, and biological processes to remove the remaining pollutants in wastewater.

Some common tertiary treatment processes include: 

  • Adsorption: wastewater is passed through a bed of activated carbon, which removes pollutants from the wastewater.
  • Membrane filtration: wastewater is passed through a membrane, which removes pollutants from the wastewater.
  • Biological treatment: wastewater is treated with microorganisms to remove pollutants from the wastewater.

How to Choose the Right Wastewater Treatment Plant Equipment List

When choosing wastewater treatment plant equipment, there is a lot to consider. Here are three important factors to keep in mind:

Consider Your Treatment Goals

Start by thinking about your treatment goals. You can use the following questions to narrow down your options:

  • What do you want to remove from the wastewater?
  • What are your effluent discharge requirements?
  • What are your wastewater treatment regulations?
  • How much wastewater do you need to treat?

Your treatment goals should be the main deciding factor when choosing a proper wastewater treatment plant equipment list. Once you have a good understanding of your treatment goals, you can start zoning in on your budget. 

Consider Your Budget

Wastewater treatment plants can be expensive, so it’s important to consider your budget when choosing equipment. If you’re on a tight budget, you may want to consider using certain types of wastewater treatment plant equipment over others.

As one example, you may be able to save money by choosing wastewater treatment plant equipment that is designed for your specific wastewater treatment needs. For instance, you may be able to get by with a smaller secondary treatment system if you have a good primary treatment system in place.

Early-stage cost estimation of the wastewater treatment plant can help you stay within your budget while still meeting your wastewater treatment goals.

Consider the Size of Your Treatment Facility

The size of your wastewater treatment facility will also play a role in choosing the right wastewater treatment plant equipment. If you have a small wastewater treatment facility, you may not need as much wastewater treatment plant equipment as a larger facility.

You’ll also want to consider the layout of your wastewater treatment facility when choosing wastewater treatment plant equipment. For example, you may need to choose compact wastewater treatment plant equipment if you have a small footprint. 

A cost effective way to decide the size of your treatment facility while factoring in your budget is by building a 3D model of your wastewater treatment plant. This will give you a good idea of the equipment you need and how much it will cost.

Transcend Design Generator allows you to do just that. With our wastewater treatment plant design software, you can automatically create a three-dimensional model of your wastewater treatment plant and see how different pieces of equipment will fit in your facility.


There is a lot to consider when choosing wastewater treatment plant equipment. However, if you start by thinking about your treatment goals, budget, and the size of your treatment facility, you’ll be well on your way to choosing the right wastewater treatment plant equipment for your needs.

Transcend offers a wide range of solutions for building and designing wastewater treatment plants. One feature is the ability to automatically create a three-dimensional building information (BIM) model of your wastewater treatment plant, which is a great tool for choosing the right wastewater treatment plant equipment. With our software, you can easily find the right equipment for your wastewater treatment plant and save money in the process.

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