Biological wastewater treatment, also called activated sludge treatment, is one of the most common and efficient ways to treat wastewater.

It relies on a variety of microorganisms to break down organic matter in the wastewater and convert it into carbon dioxide, water, and biomass.

Biomass can be burned to generate energy or used to produce fertilizer. Biological wastewater treatment is often combined with other treatments such as filtration and chlorination to reduce pollutants in the wastewater before it is released back into the environment.

Biological wastewater treatment is a critical step in purifying water for both drinking and industrial purposes.

In this process, microbial populations decompose organic matter within the wastewater, removing pollutants and reducing the overall biological oxygen demand (BOD).

When properly implemented, this process can result in reclaimed water that meets drinking water standards. While there are many different methods of biological wastewater treatment, each has its own benefits and drawbacks.

In order to choose the best method for a given situation, it is important to understand these differences.

Biological Wastewater Treatment

What is biological wastewater treatment?

Biological wastewater treatment is the process of using microorganisms in the environment to decompose organic waste in the water. Wastewater is biologically treated by organisms called bacteria and fungi (fungi cause organic solids to break down).

To implement a bioreactor, inorganic materials such as sand, gravel, and carbon are typically added to wastewater to promote bacterial or fungal growth.

This process is beneficial because it can be used to break down a variety of materials and is environmentally friendly. Biological wastewater treatment is mainly divided into three steps: pretreatment, biological treatment, and disinfection.

Wastewater basically contains organic matter such as waste, garbage, and partially digested food. When these microorganisms break down organic impurities in food, flocculation occurs, causing the organic matter to settle out of the solution.

Manageable sludge is produced during this process, which is then dewatered and disposed of as solid waste. In addition, in many cases,

What is biological wastewater treatment

Biological treatment is generally divided into aerobic and anaerobic processes. “Aerobic” refers to processes in which oxygen is present, while “anaerobic” refers to biological processes in the absence of oxygen.

Scientists have been able to control and improve aerobic and anaerobic biological processes for the optimal removal of organic matter from wastewater.

Biological wastewater treatment is often used as a secondary treatment process to remove materials remaining after primary treatment through processes including dissolved air flotation (DAF).

During primary water treatment, substances such as sediment and oil are removed from wastewater.

What are the benefits of biological wastewater treatment?

The biological wastewater treatment process is a natural process that helps protect the environment. Compared with traditional methods, biotechnology in wastewater treatment is more cost-effective and the quality of effluent is improved.

It protects the environment and the public from the harmful effects of discharging untreated sewage.

In addition, it allows the reuse of waste as an energy resource. In order to keep the environment safe, it is very important to carry out biological wastewater treatment.

What are the benefits of biological wastewater treatment

Waste reduction and energy saving

The cost of aerobic treatment is increasing year by year. Microbiology is at the forefront of wastewater treatment. The reduction in influent biochemical oxygen demand (BOD) load and the presence of naturally derived soil microorganisms greatly reduces energy costs.

Environmental protection

Wastewater is full of harmful substances. Biological wastewater treatment improves the health of the environment by reducing the amount of waste normally released into the environment. It reduces water loss caused by water pollution.

Environmental protection

Sludge reduction

Fats, oils, and greases (FOG) require a more invasive way of breaking down. Stubborn sludge build-up can damage equipment and can lead to breakdowns, inefficiencies or increased service demands.

Microbial solutions are able to degrade FOG while reducing the flammable gases that accompany it.

Energy production

Sludge collected during wastewater treatment contains a lot of biodegradable substances. The gas produced during the treatment of these substances by anaerobic bacteria contains large amounts of methane. This methane is collected and burned to generate electricity.

What are the types of biological wastewater treatment?

Biological wastewater treatment utilizes a wide range of microorganisms to break down organic waste into water and carbon dioxide.

The following are examples of some common types of biological wastewater treatment systems, including a brief description of how they function in industrial wastewater treatment scenarios, to give you an idea of the types of technologies and systems that may benefit your industrial facility.

What are the types of biological wastewater treatment

Anaerobic digestion

Anaerobic treatment involves the functioning of microorganisms in the absence of air. It’s a complex process that also helps digest nutrient waste. In addition, by-products of the process include carbon dioxide and methane that contribute to the formation of biogas.

Aerobic digestion

Aerobic digestion is a process that breaks down organic matter in wastewater, turning it into a reusable resource.Which helps the environment by eliminating the need for untreated wastewater that would otherwise go to the landfill.

Biological activated sludge

Biological activated sludge is a biological activated sludge process that uses a combination of aerobic and anaerobic biological processes.

It recovers energy and nutrients from the waste that is produced. And is very energy efficient.

Biofilm reactors

A biofilm Reactor is a proven, easy way to keep your aquarium clean and healthy while using less water.

It effectively and gently removes harmful bacteria, parasites, and another biofilm without chemicals.

Biological wastewater treatment

Biological wastewater treatment is one of the most organic methods to treat water. This type of filtration is typically used in municipal water treatment systems, but can also be used to filter water at home.

Biological wastewater treatments use living organisms to break down complex molecules into more basic molecules and is ideal for treating water in homes.

The high flow filter for biology is in the last step of filtration before reverse osmosis if the water needs to be treated for drinking.

Biomass gasification

Biomass gasification is the process of converting biological materials and plant biomass into combustible gas or syngas. This gas can be used to generate heat, gas for fuel, and even electricity.

Wikipedia reports that in 2016 biogas gasification was the largest source of renewable energy in the world.

Biomass gasification has many advantages over other forms of renewable energy because the biomass created can be used to create multiple forms of energy.

Biomass gasification

Membrane bioreactors

Membrane bioreactors are a type of filter that uses active membrane material to remove contaminants. These filters can be used in many applications such as water filtration or in medical settings

Membrane bioreactors

No matter use which method of Biological wastewater treatment, if the final water needs to be treated for drinking, high flow cartridge filter is a good choice for prefiltration to remove most contaminants and particles.

Rotating biological contactors

Biological contractors come in different sizes, depending on the size of your tank. The main goal of a biological contactor is to provide a good way to filter your water, whether it is used in a breeder tank with a developing population, or in a smaller, less developed tank with a small population.

Biological contractors will help your fish stay, healthy and happy! These biological contactors come in a few different sizes, and they are very easy to install.

Rotating biological contactors

Trickling filters

Trickling filters are a low-cost and low-maintenance way to keep your pond clean and clear. Water is filtered through a series of progressively smaller pipes, where it is then recycled.

The smaller the pipe, the cleaner the water. This can be done over and over, so it’s not a one-and-done situation

The limitations of biological wastewater treatment?

The biological wastewater treatment process is a very complex process. This treatment has many limitations.

Small Scale

Biological wastewater treatment is not very effective for large volumes of water. This is one of the main limitations of biological wastewater treatment.

Biological wastewater treatment is not the best option when dealing with large water bodies such as lakes and reservoirs.

High Energy Consumption

Aerobic digestion requires aeration, which consumes a lot of electricity. Electricity is usually produced by burning fossil fuels that produce greenhouse gases.

Long Duration

Although anaerobic digestion of pollutants in wastewater leaves a small carbon footprint, it is a slow process. It is less efficient than aerobic digestion and removes 70% to 95% of organic pollutants.


We hope you enjoyed our blog post on biological wastewater treatment. We know that many people are concerned with the use of chemicals in their everyday lives.

This article gives you an overview of how biological wastewater treatment works and how you can use it to help get rid of toxic chemicals from your life.

Brother Filtration has over 10 years of experience custom designing and manufacturing wastewater treatment systems, so please feel free to contact us with your questions. For more information or to get in touch, please contact us here:[email protected]

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