Request Service Today

How does Anaerobic Wastewater Treatment work?

Anaerobic Treatment Process

Anaerobic treatment is a biological treatment process in which microbes convert the organic matter in the absence of oxygen. The anaerobic bacteria digest the biodegradable matter present in the wastewater.

How does it work?

Anaerobic wastewater treatment is a wastewater treatment process wherein bacteria are used to break down organic matter. These systems usually include a chamber in which an oxygen-free environment is maintained. The resulting effluent has reduced chemical oxygen demand (COD), biological oxygen demand (BOD), and total suspended solids from the wastewater. Anaerobic treatment is used before aerobic treatment so the high concentration of organic material is removed effectively.

The organic matter is converted to biogas, i.e. methane and carbon dioxide. As the bacteria work on the wastewater, biogas is generated which can be used to generate electricity in some situations. The sludge is sometimes used as a compost and fertiliser in the agricultural industry. In general, both aerobic and anaerobic treatment methods are used together for the effective removal of contaminants.

It is used to treat wastewater from different industries like:

  • Agriculture
  • Food and beverage
  • Pulp and paper
  • Dairy
  • Municipal wastewater

Types of Anaerobic Wastewater Treatment Systems

Some of types of anaerobic systems include:

  • Anaerobic Lagoons
  • Anaerobic filter reactors
  • Anaerobic sludge blanket reactors
Looking for a Wastewater Treatment System? Let our wastewater experts help you.

Difference between Aerobic and Anaerobic Treatment

Both methods use bacteria to treat wastewater.

In aerobic systems, oxygen is used whereas anaerobic systems do not require oxygen. Different types of bacteria are utilised in each system.

Advantages of Anaerobic Treatment System

  • Biogas is produced during the process which can be used as a source of renewable energy
  • Requires less energy compared to the aerobic treatment process
  • Less amount of sludge is produced so the cost of sludge disposal is significantly reduced
  • Low amount of chemicals are required to treat the waste
  • It can handle a high volumetric load of chemical oxygen demand (COD)
  • It can reactivate immediately after the substrate is added even after a long shut down period

Your Local Wastewater Experts

Are you looking for advice on wastewater systems? Express Wastewater Solutions are industry professionals when it comes to completing professional septic systems, sewage treatment systems, wastewater systems - installations, repairs and maintenance. We can help with the design and installation of the right wastewater system for your needs.

Give us a call on 1300 722 517 or complete our quote request form.

How does Anaerobic Wastewater Treatment work? Let our experts help you.

Not what you're looking for?

Try our search below for more information relating to septic, sewage and wastewater systems.

Search Help Section by Service

Search our information section by a specific service. Simply click the tile below.

Septic Tanks

Sewage Systems

Wastewater Treatment

Why Use Express Wastewater Solutions?


    Because we are not a manufacturer and not tied to one particular system we can always offer the best solution for your wastewater needs.


    Because we do this every day we have developed a close knit expert team for every step of the process – from plans and council paperwork to excavations, electrical and plumbing. We handle it all to make the whole process as stress free and quick as possible.


    Most people have never installed a home sewerage treatment plant and don’t know the next step, that is why we offer a free 30 minute phone consult with one of our experts to point you in the right direction.


    We handle your wastewater installation from start to finish we can deal with all the trades, council everything so you don’t have to worry about a thing.


    Have peace of mind knowing that Express are licensed, insured professionals that will do your job right the first time.


    Not sure what system is right for you, or want to know if your system is working properly? Just give one of our friendly wastewater experts a call and they will be more than happy to help.


    We will always look to repair your system rather than replace it if it does not need to be, which will generally save large amounts of money sometimes up to and over $10,000.