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What is Biogas Scrubbing? Waste Gas to Energy Explained

by Reece Mitchell on February 14, 2020

As more industries look to biogas solutions to power their projects, it’s critical to consider the quality and experience of the company behind the biogas solution for your commercial needs.

At Eneraque, we have proudly offered waste-to-energy power generation solutions for nearly 40 years and have produced a number of cutting-edge commercial waste-to-energy projects which boast world-class results and have helped shape the Australian market.

In one of our most recent biogas projects on a major NSW Dairy Farm, the results from the first major service were noteworthy. A brief summary:

  • Eneraque was tasked to provide a turnkey system to take the biogas from digesters and provide electricity to parallel with the grid and recover the waste heat from the generator plant to heat the digestor.
  • Extremely satisfied customer
  • First service; excellent results


  Run Time Oil Change Spark Plugs
Generator 1 4040 Hours Yes Clean & Reuse
Generator 2 3843 Hours Yes Clean & Reuse


This project used a process of turning organic matter (biomass) that would have otherwise been wasted, into energy. This is accomplished by converting organic waste (Which would otherwise have been disposed of) into useable, clean, valuable renewable energy.

This was achieved through the use of the biogas biological scrubbing system, supplied, engineered and installed in Australia by Eneraque. These biogas scrubbers emit biogas that is captured and cleaned (scrubbed) to remove impurities.


What is biogas?

Biogas is a renewable energy source and contains 50-70% methane (CH4), 30-50% Carbon Dioxide (CO2) and 0.1% to 3% (1,000 to 30,000 ppm) Hydrogen Sulfide (H2S). When the H2S is removed biogas can be used for power and heat production or upgraded to natural gas quality (Biomethane)


What is the process?

The process of biological gas scrubbing is far more cost-effective and environmentally friendly than more traditional chemical scrubbing methods. For these reasons, Eneraque consistently opts for the more conscious, natural process biological gas scrubbing offers.

The process begins with breaking down the organic waste through anaerobic digestion. This process reduces the (coarse) solids content of the waste (typically by 50-80%) which simplifies and reduces the costs of handling the digestate. The byproduct of anaerobic digestion is biogas.

Biogas Scrubbing begins with the capture of biogas as a result of anaerobic digestion. Hydrogen Sulfide (H2S) is then removed by injecting atmospheric air into the scrubber tank, which allows bacteria to naturally oxidise the compound to sulfate and elemental sulfur.

From there the biogas passes through an Eneraque dehumidifier to remove any moisture, resulting in the production of a clean-burning, quality gas. Further treatment of the biogas through the removal of Carbon Dioxide can facilitate the production of a pipeline quality gas called Biomethane.


What is the result?

Biomethane is a versatile gas that can be used as a fuel, for heating as well as being pure enough to send back into the grid via pipeline when it is produced in excess of the closed system’s consumption requirements.

Eneraque has achieved commercial excellence in biogas scrubbing, with quantifiable results that speak for themselves. See the Design Data and Actual Gas Treatment results breakdown below:

Design Data:

Max. H2S Level
Raw Biogas 4,000ppm
Clean Biogas 150ppm


Actual Data:

Max. H2S Quantity
Raw Biogas 2,840ppm
Clean Biogas 7-10ppm


Eneraque holds true to the fact that there is an array of benefits through using an experienced waste-to-energy engineering service that can not only design but build, install and maintain your biogas project.


The key drivers for existing biogas plants in Australia have been:

  • reducing odours from abattoirs or rendering plants
  • generating electricity for landfill sites, rendering plants and wastewater treatment plants.
  • Methane capture and carbon offsets
  • Selling excess energy as a passive revenue stream
  • Carbon Pricing Mechanism (CPM)
  • Fertiliser production

Find out more about our waste-to-energy solutions and results by talking to a team member. Eneraque specialise in delivering tailored solutions backed by an unbeatable experience.

For comprehensive biogas and waste-to-energy services, contact our friendly team of Waste Gas to Energy Specialists today.