Substrate processing

Optimizing methane yields

Breaking up organic material

Organic/animal waste and many other substrates first need to be optimally processed before they are ready for use in biogas production. The intensive mechanical pre-processing results in faster gas yields by increasing the substrate surface while also acting to stabilize the fermentation process.

Our Biogrinder (type RBG) delivers a homogeneously shredded, flaky and well-defibrated substrate with a large particle surface. This significantly accelerates gas production by micro-organisms in the fermenter. Even feed materials that are considered difficult or impossible to recycle can be processed, providing access to low-priced raw materials. Other advantages include reduced agitator use and a reduction of floating layers. The grinder is built for continuous operation, features a rugged design and is easy to operate and maintain.

Benefits at a glance:

  • Optimum crushing, shredding and homogenization of input material
  • Increased methane yield
  • Shorter agitator times and lower power consumption
  •  No deposits build up in the fermenter
  • Greater variety of raw materials
  • Low maintenance requirements
  • Sturdy
  • Continuous operation

Wide array of substrates and raw materials

2014-04_ RBG-bei-Kinzner_12.psd

Wide array of substrates and raw materials

The substrates used as raw material for biogas production vary widely by country and based on the type of agriculture practiced there. Even non-typical raw materials such as water hyacinths, empty fruit bunches (EFB), rice straw and whole tropical fruits can be used in a biogas plant if they are processed correctly. Our Biogrinder (RBG) is able to shred Philippine pineapple as well as it can domestic bioenergy plants.

It can also be used with a wide range of other materials. This includes domestic organic waste, animal waste (from cows, horses, poultry, etc.), food waste, packaged food, waste from restaurants/meat processing plants and renewable raw materials such as corn silage, whole-crop silage, grass clippings, sugar beets and fruit.

Application-specific configuration of solution


Application-specific configuration of solution

There are a wide range of substrates used in biogas production. They vary greatly in terms of structure and composition. Packaged food requires different machine features and setups than bioenergy crops. That’s why each Biogrinder is adapted to the specific application at hand: The degree of shredding and the intensity of the processing can be configured by adjusting the rotor speed and changing the number of hammers installed. Our team of specialists carry out extensive pre-testing on the relevant substrate at our test center.


BHS Biogrinder crushes and mashes organic domestic waste

BHS Biogrinder - Aus Biomüll wird Biogas EN.mp4

BHS Biogrinder crushes and mashes organic domestic waste

The BHS Biogrinder (type RBG) is used in the processing of biomass for biogas generation. The BHS Biogrinder is in use in southern Germany to crush and mash organic domestic waste. The upstream substrate processing speeds up gas production in the fermenter. Overall, the biogas plant operates more efficiently and reliably.

Machine portfolio

Biogrinder (RBG)

Efficient processing of biomass for biogas generation

Biogrinder (RBG)

Efficient processing of biomass for biogas generation

Success stories

An environmentally friendly alternative to peat: The Biogrinder efficiently processes compost

February 2021
The Biogrinder from BHS-Sonthofen is successfully used by a cooperative in northern Germany for the production of an alternative to peat. A mobile plant with a control system from BHS Control Systems was implemented. The plant efficiently shreds surpluses of compost material and produces a substance that is suitable for use as an environmentally friendly alternative to peat. For example, the product is added to the production of potting soil to reduce the amount of peat contained in it.

First Biogrinder for India's biogas industry

December 2019
India generates a large amount of agricultural waste, including crop residues. As burning organic waste is considered to be a major cause of air pollution, the government of India has been offering incentives to mitigate the pollution problem and convert rice straw that is widely available in India into biogas. “Especially in northern part of India, rice straw will be an important raw material for biogas production”, says Neelesh Desai, Managing Director of BHS-Sonthofen India.

Biogrinder for biomass treatment plant

May 2019
The Association for Waste Management Kempten put a biomass treatment plant into operation in 2019. Technology worth about €2.8 million in total ensures that foreign matter is optimally removed from organic waste and green waste to prepare it for fermentation. A BHS-Sonthofen Biogrinder is now used to process and shred this material. Its low power consumption and exceptional shredding results, even for challenging input material, are what make it stand out.

Technical articles in the media

Efficiency in biogas generation

October 2020
BHS-Sonthofen has launched a new, completely redesigned version of the succesful Biogrinder on the market. The Biogrinder is used in biomass processing, where it ensures that biogas is generated efficiently and production is accelerated. The machine is now fitted with a disk rotor and stainless-steel components, making it stand out thanks to its improved durability and flexibility.
recovery, 5 | 2020


IERC 2023

1-18-2023 - 1-20-2023
Visit us on booth 1

Pollutec 2023

10-10-2023 - 10-13-2023

Satisfied customers worldwide


Find a sales representative

Find your personal contact person on site. We are there for you worldwide.

Find a sales representative

Find your personal contact person on site. We are there for you worldwide.