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Many degradable substances such as cellulose, hemi cellulose, proteins and starches are not readily accessible to the anaerobic biology when presented in various substrates. The addition of certain enzymes ensure that the necessary enzymatic steps are completed in order to maximise biogas yield from substartes. These include the exposure and breakdown of cell membrane molecules and reduction of the so called cross links and separation of high energy metabolites. Once these steps are completed decomposition takes place rapidly and efficiently, improving gas yield without the need for increased retention time.

The BC.ZYM range of enzyme are specially optimised for individual sustrate degredation within the biogas process. The BC.ZYM products are active ingredient complexes from specific biocatalysts (enzymes and co-factors) which accelerate the decomposition of organic substrates or even simply make it possible.

Dual Purpose

Enzymes have two benifical uses within the anaerobic digestion process:

  1. To speed up the breakdown of feedstock. This means more gas in a given time. However this is only important for plants with a limited retention time.
  2. To reduce viscosity. As the video below shows, the use of enzymes break down material to ensure it can be properly mixed, reducing the chances of process instability and load and wear on mixers and pumps.

Retention Time

Enzyme assist in the break down hard to digests materials in the digester. This reduces the retention time requiremnt for the plant and allows an increase organic loading rate into the digester.


Generally speaking higher dry matter within a digester will lead to higher viscosity. This can cause a number of issues:

  • increased costs due to additional energy requirement for mixing and pumping
  • increased wear on stirrers and pumps
  • reduced levels of mixing leading to gradients of temperature, nutrients, organic acids and gas distribution in the digester

This leads to:

  • process instability
  • increased levels of substrate bypass into secondary tanks
  • swimming / sinking layers