Analysis of the Supply with Micronutrients in Biogas Plants – Expensive and Useless?

The analysis of the micronutrient concentrations in the digester supplies no usable information about the level of supply of the digester biology. These costs can be saved. The use of individual mixtures makes no sense, as the level of supply cannot be sensefully detected. A safe micronutrient supply of the digester biology is only possible by the correct addition of a defined product adjusted to the growth of the bacteria population.

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My Story With the Use of Micronutrients in Biogas Plants

We develop and pursue the use of micronutrients or essential trace elements since over 25 years. The experience shows, that micronutrients as Acinor 1000 lead to an improvement of the process stability in all plant types, also with the use of liquid manure. High loading rates are only feasible with the addition of micronutrients.

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Selfheating and Cooling of Digesters

When I started constructing and commissioning the first high-loaded biogas digesters (digester load 8-10 kg oDM/cbm/d) in 2005, an unexpected phenomenon appeared – the digesters warmed up by themselves in summer without activated heating. The real problem was the too fast increase of temperature, leading to a breakdown of the biology. In a few weeks the planned digester temperature of 39 °C increased to 43 °C, and the digester biology suddenly became unstable.

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Dr. Hans Friedmann

Martina Schweiger

Martina Schweiger

Matthias Plöchl