quality bio gas, CO2, fumigation with CO2

Nieuws

Quality liquid CO2 for use in greenhouses

Gepubliceerd op
14 november 2014

A list of specifications for liquid CO2 from biogas is necessary to prevent phytotoxic components in biogas from coming with the CO2 flow into greenhouses and pose a risk to horticultural crops.

A list of gaseous components as well as an assessment of their phytotoxicity was complied, based on measurements carried out on waste gases from digesters. This screening indicated that some of these components have to be considered to be potentially phytotoxic.

Screening on phytotoxicity

A list of gaseous components as well as an assessment of their phytotoxicity was complied, based on measurements carried out on waste gases from digesters. This screening indicated that some of these components have to be considered to be potentially phytotoxic. In addition to this list, dimethyl sulphide and benzene were further tested in separate fumigation experiments for their phytotoxicity. Pepper and tomato plants exposed to a concentration range of the respective components for three weeks. The results indicate that pepper and tomato no negative effects such as visible leaf damage and growth reduction are to be expected after exposure to dimethyl sulphide concentrations up to 800 ppb, and benzene concentrations up to 650 ppb for three weeks.

Quality requirements for liquid CO2

The results also indicate that based on an estimated average concentration in the greenhouse at plant level, it is unlikely that the biogas will affect horticultural plants. With the list of possible risk components and the test on these two components, a start has been made in establishing specific quality requirements for liquid CO2 for use in greenhouses.