As mentioned in a previous article (How to Reduce Biogas Losses) biogas can cause havoc if it is exhausted into the atmosphere. It not only means there is something fundamentally wrong with the process, but it also means that it can cause damage to the environment and humans. This can lead to large fines and complications.
Technical Measures to Mitigate Losses
- Ensuring seals are achieved where necessary. This can include valves, joints, fittings and any other hardware that has the potential to cause leaks.
- Covering process tanks with gas-tight covers. This can include process, storing or mixing tanks.
- The process designer will take into consideration plant emissions during the design phase of the plant. Through this, they can incorporate emission-reducing technology and also look at relevant pipework.
- The need for regular maintenance is essential and the replacement of any dome membranes is key to ensuring there is no biogas leak from any tank in the process. The membrane should be checked for permeability and also replaced as per the manufacturer’s recommendation.
Operational Measures to Prevent Biogas Losses
- Regular maintenance and inspection procedures to check for leaks
- If new components are installed then a check for leaks after this has taken place is essential
- Regular maintenance of the CHP unit needs to be carried out to ensure there is no chance of gas leaks
- Ensure the feedstock isn’t fed in too close to the planned maintenance period otherwise it heightens the chances of biogas getting into the atmosphere
- Regular maintenance of hardware e.g. vales and gas equipment to ensure that all seals are still in check and prevent biogas leaks
- Ambient temperature effects due to different weather e.g. weathering of membranes
- Aeration post-treatment
- Emissions testing and recording measurements with an action plan if needed
Biogas leaks are important to mitigate. Through routine checks and planned maintenance, these potential risks can be stopped. When maintaining the plant and equipment it must be done by a competent person. Regular routines along with system monitoring means operators and plant owners can significantly reduce the risks of biogas losses.
Reference – Roots Organics Ltd
