Kim
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As a general rule of thumb, flowrates less than 1500 scfm find membranes to be a cost effective method for producing RNG. At higher flowrates, technologies such as PSA and amine systems may be better options. For all of these systems, the quality of the biogas and purity requirements of the utility play important roles in which technology is the best for each project.
In the U.S., we’ve worked with groups that had multiple farms combine their waste into one digester with treatment facility. Others have chosen to have individual digesters with H2S and moisture removal on site and then pipe the biogas to a central system for removal of CO2. Both of these approaches required cooperation from multiple farms, and resulted in successful RNG production.
There are many factors to consider with a virtual pipeline. Here are some examples: Additional compression equipment will be needed to fill the tube trailers. The shorter the distance from the treatment facility to the injection port, the lower your CI score. Agreements with the individual utility receiving the gas are also an important consideration. These are only a couple of the many questions that may arise when considering this type of set up.