Differences between RNG and biogas

What is the difference between biogas and Renewable Natural Gas (RNG)? RNG is produced for environmental friendly applications, such as fuel for cars, trucks but also for production of electricity and heating houses. Biogas grows where organics are closing the life circle and is entering environment. Most of this gas is CH4 (methane), which is a greenhouse gas. We should be aware that biogas production must be avoided for other reasons than to use it as a renewable gas. Swamps produces a lot of biogas as well as hobby wild park.

Today, small biogas capacities can effectively be reused for small residential areas for heating as long the gas is not aggressive for the burners. For example; in the Netherlands: gas produced by an average Dutch farmer can create enough heat to warm the houses of 100 residents. In summertime surplus gas can be used to transform in electricity. Although in all honesty I to say that this is more or less an environmental friendly gesture because electricity is rather cheap in the Netherlands.                                                                                                                   

Since the EU is subsidizing production of green gas (RNG) to be injected into the gas grid, farmers should reconsider their digesting policy from electricity into upgraded clean gas.

Existing RNG systems are too expensive for gas capacities under 1000 Nm3/h. Another approach of the Sulaway? process makes cleaning of small biogas capacities possible.