| 摘要 |
<p>A method and apparatus for separating a compressed, biologically generated, feed gas stream comprising methane, carbon dioxide, water vapour and impurities including volatile non-methane organic compounds. The method comprises purifying the compressed, biologically generated, feed stream by adsorption to remove the volatile non-methane organic compounds and the water vapour and to form a purified feed stream. The purified feed stream is separated by membranes to produce a first product gas stream enriched in methane and an intermediate gas stream enriched in carbon dioxide. Part of the first product gas stream is withdrawn and mixed with at least part of the intermediate gas stream to form a second product gas steam comprising methane and carbon dioxide.</p> |
