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. 2017 Oct 4;12(10):e0185738. doi: 10.1371/journal.pone.0185738

Fig 1. Images of the six plug-flow field-scale (FS) digesters used in this study.

Fig 1

A, Digester bag prior to installation. The biogas vent tube (10 cm diameter) is not shown but is located in the top center of the bag. B, Field site overview, with the digester bags placed inside insulated HDPE corrugated drainage pipes.