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In search for both new renewable energy and an effective way to reduce emission of greenhouse gases from farming, anaerobic digestion that produces methane is now considered the most efficient process. The main challenge in implementing this process in typical smallto medium-scale farming is the relatively large investments necessary compared to the economic benefits achieved. Transport of manure through pipes, tanks, reactors and settling tanks all add up to a cost higher than the economic benefits for the farm. A way of reducing these costs by simplifying the process is analysed here. Drainage of liquids from existing storage facilities both reduces the necessary amount of construction and of the reactor volume for biogas production. The drained substrate liquid from the storage is fed a high efficiency biogas reactor. The reactor outlet is returned to the manure storage tank. The test necessary to quantify the achievable amounts of drained liquid was done using a 3.4 m 3 vessel, containing slightly diluted cow manure (14% diluted). A 1.4 m long common corrugated drainpipe (80/100 mm) was used for drainage. This was wrapped in common mosquito net in order to avoid clogging and increase the area of filtration. For observation of scaling effects, a small lab scale feeder, (I: 1000 regarding the vessel, the scaling of the filter area is I: 17.5) with a subsequent reactor was used in addition. In both cases peristaltic pumps were used to assure the necessary flow accuracy and provide a vacuum suction of 0.1 bar. Maximum flux of drained liquid achieved though the drainpipe was 341 L/m 2 .d in the pilot vessel and 48 L/m .d in lab scale, implying that the proposed biogas process based on liquid feed extraction from manure is feasible.

Liquid extraction of substrate from manure for efficient biogas production