Converting Onion Waste into Energy as a Co-digestant with Dairy Waste

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Lab scale anaerobic digesters constructed from PVC pipe used to evaluate co-digestion of manure with onion waste

Ninety liter (90 L) anaerobic digesters (anaerobic filters) were constructed from PVC pipe.  The digesters were filled with lava rock.  A thermocouple is placed in the center of each digester to be used in controlling temperature.  Each digester is controlled by a datalogger by reading temperature and turning on or off pumps to circulate water around digester maintaining temperature at 35 oC.