Authors: Çağrı Akyol Burak Demirel Turgut T Onay
Publish Date: 2014/09/04
Volume: 17, Issue: 4, Pages: 808-815
Abstract
Anaerobic batch experiments were conducted at mesophilic temperatures to investigate the possibility of biogas recovery from tannery sludge originating from a tannery wastewater treatment process According to preliminary findings the highest biogas yield was obtained as 0172 L biogas/g VSadded within an inoculum to substrate IS ratio of 110 and at solids content of 106 The highest methane yield of 0089 L CH4/g VSadded was achieved within an IS ratio of 12 during the experiments Relatively lower biogas and methane yields could be attributed to the low organic content of raw sludge cake Potential inhibitors of anaerobic digestion such as heavy metals particularly chromium chloride and sulfate available in raw sludge cake did not seem to influence the process adversely Despite lower methane yields it seemed possible to employ anaerobic digestion process for stabilization and energy recovery from tannery sludge since the biogas obtained could further be used in the wastewater treatment plant as a source of energy Codigestion of tannery sludge with another type of substrate available eg tannery solid wastes can be an alternative to achieve higher biogas and methane yields considerably
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