Authors: Suraju A Lateef Nilmini Beneragama Takaki Yamashiro Masahiro Iwasaki Kazutaka Umetsu
Publish Date: 2013/07/03
Volume: 37, Issue: 3, Pages: 355-363
Abstract
Anaerobic codigestion of cow manure CM and waste milk WM produced by sick cows during treatment with antibiotics was evaluated in twostage process under thermophilic condition 55 °C to determine the effect of WM addition on hydrogen H2 and methane CH4 production potentials volatile solids VS removal and energy recovery Six CM to WM VS ratios of 1000 9010 7030 5050 3070 and 1090 were examined using 1L batch digesters The WM VS ratio of 30 was found to be the minimum limit for significant increases in specific H2 and CH4 yields and VS removal as compared to digestion of manure alone P 005 The highest specific H2 and CH4 yields VS removal and energy yield were 382 mL/g VS 6276 mL/g VS 784 and 254598 kJ/kg VS respectively in CMWM 3070 Lag phases to H2 and CH4 productions were observed in CM–WM mixtures increased with increasing the amount of WM in the feedstock and were greater than 72 h in CMWM 5050 and 3070 The digestion system failed in CMWM 1090 The results suggest that CMWM 3070 was optimum however due to limited amount of WM usually generated and long lag phase at this ratio which may make the process uneconomical CMWM 7030 is recommended in practice
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