Biogas production via the anaerobic digestion of Jew's mallow processing
wastes (JMPW) and cattle dung (CD) was studied. Obtain results showed
that the populations of anaerobic saccharolytic, proteolytic, cellulose
decomposers and acid producing bacteria were higher in digested slurry of
JMPW than cattle dung. Colonies of total coliform bacteria were not detected
at the 35th day. Fecal coliform bacteria were not detected at the 28th and 35rh
day for JMPW and CD, respectively. Counts of Salmonella and ,Sftlgellc were
rapidly decreased throughout the anaerobic digestion period to be completely
undetected at the 14th and 28th day for JMPW and CD, respectively. Digested
slurry of JMPW exhibited higher records of volatile fatty acids compared to
the digested slurry of CD. Accumulation of ammonia during anaerobic
fermentation of either JMPW or CD (1273 aad 275 ppm, respectively) didn't
reach the level reported to be toxic or even inhibitive to methanogenic
bacteria. Cumulative biogas was higher in case of JMPW than CD. While,
methane percentage in produced biogas was higher in case of CD than
JMPW. Biogas production rates per kg volatile solids either added or
consumed were (215.33, 826,47 and 160.79, 797.79) for JMPW and CD,
respectively. While, methane production rates per kg volatile solids either
added or consumed were (123.84, 475.31 and 98.74, 489.88) for,JMPW and
CD, respectively.
|
