Electronic Journal of Biotechnology ISSN: 0717-3458
  © 2008 by Universidad Católica de Valparaíso -- Chile
Vol. 11 No. 4, Issue of October 15, 2008
 

Table 1. Sludge characterisation, and expected amount of methane gas from the digestion of sludge.


Type of sludge

1º hydrol

2º hydrol

mixed

mixed hydrol

 g COD/g VS

1,8

1,8

1,4

1,4

1,6

1,6

 % SV/ST

70%

70%

67%

67%

68%

68%

 % VS degradation

50%

60%

40%

64%

44%

62%

 L CH4/kg VSfeed

315

378

196

314

240

341

1º: primary sludge.
1º hydrol.: primary sludge after thermal hydrolysis.
2º: secondary sludge.
2º hydrol.: secondary sludge after thermal hydrolysis.
mixed: mixed sludge (40% VS from primary, 60% VS from secondary).
mixed hydrol.: secondary sludge after thermal hydrolysis.


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