Abstract:
Performance of three seeding sludge under three different
hyper-thermophilic temperatures, 60°C, 65°C and 70°C was investigated and
compared with mesophilic (37°C) and thermophilic (55°C) temperatures using
the same seeding sludge and substrate in batch tests. Based on German
guidelines for batch tests, the seeding sludge were selected for the batch tests
using eudiometer tubes. Daily volumes of methane production for the three
sludge was measured. Methane yields and degrees of COD degradation of the
black water was also calculated and compared. Cow manure at 65°C recorded
the highest net normalized cumulative volume of methane content
(387.2 mlNCH4-%), methane yield (231.7 mlNCH4/gVS) and degree of COD
degradation (79.1%) while BTU at 70°C recorded the least performance of methane yield (0.0 mlNCH4/gVS) and content (0.0 mlNCH4-%) and degree of
COD degradation (0.0%). Cow manure at 65°C should be considered when
setting-up large-scale hyper-thermophilic digesters
