3.4 Evaluation on Utilisability of Compost Products
93
Table 3.10 Analysis of biofilter removal rate
Gas
Initial
concentration
(mg/m 3 )
Outgassing
concentration
(mg/m 3 )
Outgassing rate
(kg/h)
Removal rate
(%)
NH 3
0.042
0.026
1.26 × 10 –5
38.10
H 2 S
0.0158
0.012
8.85 × 10 –5
24.05
CS 2
0.727
0.2804
3.53 × 10 –4
61.43
Styrene
0.3178
0
–
100
Methyl
mercaptan
0.00906
0.0075
0.00906
17.22
Methyl sulfide
0.01546
0
–
100%
Note Dimethyl disulfide and trimethylamine were not detected during mechanical separation and
biological pre-treatment, Therefore, the odorous gas removed by using the biofilter did not include
dimethyl disulfide and trimethylamine
than 10%. After the composting lasted for 13 days, the GI of the inoculated group
was up to 111% while that of alkalified group was about 40%. It can be seen that the
inoculated group satisfied the harmless standard after being composted for 5 days and
mature after being composted for 8 days. The aforementioned result indicated that
inoculating acidification-resistant complex microbial inoculants can greatly speed
up the humification process, improve the composting efficiency of kitchen wastes
and shorten the composting period to 8 days (Fig. 3.14).
Fig. 3.14 Changes of
germination index during
different composting
93
Table 3.10 Analysis of biofilter removal rate
Gas
Initial
concentration
(mg/m 3 )
Outgassing
concentration
(mg/m 3 )
Outgassing rate
(kg/h)
Removal rate
(%)
NH 3
0.042
0.026
1.26 × 10 –5
38.10
H 2 S
0.0158
0.012
8.85 × 10 –5
24.05
CS 2
0.727
0.2804
3.53 × 10 –4
61.43
Styrene
0.3178
0
–
100
Methyl
mercaptan
0.00906
0.0075
0.00906
17.22
Methyl sulfide
0.01546
0
–
100%
Note Dimethyl disulfide and trimethylamine were not detected during mechanical separation and
biological pre-treatment, Therefore, the odorous gas removed by using the biofilter did not include
dimethyl disulfide and trimethylamine
than 10%. After the composting lasted for 13 days, the GI of the inoculated group
was up to 111% while that of alkalified group was about 40%. It can be seen that the
inoculated group satisfied the harmless standard after being composted for 5 days and
mature after being composted for 8 days. The aforementioned result indicated that
inoculating acidification-resistant complex microbial inoculants can greatly speed
up the humification process, improve the composting efficiency of kitchen wastes
and shorten the composting period to 8 days (Fig. 3.14).
Fig. 3.14 Changes of
germination index during
different composting