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Table 1

Properties of the final compost products from in-vessel septage co-composting at trial 1, 2 and 3

ParametersStandard valuesaTrial 1Trial 2Trial 3
Ammoniacal-N (mg/kg dw) ≤700 190.4 ± 4.8 148.4 ± 5.3 147.8 ± 5.3 
C/N ratio ≤25 10.2 ± 0.5 15.3 ± 0.2 17.2 ± 0.8 
pH value 5.5–8.5 7.8 ± 0.10 7.2 ± 0.02 7.7 ± 0.02 
Seed germination index (%) ≥80 149 137 118 
Total N, P, K ≥4% dw 4.1 ± 0.5 4.74 5.7 ± 0.5 
ParametersStandard valuesaTrial 1Trial 2Trial 3
Ammoniacal-N (mg/kg dw) ≤700 190.4 ± 4.8 148.4 ± 5.3 147.8 ± 5.3 
C/N ratio ≤25 10.2 ± 0.5 15.3 ± 0.2 17.2 ± 0.8 
pH value 5.5–8.5 7.8 ± 0.10 7.2 ± 0.02 7.7 ± 0.02 
Seed germination index (%) ≥80 149 137 118 
Total N, P, K ≥4% dw 4.1 ± 0.5 4.74 5.7 ± 0.5 

aCompost and soil conditioner quality standards for general agricultural use (HKORC 2005).

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