The document shows the results of a biogas yield test conducted over 7 days. It recorded the total biogas produced each day from the degradation of a 2002 ml substrate added to a 2L sludge sample. The percentage of total biogas produced decreased each day from 44% on day 1 to 4% on day 7. Additional analysis found that COD and sCOD levels increased from the start to end of the test and VFA levels decreased, indicating biogas production from the substrate.

1. Substrate ↓
Day Total Biogas % of Total Biogas
Day 0 0 ml 0%
Day 1 920 ml 44%
Day 2 1280 ml 17%
Day 3 1600 ml 15%
Day 4 1820 ml 10%
Day 5 1940 ml 6%
Day 7 2100 ml 4%
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2002 ml Column1 Substrate Sludge
Amount added to
2L of sludge (ml)
Calculated
Total
Actual Total Analysis Start End Dif %
2100 ml COD: 22,300 ppm 31,200 ppm 243 ml 33,909 ppm 32,110 ppm COD 32,110 ppm 28,000 ppm 12.8%
105 % sCOD: 11,200 ppm 1,400 ppm 243 ml 2,761 ppm 2,542 ppm sCOD 2,542 ppm 1,200 ppm 52.8%
8 Days VFA's 300 ppm 123 ppm 59.0%
pH 6.96 7.14
Days test ran for:
Actual Gas Produced:
Estimated Gas Production:
Food Waste
Percent Produced:
44% 17% 15% 10% 6% 4%0%0%0%0%0%0%0%0%0%0%0 ml
920 ml
1280 ml
1600 ml
1820 ml
1940 ml
2100 ml
0 ml
500 ml
1000 ml
1500 ml
2000 ml
2500 ml
Day 0 Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7
Biogas Yield Test
% of Total Biogas Total Biogas Estimated Biogas