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Degree of biodegradation and percentage variation between the samples_
| Serial No. | Sample identity | Experimental day | Rep-1 | Rep-2 | Rep-3 | Mean | Variance in % biodegradation | ||
|---|---|---|---|---|---|---|---|---|---|
| 1 | CTEC filter | 37 | 95.6 | 90.7 | 99.7 | 95.3 | 0.28 | −4.86 | 4.58 |
| 2 | Bidi butt | 54 | 91.6 | 90.9 | 93.7 | 92.1 | −0.51 | −1.27 | 1.77 |
| 3 | IP filter | 55 | 98.3 | 90.3 | 91.5 | 93.4 | 5.28 | −3.28 | −2.00 |
| 4 | CMF filter | 86 | 99.7 | 98.8 | 90.3 | 96.2 | 3.57 | 2.63 | −6.20 |
| 5 | DE-TowTM filter | 97 | 95.0 | 90.1 | 90.5 | 91.9 | 3.41 | −1.92 | −1.49 |
| 6 | CA filter | 151 | 90.1 | 92.2 | 94.1 | 92.1 | −2.21 | 0.07 | 2.13 |
Result of compost analysis_
| Serial No. | Parameters | Result | Specification as per ISO 14855-1 | Analytical Method |
|---|---|---|---|---|
| 1 | Total dry solids (%) | 52.0 | 50 – 55 | ISO 14855-1 |
| 2 | pH of compost | 8.77 | 7 – 9 | ISO 14855-1 |
| 3 | Total volatile solids of compost (%) | 29.7 | # 30 | ISO 14855-1 |
| 4 | Organic carbon (%) | 10.8 | – | In-house validated method using CHNS* analyzer |
| 5 | Total nitrogen (%) | 2.04 | – | In-house validated method using Kjeldahl apparatus (KjelMaster K 375) |
| 6 | C/N Ratio | 5.29 | – | ISO 14855-1 |
| 7 | Total Plate Count, cfu/g (TPC) | 8.5 × 105 | – | IS 5402 |
| 8 | Yeast and Mould, cfu/g (YMC) | 2.0 × 104 | – | IS 5403:1999 (Reaffirmed 2018) |
Validity of the test_
| Parameters | Result | Specification |
|---|---|---|
| Degree of biodegradation of reference materials | 70% in 38 days | 70% in 45 days |
| CO2 per g of volatile solids after 10 days (mg/g) | 97.0 mg/g of volatile solids | 50–150 mg of CO2/g of volatile solids after 10 days of incubation |
| Difference between % biodegradation of the reference material | 2.24 – 6.35% | Less than 20% |