Table 3 Physical and chemical parameter measurement of composting parameters and their corresponding standard methods
Parameter | Frequency | Method | References |
|---|---|---|---|
Moisture content (MC) | Each 5 days | Using electronic oven by drying at 105 °C for 24 h | NF ISO 11465 (1994) |
Conductivity (EC) | Each 5Â days | 1:10 w/v sample: water extract | NF ISO 11265 (1995) |
pH | Each 5Â days | ISO 10390 (1994) | |
Total organic carbon (TOC) | Each 5 days | TOC (%) = ((100 − Ash %) ÷ 1/8) | (Wang et al. 2018) |
Total nitrogen (TN) | Each 5Â days | Titrimetric methods | NF ISO 11265 (1995) |
C:N ratio | Each 5Â days | Expressed as ratio of (TOC/TKN) % | Wang et al. (2018) |
NH4+ | Each five days | 1:5 w/v sample: water extract | NF ISO 11048 |
NO3− | Each 5 days | Ion chromatography | NF EN 10304-1 |
Nitrification index | Each 5 days | Expressed as ratio of (NH4+:NO3−) | Chaher et al. (2020a) |
Total P and K | Start and end | Atomic absorption spectrometric methods | ISO 11885 (2007) |
Respiration activity (AT4) | At the end | CO2 consumption by NaOH (1Â N) | DIN ISO 16072 |
Heavy metals | At the end | Inductively coupled plasma-mass spectrometer, thermo-elemental ICP-MS-X series | ISO 11885 (2007) |