DIGESTER CHEMISTRY
Examples of Digester Chemistry
Examples of routinely requested chemical analyses of feedstocks and digestates are provided below. See RESOURCES for a full list of Analytical Tests we provide.
Feedstock Characterization
These tests are typically requested to evaluate the suitability of biosolids as non-contaminated feedstocks with sufficient biogas-generating potential to add value to the process.
| Parameter | Description |
|---|---|
| TS/VS | Total Solids / Volatile Solids |
| pH | Acidity |
| BOD | Biological Oxygen Demand |
| COD | COD |
| TAN | Total Ammonia Nitrogen |
| TN | Total Nitrogen |
| C:N | Carbon to Nitrogen Ratio |
| S | Total Sulphur |
| PROX | Protein, Fat, Ash, & Carbs |
| Metals | Metal scan (28 elements) |
Anaerobic Digestate Analysis
These types of tests are typically used to evaluate the suitability of digestate for fertilizer use.
| Parameter | Description |
|---|---|
| TS/VS | Total Solids / Volatile Solids |
| VFA | Volatile Fatty Acids |
| VFA/Alk | pH Balance |
| Alk | Alkalinity |
| TAN | Total Ammonia Nitrogen |
| NPK | Fertilizer Value |
| S | Total Sulphur |
| TSS | Total Suspended Solids |
| TDS | Total Dissolved Solids |
| Metals | Metal scan (28 elements) |
| BOD | Biochemical Oxygen Demand |
| COD | Chemical Oxygen Demand |
| Path | E. coli & Salmonella |