Review Article
Current Status and Future Prospects of Small-Scale Household Biodigesters in Sub-Saharan Africa
Table 7
Feedstock and process parameters affecting digestate composition [
80].
| Feedstock parameter | Digestate composition impact | Process conditions | Digestate composition impact |
| Organic wastes | (i) Low organic content concentration in TS (ii) Low content of total solids | High amount of fresh water | (i) High production of digestate (ii) Low levels of salt and ammonia (iii) Low TS content |
| Large amount of abattoir waste | (i) High concentration of nitrogen (ii) High % of NH3 in total nitrogen | Recirculating liquid in large quantities (process water made from the liquid portion of digestate) | (i) Low production of digestate (ii) Excessive salt/ammonia concentrations (iii) A higher content of TS |
| High quantity of manure | (i) Low content of TS high nitrogen concentration | Short hydraulic retention time | (i) High quantity of volatile fatty acids (ii) Organic content in TS (iii) Low NH3 content in total nitrogen |
| Energy crops | (ii) High content of TS (iii) High % of organics in TS (VS/TS ratio) | | |
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