Abstract
The aim of this work was to study the key parameters affecting fermentation of high rate activated A-sludge to carboxylates, including pH, temperature, inoculum, sludge composition and iron content. The maximum volatile fatty acids production was 141 mg C g1 VSSfed, at pH 7. Subsequently the potential
for carboxylate and methane production for A-sludge from four different plants at pH 7 and 35 C were compared. Initial BOD of the sludge appeared to be key determining carboxylate yield from A-sludge. Whereas methanogenesis could be correlated linearly to the quantity of ferric used for coagulation, fermentation did not show a dependency on iron presence. This difference may enable a strategy
whereby A-stage sludge is separated to achieve fermentation, and iron dosing for phosphate removal is only implemented at the B-stage.
for carboxylate and methane production for A-sludge from four different plants at pH 7 and 35 C were compared. Initial BOD of the sludge appeared to be key determining carboxylate yield from A-sludge. Whereas methanogenesis could be correlated linearly to the quantity of ferric used for coagulation, fermentation did not show a dependency on iron presence. This difference may enable a strategy
whereby A-stage sludge is separated to achieve fermentation, and iron dosing for phosphate removal is only implemented at the B-stage.
| Original language | English |
|---|---|
| Pages (from-to) | 165-172 |
| Number of pages | 8 |
| Journal | Bioresource Technology |
| Volume | 217 |
| Early online date | 21 Mar 2016 |
| DOIs | |
| Publication status | Published - Oct 2016 |
Keywords
- AB process
- Anaerobic digestion
- A-sludge
- Iron
- volatile fatty acids