Abstract
Hydrolysis, acidification and dewaterability of waste activated sludge (WAS) were investigated at pH 10 controlled by the addition of NaOH, Ca(OH)2 or their mixtures at various ratios. Similar efficiency of WAS solublisation was observed in all cases, at 38-40%. High volatile fatty acid (VFA) production and good sludge dewaterability could not be achieved simultaneously by adding NaOH or Ca(OH)2 alone, but could be achieved by adding mixtures of NaOH and Ca(OH)2. VFA production in the case with the addition of Ca(OH)2 only (1201mg(COD)/L) was lower than in the cases with the addition of NaOH or its mixtures with Ca(OH)2 (1813-1868mg(COD)/L), and the lower VFA production with Ca(OH)2 addition alone could be related to the fact that a higher concentration of Ca2+ was released into the fermentation liquid, which likely inhibited the hydrolysis process of protein. Furthermore, adding mixtures of NaOH and Ca(OH)2 was more economical for VFA production. © 2013 Elsevier Ltd.
| Original language | English |
|---|---|
| Pages (from-to) | 237-243 |
| Journal | Bioresource Technology |
| Volume | 136 |
| DOIs | |
| Publication status | Published - May 2013 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- Dewaterability
- Mixed alkaline condition
- Volatile fatty acid
- Waste activated sludge
