Abstract
Sludge fermentation liquid (FL) is a promising and sustainable carbon source for biological denitrification. In this study, four types of FLs were prepared using different chemical treatments to enhance denitrification. The profile of effluent organic matter (EfOM) were evaluated. Results indicate that the FLNaOH (NaOH treatment at pH 10) contained the maximum amount of soluble organics, but led to the worst nitrate removal performance. Nitrate removal efficiency with FLcontrol was much higher than that of FLCaO2, FLCa(OH)2, and FLNaOH. On the other hand, it was found some organics in FL was hard to be utilized by denitrifiers. In particular, EfOM with FLNaOH presented the highest building blocks, high molecular weight (HMW) protein and HMW polysaccharide. It also contained much higher C–(C/H) group. This study provided a new insight on the FL driven denitrification. The necessarity of pursuing the alkali pretreatment to produce carbon source were discussed and evaluated.
| Original language | English |
|---|---|
| Article number | 121621 |
| Journal | Bioresource Technology |
| Volume | 289 |
| DOIs | |
| Publication status | Published - Oct 2019 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2019 Elsevier Ltd
ASJC Scopus Subject Areas
- Bioengineering
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal
Keywords
- Alkaline fermentation
- Biological denitrification
- Effluent organic matter (EfOM)
- Fermentation liquid (FL)
- Nitrate reduction
- Nitrite accumulation
