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Hydrolysis and acidification of waste activated sludge enhanced by zero valent iron-acid pretreatment: effect of pH
- Source :
- Desalination and Water Treatment. 57:12099-12107
- Publication Year :
- 2015
- Publisher :
- Informa UK Limited, 2015.
-
Abstract
- Zero valent iron (ZVI) is the most commonly applied as a reactive media in remediation of wastewater treatment. In this work, a novel ZVI-acid pretreatment was expected to improve the anaerobic fermentation of waste activated sludge (WAS). The experimental results showed that pH significantly affected the function of ZVI, and the maximum SCOD, soluble protein, and polysaccharides were observed at pH 3.0 in the presence of ZVI. At fermentation time of 4 d, the maximum total volatile fatty acids (VFAs) was 900 mg/L with ZVI dosage of 1 g/g DS, which was 1.53-fold higher than the blank test. The analysis of VFAs composition showed that acetic, propionic, and valeric acids were the three main products at any ZVI dosage, and ZVI dosing contributed to a greater proportion of acetic acid and a lesser proportion of propionic acid. Meanwhile, mechanism investigations showed that the hydrolysis of soluble substrate as well as acidification of hydrolysate was apparently enhanced by ZVI dosing. These results ...
- Subjects :
- Zerovalent iron
Chemistry
0208 environmental biotechnology
Substrate (chemistry)
Ocean Engineering
02 engineering and technology
010501 environmental sciences
01 natural sciences
Pollution
Hydrolysate
020801 environmental engineering
Hydrolysis
Acetic acid
chemistry.chemical_compound
Activated sludge
Biochemistry
Fermentation
Sewage treatment
0105 earth and related environmental sciences
Water Science and Technology
Nuclear chemistry
Subjects
Details
- ISSN :
- 19443986 and 19443994
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Desalination and Water Treatment
- Accession number :
- edsair.doi...........a3d2893bd774ed59fd4ea2704ad5f13c