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J Environ Sci (China). 2016 Oct;48:200-208. doi: 10.1016/j.jes.2016.02.010. Epub 2016 Mar 22.

Waste activated sludge hydrolysis and acidification: A comparison between sodium hydroxide and steel slag addition.

Author information

1
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, NSW 2522, Australia.
2
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: myrazh@tongji.edu.cn.
3
East China Electric Power Design Institute Co. Ltd. of China Power Engineering Consulting Group, Shanghai 200063, China.
4
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.

Abstract

Alkaline treatment with steel slag and NaOH addition were investigated under different pH conditions for the fermentation of waste activated sludge. Better performance was achieved in steel slag addition scenarios for both sludge hydrolysis and acidification. More solubilization of organic matters and much production of higher VFA (volatile fatty acid) in a shorter time can be achieved at pH10 when adjusted by steel slag. Higher enzyme activities were also observed in steel slag addition scenarios under the same pH conditions. Phosphorus concentration in the supernatant increased with fermentation time and pH in NaOH addition scenarios, while in contrast most phosphorus was released and captured by steel slag simultaneously in steel slag addition scenarios. These results suggest that steel slag can be used as a substitute for NaOH in sludge alkaline treatment.

KEYWORDS:

Alkaline treatment; Sodium hydroxide; Steel slag; Waste activated sludge

PMID:
27745665
DOI:
10.1016/j.jes.2016.02.010
[Indexed for MEDLINE]

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