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

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 a...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2016-10, Vol.48 (10), p.200-208
Main Authors: Zhang, Ying, Zhang, Chaojie, Zhang, Xuan, Feng, Leiyu, Li, Yongmei, Zhou, Qi
Format: Article
Language:English
Subjects:
Alkaline treatment
Fatty Acids, Volatile - chemistry
Fermentation
Hydrogen-Ion Concentration
Hydrolysis
Phosphorus
Refuse Disposal - methods
Sodium hydroxide
Sodium Hydroxide - chemistry
Steel
Steel slag
Waste activated sludge
Waste Products - analysis
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Summary: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 pH 10 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 supematant 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.
ISSN:1001-0742
1878-7320
DOI:10.1016/j.jes.2016.02.010