title: Waste activated sludge hydrolysis and acidification: A comparison between sodium hydroxide and steel slag addition.
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.
authors.affiliation: 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.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: 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.
authors.forename: Chaojie
authors.initials: C
authors.lastname: Zhang
authors.affiliation: East China Electric Power Design Institute Co. Ltd. of China Power Engineering Consulting Group, Shanghai 200063, China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Leiyu
authors.initials: L
authors.lastname: Feng
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Yongmei
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhou
mesh_terms: D005232:Fatty Acids, Volatile / Q000737:chemistry; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D010758:Phosphorus; D012037:Refuse Disposal / Q000379:methods*; D012972:Sodium Hydroxide / Q000737:chemistry; D013232:Steel; D014866:Waste Products / Q000032:analysis*
chemical_list: D005232:Fatty Acids, Volatile; D014866:Waste Products; D013232:Steel; D010758:Phosphorus; D012972:Sodium Hydroxide
keywords: Alkaline treatment; Sodium hydroxide; Steel slag; Waste activated sludge