Phosphorus and short-chain fatty acids recovery from waste activated sludge by anaerobic fermentation: Effect of acid or alkali pretreatment.
Waste activated sludge (WAS) was pretreated by acid or alkali to enhance the anaerobic fermentation (AF) for phosphorus (P) and short-chain fatty acids (SCFAs) release into the liquid simultaneously. With acid pretreatment, the released total P concentration achieved 120mg/L, which was 71.4% higher than that with alkali pretreatment. In addition, alkali pretreatment enhanced organic P release with about 35.3% of organic P in the solid being converted to inorganic P, while little had changed with acid pretreatment. The results also showed that acid and alkali pretreatment enhanced SCFAs production by 15.3 and 12.5times, respectively. Acid pretreatment could be preferred for simultaneous recovery of P and SCFAs by AF.
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
Liang
L
Wu
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
Cheng
C
Zhang
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
Hui
H
Hu
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China. Electronic address: liujianyong@shu.edu.cn.
Jianyong
J
Liu
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
Tengfei
T
Duan
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
Jinghuan
J
Luo
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
Guangren
G
Qian
D000468:Alkalies; D005232:Fatty Acids, Volatile; D005285:Fermentation; D010758:Phosphorus; D012722:Sewage
D000468:Alkalies; D005232:Fatty Acids, Volatile; D012722:Sewage; D010758:Phosphorus
Anaerobic fermentation; Phosphorus release; Pretreatment; SCFAs; WAS