[Effects of different co-substrates on degradation of nitrophenols using upflow anaerobic sludge bed (UASB) reactors].
The removal efficiencies of 3-nitrophenol (3-NP) and 2, 6-dinitrophnol (2, 6-DNP) were investigated in two lab-scale upflow anaerobic sludge bed (UASB) reactors using two different co-substrates. Initially, glucose was used as co-substrate and followed by sodium acetate. The results showed that glucose was found to be a better co-substrate for 3-NP degradation compared to sodium acetate. While for the degradation of 2,6-dinitrophenol, sodium acetate was better. For the study of 3-NP degradation, input COD concentration was kept as 2,500 mg/L and hydraulic retention time (HRT) was kept as 26 h with glucose as co-substrate. Maximum 3-NP concentration was 254.6 mg/L and 3-NP removal efficiencies were always more than 99.0%. While HRT was 30 h with sodium acetate as co-substrate, maximum 3-NP concentration was 71.6 mg/L and over 90.0% 3-NP removal efficiencies could be obtained. For the study of 2,6-DNP degradation, HRT was 35 h using the same input COD concentration as 3-NP degradation. The maximum 2,6-DNP concentration was 170.0 mg/L and 2,6-DNP removal efficiencies were always more than 98.0% using glucose as co-substrate. While HRT was 30 h with sodium acetate as co-substrate, maximum 2,6-DNP concentration was 189.5 mg/L and over 99.2% 2,6-DNP removal efficiencies could be obtained.
Jiang
Li-na
LN
Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China. jianglina2000er@163.com
She
Zong-lian
ZL
Jin
Chun-ji
CJ
Wang
Lei
L
Yu
Jing
J
D019149:Bioreactors; D002244:Carbon / Q000737:chemistry; D011232:Chemical Precipitation; D005947:Glucose / Q000737:chemistry; D009596:Nitrophenols / Q000737:chemistry* / Q000378:metabolism; D012722:Sewage / Q000737:chemistry*; D019346:Sodium Acetate / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*
D009596:Nitrophenols; D012722:Sewage; D019346:Sodium Acetate; D002244:Carbon; C053026:2,6-dinitrophenol; D005947:Glucose; C049017:3-nitrophenol