TY - JOUR
T1 - Treatment of 3,4,5-trimethoxybenzaldehyde and Di-bromo-aldehyde manufacturing wastewater by the coupled Fenton pretreatment and UASB reactor with emphasis on optimization and chemicals analysis
AU - Li, Wei Cheng
AU - Chen, Hong
AU - Jin, Yong
AU - Zhang, Hong
AU - Niu, Qigui
AU - Qi, Weikang
AU - Zhang, Yanlong
AU - Li, Yu You
AU - Gao, Yingxin
N1 - Funding Information:
This study was supported by the Japan Society for the Promotion of Science (JSPS 2012-2015) (CAS-11209), National Natural Science Foundation of China (NSFC) (51221892), (51178449) and (U1204611) and State Hi-tech Research and Development Project of the Ministry of Science and Technology, Peoples Republic of China (Grand) (2012AA063401). We wish to thank the anonymous reviews and editors for their valuable suggestions on revising and improving the work.
Publisher Copyright:
©2014 Elsevier B.V. All rights reserved.
PY - 2015/3/4
Y1 - 2015/3/4
N2 - An integrated Fenton-UASB was investigated for the treatment of 3,4,5-trimethoxybenzaldehyde (TMBA) and Di-bromo-aldehyde manufacturing wastewater. A quadratic model for describing the individual and interactive effects of three variables independent variables (pH, concentration of H2O2 and H2O2/Fe2+) affecting COD abatement in Fenton pretreatment was successfully developed by the response surface methodology. The model proposed was further interfaced with the convex optimization method to optimize the variables in that convex optimization method can guarantee global optimization. A substantial increase in the BOD5/COD ratio of the Fenton treated wastewater was observed, allowing sequent biological treatment feasible. The UASB reactor receiving treated effluent was operated continuously with an organic loading rate (OLR) from initial 3.0 g to 24.0 g COD/L/d with a stepwise reduction in hydraulic retention time (HRT) for 160 days. The degradation of organics in Fenton pretreatment and the anaerobic process was further revealed through GC-MS and FT-IR, respectively. The experimental results highlighted that the potential of integrated Fenton-UASB, providing 80.4% COD removal efficiency accompanied with 96.8% and 100% of TMBA and Di-bromo-aldehyde removal efficiency, respectively even when the applied OLR was up to 16.0 g COD/L/d.
AB - An integrated Fenton-UASB was investigated for the treatment of 3,4,5-trimethoxybenzaldehyde (TMBA) and Di-bromo-aldehyde manufacturing wastewater. A quadratic model for describing the individual and interactive effects of three variables independent variables (pH, concentration of H2O2 and H2O2/Fe2+) affecting COD abatement in Fenton pretreatment was successfully developed by the response surface methodology. The model proposed was further interfaced with the convex optimization method to optimize the variables in that convex optimization method can guarantee global optimization. A substantial increase in the BOD5/COD ratio of the Fenton treated wastewater was observed, allowing sequent biological treatment feasible. The UASB reactor receiving treated effluent was operated continuously with an organic loading rate (OLR) from initial 3.0 g to 24.0 g COD/L/d with a stepwise reduction in hydraulic retention time (HRT) for 160 days. The degradation of organics in Fenton pretreatment and the anaerobic process was further revealed through GC-MS and FT-IR, respectively. The experimental results highlighted that the potential of integrated Fenton-UASB, providing 80.4% COD removal efficiency accompanied with 96.8% and 100% of TMBA and Di-bromo-aldehyde removal efficiency, respectively even when the applied OLR was up to 16.0 g COD/L/d.
KW - 3,4,5-Trimethoxybenzaldehyde and Di-bromo-aldehyde
KW - Convex optimization method
KW - Fenton
KW - FT-IR
KW - GC-MS
KW - manufacturing wastewater
KW - UASB
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U2 - 10.1016/j.seppur.2014.12.013
DO - 10.1016/j.seppur.2014.12.013
M3 - Article
AN - SCOPUS:84920740389
SN - 1383-5866
VL - 142
SP - 40
EP - 47
JO - Separation and Purification Technology
JF - Separation and Purification Technology
ER -