Treatment of Aniline-Contaminated Wastewater by Sequencing Biofilm Batch Reactor System Under Micro-Aerobic Condition

doi:10.1007/s12204-015-1670-3

Abstract

Abstract: Sequencing biofilm batch reactor (SBBR) under micro-aerobic condition was applied to the treatment of aniline-contaminated wastewater in this study. Hydraulic retention time (HRT) of 12—36 h and dissolved oxygen (DO) concentration of 0.1—0.5 mg/L were selected as the operating variables to model, analyze and optimize the process. Five dependent parameters, aniline (AN), chemical oxygen demand (COD), ammonium, total nitrogen (TN) and total phosphorus (TP) removal efficiencies as the process responses, were studied. From the results, increase in DO concentration could promote the AN, COD and ammonium removal; increase in HRT could also lead to increase of the AN and ammonium removal, but might decrease COD removal due to endogenous respiration and soluble microbial products. In the SBBR system, 24 h for HRT and 0.5 mg/L for DO concentration were chosen as the optimum operating condition. The actual removal efficiencies of COD, AN and ammonium under the optimum operating condition were 98.37%, 100% and 89.29%, respectively. The experimental findings were in close agreement with the model prediction. The presence of glucose could promote bacterial growth and has positive influence on AN degradation and ammonium removal.

Key words: aniline-contaminated wastewater| hydraulic retention time (HRT)| dissolved oxygen (DO)| microaerobic condition

摘要： Sequencing biofilm batch reactor (SBBR) under micro-aerobic condition was applied to the treatment of aniline-contaminated wastewater in this study. Hydraulic retention time (HRT) of 12—36 h and dissolved oxygen (DO) concentration of 0.1—0.5 mg/L were selected as the operating variables to model, analyze and optimize the process. Five dependent parameters, aniline (AN), chemical oxygen demand (COD), ammonium, total nitrogen (TN) and total phosphorus (TP) removal efficiencies as the process responses, were studied. From the results, increase in DO concentration could promote the AN, COD and ammonium removal; increase in HRT could also lead to increase of the AN and ammonium removal, but might decrease COD removal due to endogenous respiration and soluble microbial products. In the SBBR system, 24 h for HRT and 0.5 mg/L for DO concentration were chosen as the optimum operating condition. The actual removal efficiencies of COD, AN and ammonium under the optimum operating condition were 98.37%, 100% and 89.29%, respectively. The experimental findings were in close agreement with the model prediction. The presence of glucose could promote bacterial growth and has positive influence on AN degradation and ammonium removal.

关键词: aniline-contaminated wastewater| hydraulic retention time (HRT)| dissolved oxygen (DO)| microaerobic condition

CLC Number:

X 703.1

QI Pei-shi* (祁佩时), CHEN Hong-yi (陈洪一), LIU Yun-zhi (刘云芝). Treatment of Aniline-Contaminated Wastewater by Sequencing Biofilm Batch Reactor System Under Micro-Aerobic Condition[J]. Journal of shanghai Jiaotong University (Science), 2015, 20(5): 634-640.

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