Advanced treatment of biologically pretreated coking wastewater byintensified zero-valent iron process (IZVI) combined withanaerobic filter and biological aerated filter (AF/BAF)
来源期刊：中南大学学报(英文版)2015年第10期
论文作者：PAN Lu-ting HAN Yue WU Jin-feng
文章页码：3781 - 3787
Key words：advanced treatment; coking wastewater; intensified zero valent iron; biofilter
Abstract: Experiments were conducted to investigate the behavior of the sequential system of intensified zero-valent iron process (IZVI) and anaerobic filter and biological aerated filter(AF/BAF) reactors for advanced treatment of biologically pretreated coking wastewater. Particular attention was paid to the performance of the integrated system for the removal of chemical oxygen demand (COD), ammonia nitrogen (NH3-N) and total nitrogen (TN). The average removal efficiencies of COD, NH3-N and TN were 76.28%, 96.76% and 59.97%, with the average effluent mass concentrations of 56, 0.53and 18.83mg/L, respectively, reaching the first grade of the national discharge standard. Moreover, the results of gas chromatography/mass spectrum (GC/MS) and gel permeation chromatography (GPC) analysis demonstrated that the refractory organic compounds with high relative molecular mass were partly removed in IZVI process by the function of oxidation-reduction, flocculation and adsorption which could also enhance the biodegradability of the system effluent. The removal efficiencies of NH3-N and TN were achieved mainly in the subsequent AF/BAF reactors by nitrification and denitrification. Overall, the results obtained show that the application of IZVI in combination with AF/BAF is a promising technology for advanced treatment of biologically pretreated coking wastewater.
PAN Lu-ting(潘碌亭)1, HAN Yue(韩悦)1, WU Jin-feng(吴锦峰)2
(1. Modern Agricultural Science and Engineering Institute,Tongji University, Shanghai 200092, China;
2. Transmission and Transformer Engineering Company of Guangdong province, Guangzhou 510160, China)
Abstract:Experiments were conducted to investigate the behavior of the sequential system of intensified zero-valent iron process (IZVI) and anaerobic filter and biological aerated filter(AF/BAF) reactors for advanced treatment of biologically pretreated coking wastewater. Particular attention was paid to the performance of the integrated system for the removal of chemical oxygen demand (COD), ammonia nitrogen (NH3-N) and total nitrogen (TN). The average removal efficiencies of COD, NH3-N and TN were 76.28%, 96.76% and 59.97%, with the average effluent mass concentrations of 56, 0.53and 18.83mg/L, respectively, reaching the first grade of the national discharge standard. Moreover, the results of gas chromatography/mass spectrum (GC/MS) and gel permeation chromatography (GPC) analysis demonstrated that the refractory organic compounds with high relative molecular mass were partly removed in IZVI process by the function of oxidation-reduction, flocculation and adsorption which could also enhance the biodegradability of the system effluent. The removal efficiencies of NH3-N and TN were achieved mainly in the subsequent AF/BAF reactors by nitrification and denitrification. Overall, the results obtained show that the application of IZVI in combination with AF/BAF is a promising technology for advanced treatment of biologically pretreated coking wastewater.
Key words:advanced treatment; coking wastewater; intensified zero valent iron; biofilter
