SBR工艺用于焦化纳滤浓盐水生物脱氮  

Biological denitrification for nanofiltration concentrate from coking wastewater by SBR process

作　　者：李恩超[1,2] 王治立[1] 金学文[2] 吕树光[1] 侯红娟[2] 尹婷婷[2] 

机构地区：[1]华东理工大学国家环境保护化工过程环境风险评价与控制重点实验室,上海200237 [2]宝山钢铁股份有限公司,上海201900

出　　处：《环境工程学报》2015年第8期3854-3858,共5页Chinese Journal of Environmental Engineering

摘　　要：以焦化废水超滤/纳滤/反渗透的“三膜法”深度处理工艺产生的高电导率纳滤（NF）浓盐水为研究对象,采用SBR脱氮工艺对NF浓盐水中有机污染物和总氮（TN）的去除性能进行了研究.实验结果表明,SBR脱氮工况为进水5min,缺氧搅拌8h,好氧曝气12 h,静置2h,出水5 min,闲置1 h 50 min,污泥浓度（MLSS）为3 000 mg/L左右时,TN平均去除率为45.45％,COD平均去除率为45.36％.通过烧杯实验研究了不同C/N比对反硝化脱氮效率的影响及其中氮形态的变化,在C/N为421时,出水TN可降低至14.8 mg/L,其中NO3--N为5.0 mg/L.研究结果证明,SBR可将电导率为12 000～ 16 000 μS/cm的焦化纳滤浓盐水TN降低至15 mg/L以下.Organic pollutants and total nitrogen （TN） removal performances in NF concentrate with high conductivity from coking wastewater generated through ultrafiltration/nanofiltration/reverse osmosis processes by SBR denitrification were investigated in this study. The results showed that the average removal effieieneies of TN and COD were 45.45% and 45.36% , respectively, under the operational conditions, namely, 5 rain of inflow, 8 h of anoxic treatment, 12 h of aerobic treatment, 2 h of sedimentation, 5 min of outflow, 1 h and 50 min of i- dle, and MLSS concentration around 3 000 mg/L. The batch tests were employed in investigation of the effects of various C/N ratios on denitrification efficiency and transformation of nitrogen form, and the results showed TN and NO3- -N in effluent could be lowered to 14.8 mg/L and 5.0 mg/L, respectively, when C/N was set at 4/1. This study finally confirmed that less than 15 mg/L of TN could be achieved after treatment for NF concentrate whose conductivity was around 12 000 - 16 000 μS/cm by SBR process.

关 键 词：焦化废水 纳滤浓水 SBR 生物脱氮 

分 类 号：X703[环境科学与工程—环境工程]