硝化液循环比对DBF-BAF工艺处理焦化废水效能的影响  

Influence of cycle ratio of nitration liquid on efficiency of DBF-BAF process in treating coking wastewater

作　　者：郑俊[1,2,3] 贺倩倩[1] 张德伟 张海涛[1] 鲍荟荟 

机构地区：[1]安徽工业大学能源与环境学院,马鞍山243032 [2]安徽华骐环保科技股份公司,马鞍山243061 [3]安徽省BAF工程技术研究中心,马鞍山243061

出　　处：《环境工程学报》2017年第1期317-321,共5页Chinese Journal of Environmental Engineering

基　　金：安徽省科技攻关计划项目(1301041023)

摘　　要：采用DBF-BAF工艺处理焦化废水,考察不同硝化液循环比条件下系统的脱氮除碳效果,通过分析循环比对各反应器内的氮赋存反应、COD去除特性的影响,探究其对DBF-BAF工艺处理焦化废水时脱氮除碳效能的影响机制。结果表明:适当增大循环比,有利于系统脱氮除碳,在300%的最佳循环比下,系统对COD、NH_4^+-N、有机氮和TN的平均去除率分别为87.57%、97.34%、99.18%和79.97%,出水NH_4^+-N稳定达到5.00 mg·L^(-1)以下;循环比通过改变各反应器进水COD、NO_3^--N、NH_4^+-N、有机氮和DO浓度来影响其内的碳氧化反应和氮素的转化与去除,进而影响系统的脱氮除碳效能。A DBF-BAF process was adopted for treating coking wastewater. The removal of carbon and nitrogen from the system at different cycle ratios of nitration liquid was investigated,and the influential mechanism of the cycle ratio on the removal efficiencies of the system in treating coking wastewater was explored by analyzing its influences on nitrogen occurrence and COD removal characteristics in each reactor. The results showed that the appropriate increase of cycle ratio was beneficial to the system for the removal of nitrogen and carbon. At the optimal cycle ratio of 300%,the average removal rates of COD,NH_4~＋-N,organic nitrogen,and TN were 87. 57%,97. 34%,99. 18%,and 79. 97%,respectively,and the concentration of NH_4~＋-N at the outlet was less than5. 00 mg·L- 1. The cycle ratio affected carbon oxidation and the transformation and removal of nitrogen in each reactor by changing the inlet concentrations of COD,NO3-N,NH_4~＋-N,organic nitrogen,and DO,which in turn affected the removal efficiencies of the system.

关 键 词：焦化废水 DBF-BAF 硝化液循环比 氮赋存 

分 类 号：X703.1[环境科学与工程—环境工程]