Fe~Ⅱ（EDTA）络合协同RDB去除NO废气效能及过程分析  

Investigation of Effect and Process of Nitric Oxide Removal in Rotating Drum Biofilter Coupled with Absorption by Fe~Ⅱ（EDTA）

作　　者：陈浚[1] 杨宣[1] 於建明[1] 蒋轶锋[1] 陈建孟[1] 

机构地区：[1]浙江工业大学生物与环境工程学院,杭州310032

出　　处：《环境科学》2012年第2期539-544,共6页Environmental Science

基　　金：浙江省工业锅炉炉窑烟气污染控制工程技术中心研究中心开放基金项目(2011B01);国家自然科学基金项目(51008280);浙江省环保科研计划项目(2010A10)

摘　　要：为进一步提高一氧化氮(NO)的去除效率,在新型生物转鼓反应器(rotating drum biofilter,RDB)中,以FeⅡ(EDTA)络合协同RDB生物转鼓的耦合技术强化难水溶性NO的气液传质速率,提高生物还原效能为目标进行了研究.结果表明,适量FeⅡ(EDTA)被添加到RDB底部营养液后,能迅速吸收气相中的NO并生成FeⅡ(EDTA)-NO络合物,进而可通过反硝化实现同步脱氮和络合剂再生.在转速0.5 r.min-1、空床停留时间(EBRT)57.7 s、温度30℃、pH 7～8的实验条件下,RDB的净化效能随络合剂的投加而显著改善;FeⅡ(EDTA)质量浓度从0增至500 mg.L-1后,NO去除率从61.1%提高到97.6%,去除负荷从16.2 g.(m3.h)-1上升到26.7 g.(m3.h)-1.分析了FeⅡ(EDTA)络合协同净化NO的反应过程,建立了NO净化效率与FeⅡ(EDTA)添加浓度的关联方程,可较好地拟合实验数据.In order to accelerate the NO removal efficiency,a novel and effective system was developed for the complete treatment of NO from flue gases.The system features NO absorption by FeⅡ（EDTA） and biological denitrification in a rotating drum biofilter（RDB） so as to promote biological reduction.The experimental results show that a moderate amount of FeⅡ（EDTA） was added to the nutrient solution to improve the mass transfer efficiency of NO from gas to liquid,with the concomitant formation of nitrosyl complex FeⅡ（EDTA）-NO.Under the experimental conditions of rotational speed was at 0.5 r·min-1,EBRT of 57.7 s,temperature was at 30℃,pH was 7-8,with the increasing concentration of FeⅡ（EDTA） was from 0 mg·L-1 to 500 mg·L-1,the NO removal efficiency was improved from 61.1% to 97.6%,and the elimination capacity was from 16.2 g·（m3·h）-1 to 26.7 g·（m3·h）-1.In order to simulate the denitrifying process of waste gas containing NO by using RDB coupled with FeⅡ（EDTA） absorption,a tie-in equation of NO removal and the FeⅡ（EDTA） concentration added in RDB was established.The experimental NO removal efficiency change tendency agrees fairly with that predicted by the proposed equation.

关 键 词：生物转鼓过滤器(RDB) FeⅡ(EDTA) 一氧化氮(NO) 络合协同 过程分析 

分 类 号：X701.7[环境科学与工程—环境工程]