| FeⅡ(EDTA)络合协同RDB去除NO废气效能及过程分析 |
| 摘要点击 2544 全文点击 1288 修订日期：2011-06-21 |
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| 中文关键词 生物转鼓过滤器(RDB) FeⅡ(EDTA) 一氧化氮(NO) 络合协同 过程分析 |
| 英文关键词 rotating drum biofilter (RDB) FeⅡ(EDTA) nitric oxide (NO) couple process analysis |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| 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. |
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