烧结烟气基于生物过滤脱硝所需关键科学技术问题研究

项目名称： 烧结烟气基于生物过滤脱硝所需关键科学技术问题研究

项目编号： No.U1360101

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 黄少斌

作者单位： 华南理工大学

项目金额： 43万元

中文摘要： 钢厂烧结烟气经除尘和高效湿法脱硫后，烟温通常（50-200℃）较低且含有一些粉尘，导致该温度范围内缺少有效可行的化学脱硝手段。近年来的研究表明，当把烟温调节在45-50℃，生物过滤可在该温度下有效脱除氮氧化物（NOx），但多数研究仅停留在实验室模拟阶段。本项目根据烧结烟气氧含量高的特点，开展生物过滤方法脱硝所需解决的一些关键科学技术问题研究，包括：研究适合于烧结烟气环境生长的好氧反硝化微生物群落和高效脱硝所需的物理化学条件（温度、pH值、碳源、微量元素、气液流态、滤塔与填料结构等）；结合分子生物学技术，研究不同菌种间的共生特性与协同好氧反硝化机制；分析原位生物膜及其分离的菌种，并对主要微生物的反硝化酶进行体外分离、纯化和特性研究，以此确定生物膜内的活性菌种在反硝化过程中的关键作用；以及研究生物膜系统内的生物多样性变化与反硝化稳定性间的关系。从而证明生物过滤对于中低温烧结烟气脱硝具有可行性。

中文关键词： 烧结烟气；脱硝；生物过滤；氮氧化物；钢厂

英文摘要： The sintering flue gas after dust removal and wet desulfuration with a low discharge temperature (50-200℃) usually contains some of dust, which results in a lack of effective and feasible chemical denitrification. In recent years, when the temperature of flue gas controlled at 45-50℃. it has been proved that NOx in this temperature range can be effectively removed by biofiltration, but most studies are still in the laboratory simulation stage. Considering the characteristics of the sintering flue gas with high concentration of oxygen, this study aims at some key scientific and technological problems required to be solved in the biofiltration, including studying some physical chemical conditions (environmental temperature, pH, carbon sources, trace element, gas-liquid flow pattern, structures of trickling tower and packing materials, and so on ) required for aerobic denitrification microbe adapted to the real flue gas and for denitrification with high performance, investigating symbiosis traits among the different strains and the cooperative aerobic denitrification mechanism combined with molecular biology, analyzing in situ biofilm and the separated strains, isolating and purifying the denitrifying enzymes in vitro to determine the contribution of active strains in the biofilm in the aerobic denitrification path

英文关键词： sintering flue gas；denitrification；biofiltration；NOx；steel plant