生物滴滤塔填料改性前后NO_x去除效果的对比试验研究  

Experimental contrast study on the removal efficiency of NO_x pre-and post-modifying filler in bio-trickling filter

作　　者：王蕙[1,2] 张承中[1] 刘晓伟[1] 魏晶[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]西安交通燃气有限责任公司,西安710077

出　　处：《安全与环境学报》2014年第5期195-200,共6页Journal of Safety and Environment

摘　　要：选取活性炭作为生物滴滤塔中微生物的载体,采用不同浓度的硝酸和氢氧化钠为改性剂对活性炭填料表面进行改性,分析对比不同改性条件下活性炭的物化性质及附着生物量,从而优化改性条件,并探讨填料改性对生物滴滤塔净化NOx工艺运行效果的影响。结果表明,不同浓度的硝酸和氢氧化钠中,1 mol/L的氢氧化钠改性效果最佳。改性后活性炭填料的形态、密度等基本性状均未发生较大变化,但比表面积较改性前增大了2倍左右,更适合微生物的生长繁殖,附着生物量最多。经最佳改性条件改性后的生物滴滤塔对NOx的去除效率明显提高,且稳定在87%-90%。在800-5 000 mg/m3范围内随机改变进气质量浓度,改性后的生物滴滤塔系统较改性前运行更稳定,抗负荷冲击能力更强。This paper is inclined to present the results of our experimental contrast study on the removal efficiency of NOx pre- and post- modifying filler in bio-trickling fher. In order to improve the removal efficiency with the biological method, we have chosen the activated carbon as the carrier of the microorganisms in bio-trickling filter, and adopted different concentrations of nitric acid and sodium hydroxide as modifier by way of denitrification of the single strain in bio-trickling filter. In addition, we have gained the pseudomonas in the laboratory with screening and culturing. The surface of the activated carbon filler can thus be made larger. By analyzing the physico-chemical properties and attached biomass of the activated carbon under different modification conditions, the modification condition can be further optimized. Moreover, the paper has also made a discussion on the process operation effect of biotrickling filter on NOx ＇ s purification due to the filler modification. The results of our experimental contrast study indicate that the modification effect of sodium hydroxide with concentration of 1 mol/L turned out to be the best. Under the above said conditions, it was possible to change a bit of the general characteristic feature of the activated carbon filler, such as its morphology and density through modification. In addition, the specific surface area of the activated carbon can also be made to increase twice, which is more suitable for the growth of microorganism. And the biomass can be made to its maximum, getting to as high as 1.55 mol/L with the film forming cycle shortened in 2 days. Furthermore, in the optimal modifying conditions, it would also be possible to significantly improve the removal efficiency of NO, in bio-trickling filter by 10% - 20% than it was through modification and then get stabilized in the range of 87 % - 90 % . Such a situation would come about when the inlet concentration of NO- can gradually rise from 350 mg/m3 to 2 700 mg/m3. In order to test the stability of the b

关 键 词：环境工程学 填料改性 活性炭 生物滴滤塔 NOx 对比试验 

分 类 号：X511[环境科学与工程—环境工程]