厌氧氨氧化塔式生物滤池脱除NO研究
发布时间：2018-09-10 09:19
【摘要】：氮氧化物(主要成分为NO)是常见的大气污染物,对生态环境和人类健康都存在危害。物化法处理NO工艺存在操作条件苛刻、催化剂易失活、存在二次污染等问题。生物法处理NO工艺具有操作简单、投资成本低、无二次污染等优点。与反硝化为主的NO生物脱除工艺相比,厌氧氨氧化工艺脱除NO无需外加碳源,无温室气体排放。该工艺不仅为脱除高浓度NO提供了新的思路,还丰富了厌氧氨氧化菌的底物。本实验采用塔式生物滤池反应器,以火山岩填料作为生物膜载体。初始以NH4+-N与NO2--N为底物,31天后完成厌氧氨氧化菌挂膜。然后从滤池底通入不同浓度的NO气体,从滤池上部喷淋含有NH4+-N与NO2--N的液体(实验后期无N02--N),研究不同进水浓度与进气NO浓度对反应器脱除NO性能的影响。主要实验结论如下：(1)厌氧氨氧化菌能直接以NO-N作为电子受体、NH4+-N为电子供体进行反应,反应比例为NH4+-N潲耗:NO-N消耗:NO3--N生成=1:1.12:0.11。(2)进气NO浓度从4018 mg/m3升高至8036 mg/m3时,生物膜颜色变黑,厌氧氨氧化菌活性降低,TN和NO去除负荷分别下降了47.1%和69.6%,NO-N在混合电子受体中比例从78.8%降低至44.1%。随后将进水N02-N浓度从20 mg/L提高至60 mg/L,厌氧氨氧化菌活性恢复,TN和NO去除负荷分别提高2.4倍与2.1倍。(3)进水NO2--N浓度20 mg/L,进气NO浓度4018 mg/m3,气体空塔停留时间2.3min,温度38℃时,NO去除负荷最高达165.8 g NO-N/(m3·d),NO去除率为54.2%。进水无NO2--N,其他条件不变,NO去除负荷最高达132 g NO-N/(m3·d),NO去除率为43.1%。(4)通过16S rDNA测序,在稳定阶段,厌氧氨氧化菌的比例为80.9%,其中Candidatus Kuenenia stuttgartiensis菌属在厌氧氨氧化菌中的比例为89.1%。
[Abstract]:Nitrogen oxides (NO) are common atmospheric pollutants, which are harmful to ecological environment and human health. The physicochemical treatment of NO process has some problems, such as harsh operation conditions, deactivation of catalyst and secondary pollution. Biological treatment of NO process has the advantages of simple operation, low investment cost and no secondary pollution. Compared with denitrification-based NO biological removal process, anaerobic ammonia oxidation process for NO removal without additional carbon sources, no greenhouse gas emissions. This process not only provides a new idea for the removal of high concentration NO, but also enriches the substrate of anaerobic ammonia-oxidizing bacteria. In this experiment, tower biofilter reactor was used, and volcanic rock filler was used as biofilm carrier. NH4-N and NO2--N were used as substrate for 31 days. Then different concentrations of NO gas were introduced from the bottom of the filter, and the liquid containing NH4 -N and NO2--N was sprayed from the upper part of the filter (no N02--N) in the later stage of the experiment. The effects of different influent concentration and NO concentration on the removal of NO in the reactor were studied. The main results are as follows: (1) anaerobic ammonia oxidizing bacteria can react directly with NO-N as electron acceptor NH _ 4-N as electron donor, and the reaction ratio is NH4 -N hogwash consumption: no _ 3 N consumption to form 1: 1.12: 0.11. (2) when the concentration of NO in inlet air increases from 4018 mg/m3 to 8036 mg/m3, When the biofilm color became black, the activity of anaerobic ammonia-oxidizing bacteria decreased the removal load of TN and NO decreased by 47.1% and 69.6%, respectively, and the proportion of NO-N in the mixed electron acceptor decreased from 78.8% to 44.1%. Then, the influent N02-N concentration was increased from 20 mg/L to 60 mg/L,. The removal load of TN and NO were increased by 2.4-fold and 2.1-fold respectively. (3) the residence time of influent NO2--N concentration 20 mg/L, intake air NO 4018 mg/m3, air column was 2.3 mins and the temperature was 38 鈩，
本文编号：2234024
[Abstract]:Nitrogen oxides (NO) are common atmospheric pollutants, which are harmful to ecological environment and human health. The physicochemical treatment of NO process has some problems, such as harsh operation conditions, deactivation of catalyst and secondary pollution. Biological treatment of NO process has the advantages of simple operation, low investment cost and no secondary pollution. Compared with denitrification-based NO biological removal process, anaerobic ammonia oxidation process for NO removal without additional carbon sources, no greenhouse gas emissions. This process not only provides a new idea for the removal of high concentration NO, but also enriches the substrate of anaerobic ammonia-oxidizing bacteria. In this experiment, tower biofilter reactor was used, and volcanic rock filler was used as biofilm carrier. NH4-N and NO2--N were used as substrate for 31 days. Then different concentrations of NO gas were introduced from the bottom of the filter, and the liquid containing NH4 -N and NO2--N was sprayed from the upper part of the filter (no N02--N) in the later stage of the experiment. The effects of different influent concentration and NO concentration on the removal of NO in the reactor were studied. The main results are as follows: (1) anaerobic ammonia oxidizing bacteria can react directly with NO-N as electron acceptor NH _ 4-N as electron donor, and the reaction ratio is NH4 -N hogwash consumption: no _ 3 N consumption to form 1: 1.12: 0.11. (2) when the concentration of NO in inlet air increases from 4018 mg/m3 to 8036 mg/m3, When the biofilm color became black, the activity of anaerobic ammonia-oxidizing bacteria decreased the removal load of TN and NO decreased by 47.1% and 69.6%, respectively, and the proportion of NO-N in the mixed electron acceptor decreased from 78.8% to 44.1%. Then, the influent N02-N concentration was increased from 20 mg/L to 60 mg/L,. The removal load of TN and NO were increased by 2.4-fold and 2.1-fold respectively. (3) the residence time of influent NO2--N concentration 20 mg/L, intake air NO 4018 mg/m3, air column was 2.3 mins and the temperature was 38 鈩，
本文编号：2234024
本文链接：https://www.wllwen.com/kejilunwen/huanjinggongchenglunwen/2234024.html
最近更新
教材专著
