摘要:
采用多孔球型悬浮填料挂膜的生物塔净化低浓度氮氧化物废气的研究结果表明,氮氧化物的净化效率可达60%，适宜的入口NOx浓度为130 mg/m3，O2体积含量为18%，空床停留时间为29 s，循环液流量为116.8 L/h, 循环液pH为7.49~8.05，压降为244.9 Pa，温度为22~28 ℃。NO-3和NO-2浓度相近的现象说明反硝化细菌存在，并发挥着反硝化作用，将部分NO-3转化为NO-2。
Abstract:
The research uses biological trickling filter as the central setting, which is filled with plastic suspending sphere padding whose diameters are 2.5 centimeters. The activated sludge found in the final settling tanks of a municipal sewage treatment plant is used to hang the microorganism membrane on the padding .When the membrane is mature, the rate of purification is stable, then the experiment of NOx removal can be set up. The research pays special attention to the effects of various factors to NOx removal, such as the concentration of input NOx, the volume fraction of O2, retention time, circulated flow, pH, drop in pressure and temperature, aiming at determining the appropriate condition for NOx removal. The experimental results suggest that 60% removal rate can be obtained, and the appropriate input concentration of NOx is about 130 mg/m3,the volume fraction of O2 is about 18%,the proper retention time is 29 s, the circulated flow is 116.8 L/h, the pH should be 7.49~8.05, the best drop in pressure is 244.9 Pa and the temperature is 22~28 ℃.
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