| 盐度对准好氧矿化垃圾生物反应器渗滤液处理及N2O产生的影响 |
| 摘要点击 2248 全文点击 1451 投稿时间：2015-06-28 修订日期：2015-09-11 |
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| 中文关键词 盐度 准好氧矿化垃圾生物反应器 矿化垃圾 渗滤液 氧化亚氮 |
| 英文关键词 salinity semi-aerobic aged-refuse bioreactor (SAARB) aged-refuse leachate nitrous oxide (N2 O) |
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| 中文摘要 |
| 准好氧矿化垃圾生物反应器对渗滤液具有良好的脱氮效果,但在硝化反硝化过程中有强温室气体N2 O的产生. 本文主要研究了不同回灌渗滤液盐度(7~30 g ·L-1)对准好氧矿化垃圾生物反应器渗滤液处理及N2 O产生的影响. 结果表明,进水盐度的增加对COD去除效果影响较小,其去除率始终大于85%; 然而盐度对氮污染物去除效果的影响较大. NH4+-N和TN的去除率由7 g ·L-1时的98.23%、 91.48%下降至30 g ·L-1时的31.75%、 34.24%. 此外,盐度在30 g ·L-1时,出现了显著的NO2--N积累现象. 盐度对硝化、 反硝化细菌均有不同的抑制作用,其中,对硝化菌的抑制作用大于反硝化菌. 随着盐度的增加,N2 O产生量大幅增加,在盐度为30 g ·L-1时N2 O产生量最高,为1397 μg±369.88 μg,占TN去除总量的8.87‰,是低盐度条件下(7~20 g ·L-1) 的6~117倍,单周期内N2 O产生峰值随着盐度增加呈延后趋势. 从上述实验结果可知,渗滤液回灌处理时,进水盐度过高会影响脱氮效果及N2 O释放. 可见,盐度是渗滤液回灌时重要的控制因素. |
| 英文摘要 |
| Semi-aerobic Aged-refuse Bioreactor (SAARB) has a good effect on nitrogen removal in leachate, but a strong greenhouse gas (N2 O) was generated during the nitrification and denitrification process. The effect of salinity (7-30 g ·L-1) on the leachate treatment and the N2 O production from SAARB system was investigated. Experimental results showed that salinity ranging from 7 to 30 g ·L-1 had no significant effect on COD removal, and the removal efficiency was always more than 85%. On the contrary, it had a strong influence on the removal of nitrogen. The removal efficiencies of NH4+-N and TN decreased from 98.23% and 91.48% at 7 g ·L-1 salt to 31.75% and 34.24% at 30 g ·L-1 salt, respectively. Moreover, there was significant nitrite (NO2--N) accumulation in the presence of 30 g ·L-1 salt. Meanwhile, salinity had different inhibition strength on nitrification and denitrification bacteria, and the order of inhibition strength was as follows: nitrification bacteria>denitrification bacteria. In addition, the N2 O production increased with salinity concentration, and the highest N2 O accumulation (1397 μg±369.88 μg) was observed with addition of 30 g ·L-1 salt, which accounted for 8.87‰ of the total nitrogen removal. Meanwhile, it was 6-117 times higher in the presence of 30 g ·L-1 salt than that in low salinity conditions (7-20 g ·L-1). And the peak time of the N2 O production showed a delayed trend. These results indicated that salinity recirculation in leachate had a negative effect on the nitrogen removal and N2 O production. Overall, salinity seemed to be a key parameter during leachate recirculation. |
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