摘要
为减少生物短程反硝化对外碳源的依赖,研究了无机环境下Fe(0)-活性炭强化短程反硝化的脱氮效果,并探究了不同铁碳比及初始pH值对系统脱氮效果及N+2O释放的影响.结果表明Fe(0)-活性炭可强化生物短程反硝化,将亚硝氮去除率由7.4%提高到31.1%.当m(铁)∶m(碳)由2∶1降至1∶1和1∶2时,反硝化速率与亚硝氮去除率均呈现先升后降的趋势,m(铁)∶m(碳)为1∶1时达到最大,分别为5.58 mg·(g·h)^(-1)与41.1%,且此时N+2O的释放量较小,为0.10 mg.当pH值由6.0升至9.0的过程中,反硝化速率由7.39 mg·(g·h)^(-1)下降至5.96 mg·(g·h)^(-1),N+2O的释放量由0.19 mg下降至0.12 mg.以上结果表明,在m(铁)∶m(碳)为1∶1和pH为弱酸性的条件下,Fe(0)-活性炭能强化短程反硝化获得较好的脱氮效果,但低pH值会增加N+2O的释放量.
In order to reduce the carbon source for biological short-cut denitrification,Fe^（0）-activated carbon was used to enhance nitrogen removal in the absence of organic carbon,and the influences of the Fe/C mass ratio and initial pH value on the nitrogen removal efficiency were explored. The results showed that the nitrite removal efficiency increased from 7. 4% to 31. 1% when the Fe^（0）-activated carbon was used to enhance short-cut denitrification. When the Fe/C mass ratio was reduced from 2∶ 1 to 1∶ 1 and 1∶ 2,both the denitrification rate and nitrite removal efficiency first increased and then decreased. At a Fe/C mass ratio of 1∶ 1,a maximum denitrification rate of 5. 58 mg·（g·h）^-1and a maximum nitrite removal efficiency of 41. 1% were achieved,respectively,and 0. 1 mg of nitrous oxide was emitted. When the pH value was increased from 6. 0 to 9. 0,the denitrification rate decreased from 7. 39 to 5. 96mg·（g·h）^-1,and the nitrous oxide emission decreased from 0. 19 to 0. 12 mg. Therefore,a higher nitrogen removal efficiency could be achieved by Fe^（0）-activated at a Fe/C mass ratio of 1∶ 1 and pH value of 6. 0. However,more nitrous oxide would be emitted at a low pH value.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2017年第5期1991-1996,共6页
Environmental Science
基金
国家自然科学基金项目(51108367)
陕西省建设厅科技发展计划项目(2015-K61)
关键词
零价铁
活性炭
短程反硝化
铁碳比
PH
zero valence iron
activated carbon
short-cut denitrification
Fe/C mass ratio
pH
