污染控制技术及原理
孙洪伟,魏东洋,王淑莹,时晓宁,张树军,杨庆,彭永臻.DO对高氨氮渗滤液短程生物脱氮反硝化过程动力学的影响[J].环境科学学报,2010,30(5):935-940
DO对高氨氮渗滤液短程生物脱氮反硝化过程动力学的影响
- The effect of DO on the kinetics of denitritation and partial nitrogen removal from landfill leachate with high ammonia concentration
- 基金项目：国家自然科学基金(No.50978003);北京市自然科学基金重点项目(No.8091001)
- 作者
- 单位
- 孙洪伟
- 北京工业大学北京市水质科学与水环境恢复工程重点实验室, 北京 100124
- 魏东洋
- 环境保护部华南环境科学研究所, 广州 510655
- 王淑莹
- 北京工业大学北京市水质科学与水环境恢复工程重点实验室, 北京 100124
- 时晓宁
- 北京工业大学北京市水质科学与水环境恢复工程重点实验室, 北京 100124
- 张树军
- 北京工业大学北京市水质科学与水环境恢复工程重点实验室, 北京 100124
- 杨庆
- 北京工业大学北京市水质科学与水环境恢复工程重点实验室, 北京 100124
- 彭永臻
- 北京工业大学北京市水质科学与水环境恢复工程重点实验室, 北京 100124
- 摘要：为考察实际高氨氮垃圾渗滤液短程生物脱氮过程DO对以NO2--N为电子受体反硝化动力学的影响,本研究采用缺氧/厌氧UASB-SBR生化系统处理实际高氨氮垃圾渗滤液,在SBR系统实现稳短程生物脱氮(120d运行)的基础上,取SBR反应器内的污泥进行pH8.0条件下不同DO浓度梯度反硝化批次试验,从而确定DO对以NO2--N为电子受体的溶解氧抑制系数(K′O)的影响.试验结果表明,DO对反硝菌的NO2--N还原活性具有明显影响,与缺氧状态相比,DO为0.4和0.6mg·L-1时,其还原活性分别降低了49.0%和16.3%左右.DO与NO2--N还原速率两者呈指数负相关.DO对NO2--N为电子受体K′O具有显著影响,存在明显的分段现象,每一DO范围内,K′O恒定.
- Abstract：The effect of dissolved oxygen (DO) on the kinetics of denitritation using nitrite as electron acceptor was investigated in this study. Alab-scale UASB-SBRsystem was operated to achieve nitrogen removal via nitrite from landfill leachate with high ammonia concentration. Stable partial nitration was successfully achieved in the SBRafter 120 days. Batch tests were performed to assess the effect of DOconcentration on the DOinhibition coefficient (K′O) of denitritation using the sludge from the SBRat different DOgradients and constant pH8.0. DOhas a significant inhibitory effect on the activity of denitrifying bacteria. The nitrite reduction rate decreased approximately 49% and 16.3% of its maximum rate at DOconcentrations of 0.4 mg·L-1 and 0.6 mg·L-1,respectively. Anegative exponential formula was established to describe the relationship between DOconcentration and nitrite reduction rate. Distinct values were obtained by linear regression within three different DOranges (DO≤0.4mg·L-1,0.4 mg·L-1≤DO≤0.72 mg·L-1 and 0.72 mg·L-1≤DO≤1.03 mg·L-1). However,the K′Owas constant in each DOrange.
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