再生水干湿交替入渗过程中添加碳源对包气带脱氮的影响  

Impact of Adding Carbon Source on Nitrogen Removal in Vadose Zone During the Alternative Leaching and Drying Using Reclaimed Water

作　　者：张沙莎[1,2] 靳孟贵[1] 梁杏[1] 

机构地区：[1]中国地质大学环境学院,武汉430074 [2]中国地质大学生物地质与环境地质国家重点实验室,武汉430074

出　　处：《地质科技情报》2011年第4期115-119,共5页Geological Science and Technology Information

基　　金：国家高技术研究发展计划项目(2007AA06Z337);博士学科点基金(20100145110010)

摘　　要：干湿交替的回灌方法常被用于解决再生水地表回灌的堵塞问题,但干湿交替回灌可能造成硝态氮被淋洗进入地下水。通过室内土柱模拟入渗实验,对比研究了以葡萄糖作为碳源的低碳氮比再生水干湿交替回灌、干期前蒸馏水淋洗、干期前添加甲醇溶液和干期后添加甲醇溶液4种条件下对包气带氮素迁移转化和脱氮效果的影响。实验表明,对于碳氮比为2.5∶1的再生水,与葡萄糖相比,使用甲醇作为碳源时,出水中硝态氮和总氮浓度下降速度较快,反硝化作用效率较高。干期后及时注入甲醇脱氮效果明显高于干期前添加甲醇,回灌过程中甲醇被生物利用率高,高碳氮比增强了包气带反硝化作用,脱氮效果明显且持久。合理利用葡萄糖、甲醇作碳源可以促进生物脱氮,是再生水回灌过程中脱氮的途径之一。The way of alternative leaching and drying has been widely used to solve the clogging problem of surface groundwater recharge. A soil column experiment was conducted to compare the transformation of nitrogen and the effect of nitrogen removal by adding different carbon sources during alternative leaching and drying process using reclaimed water. The four different conditions were low C ： N ratio of reclaimed water infiltrating during the alternative leaching and drying with glucose as carbon source, injecting distilled water before drying period, injecting methanol before and after drying period. The experiment shows when methanol is used as carbon source, the concentration of nitrate-N and total nitrogen in effluent decreases quickly and the denitrification is more efficient than that of glucose. Injecting methanol after period timely can remove nitrogen faster than the other ways. Methanol can be used by microorganisms with high utilization during the infiltration process and high C ： N ratio can strengthen the denitrification in vadose zone, which will have a significant effect on nitrogen removal for a longer time. Therefore, it is a way to add adequate glucose or methanol as carbon source for removing nitrogen during the reclaimed water infiltration.

关 键 词：包气带 再生水 干湿交替 生物脱氮 甲醇 

分 类 号：X523[环境科学与工程—环境工程]