摘要
人工湿地甲烷排放驱动对全球变暖具有重要作用,为控制甲烷排放同时提高污水去除效率,构建了5层不同介质组成的复合垂直流人工湿地系统(Integrated Vertical-Flow Constructed Wetland,IVCW),利用现场监测和动力学模型分析添加不同浓度葡萄糖碳源对甲烷排放驱动和总氮(TN)、化学需氧量(COD)去除率的影响.结果表明:添加0.5、1、2和4 mmol/L葡萄糖溶液时,(1)甲烷排放通量分别为4、3.50、3.90和3.40 mol m^(-2) d^(-1),比空白实验分别增加了27%、12%、24%和9.80%;(2)对应的风车草茎叶系统甲烷排放通量比根水系统分别高了0.90、1.60、1.50和0.70 mol m^(-2)d^(-1);(3)同时IVCW对碳平均利用率分别为32.17%、53.51%、76.86%和76.72%;TN平均去除率分别为37.30%、11.14%、14.79%和48.75%,COD平均去除率分别为70%、91.10%、98.78%和92.31%.(4)葡萄糖驱动IVCW甲烷排放可认为符合二级动力学方程,其甲烷驱动常数为49.64 mg/h.本研究结果表明添加葡萄糖驱动IVCW的甲烷排放处于较高水平,甲烷平均排放通量增加了18.2%,可为IVCW处理污水过程中甲烷排放提供参考.
Methane emissions from constructed wetlands （CWs） contribute to global warming. This study aimed to investigate the effect of glucose addition in CWs on methane emission. Field monitoring and the dynamic model analysis were used to investigate the effect of adding different glucose concentrations as carbon sources on methane emission, TN degradation, and COD degradation in an integrated vertical-flow constructed wetland （IVCW） system composed of five layers filled with different materials. When glucose concentrations of 0.5 mmol/L, 1.0 mmol/L, 2.0 mmol/L, and 4.0 mmol/L were added separately into the IVCW, results showed that： （1） methane emission from IVCW was 4.0 mol m^-2 d^-1, 3.5 mol m^-2 d^-1, 3.9 mol m^-2 d^-1, and 3.4 mol m^-2 d^-1, respectively, increasing by 27.0%, 12.0%, 24.0%, and 9.8%, respectively, compared with the blank experiment. （2） Accordingly, methane emissions from the Cyperus alternifolius L. stem^-leaf system in the IVCW were 0.9 mol m^-2 d^-1, 1.6 mol m^-2 d^-1, 1.5 mol m^-2 d^-1, and 0.7 mol m^-2 d^-1, respectively, and were higher than those from the C. alternifolius L. root-water in the IVCW system. （3） Average carbon utilization rates in the IVCW were 32.17%, 52.28%, 76.86%, and 76.72%, respectively, with corresponding average TN removal rates of 37.30%, 11.14%, 14.79%, and 48.75% and average COD removal rates of 70.00%, 91.10%, 98.78%, and 92.31%, respectively. （4） Furthermore, it was found that methane emissions driven by adding glucose in the IVCW was considered as the second-order dynamic kinetic model with methane kinetic constant of 49.64 mg/h. With the average methane emissions increasing by 18.2%, methane emissions driven by adding glucose in the IVCW was considered to be high, which can help to understand the relationship between methane emissions from CWs and carbon source.
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2017年第4期719-727,共9页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金面上项目(51278318)
四川省科技厅科技支撑计划(2013SZ0103)
四川省人社厅省学术和技术带头人培养项目(2011HB001)
成都市科技局惠民项目(2015-HM01-00325-SF)资助~~
关键词
葡萄糖碳源
复合垂直流人工湿地(IVCW)
甲烷排放
风车草
glucose as carbon source
Integrated Vertical-Flow Constructed Wetland
methane emissions
Cyperus alternifolius L.
