School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, China.
Environ Technol. 2011 Oct;32(13-14):1589-95. doi: 10.1080/09593330.2010.545080.
Nitrate leaching contaminates groundwater. The objective of this study was to determine if reed and rice stalks could enhance denitrification and reduce nitrate leaching into groundwater. Artificial groundwater spiked with nitrate and field groundwater samples were tested in the columns in sand reactors packed with either reed or rice stalks. The maximum nitrate removal rates were determined to be 1.93 and 1.97 mg nitrate-N l(-1) h(-1), respectively, in the reed and rice stalk-packed columns. The maximum nitrate-nitrogen removal rate in reactors packed with reed stalk was 1.33 mg nitrate-N l(-1) h(-1) when experimented with natural groundwater. Chemical oxygen demand consumption was higher when rice stalk (176.1 mg l(-1)) was used as the substrate, compared to reed stalk (35.2 mg l(-1)) at the same substrate dosage. No nitrite accumulation was detected during the test. The results demonstrate that agricultural byproducts, such as reed and rice stalks, may be used as substrate amendments for enhanced denitrification in natural settings, such as lakeside lagoons, ditches or wetlands.
硝酸盐淋滤污染地下水。本研究旨在确定芦苇和稻草是否可以增强反硝化作用并减少硝酸盐向地下水中的淋滤。在装有芦苇或稻草的砂柱中，用人工添加硝酸盐的地下水和现场地下水样品进行了测试。在芦苇和稻草填充柱中，硝酸盐的最大去除率分别为 1.93 和 1.97mg 硝酸盐-N l(-1) h(-1)。当用天然地下水进行实验时，在装有芦苇草的反应器中，硝酸盐氮的最大去除率为 1.33mg 硝酸盐-N l(-1) h(-1)。当使用稻秸（176.1mg l(-1)）作为基质时，化学需氧量的消耗高于使用芦苇草（35.2mg l(-1)）时的消耗，在相同的基质剂量下。在测试过程中未检测到亚硝酸盐积累。结果表明，农业副产品，如芦苇和稻草，可以作为天然环境（如湖滨泻湖、沟渠或湿地）中增强反硝化作用的基质改良剂。
