内蒙古部分河段表层沉积物对氨氮的吸附/解吸行为研究
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摘要
通过实验室模拟的方法研究了老哈河、霍林河和乌梁素海(入湖口和湖中)的沉积物对NH~+_4-N的吸附特征.结果显示:(1)沉积物吸附氨氮的过程可以用Lagergren准二级吸附动力学方程描述,拟合得出平衡时最大吸附量为23.64 mg/kg;(2) Langmuir等温方程拟合的吸附等温线表明沉积物吸附NH~+_4-N的最大吸附容量范围是1428.75～3333.33 mg/kg,属于单分子层吸附.吸水过程及表面形貌可能对NH~+_4-N的吸附能力有影响.Freundlich吸附等温模型拟合得出常数0.8206<(1/n)<1.1100,说明沉积物对NH~+_4-N的吸附过程均易于进行;(3)采样点的吸附解吸平衡浓度均大于水体中的NH~+_4-N浓度,为"氮源",且对氨氮的吸附均属于不可逆反应.
In this paper,the characteristic of ammonium adsorption on surface sediments from the Laoha River,Huolin River and Wuliangsuhai in Inner Mongolia was studied in laboratory simulated conditions.The results showed that:(1) Adsorption of ammonium in surface sediments followed the Lagergren's second-order adsorption kinetics model and the maximum amount of adsorption capacity was 23.64 mg/kg.(2) The correlation R~2 between the adsorption isotherm of ammonium in surface sediments and the Langmuir adsorption isothermal model was 0.967 8～0.989 2,in the range,there was a significant correlation.The constant 1/n matched by Freundlich adsorption isothermal model was within the limits of 0.820 6～1.110 0,suggesting that the adsorption of ammonium in sediments was an easier process.(3) The adsorption/desorption equilibrium concentration in the sampling site was higher than the concentration in the water body,named "nitrogen source",the ammonium adsorption behavior was an irreversible reaction.
In this paper,the characteristic of ammonium adsorption on surface sediments from the Laoha River,Huolin River and Wuliangsuhai in Inner Mongolia was studied in laboratory simulated conditions.The results showed that:(1) Adsorption of ammonium in surface sediments followed the Lagergren's second-order adsorption kinetics model and the maximum amount of adsorption capacity was 23.64 mg/kg.(2) The correlation R~2 between the adsorption isotherm of ammonium in surface sediments and the Langmuir adsorption isothermal model was 0.967 8～0.989 2,in the range,there was a significant correlation.The constant 1/n matched by Freundlich adsorption isothermal model was within the limits of 0.820 6～1.110 0,suggesting that the adsorption of ammonium in sediments was an easier process.(3) The adsorption/desorption equilibrium concentration in the sampling site was higher than the concentration in the water body,named "nitrogen source",the ammonium adsorption behavior was an irreversible reaction.
引文
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[2] 杨龙元,蔡启铭,秦伯强,等. 太湖梅梁湾沉积物-水界面氮迁移特征初步研究 [J]. 湖泊科学,1998,10(4):41-47.
[3] Shen S Y,Shu I T,Kemper W D. Equilibrium and Kinetic study of ammonium adsorption and fixation in sodium-treated vermiculite [J]. Soil Society of American Journal,1997,61(6):1611-1618.
[4] 王晓丽,王慧娟,乌英嘎. 黄河内蒙古段表层沉积物对氨氮的吸附特征 [J]. 环境工程,2016,34(6):80-84.
[5] 刘敏,侯立军,许世远,等. 长江口潮滩表层沉积物对氨氮的吸附特性 [J]. 海洋学报,2005,27(5):60-66.
[6] 王圣瑞,金相灿,赵海超,等. 长江中下游浅水湖泊沉积物对磷的吸附特征 [J]. 环境科学,2005,26(3):38-43.
[7] Hou L J,Liu M. Ammonium adsorption by tidal flat surface sediments from the Yangtze Estuary [J]. Environmental Geology,2003,45(1):72-78.
[8] 赵东洋,王雅迪,王而力. 沉积物不同天然有机组分对氨氮解吸特征的影响 [J]. 地球环境学报,2015,6(2):113-119.
[9] 翟丽华,刘鸿亮,徐红灯,等. 浙江某农场土壤和沟渠沉积物对氨氮的吸附研究 [J]. 环境科学,2007,(8):1770-1773.
[10] 邹航,王立立,柳蓉. 珠江河口湿地沉积物吸附氨氮及影响因素研究 [J]. 环境污染与防治,2014,36(3):46-51.
[11] 陈静生,王飞越,陈江麟. 论小于63 μm粒级作为水体颗粒物重金属研究介质的理性及有关粒级转换模型研究 [J]. 环境科学学报,1994,14(4):419-425.
[12] 中国科学院南京土壤研究所. 土壤理化分析 [M]. 上海:上海科学技术出版社,1978.
[13] 国家环境保护总局. 水和废水监测分析方法 [M]. 北京:中国环境科学出版社,2002.
[14] Suna Balci. Nature of ammonium ion adsorption by sepiolite:Analysis of equilibrium data with several isotherms [J]. Water Research,2004,38(5):1129-1138.
[15] 张先明,潘波,刘文新,等. 天然土壤中菲的解吸行为特征研究 [J]. 环境科学,2007,28(2):272-277.
[16] Rosenfeld J K. Ammonium adsorption in nearshore anoxic sediments [J]. Limnology and Oceanography,1979,24(2):356-364.
[17] Rysgass S,Thastum P,Dalsgaard T,et al. Effects of salinity on NH~+_4 adsorption capacity,nitrification,and denitrification in Danish Estuary sediments [J]. Estuaries,1999,22(1):21-30.