摘要
除草剂在农业中的广泛使用造成农业土壤中的污染问题,并且除草剂在土壤中垂直迁移会进一步造成地下水污染。基于此,提出将城市污水厂剩余污泥热解制备的生物炭用于农业土壤来抑制除草剂在土壤中的迁移。通过吸附动力学试验,证实污泥基生物炭吸附莠去津和麦草畏的反应过程符合伪二级动力学模型,包括快速吸附和慢速吸附反应两个阶段。通过等温吸附试验确定了吸附机理属于Langmuir模型,依靠疏水性物质通过非共价键的π-π堆积方式进行相互作用,发生单分子层吸附。土柱试验证实了污泥基生物炭可有效抑制莠去津和麦草畏在实际土壤中的迁移,且温度对吸附过程的影响较小。
The widespread use of herbicides in agriculture causes pollution problems in agricultural soils,and vertical migration of herbicide would further pollute underground water.Based on this,this paper put forward that biochar synthesizing from wasted activated sludge by pyrolysis method to resist the migration of herbicide.Through the adsorption kinetics experiment,it was proved that Pseudo-second order kinetic model was fitted with the removal process of atrazine and dicamba by adsorption of biochar,including fast adsorption phase and slow adsorption phase.The adsorption was attributed byπ-πaccumulation mode from non-covalent bond of hydrophobic substances,which fitted with Langmuir model.Simulated experiment of soil column approved that biochar could effectively resist the removal of atrazine and dicamba in actual soil matrix,and proposed that temperature showed the least influences on the removal efficiency.
作者
杨雪
YANG Xue(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd,Shanghai 200093,China)
出处
《农业科技与装备》
2017年第12期10-13,共4页
Agricultural Science & Technology and Equipment
基金
国家自然科学基金青年科学基金项目(51508398)
