摘要
采用静态吸附法研究了聚丙烯酰胺(PAM)在大庆市盐碱土中的吸附行为,并通过室内土柱实验研究了PAM 在盐碱土中的自然迁移和模拟降雨情况下的迁移行为。实验结果表明,随吸附时间延长、液固比增大,PAM在盐碱土中的吸附量逐渐增大。PAM 在盐碱土中的饱和吸附条件为液固比25,平衡吸附时间8 h,在此条件下得出的 PAM 在盐碱土中的吸附等温线符合 Langmuir 等温吸附模型,饱和吸附量为0.81 mg/g。PAM 在盐碱土中的迁移规律为:沿地表随盐碱土深度增加,PAM 的含量减少。PAM 溶液淋滤量越大,迁移深度越深,各层土壤中PAM 的含量也相应增加。降雨迫使 PAM 沿地表向下多迁移1 cm,迁移深度在5～6 cm。盐碱土对 PAM 的截留能力较强,意外泄漏的 PAM 主要集中在地表下3 cm 以内处,占总淋滤量的86.1%～99.9%。PAM 在大庆市盐碱土中的迁移深度不超过10 cm。
The adsorption of polyacrylamide（PAM） on Daqing saline alkali soil was studied by means of static adsorption method, and the transferring behaviors of PAM under natural and simulated rainfall conditions were also studied by soil column experiments in laboratory. The results show that the adsorption of PAM on saline alkali soil increases with the increasing adsorption time and liquid/solid ratio. The saturation adsorption time is 8 h under the condition of liquid/solid ratio 25. The adsorption isotherms is consistent with Langmuir model, and the saturation adsorption amount is 0.81 mg/g. The vertical migration law of PAM in saline alkali soil was found： The content of PAM decreases with the soil depth increasing ; The higher the leaching amount of PAM, the larger the content of PAM in each soil layers. Under the rainfall simulation condition, PAM is forced to transfer more i cm deep, and the maximum transferring depth is about 5 - 6 cm. PAM has a high adsorptive affinity for saline alkali soil, and 86.1% - 99.9% of accidentally released PAM will be kept in the soil of above 3 cm deep. The migration depth of PAM in Daquing saline alkali soil has not exceeded 10 cm.
出处
《化工环保》
CAS
CSCD
北大核心
2008年第6期500-504,共5页
Environmental Protection of Chemical Industry
关键词
聚丙烯酰胺
盐碱土
吸附
迁移
polyacrylamide
saline alkali soil
adsorption
migration
