泥沙质量浓度和pH对不同粒径泥沙吸附磷影响研究  

EFFECT OF SEDIMENT MASS CONCENTRATION AND pH ON PHOSPHORUS ADSORPTION AT DIFFERENT SEDIMENT SIZE

作　　者：崔双超[1] 丁爱中[1] 潘成忠[1] 李长嘉[1] 鄢正红[1] 郝丽芬[2] 

机构地区：[1]北京师范大学水科学研究院,教育部水沙科学重点实验室,北京100875 [2]太原电力高等专科学校,太原030013

出　　处：《北京师范大学学报（自然科学版）》2012年第5期582-586,共5页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(41040028);中央高校基本科研业务费专项资助项目;水体污染控制与治理科技重大专项河流主题特殊类型河流项目渭河资助课题(2009ZX07212-002);北京市委、市政府重点工作及区县政府应急预启动资助项目(Z10110605540000)

摘　　要：以北京大兴南海子湖表层沉积物为研究对象,测试分析了粒径φ<0.246mm、泥沙在含沙质量浓度为5、10、30、50g·L-1对磷的吸附过程,以及细砂(>0.147～0.246 mm)、极细砂(>0.074～0.147 mm)、粉粒(>0.038 5～0.074 0mm)和粉粒粘粒混合物(≤0.038 5mm)4种粒径泥沙在不同pH值条件下对磷的吸附行为.研究结果表明:二级动力学方程能够比较理想地反映南海子泥沙对磷的吸附动力学过程(R2>0.98),吸附平衡时单位质量泥沙饱和吸附量由大到小排序为:粉粒黏粒混合物(0.107mg·g-1)、粉粒(0.096mg·g-1)、细砂(0.095mg·g-1)、极细砂(0.051mg·g-1)·pH值对极细砂、粉粒、粉粒黏粒混合物影响相似,pH值为4～10之间,吸附量变化不大,在pH>10时,吸附量降低,pH<4时,吸附量升高.在磷初始质量浓度ρ0>1.2mg·L-1时,随着泥沙质量浓度增大水溶液中磷吸附的绝对量升高,从最大吸附容量(Xm)来看,单位质量泥沙吸附磷量降低,泥沙之间对磷的吸附存在竞争且与磷初始质量浓度有关.Surface sediments was collected from Nanhaizi Lake,Beijing.Phosphorus adsorption by sediments 0.246 mm showed that sediment mass concentration was 5、10、30 and 50 g·L-1.Effect of pH on phosphorus adsorption for four particle size sediments included fine sand（0.147-0.246 mm）,very fine sand（0.074-0.147 mm）,silt（0.0385-0.0740 mm）,mixture of silt and clay（≤0.0385 mm）.Data showed that the second order kinetics model could well describe the behaviors of phosphorus sorption with determination coefficients of R2（0.98）.The saturation adsorption capacity（Cse） of different size particles was in the following order： silt and clay（0.107 mg·g-1）,silt（0.096 mg·g-1）,fine sand（0.095 mg·g-1） and very fine sand（0.051 mg·g-1）.The impact of pH on the very fine sand,silt,silt and clay mixture was similar.When pH was between 4 and 10,the adsorption capacity remained unchanged.The adsorption decreased with pH10,and the adsorption capacity increased at pH4 for phosphorus initial mass concentrations 1.2 mg·L-1.With the increase of sediment mass concentration,the absolute phosphorus adsorption amount increased.However,the unit mass sorption decreased,and there was a competitive adsorption among sediments and related phosphorus initial mass concentrations.

关 键 词：泥沙 PH 质量浓度 磷 吸附 

分 类 号：O484.1[理学—固体物理]