检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:黄晟 HUANG Sheng(Shanghai Municipal Engineering Design Institute
出 处:《净水技术》2019年第6期122-130,共9页Water Purification Technology
基 金:上海市科学技术委员会科研计划项目(17210731100,18DZ1204303);上海市青年科技英才扬帆计划(19YF1445100)
摘 要:研究了典型有机农药及重金属/有机农药复合污染物在建筑废物表面的吸附作用机制。其中砖粉对各农药污染物的吸附量为0.02~0.2mg/g,平衡吸附时间约为45min,吸附量与废物的比表面积和亲水性略呈负相关性。农药污染建筑废物对重金属的复合吸附过程较为复杂,其主要是由于有机絮状物与重金属的结合作用以及有机农药的包裹特征。相比于洁净废物,甲拌磷和二硫代磷酸二乙酯污染建筑废物对Zn的平衡吸附量从7.1mg/g大幅降至0.15mg/g,而对Pb、Cr(Ⅲ)和Cd的吸附量先增加后降低。结合吸附特征,围绕建筑废物-土壤体系开展了25mm/h的降雨模拟试验,农药污染废物累计洗脱量幂函数拟合较好,对于与农药接触时间为1d和7d的建筑废物试验批次,拟合的相关系数R^2分别为0.95和0.91,一级动力学平均耗散速率常数Kw表明,污染物在废物表面的停留时间与水流迁移相关性较小。The adsorption mechanisms of typical organic pesticide pollutants and combined pollutants of heavy metals and organic pesticide on construction waste surface were investigated.The adsorption capacity of pesticide pollutants on brick powder varied from 0.02 mg/g to 0.2 mg/g with an equilibrium time of around 45 min.The adsorption capacity was negatively correlated with the specific surface area and hydrophilicity of the wastes.The adsorption process of heavy metals on pesticide contaminated construction wastes was complicated,mainly due to the presence of flocculent organic matters and crystal heavy metals.Compared with the uncontaminated construction wastes,the adsorption capacity of Zn on phorate and O,O'-diethyl dithiophosphate contaminated wastes greatly decreased from 7.1 mg/g to 0.15 mg/g,while that of Pb,Cr(Ⅲ) and Cd increased first and then decreased,with the increasing level of organic pesticide pollution.Under the simulated rainfall of 25 mm/h for the construction waste-soil system,the cumulative wash-off amount of pesticide pollutants fitted well with the power function curve,of which the correlation coefficients R^2 were 0.95 and 0.91 for construction waste samples contaminated by pesticide for 1 d and 7 d,respectively.Wash-off amount of pesticide pollutants showed little correlation with contamination contact time according to the average dissipation rate constant of first-order kinetic equation (Kw).
分 类 号:X53[环境科学与工程—环境工程]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.249