淋洗剂HPAA和FA对土壤重金属的去除和淋洗废液吸附研究  

A study on removal of heavy metals from soil by eluents HPAA,FA and adsorption of leaching waste liquid

作　　者：戴胜伟 王方园 王磊 申艳冰 张宁 DAI Shengwei;WANG Fangyuan;WANG Lei;SHEN Yanbing;ZHANG Ning(College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua 321004,China)

机构地区：[1]浙江师范大学地理与环境科学学院,浙江金华321004

出　　处：《浙江师范大学学报（自然科学版）》2022年第2期202-209,共8页Journal of Zhejiang Normal University:Natural Sciences

基　　金：国家自然科学基金资助项目(22076171);浙江省五水共治办、市生态环境局专项课题(KYH06Y19047)。

摘　　要：采用2-羟基膦酰基乙酸(HPAA)和富里酸(FA)2种环境友好型淋洗剂对土壤进行异位淋洗处理,研究了淋洗剂质量分数、pH和淋洗时间对土壤Cu,Zn,Cd的去除效果及淋洗前后土壤重金属赋存形态的变化,并利用废弃果壳处理淋洗废液.结果表明:在质量分数为2.0%,pH为3,超声淋洗时间为40 min条件下,HPAA对Cd,Cu,Zn均可取得90%以上去除效果,HPAA对Cd,Cu,Zn的去除效果明显优于FA;2种淋洗剂的淋洗过程为化学淋洗,其结果符合准二级动力学方程(R^(2):0.9986~0.9999);2种淋洗剂均可有效促进重金属从不活泼态转变为活泼态;淋洗废液处理中,天然山竹壳(Man)对Cd,Cu,Zn的吸附效率均低于30%,而KMnO_(4)改性山竹壳(Mn-Man)吸附效果显著,最高分别可达93.12%,36.31%和51.87%.因此,HPAA可作为一种绿色高效的淋洗剂应用于重金属污染土壤的修复,Mn-Man可以作为一种廉价高效的吸附剂处理淋洗废液.Ectopic leaching of soil was carried out with 2-hydroxyphosphonoacetic acid(HPAA)and fulvic acid(FA).The removal effects of eluent mass fraction,pH and leaching time on soil heavy metals(Cu,Zn,Cd)and the changes of occurrence forms of heavy metals in soil before and after leaching were studied.Waste fruit shells were used to treat leaching waste.The results showed that when the mass fraction of HPAA was 2.0%and the pH value was 3 and the ultrasonic elution time was 40 min,the removal efficiency of Cd,Cu,Zn by HPAA was more than 90%.The removal effect of Cd,Cu,Zn by HPAA was obviously better than that of FA;The leaching process of two kinds of eluents was chemical leaching,and the results were in accordance with the quasi-second-order kinetic equation(R^(2):0.9986~0.9999).Both eluents effectively promoted the transformation of heavy metals from non-active state to active state;in the treatment of leaching waste,the adsorption efficiency of natural mangosteen shell(Man)to Cd,Cu,Zn was less than 30%,while the adsorption effect of KMnO_(4) modified mangosteen shell(Mn-Man)was significant,up to 93.12%,36.31%and 51.87%,respectively.Therefore,HPAA could be used as a green and efficient eluent in the remediation of heavy metal contaminated soil,and Mn-Man could be used as a cheap and efficient adsorbent to treat leaching waste.

关 键 词：异位淋洗 HPAA 富里酸 赋存形态 

分 类 号：X53[环境科学与工程—环境工程]