机械球磨固化修复六价铬污染土壤  

Solidification and Remediation of Hexavalent Chromium Spiked Soil Using Mechanical Ball Milling Treatment

作　　者：许维通 苑文仪[2] 李培中 张紫薇 王晓岩[1] 王临才[2] 白建峰[2] 王景伟[2] XU Weitong;YUAN Wenyi;LI Peizhong;ZHANG Ziwei;WANG Xiaoyan;WANG Lincai;BAI Jianfeng;WANG Jingwei(School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai 201209, China;WEEE Research Centre, Shanghai Polytechnic University, Shanghai 201209, China;Beijing Key Laboratory of Industrial Land Contamination and Remediation, Environmental Protection Research Institute of Light Industry, Beijing 100089, China)

机构地区：[1]上海第二工业大学环境与材料工程学院,上海201209 [2]上海第二工业大学电子废物研究中心,上海201209 [3]北京轻工业环境保护研究所工业场地污染与修复北京市重点实验室,北京100089

出　　处：《环境科学与技术》2019年第4期155-160,共6页Environmental Science & Technology

基　　金：国家自然科学基金(21876106);上海第二工业大学校基金(A01GY18EX04;A01GY18F022-d02);上海第二工业大学学科建设(XXKZD1602)

摘　　要：采用机械球磨法对六价铬污染土壤进行固化处理,文章研究了不同球磨工艺参数对降低土壤中六价铬浸出浓度的影响;同时,在球磨时间2 h、球磨转速500 r/min、球料比12的特定条件下,对8组不同浓度梯度的六价铬污染土壤进行球磨处理,探究机械球磨对不同污染强度土壤的固化效果。结果表明,随着球磨条件逐渐增强,土壤中六价铬浸出浓度随之减少。当保持球磨转速500r/min、球料比12不变,延长球磨时间至6 h时,六价铬浸出浓度由原始的453.16 mg/L降低至0.29 mg/L,低于固体废物浸出毒性浸出标准限定值(5 mg/L),固化率达到99.93%。而机械球磨对土壤中六价铬的固化能力是有限的,当在处理高浓度六价铬污染土壤时,则需要进一步增强球磨条件才能使六价铬的浸出浓度满足毒性浸出标准。Effects of various parameters in ball milling process on Cr(Ⅵ) leaching concentration were studied in details with solidification of Cr(Ⅵ) spiked soil. At the same time, under conditions of milling time 2 h, milling speed 500 r/min, ball to powder ratio(BPR) 12, 8 groups of Cr(Ⅵ) concentration gradient were researched for the investigation of the objective of solidification effectiveness. Results showed that Cr(Ⅵ) leaching concentrations decreased as the ball milling conditions increased. Cr(Ⅵ) leaching concentration decreased from 453.16 mg/L to 0.29 mg/L(lower than the regulatory limit of 5 mg/L)with solidification ratio of 99.93% by keeping milling speed 500 r/min, BPR constant 12 while prolonging milling time to 6 h.However, the solidification capacity of mechanical ball milling is limited, only further increase ball milling conditions can achieve the goal of decreasing Cr(Ⅵ) leaching concentration to regulatory threshold when it applied to high strength Cr(Ⅵ)contaminated soil.

关 键 词：六价铬 土壤修复 机械球磨 固化 

分 类 号：X53[环境科学与工程—环境工程]