改性纳米铁原位反应带修复范围影响因素研究  

Study on influence factors of remediation area of in-situ reaction zone injected with modified nanoiron

作　　者：李卉[1] 赵勇胜[2] 韩占涛[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [2]吉林大学地下水资源与环境教育部重点实验室,吉林长春130021

出　　处：《中国环境科学》2015年第4期1135-1141,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(41272256);高等学校博士学科点专项科研基金(20130061110064)

摘　　要：为了解蔗糖改性纳米铁原位反应带在地下含水层中的形成规律,在二维模拟装置中创建原位反应带,研究了石英砂介质颗粒大小?地下水流速?浆液注入浓度?注入量及注入方式对反应带修复范围的影响.结果表明:反应带宽度随介质粒径及地下水流速的增加而增大,粗砂中反应带宽度约为细砂的3倍;当地下水流速由0.1m/d增加到1.0m/d时,反应带宽度分别增加了14.9%和106.4%.浆液分次注入的方式可使反应带初始宽度增加19.8%;较小的浆液浓度有利于反应带在水流方向和含水层垂向修复范围的扩展.In order to realize the formation rules of in-situ reaction zone（IRZ） of sucrose-modified nanoscale zero valent iron（SM-NZVI） in underground aquifer, simulated IRZ was set up in two-dimensional slot, and the influence of particle size of silica sand, groundwater velocity, slurry concentration, injection volume and injection approach on the remediation area of IRZ were invesgated. The results showed that the reaction zone was wider as the medium size and groundwater velocity increased, and the zone in coarse sand was 3times as wide as that in fine sand; when the groundwater velocity increased from 0.1m/d to 1.0m/d, the width expanded by 14.9% and 106.4%, respectively. Injecting slurry into underground gradually by several times could let the initial zone width increase by 19.8%. Moreover, lower slurry concentration contributed to the expansion of the zone in both directions of groundwater flow and vertical aquifer.

关 键 词：改性纳米铁 原位反应带 平均宽度 影响因素 

分 类 号：X523[环境科学与工程—环境工程]