重金属污染土壤微波玻璃化技术研究  

STUDY ON MICROWAVE VITRIFICATION TECHNOLOGY OF HEAVY METAL CONTAMINATED SOIL

作　　者：王贝贝[1] 朱湖地[1] 陈静[1] 

机构地区：[1]华中科技大学环境科学研究所,武汉430074

出　　处：《环境工程》2013年第2期96-98,108,共4页Environmental Engineering

基　　金：国家高技术研究发展计划(863计划)(2012AA06A304);华中科技大学自主创新研究基金(2012QN126;2011TS064)

摘　　要：采用微波技术对土壤中Cd进行玻璃化固定研究,考察了微波辐照功率、助熔剂硼砂和微波敏化剂活性炭对玻璃化效果的影响。结果表明:延长辐照时间和增大微波功率,土壤外观发生明显团聚结晶的玻璃化现象,Cd的固定率显著升高。微波(539 W)辐照5 min,Cd的固定率可达95%以上。硼砂可显著降低土样的熔融温度,从而缩短微波时间,降低能耗。添加活性炭显著提高Cd的固定率而粒径对Cd的固定率影响不显著。微波作用形成的玻璃体结构致密结实,Cd的浸出浓度满足国家标准限值,使得污染土壤资源化的实现具有一定的可行性。The vitrification of the heavy metal （Cd） in soil by microwave heating technology was studied, and the factors influencing vitrification effect were investigated in this article. The results showed that as microwave irradiation time and power increased, the soil gradually aggregated, crystallized and appeared vitrification phenomenon, and therefore Cd immobilization efficiency increased significantly. Exposure to the microwave power of 539 W, Cd immobilization efficiency reached 95% in 5 min. Adding some borax into the soil could decrease the fusion temperature significantly, which sequentially shortened microwave irradiation time and saved energy consumption. Positive effect of the addition quantity of active carbon was remarkable while its size had little impact. In addition, structure of the vitrification formed from microwave irradiation was very firm and dense and the Cd leaching concentration in the vitrification met the limit of national standard, so it is feasible to realize the contaminated soil resource.

关 键 词：微波 土壤 CD 玻璃化 助熔剂 

分 类 号：X53[环境科学与工程—环境工程]