几种覆盖材料抑制湖泊污染底泥氮释放的试验研究  

Experimental Study on Inhibiting Nitrogen Release from Contaminated Sediments by Several Capping Materials

作　　者：唐艳[1] 

机构地区：[1]湖北轻工职业技术学院,武汉430070

出　　处：《安全与环境工程》2012年第4期27-30,共4页Safety and Environmental Engineering

基　　金：国家高技术研究发展计划项目(2005AA60101005)

摘　　要：建立了一套模拟湖泊小试装置,分别采用含黏土的沙子、清洁黄土和土工布3种材料覆盖湖泊污染底泥,抑制底泥中的氮释放。试验控制在恒温25℃厌氧条件下进行,经过75d静置试验,结果表明:含黏土的沙子和清洁黄土均能有效抑制污染底泥的氮释放,而单独使用土工布的效果不佳;覆盖材料的覆盖厚度越厚,抑制污染底泥氮释放的效果越好;覆盖厚度为5cm、15cm和30cm的沙子对污染底泥氮释放的抑制率分别为74.9%、94.0%和96.8%,覆盖厚度为5cm、15cm和30cm的黄土对污染底泥氮释放的抑制率分别为77.2%、95.5%和98.8%,可见黄土的效果更优;从工程成本考虑,采用15cm覆盖厚度即可。A lab-scale simulation lake was built to study how to control nitrogen release from contaminated sediments.Sand-containing clay,clean loess and geotextile were placed on top of contaminated sediments respectively to inhibit nitrogen release.The temperature of lab-scale equipment was kept at 25℃.The contaminated sediments were under anaerobic conditions.The experiment lasted for 75 days.The results show that sand-containing clay and clean loess can greatly inhibit nitrogen release from contaminated sediments;however,the effects of geotextile are not good.The inhibition effects increase with the thickness of the cover.The inhibition ratios of nitrogen release from contaminated sediments are 74.9%（5 cm）,94.0%（15 cm） and 96.8%（30 cm） for sand,and 77.2%（5 cm）,95.5%（15 cm） and 98.8%（30 cm） for clean loess respectively.Therefore,the clean loess is the best of all three.Considering engineering cost control,the optimal thickness of loess layers is 5~15 cm.

关 键 词：湖泊 污染底泥 氮释放 覆盖材料 覆盖厚度 

分 类 号：X52[环境科学与工程—环境工程]