摘要
生物通风法被广泛应用于不饱和土壤中挥发性有机物的去除,具有高效、费用低等优点。以黄壤为实验土样,柴油为污染物,采用室内一维土柱实验模拟生物通风过程,研究了抽提和注入两种通风方式下柴油的去除效果及规律。结果表明,两种通风方式的去除规律大致相同,抽提方式的去除速度要比注入快,但最终去除率仅比注入高2.28%;每日通风前后及通风过程中测定的土柱总出气口中总挥发性有机化合物(TVOC)值的变化规律也基本相同,只是通风后TVOC值相对较高;在一天8h的通风过程中,每隔1,2,3h测定的TVOC值波动变化的程度为TVOC1h>TVOC2h>TVOC3h;土壤中有效磷和速效氮的含量与柴油生物降解效率密切相关。
Bioventing has been effectively used for removal of volatile organic compounds from unsaturated soil due to its high efficiency and low treatment cost. An experiment was conducted in laboratory using diesel as a model contaminant and one dimensional porous column filled with yellowish soil. The removal effect and its process using the two ventilation methods of pumping and injecting were studied. Results showed that pumping and injecting had the same removal process. The removal rate by pumping was faster than injecting, but the remediation efficiency was only 2.28% higher than injecting. The total volatile organic compounds （TVOC） of tail gas before and after ventilation also had the same changing process, but the value after venti- lation was relatively higher. The TVOC was determined every 1, 2 and 3 h one clay in the 8 h ventilation, and the fluctuating degree of TVOC was showed as the order of TVOQ h 〉TVOC2 h TVOC3 h. Available phosphorus and effective nitrogen were highly related to the diesel biodegradation efficiency in the soil.
出处
《水土保持通报》
CSCD
北大核心
2013年第5期15-18,28,共5页
Bulletin of Soil and Water Conservation
基金
国家高技术研究发展计划项目"挥发性有机物污染场地土壤气提修复技术与设备研发与示范"(SQ2009AA06XK1482462)
环保公益型科研专项"区域物质流分析与管理在循环经济发展模式中的应用研究"(201009063)
环保公益项目"农村人居环境综合整治关键技术集成与配套政策研究"(201109024)
关键词
生物通风
通风方式
柴油污染
土柱
bioventing
ventilation method
diesel contamination
soil olumn
