焦化类污染场地原位热脱附修复效果试验

针对苯和多环芳烃污染的焦化类污染场地,开展原位燃气热脱附试验.创新性地将燃烧和抽提结合,通过加入小抽提管设计形式,将有机污染气体二次回燃的处置效果和能源消耗达到最佳状态,在尾气、尾水模块化设计中采用了"二次燃烧+活性炭吸附"和"油水分离+活性炭"的组合工艺,既强化了有机污染物去除效果,又降低了废气活性炭产生量.通过在1...

EXPERIMENTAL STUDY ON RESTORATION EFFECT OF IN SITU THERMAL DESORPTION IN COKING CONTAMINATED SITES

In-situ gas thermal desorption experiments were conducted on coking sites contaminated by benzene and PAHs. In this paper, the disposal effect and energy consumption of the secondary combustion of organic pollutants reached an optimal state by innovatively combining combustion and extraction and means of the design form with small extraction tube. In the modular design of tail gas and tail water, the combined process of secondary combustion and adsorption of activated carbon, as well as oil-water separation and activated carbon was adopted, thereby enhancing the removal effect of organic pollutants, and reducing the production of waste gas and activated carbon. Through the remediation experiments conducted on a coking contaminated site of 100 square meters, the four heating periods in the thermal desorption process were well-defined, and the remediation duration was about 55 days. After remediation, the concentrations of benzo (a) pyrene and benzene were less than the standard values for screening the second type land according to Soil Environment Quality Risk Control Standard for Soil Contamination of Development Land (GB 36600-2018), and the exhaust emissions conformed to the Comprehensive Emission Standard of Air Pollutants of Beijing (DB 11/501-2017).