石油化工企业原址土壤修复过程中废气治理案例研究

以位于我国北方某石油化工企业为例,对企业关停搬迁后的原址土壤修复技术方案进行分析,研究了土壤修复过程中的废气治理问题.原址土壤中苯、甲苯、乙苯、对二甲苯、间二甲苯、邻二甲苯、苯乙烯、苯酚、总石油烃(C10～C40)等多项污染物含量超标.对地表以下4～14.5 m土层的污染土壤,主要采用原位多相抽提和曝气技术、化学氧化技...

CASE STUDY OF THE EXHAUST GAS TREATMENT DURING SOIL REMEDIATION AT THE ORIGINAL SITES OF PETROCHEMICAL ENTERPRISES

Taking a petrochemical enterprise located in the north of China as an example, this paper analyzed the problem of the waste gas treatment in the process of on-site soil remediation. In the soil, benzene, toluene, ethylbenzene, p-xylene, m-xylene, o-xylene, styrene, phenol, total petroleum hydrocarbons (C₁₀—C₄₀) and other pollutants exceeded the limits in national standard. In-situ multi-phase extraction, aeration technology and chemical oxidation technology were mainly used to treat the contaminated soil in the 4-14.5 m soil layer below the surface. In this process, it was necessary to ensure that the whole soil and groundwater pollution area was well sealed, and activated carbon was used to adsorb volatile organic compounds in tail gas. For the polluted soil 0-4 m below the surface, the exhaust gas from the membrane greenhouse was collected by the gas collector and then sent to the tail gas treatment device. The exhaust gas from the process of ectopic thermal desorption finally entered the two-stage activated carbon adsorption system, and the organic waste gas was absorbed by the activated carbon and then detected by the on-line monitoring device before emission.