基于嗅觉效应的土壤修复目标值确定及修复实践——以上海某糖精化工厂为例  

Determination of soil remediation target values and remediation practices based on olfactory effects:a case study of a saccharin chemical plant in Shanghai

作　　者：崔航 CUI Hang(Shanghai Yaxin City Construction Co.,Ltd.;Technology Innovation Center for Land Spatial Eco-Restoration in Metropolitan Area,Ministry of Natural Resources)

机构地区：[1]上海亚新城市建设有限公司 [2]自然资源部大都市区国土空间生态修复工程技术创新中心

出　　处：《环境工程技术学报》2025年第2期663-670,共8页Journal of Environmental Engineering Technology

基　　金：上海市地矿工程勘察(集团)有限公司科研项目(Dkjt202213)。

摘　　要：由于缺乏相关技术标准和规范,土壤异味识别评估和修复管控工作尚缺乏系统的方法支撑和实践验证。以上海某糖精化工厂地块为例,通过识别异味物质、制定基于嗅觉效应的土壤修复目标值、开展土壤异味修复等来论证异味控制目标制定的合理性以及修复技术的有效性。通过生产工艺分析和采样检测两方面识别地块土壤中产生异味的物质,主要包括甲苯、2-氯甲苯、4-氯甲苯、氨氮等。结合污染物在空气中的嗅阈值与土壤挥发因子模型推导基于嗅觉效应的土壤修复目标值,计算出甲苯、2-氯甲苯、4-氯甲苯、氨氮对应的修复目标值分别为162.14、492.28、492.28、164.00 mg/kg。采用热脱附技术设定加热温度250℃,加热时间30 min,可将异味物质浓度降低至修复目标值以下,对应臭气强度检测结果为2级,即达到异味可接受水平。该研究结果可为土壤异味识别评估和修复提供方法支撑与经验参考。Due to the lack of relevant technical standards and specifications,systematic method support and practical verification are still insufficient for soil odor identification,evaluation,and restoration management.Taking a saccharin chemical plant site as an example,we demonstrate the rationality of odor control target setting and the effectiveness of restoration techniques by identifying odor substances,setting soil restoration target values based on olfactory effects,and conducting soil odor restoration.Through production process analysis and sampling testing,the substances causing odor in the soil of the plot were identified,mainly including toluene,2-chlorotoluene,4-chlorotoluene,and ammonia nitrogen.Based on the odor threshold values of pollutants in the air and the soil volatilization factor model,the soil restoration target values based on olfactory effects were derived,and the corresponding restoration target values for toluene,2-chlorotoluene,4-chlorotoluene,and ammonia nitrogen were calculated as 162.14,492.28,492.28,and 164.00 mg/kg.By using thermal desorption technology with a heating temperature of 250℃and a heating time of 30 minutes,the concentration of odor substances could be reduced to below the restoration target value,and the corresponding odor intensity test result was grade 2,indicating that it had reached an acceptable odor level.The results of this study can provide methodological support and empirical reference for soil odor identification,evaluation,and restoration.

关 键 词：土壤异味修复 嗅觉效应 挥发因子模型 氨氮 臭气强度 

分 类 号：X53[环境科学与工程—环境工程]