本文關(guān)鍵詞：VOCs污染場地風(fēng)險管理策略的篩選及評估，由筆耕文化傳播整理發(fā)布。

VOCs污染場地風(fēng)險管理策略的篩選及評估

Screening and Evaluation of Risk Management Strategies for a Site Contaminated by VOCs

[1] [2] [3] [4] [5] [6] [7]

ZHONG Maosheng, JIANG Lin, ZHANG Lina, XIA Tianxiang , HAN Dan, YAO Juejun , ZHENG Di（ 1. Beijing Municipal Research Institute of Environmental Protection, National Engine

[1]北京市環(huán)境保護科學(xué)研究院,國家城市環(huán)境污染控制工程技術(shù)研究中心,北京100037; [2]北京市環(huán)境保護科學(xué)研究院,污染場地風(fēng)險模擬與修復(fù)北京市重點實驗室,北京100037; [3]北京市固體和化學(xué)品管理中心,北京100089

文章摘要：以某VOCs（volatile organic compounds,揮發(fā)性有機化合物）污染場地為例,結(jié)合實地調(diào)查,將健康風(fēng)險評估用于場地風(fēng)險管理策略的篩選.結(jié)果表明：1該場地不同深度土壤均受到氯仿、二氯甲烷和苯的污染,污染物垂向遷移特征明顯,最大遷移深度達25.8 m,其中深度≤15.0 m的土壤污染較重.2基于保守的通用場地概念模型對將其規(guī)劃為居住用地時的健康風(fēng)險進行評估顯示,氯仿、二氯甲烷和苯的致癌風(fēng)險分別達6.0×10^-2、2.9×10^-4、7.4×10^-5,均超過可接受風(fēng)險水平（1.0×10^-6）,三者修復(fù)目標(biāo)分別為0.22、12.00和0.64 mg/kg.如采取策略一,即將場地內(nèi)超過修復(fù)目標(biāo)的土壤進行清除,需修復(fù)的土壤深度達24.0m,修復(fù)土方量為33.4×10^4m^3.3結(jié)合污染物垂向分布及場地未來地下空間開發(fā)規(guī)劃,提出策略二,即對0~15.0 m深度范圍內(nèi)重污染土壤進行清除異位修復(fù)、〉15 m深度范圍內(nèi)土壤采取工程控制措施.實施策略二后的風(fēng)險評估結(jié)果顯示,雖然〉15.0 m深度范圍內(nèi)土壤中依然存在w（氯仿）超過修復(fù)目標(biāo)的采樣點,但致癌風(fēng)險（8.3×10^-8）遠低于可接受水平;概率風(fēng)險評估顯示,該風(fēng)險值對應(yīng)的累計頻率為99.5%,考慮各參數(shù)取值的不確定性后,風(fēng)險模擬結(jié)果最大值也僅為1.06×10^-7.可見,策略二足夠保守,能夠保障未來居民的身體健康;與策略一相比,策略二可減少修復(fù)土方量6.4×10^4m^3,因此更具經(jīng)濟性,為風(fēng)險管理策略的優(yōu)選方案.

Abstr：Health risk assessment, in combination with contamination investigation, was applied in screening of risk management strategies for a site contaminated by VOCs. The results revealed that the soil was contaminated by chloroform, dichloromethane and benzene as deep as 25.8 m below ground level. Distinct changes in the vertical profiles of the three contaminants were observed ; the most contaminated soil was within the depth of 15.0 m. Health risk assessment was carried out based on the conservative generic conceptual model that the site would be redeveloped as a residential area. The assessment revealed that the carcinogenic risks of chloroform, dichloromethane and benzene were 6. 0 ×10^-2, 2.9 ×10^-4 and 7.4 ×10^-5, respectively, all far above the acceptable level of 1.0 ×10^-6. To meet the acceptable risk level, the corresponding remediation targets of the three contaminants were 0.22 mg/kg, 12.00 mg/kg and 0.64 mg/kg, respectively. If the removal of all contaminated soil exceeding the remediation targets （Strategy One） was chosen as the risk management strategy for the site, soil as deep as 24. 0 m, with a total volume of 334,000 m^3 , should be remediated. By considering the vertical distributions of the three contaminants and basement development plans of future buildings,removal of heavy contaminated soil within 15.0 m depth in combination with engineering control measures on the remaining contaminated soil was another potential alternative strategy （ Strategy Two）. The risk assessment of Strategy Two revealed that the residual health risk of chloroform was 8.3×10^-8, even though concentrations of some samples below 15.0 m were still above the remediation targets derived in Strategy One. Further probabi

文章關(guān)鍵詞：

Keyword：:risk assessment VOCs contaminated site management strategies site conceptual model probabilistic risk assessment

課題項目：國家環(huán)境保護公益性行業(yè)科研專項（201409047）; 北京市科學(xué)技術(shù)委員會重大項目（D08040000360000）

  本文關(guān)鍵詞：VOCs污染場地風(fēng)險管理策略的篩選及評估，，由筆耕文化傳播整理發(fā)布。