以某化工廠污染場地為例，根據(jù)《污染場地風險評估技術導則》（HJ 25．3－2014），運用 HERA 風險評估軟件，將污染場地分為4層分別進行人體健康風險評估，結果表明：該場地存在高致癌風險，需要修復后才能開發(fā)再利用；關注污染物氯仿、苯，在地下0 m ～3 m 的風險控制值分別為0．07 mg ／kg、0．83 mg ／kg，在地下3 m ～5 m 的風險控制值分別為0．15 mg ／kg、1．91 mg ／kg，在地下5 m ～9 m 的風險控制值分別為0．40 mg ／kg、5．05 mg ／kg，在地下9 m ～18 m 的風險控制值分別為0．73 mg ／kg、7．82 mg ／kg。與以往計算單一的風險控制相比，分層計算污染物的風險控制值能有效減少治理土方量，降低治理成本。%Taking a chemical plant as an example,according to the guideline of contaminated sites risk as-sessment technology (HJ 25.3 -201 4),the pollution area was divided into four levels to carry on the layered human health risk assessment by HERA software.The results showed that the ground there is high risk of canc-er,and contaminated soil needs to be repaired before development and reutilization.As for the pollutants chloro-form and benzene,the risk control targets were 0.07 mg /kg and 0.83 mg /kg for 0 m to 3 m under the ground, 0.1 5 mg /kg and 1 .91 mg /kg for 3 m to 5 m under the ground,0.40 mg /kg and 5.05 mg /kg for 5 m to 9 m un-der the ground,and 0.73 mg /kg and 7.82 mg /kg for 9 m to 1 8 m under the ground,respectively.Compared with the single risk calculation,the layered risk calculation method can reduce both the repairing earthwork quantity and the repairing cost.
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