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以某废弃有机氯农药厂污染场地的修复过程为对象,应用被动空气采样技术研究了挖掘扰动对污染场地及周边区域空气中ρ(HCHs)(HCHs为六六六)、ρ(DDTs)(DDTs为滴滴涕)分布的影响.结果表明:在挖掘扰动过程中污染场地及周边空气中ρ(HCHs)和ρ(DDTs)显著增加,其中污染场地挖掘区空气中ρ(HCHs)和ρ(DDTs)抬升最大,ρ(HCHs)为23.36~494.39 ng/m3,平均值为(141.54±114.54)ng/m3;ρ(DDTs)为14.78~539.09ng/m3,平均值为(201.69±143.88)ng/m3.居民区空气中ρ(HCHs)和ρ(DDTs)抬升最小,ρ(HCHs)为(4.36~29.00 ng/m3),平均值为(13.59±7.75)ng/m3;ρ(DDTs)为3.03~42.88 ng/m3,平均值为(13.37±11.53)ng/m3.挖掘扰动增强了空气流动,使空气中扬尘增加,从而改变了空气中污染物单体的组成比例,其中β-HCH、δ-HCH、o,p’-DDT、p,p’-DDT所占比例升高,而其余单体所占比例降低.空气中污染物ρ(HCHs)和ρ(DDTs)与温度呈正相关,与风速呈负相关.因此,在对该类污染场地修复过程中,应该尽量避免在高温或强对流气候条件下挖掘施工,施工时应减少扬尘,以降低二次污染风险.
Taking the recovery process of contaminated sites in a given organochlorine pesticide plant as an example, the application of passive air sampling techniques to study the effects of excavated disturbances on the air ρ (HCHs), HCHs (HCHs), (DDTs) (DDTs) (HCHs) and ρ (DDTs) in contaminated sites and surrounding air during excavation disturbances were significantly increased, of which ρ (HCHs) and ρ (DDTs) were uplifted in the air of the excavation sites (HCHs) was 23.36 ~ 494.39 ng / m3 with an average of (141.54 ± 114.54) ng / m3; ρ (DDTs) was 14.78 ~ 539.09ng / m3 with an average of (201.69 ± 143.88) ng / m3. The air ρ (HCHs) and ρ (DDTs) uplift in the residential area were the smallest, and the ρ (HCHs) was (4.36 ~ 29.00 ng / m 3) with an average of (13.59 ± 7.75) ng / m 3 and the DDTs were 3.03 ~ 42.88 m3, with an average value of (13.37 ± 11.53) ng / m3. Excavation disturbances enhanced air flow and increased dust in the air, thus changing the compositional ratio of air pollutants. Among them, β-HCH, , The proportion of o, p’-DDT, p, p’-DDT increased, while the proportion of other monomers decreased.Hair pollutants ρ (HCHs) and ρ (DDTs) were positively correlated with temperature, Therefore, in the negative In the process of remediation of contaminated sites, we should try to avoid excavation under high temperature or strong convective climatic conditions, and reduce dust during construction so as to reduce the risk of secondary pollution.