基于电子鼻土壤与地下水污染修复现场TVOC和恶臭的评估

根据上海某土壤与地下水污染修复现场情况,应用自主研发的电子鼻系统(iSA-M1)分别对未修复及修复过程中的土壤和地下水、修复场地上空及周边空气中的VOCs和恶臭类气体进行检测.结合前期研究所得TPI和OPI公式,求得各点的值,并将其用图表示.结果表明:①修复后TVOC和恶臭的浓度总体呈下降趋势;②在土壤和地下水修复过程中,VOCs和恶臭的挥发受气象要素和作业的影响,其浓度在总体下降的过程中伴随着阶段性上升现象;③结合GIS技术,电子鼻能初步用于评估土壤和地下水修复现场造成的空间污染情况及对周围居民产生的影响.但造成影响程度的具体细化分级还需要进一步研究.

Assessment of TVOC and Odor in the Remediation Site of Contaminated Soil and Groundwater Using Electronic Nose

According to the conditions of a contaminated soil and groundwater remediation site in Shanghai, the self-built electronic nose was applied to detect VOCs and odor of previously remedied soil and groundwater, remedying soil and groundwater, and the air above and around the site. Combining the formula of TPI and OPI, the value of each point was got and was shown in figures. Results showed: 1 Comparing the determination results of previously remedied with remedying contaminated soil and groundwater, the concentration of TVOC and odor was overall declined. The result was consistent with the fact. The detection result of electronic nose was proved to be right; 2 In the remediation process of soil and groundwater, the volatilization of VOCs and odor was inflected by temperature and works of crushing, adding medicine and turning the soil on time. The concentration showed a trend of overall decline with stage rising, so the electronic noses can be used for dynamic monitoring of the whole remediation process; 3 Combined with the GIS, the electronic noses can preliminary assess space pollution situation caused by the remediation of contaminated soil and groundwater and the influence on the residence in the surrounding region. However, further study on the refined classification of the impact degree is needed.