Assessment of Soil Enzyme Activities in TPH-Contaminated Soil after Soil Washing and Landfarming Application

초록

Soil washing and landfarming processes are mainly used to remediate total petroleum hydrocarbon (TPH)contaminated soil, but the effect of these remediation processes on soil enzyme activity is not well known. Soil enzymes catalyze biochemical reactions in the soil and play a very important role in the circulation ofnutrients. In addition, soil enzyme activity is widely used as a biological indicator of soil quality. Four groups(non-contaminated soil, TPH contaminated soil, after soil washing, and landfarming soil) were collected toassess chemical properties and soil enzyme activity. As a result, TPH decreased the arylsulfatase and ureaseactivity, and the soil remediation process can recover soil enzyme activities. Arylsulfatase activity slightlyincreased after the soil washing and landfarming process. However, urease activity increased significantlyafter landfarming. In contrast, beta-glucosidase activity did not change after the soil remediation processes. Inconclusion, it suggests that the measurement of soil enzyme activity in TPH-contaminated and remediatedsoils can enable a comprehensive evaluation of soil quality.

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