Recycling of remediated soil for effective composting of diesel-contaminated soil

Soil contaminated with diesel oil was remediated by the addition of remedia ted soil. Several mix ratios of contaminated soil to remediated soil were t ested. Judging from TPH degradation rate and biochemical parameters, the op timum mix ratio (wet weight basis) was 1:1. In this mix ratio, the first or der degradation rate constant of diesel oil based on TPH was 0.099/day. Deg radation rate of TPH and total amount of CO2 evolved in this condition were two times larger than those of contaminated soil without adding remediated soil. The addition of remediated soil was a very effective treatment optio n to facilitate the degradation rate of diesel oil in contaminated soil.