Phytoremediation of Diesel Contaminated Soils by Ryegrass (Lolium perenne L.) and Tall Fescue (Festuca arundinacea)

• Main Authors: Li-Jia Hong, 洪苙嘉
• Other Authors: Shui-Wen Chang Chien
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/80890753659721760619

碩士 === 朝陽科技大學 === 環境工程與管理系 === 102 === Phytoremediation is a method used to handle the organic pollutants effectively and friendly. This study simulated the ground storage tank breaking and diesel oil leaked in soil. It uses the red soil, alluvial and quartz (contrast) as contaminant soil amended with or without compost (5%) and place in glass case as the model (15×15×25 cm). The model soil divided in to nine components in horizon, and parted top, middle and bottom layer in depth. It was added the concentration of 10000 mg kg-1 (TPH) of diesel in the core of model. It was disperse in soil and cause 27 different concentrations of samples. The model used ryegrass and tall fescue as the plant of phytoremediation. After the model planted grass period of 60 days. In the soil without compost treatment, ryegrass and tall fescue plant diesel concentration involve the range of 0.01-0.86 in shoot, and 0.01-0.96 in root. Without compost treatment in soil, the range was 0.04-0.88 in shoot, and 0.01-1.79 in root. It cause the bioconcentration was 0.00001-0.00028 in shoot and 0.00001-0.0024 in root without compost treatment. With compost treatment was promoted to 0.00024-0.00028, but demoted to 0.00004-0.0006. Without compost treatment and unplanted of diesel contaminant soil degradation was 5-20%, the soil microbial population was 1×103-2×105 CFU g-1, and the root of soluble vanillic acid concentration was 0.06-0.6 μg vanillic acid g-1 dry soil. The endophyte in tall fascue was more stronger than ryegrass.Limit in acid and non-nutrient environment.It’s benefit toendophyte to grow efficiency with compost treatment.The nature degradation only between 5-20%.Without compost treatment but plant the grasses promoted to 10-50% of degradation, the soil microbial population was 4×103-4.2×105 CFU g-1 , and the root of soluble vanillic acid concentration was 0.13-0.35 μg vanillic acid g-1 dry soil. With compost treatment and plant promoted to 30-80%, the soil microbial population was 6×103-8.8×105 CFU g-1 , and the root of soluble vanillic acid concentration was 1.5-7.5 μg vanillic acid g-1 dry soil. The results indicate that plant ryegrass and tall fescue can degrade the diesel contaminant soil significant. Tall fescue is better than ryegrass of tolerance, and plant mass of tall fescue was higher. The phytoaccumulation was not significant than rhizosphere and caused bioconcentration factor was limit. With compost treatment can increase the diesel contaminant soil degradation, soil microbial population and the root of soluble vanillic acid concentration. The same result was happened in the group of soil type. It was the best of alluvial and red soil was better than quartz.