Application of compost tea to soil washing for diesel contaminated soil treatment

• Main Authors: Fan,Sheng-Huan, 范勝洹
• Other Authors: Chitsan Lin
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/19504281564973577996

碩士 === 國立高雄海洋科技大學 === 海洋環境工程研究所 === 102 === Mature compost made from food waste composting process is known to contain abundant humic acid (HS). Humic acid are water soluble and know to exhibit surfactant properties which can result in micelle effects. Therefore compost tea made from mature food waste compost should be rich in humic acid and should have potential to replace chemical surfactant in soil washing applications. This research is aimed at using compost tea to soil washing for diesel contaminated soil. In a simulated diesel contaminated fine sand example, by using compost tea with 0.1% humic substance concentration, 60% of removal efficiency (RE) can be achieved while only 40% RE for that of using water. When comparing compost tea versus commercial surfactants, the washing RE for compost tea was 62.54%; and were 60.79%, 56.65%, 58.18% for that of Triton, SDS and APG. Our preliminary results have indicated (1) compost tea is an effective washing fluid in both diesel contaminated fine sand and clay soil matrix; (2) compost tea is as effective as or better than the commercial surfactants tested; (3) when dealing with diesel contaminated clay soil, an extended washing time is required with adequate mixing operation. Finally, it is worth to mention that compost tea is also a compost tea with natural organic humic acid and abundant in nutrients. If the proposed compost tea can eventually replace chemical surfactants in diesel contaminated soil washing, a green and sustainable remediation technology can be expected.