In Situ Bioremediation of Ground Water Contaminated with Petroleum Hydrocarbons

• Main Authors: Chuang, Shun, 莊順
• Other Authors: Kuo Wen-Chien
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/mh335a

碩士 === 國立屏東技術學院 === 環境工程技術研究所 === 85 === The objective of this study is to develop an upflow biofilter in combination with a leaching system treating groundwater and soil contaminated with petroleum hydrocarbons simultaneously, and enhancing the efficiency of in situ bioremediation. In the preliminary studies, results tested by respirometer showed over 80% of 104mg/L BTEX(Benzene, Toluene, Ethylbenzene, and Xylene)was biodegraded in 142 hours at 20C under aerobic conditions. Under the same temperature, over 98% of a solution containing 12mg/L BTEX was biodegraded in 169 hours with the addition of 50mg/L H2O2. An abiotic test showed that 11mg/L of BTEX was not transformed at all by chemical reaction with the addition of 333mg/L H2O2 under 20C and 100rpm shaking for 36 hours. In this study, a reducing agent, Na2SO3 was used to help maintain the DO<0.2mg/L for anaerobic conditions. In an experiment to test if the addition of a 700mg/L of Na2SO3 would have impact upon the microorganisms, it was found that over 98% of a 10mg/L BTEX was degraded under 20C for 15 days anaerobically, with or without adding 700mg/L Na2SO3. The results of laboratory-scaled upflow biofilter system experiments evidenced that, over 98% of a solution containing 13mg/L BTEX was biodegraded with HRT( Hydraic Retention Time)=1 hour and adding of H2O2=33mg/L in 240 minutes. It was also found that the efficiency was maintainable in a lower HRT of 0.5 hour. Furthermore, the soil leaching experiment was tested with three different leachates(from distilled water, effluent from an aerobic upflow biofilter , and effluent from an anaerobic upflow biofilter , respectively). The calculated result of mass balance showed that it would take only about 65 days to remedy soil contaminated with BTEX (4000mg/kg dry soil) by leaching with effluent from the aerobic upflow biofilter. With the results showed from these studies, feasibility of developing an upflow biofilter system treating groundwater and soil contaminated with petroleum hydrocarbons simultaneously was demonstrated.