Application of the Ozonation Pre-treatment for Biodegradation of Aqueous Solutions of Methyltert-Butyl Ether | Science Publications

American Journal of Environmental Sciences

A. Mesdaghinia¹  A. Khavanin¹  A. Badkoubi¹  M. Sadeghi¹  R. Nabizadeh¹ 

关键词: Methyltert-Butyl Ether (MTBE);    Ozonation;    Pre-treatment;    Biodegradability;   

DOI  :  10.3844/ajessp.2005.41.45

学科分类：环境科学（综合）

来源: Science Publications

【 摘 要 】

The effectiveness of ozone treatment for improving the biodegradability of recalcitrantpollutants has been proved by investigating the ozonation reaction of Methyl tert-butyl ether (MTBE) abioresistant gasoline oxygenate. Laboratory scale experiments have been carried out, at roomtemperature, by bubbling, for 120 min, ozonated air (3.4 ppm min^-1 ) into 3 liter of an alkaline(pH=11.5) aqueous solution (100 mg L^-1) of MTBE. The experimental results indicated that during theozonation, complete MTBE degradation occurs in 100 min and after this time, ozoneconsumption goes on very slowly. At the end of the ozonation, after 100 min, the initial value of COD(256 mg O₂ L^-1) is 98 and correspond to a relative removal of about 62%.As for MTBE solutionbiodegradability expressed as (BOD5)/(COD) ratio, during the first 90 min its value regularly increasesfrom lowest (0.01) up to a maximum of 0.68 that corresponds to an ozone consumption of 1.25 mg pereach mg of COD initially present in the solution.The experimental results for determining the rate ofMTBE removal due to stripping showed that about 14% of MTBE strips out after an hour of spargingwith oxygen gas. The fraction of MTBE oxidized and/or striped increases to about 28% (in pH=7) and70% (in pH=11.5) with ozonation over the same time period.

【 授权许可】

Unknown