摘要
Volatile organic compounds(VOCs) are widely used in various industrial processes and generate water pollutions.VOCs removal from raw water is an important task for waterworks to guarantee drinking water security.The removal of VOCs such as chlorobenzene(CB) and ethylbenzene(EB) from raw water by air stripping was investigated under various conditions,including the variation of temperature(5-30℃),pH(3.5-10.5),and air/water ratio(10-60).The air stripping removal efficiency of VOCs decreased with VOCs concentration declining in water.And Henry's law constant was demonstrated as an indicator of the estimation of VOCs removal efficiency for air stripping.The effects of temperature and the ratio of air and water were found to play a great role in VOCs removal,but the effect of pH seemed to be negligible.This study demonstrates that air stripping provides a promising opportunity in removing VOCs in drinking water treatment,especially for the relatively high concentration of VOCs.
Volatile organic compounds （VOCs） are widely used in various industrial processes and generate water pollutions. VOCs removal from raw water is an important task for waterworks to guarantee drinking water security. The removal of VOCs such as chlorobenzene （CB） and ethylbenzene （EB） from raw water by air stripping was investigated under various conditions, inciuding the variation of temperature （5-30~C）, pH （3.5-10.5）, and air/water ratio （10-60）. The air stripping removal efficiency of VOCs decreased with VOCs concentration declining in water. And Henry＇s law constant was demonstrated as an indicator of the estimation of VOCs removal efficiency for air stripping. The effects of temperature and the ratio of air and water were found to play a great role in VOCs removal, but the effect of pH seemed to be negligible. This study demonstrates that air stripping provides a promising opportunity in removing VOCs in drinking water treatment, especially for the relatively high concentration of VOCs.
基金
National High Technology Research and Development Program of China(863 program)(No.2008AA06A414)
Major Science and Technology Proyran for Water Pollution Control and Treatment,China(No.2008ZX07421-003)
