问题描述：
英语翻译
The experiences in Europe have demonstrated that biofiltration has economic and other advantages over existing APC technologies,particularly if applied to off-gas streams that contain only low concentration(typically less than 1000 ppm as methane) of air pollutants that are easily biodegraded.
The experiences in Europe have demonstrated that biofiltration has economic and other advantages over existing APC technologies,particularly if applied to off-gas streams that contain only low concentration(typically less than 1000 ppm as methane) of air pollutants that are easily biodegraded.
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