| 摘要 |
Air laden with biodegradable volatile organic compounds is passed sequentially through a first filter bed containing a biologically inert filter media, a second filter bed containing a biologically active filter media, and a third filter bed containing a biologically inert filter media. Water is present in the biologically active filter media and the biologically inert filter media. Water that drains from the second filter bed is collected and supplied to the first filter bed. Water that drains from the third filter bed is collected and recirculated to the third filter bed.
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