BATCH STUDIES ON A CLOSED-LOOP AIR STRIPPING PROCESS

Ultraviolet photooxidation is an effective process for the destruction of organics in air. In this paper we examine the use of u.v. photooxi dation to treat the exhaust air from a stripper. VOC contaminated wate r was air stripped using a hollow fiber membrane module and the VOC la den air was u.v. photooxidized and recycled to the stripper in a close d loop. Batch experiments were conducted under different operating con ditions. A mathematical model was developed for the process and model predictions of process performance compared favorably with the experim ental results. The closed loop air stripping process (CLASP) offers a number of potential advantages over conventional air stripping with of f-gas treatment: no VOCs are released to the atmosphere; the VOCs are oxidized to harmless end-products; no adsorber is required; and no ads orbent regeneration or disposal costs are incurred.