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Laboratory‐scale testing of a continuous CLAS process
Author(s) -
Bhowmick Madhumita,
Semmens Michael J.
Publication year - 1994
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1994.tb06241.x
Subject(s) - countercurrent exchange , stripping (fiber) , air stripping , ultraviolet , atmosphere (unit) , adsorption , environmental science , chemistry , volumetric flow rate , waste management , contamination , environmental chemistry , environmental engineering , materials science , wastewater , organic chemistry , physics , optoelectronics , thermodynamics , ecology , quantum mechanics , biology , engineering , composite material
No gases were released to the atmosphere when UV photooxidation was incorporated in a continuous closed‐loop air‐stripping process for removing volatile organic chemicals from water. The removal of five volatile organic chemicals (VOCs) was evaluated by passing the contaminated water once through a hollow‐fiber‐membrane module that received a countercurrent flow of air recycled from an ultraviolet (UV) photooxidation chamber. VOC removal was measured experimentally under a variety of operating conditions. The results compared favorably with the behavior predicted by a mathematical model of the process. When operated as a closed‐loop process, the photooxidation of the VOCs in the gas phase has several advantages over conventional air‐stripping with off‐gas treatment: the end products are reabsorbed back into the water flow; no exhaust gases are released to the atmosphere; and no adsorbent regeneration or disposal costs are incurred.