The Type VPT - Vertical Packed Tower - is the standard vertical, counter-current packed tower scrubber system for large flows of gas, normally larger than 20,000 cfm capacity. Multiple stages in series can be provided to make possible the use of multiple scrubbing solutions. On-site bleach generation systems can also be provided to electrolytically produce the sodium hypochlorite (NaOCl) scrubbing solution.
EST Corporation was acquired by Severn Trent Services in 2001.