Case Study : ROPEC


The Problem

Robert O. Pickard Environmental Centre’s (ROPEC) in Ottawa, Canada was undergoing needed upgrades and expansions to the thickening and dewatering building on site. This building plays a vital role by providing septage receiving and pumping, sludge mixing and thickening, as well as dewatering of digested biosolids. These processes release H2S, Ammonia, and other VOC’s into the air which cause an unpleasant odor.  Due to the expansion, the need to add additional odor control solutions became vital to the facility to help prevent future odors and gas releases. ROPEC needed a unique solution to remove these gases from the air at high efficiency levels


In order to provide the City of Ottawa with the most efficient solution to remove the large volume of gases emitted at the facility, PureAir proposed their V-Bank Transition Systems (VTS).  The V-Bank Transition System is a high efficiency, horizontal air flow configuration  that provides large air flow capacity with low pressure drop and a compact design. 

PureAir provided three VTS 15000 systems constructed out of fiber reinforced plastic (FRP), with the air flow capacity of 7,500 CFM each unit.  To be able to target the high release of H2S, Ammonia, and other VOC’s, PureAir was able to customize the each VTS to have four beds of chemical adsorbent medias rather than the standard two or three.  PureAir’s offered the following chemical adsorbent media to remove these high levels of odor: Sulphasorb XL™, CPS Blend,  Ammoniasorb®, and Omnisorb. In order to gaurantee optimum and long term system performance, including no odor escape, ROPEC also  decided to also install one Electronic Adsorbent Bed Monitor (EBM) on each VTS.  These EBMs are able to measure the remaining life  of the adsorbent media in the system in real time to ensure that there is no surprise breakthrough of gases


After the systems was in place, the City asked Welburn Consulting to design and conduct an air testing program that would access the performance of the odor control systems PureAir Filtration had provided.  These tests were conducted through gas injections and air sampling, and then the samples were analyzed through various laboratory methods to determine the reduced levels of VOC’s. The conclusion of the tests resulted in removal efficiency of >99.9 ± 0.04%  Hydrogen Sulfide and 99.7 ± 0.2% Ammonia.


Concluding from the tests, PureAir is proud to say they were successful in removing the large volume of odorous gases at the thickening and dewatering building at ROPEC. PureAir looks forward to providing high efficiently systems to new clients, like ROPEC in the future.

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