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Biofiltration for Odor Control

The Problem
A large nut roasting operation relocated to a new plant in an industrial park in Ontario. Shortly after starting their operation workers at a neighbouring company began to complain about nuisance odours and potential health concerns. The complaints escalated and provincial environmental officers became involved. A notice was served requiring the company to take remedial actions to minimize occurrence of odour nuisance complaints.

Our Approach
ZORIX Consultants Inc. was initially retained to liaise with the Ministry of Environment, investigate the problem and to recommend a strategy for odour abatement. We conducted an odour assessment program, including odour sampling, sensory evaluation and off-property impact modelling. The results confirmed that our client’s process emissions could indeed cause an adverse effect in the neighbouring area. The odour assessment work also identified the extent of the potential impact and helped in defining the required degree of control and therefore levels of investment. We conducted an initial process review to explore opportunities to prevent or minimize release of odour. In addition, several abatement technologies were considered for this application using cost/benefit analysis.

The Solution
An enclosed biofilter was selected as the best solution in this application. Biofilteration offered lower operating costs, was a good match to our clients’ processes and was also an environmentally friendly choice compared to other alternatives. ZORIX managed a fast-track design/build contract to meet the client’s in-service date requirements for the installed system.

The fully enclosed engineered biofilter has been in operation since the summer of 1999. Our client has received no further odour complaints and has met all regulatory requirements.