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Queensland Manufacturing Plant Expansion

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Mitigating Odour Impacts from Manufacturing Plant Expansion

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Environmental ConsultingEnvironmental Consulting

Industry

General Manufacturing

Location

Australia

Trinity Consultants Australia helped a South-East Queensland manufacturing facility expand its operations by delivering robust odour sampling, CALPUFF modelling, and practical mitigation recommendations to manage potential weather-dependent odour impacts.

 

Challenge

The proposed expansion of a South-East Queensland manufacturing plant was designed to facilitate an increase of the facility’s production. The key driving factor for this project was the potential for the proposed changes to increase odour impacts, with odour especially dependent on weather conditions. Thus, expert modelling and interpretation were required. Trinity Consultants Australia provided odour assessment services including odour sampling and air dispersion modelling for the proposed expansion.

Solutions

Trinity conducted odour sampling of various on-site sources, then used the data to model odour emissions based on existing and proposed operations. Modelling was performed using CALPUFF based on site-specific meteorology data. Existing odour sources included a range of source types, such as process stacks, raw materials, biofilters and wastewater ponds. The proposed expansion included a biofilter that would be used for filtering process air from a new building. Many of the odour samples were collected using a flux hood in accordance with AS 4323.4:2009 Stationary source emissions – Flux chamber technique. Samples were analysed by a NATA accredited laboratory in accordance with AS 4323.3:2001 Station source emissions – Part 3: Determination of odour concentrations by dynamic olfactometry.

Services Performed

The team conducted odour sampling from multiple sources, performed dynamic olfactometry per national standards, and used CALPUFF dispersion modeling with local meteorology. They provided recommendations for practical odour management and mitigation measures.

Results

The robust dispersion model showed that the additional odour contribution from the expansion would have minimal influence on overall off-site odour levels, which were already defined by existing operations. Based on these results, Trinity provided clear recommendations for potential odour mitigation and management strategies, enabling the facility to move forward with confidence that expansion could be achieved with minimal community impact.

100%

Of major odour sources sampled and assessed

1

Robust CALPUFF model using site-specific weather data

Zero

Significant off-site odour impacts expected from the new expansion