Wastewater Air Emissions Modeling Utilizing Toxchemÿ 4.3, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

Predicting air emissions from wastewater treatment systems has long been a part of Title V and Air Toxics air permitting requirements, and certainly part of annual emission inventory reporting requirements for most facilities.  Either engineering estimates or use of historical emission factors were largely the norm for the estimate of such wastewater air emissions. 

The United States Environmental Protection Agency’s (EPA) Office of Air Quality and Planning Standards (OAQPS) made Water9 the most widely-used software for estimating VOC emissions from industrial wastewater systems for much of the last 10-15 years.  Water9 was and remains a brilliant adaptation of scientific laws into a predictive model for wastewater unit emissions.  However, as more scientists, engineers, and regulators used Water9, it became very apparent that the software had distinct limitations and was in short, very difficult to use.  OAQPS has further acknowledged that Water9 has functionally met its end of life and there is no human or capital resource remaining to allocate to any further development of the Water9 emission estimating platform.

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