Project at a Glance

Title: Emissions of volatile and potentially toxic organic compounds from wastewater treatment plants and collection systems (phase ii)

Principal Investigator / Author(s): Chang, D P Y

Contractor: UC Davis

Contract Number: A732-085

Research Program Area: Emissions Monitoring & Control

Topic Areas: Stationary Sources, Toxic Air Contaminants


The objectives of the Phase II research project on emission of potentially toxic organic compounds (PTOCs) from wastewater treatment plants were fivefold:

1. Assessment of the importance of gaseous emissions from municipal wastewater collection systems;
2. Resolution of the discrepancy between the measured and estimated emissions (Phase I) from the Joint Water Pollution Control Plant (JWPCP) operated by the County Sanitation Districts of Los Angeles County (CSDLAC);
3. Determination of airborne concentrations of PTOCs immediately downwind of an activated sludge aeration process at the City of Los Angeles' Hyperion Treatment Plant (HTP);
4. A modeling assessment of the effects of transient loading on emissions during preliminary and primary treatment at a typical municipal wastewater treatment plant (MWTP):
5. A preliminary investigation of effects of chlorination practices on haloform production. The results of those studies are reported in four separate volume. Volume 1, for which this abstract was prepared, contains a summary of results from each project; Volume 2 contains the discussion regarding the modeling of collection system emissions; Volume 3 addresses methods development and field sampling efforts at the JWPCP and HTP, data on emissions from a mechanically ventilated sewer and results of some preliminary haloform formation studies in wastewater; and Volume 4 discusses aspects of the emissions modeling problem.

For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

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