Thermal hydrolysis treatment of wastewater
During 2015, DCWater installed a new process that produces Class A biosolids product, which can be safely used as a fertilizer in homes and urban areas. The process is a combined thermal hydrolysis and anaerobic digestion and the impact of this new process in the concentration of persistent organic pollutants is widely unknown. This research project aims to identify the impact of this new process in PBDE concentration in the new Class A biosolids compared to the previous process which produced Class B material. Though Class A material produced always meets regulations set by EPA, organic pollutant presence or absence may be useful information in the use of this product for certain applications. Moreover, once the impact of this new process is known, it may be easier to predict the concentrations and impact on similar chemicals. More information about this project is available online.