South Plant Digester Gas Utilization Study
WTD initiated a study to ensure the agency responds to the changing energy landscape while maintaining a reliable energy supply to support nonstop operations. This study compares current biogas management systems and energy production facilities at South Plant against alternative approaches to make certain the digester gas produced at the plant is used to its maximum benefit.
View report (6.8 MB)
Co-digestion of Brown Grease
Brown grease from restaurants can accumulate inside sewer pipes and clog them making for inconvenient and expensive sewage backups and repairs. But if properly collected, grease can be a rich source of “food” for methane-producing bacteria in wastewater digesters. WTD is finalizing a demonstration project proposal for a “Brown Grease Receiving Site” to determine if we can cost-effectively turn this “waste” product into energy.
View report (5.8 MB)
Maximizing the Benefits of Biosolids
WTD scientists are exploring the feasibility of incorporating the latest technical advancements in nutrient harvesting and odor reduction in biosolids.
West Point Biosolids Odor Study
The Technology Assessment team conducted a biosolids characterization study to determine if it were possible to oxidize sulfur compounds before the biosolids leave the plant.
The study tested whether potassium permanganate (KMnO4), a strong oxidizer known to target sulfur compounds, would reduce biosolids odor if it were added to wastewater solids prior to the centrifuge stage of treatment.
A summary of this study will be posted on this page as soon as it is available.
The Next Wave of Water Treatment
The Technology Assessment Program is committed to identifying the best methods for removing unwanted constituents in wastewater - recent projects concern the removal of estrogens and nitrogen. Also, in advance of the next era of wastewater infrastructure projects, the program has analyzed and tested a variety of capture and treatment systems to address combined sewer overflows.
For more information about resource recovery, please contact us at:
- 201 S. Jackson Street, KSC-NR-0512, Seattle, WA 98104