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Biosolids Research and Demonstration |
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Since 1973, the Biosolids Program has worked with local universities to develop and test biosolids recycling methods and crops. Research has included effects of biosolids on soils, crops, wildlife and water quality, as well as developing and testing application techniques. Results provide the technical basis for appropriate site management, environmental monitoring, development of regulations, public acceptance and quality assurance for landowners. University scientists act as technical advisors to our projects, providing third party review and oversight. Forestry Many aspects of biosolids recycling in forests have been studied by UW faculty and graduate students. Recent research projects include managing nitrogen and phosphorus, soil quality, identifying and managing odor, and long term effects of biosolids, including fate of metals and ecosystem response. At right, a scientist, a forestland manager and an environmentalist examine tree foliage response to biosolids fertilization. The University's C. L. Pack Experimental Forest, near Eatonville, has been the setting of many research and demonstration projects. In 2002, the Biosolids Interpretive Area at the gatehouse entrance to the forest is being updated to include examples of mine restoration and landscaping uses of biosolids products. In Seattle, organics and biosolids composting facility has been built near the the UW Center for Urban Horticulture. A research garden for students has been installed and a public demonstration garden is planned.
Winter Wheat At the Boulder Park project, Washington State University scientists study the effect of biosolids on soils and plant growth & yield. Four 'treatments' were compared: control (nothing added); anhydrous ammonia fertilizer at a rate of 50 lbs/acre of nitrogen; and two rates of biosolids supplying nitrogen at 50 and 100 lbs per acre. The photos below show the field at mid-season (left). Plots were 1000 feet long by 50 feet wide. The strips of darker green plants due to biosolids was visible from nearby roads. Wheat plants (right) were taken from the field and provide a close-up comparison of growth response. Compost and Turf Demonstrations Scientists at the Washington State University Research and Extension Center in Puyallup have created a compost demonstration garden and conducted research on pasture grass and turf grass production using a variety of biosolids products. Soil and Ecosystem Restoration A collaborative research effort in Kellogg, Idaho, is testing ways to restore vegetation to severely contaminated and eroding hillside soils and reduce the toxicity of wetland soils on this former mine and smelter site. Partners include the US Environmental Protection Agency, US Department of Agriculture's Agriculture Research Service, University of Washington, University of Idaho and the Northwest Biosolids Management Association. Biosolids from King County and several other municipalities and wood ash are being tested to see how well they can adjust soil pH, immobilize excess soil metals and provide plant nutrients. Initial results show good remediation potential. Visit the following University of Washington web sites for details and pictures: The Northwest Biosolids Management Association coordinates and funds collaborative research in the region. Summaries of Pacific Northwest research can be found at the following external link : Northwest Biosolids Management Association Online Library. |
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For questions about biosolids recycling or this website, please contact us at: Resource Recovery Updated: May 29, 2008
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