Environmental Health - Toxic Substances
Biosolids, Animal Manure, and Earthworms: Is There a Connection?
Scientists collected earthworms from a soybean field fertilized with biosolids. The earthworms were analyzed for 77 different chemicals; 20 chemicals were detected in the earthworms.
Animal manure and biosolids, the solid byproduct of wastewater treatment, often are applied to agricultural crops to provide nutrients for plant growth and to improve the quality of soil. Earthworms studied in agricultural fields where manure and biosolids were applied have been found to contain organic chemicals from household products and manure. Earthworms continuously ingest soils and may accumulate any soil contaminants into their bodies. The chemicals detected included the active ingredients commonly found in a variety of household products—including the disinfectant found in antibacterial soaps, fragrances used in perfumes and detergents, and pharmaceuticals. The chemicals targeted in this study are referred to collectively by the authors as anthropogenic waste indicators (AWIs – see side bar).
U.S. Geological Survey scientists and their colleague from Colorado State University at Pueblo published the results of the earthworm study in Environmental Science and Technology. The scientists collected soil and earthworms from three agricultural fields—a soybean field fertilized with biosolids, a corn field fertilized with swine manure, and a soybean field that had received no applications of either biosolids or manure for at least 7 years. Samples were collected approximately one month after manure and biosolid applications (in the early part of the growing season) and again just before harvest. To determine what was in the material being applied to these fields, the scientists also collected samples of the applied biosolids and swine manure. All samples were analyzed for 77 AWIs. They found:
Anthropogenic Waste Indicators
Kinney, C.A., Furlong, E.T., Zaugg, S.D., Burkhardt, M.R., Werner, S.L., Cahill, J.D., and Jorgensen, G.R., 2006, Survey of organic wastewater contaminants in biosolids destined for land application: Environmental Science and Technology, v. 40, no. 23, p. 7207-7215, doi:10.1021/es0603406.
Glassmeyer, S.T., Furlong, E.T., Kolpin, D.W., Cahill, J.D., Zaugg, S.D., Werner, S.L., Meyer, M.T., and Kryak, D.D., 2005, Transport of chemical and microbial compounds from known wastewater dishcarges--Potential for use as indicators of human fecal contamination: Environmental Science and Technology, v. 39, no. 14, p. 5157-5169, doi:10.1021/es048120k.
These results build upon two recent studies that found that household chemicals were detected in biosolids and that pharmaceuticals were found in soil irrigated with reclaimed water.
This study is part of a long-term effort by the U.S. Geological Survey’s Toxic Substances Hydrology Program to determine the fates and effects of pharmaceuticals and other emerging contaminants in aquatic and terrestrial environments, and to provide water-resource managers with objective information that assists in the development of optimal wastewater management practices.
Kinney, C.A., Furlong, E.T., Kolpin, D.W., Burkhardt, M.R., Zaugg, S.D., Werner, S.L., Bossio, J.P., and Benotti, M.J., 2008, Bioaccumulation of pharmaceuticals and other anthropogenic waste indicators in earthworms from agricultural soil amended with biosolid or swine manure: Environmental Science and Technology, v. 42, no. 6, p. 1863-1870, doi:10.1021/es702304c.