CIRS Blog about Rural California
UNIVERSITY PARK, Pa. -- With endocrine-disrupting compounds affecting fish populations in rivers as close as Pennsylvania's Susquehanna and as far away as Israel's Jordan, a new research study shows that soils can filter out and break down at least some of these emerging contaminants. The results suggest that water pollution can be diminished by spraying treated wastewater on land rather than discharging it directly into streams, according to researchers in Penn State's College of Agricultural Sciences.
Using Penn State's 600-acre "Living Filter" -- a wastewater reuse system less than a mile from the University Park campus -- as a laboratory, researchers tested soil samples for the presence and accumulation of three estrogens. For almost three decades, more than 500 million gallons of treated wastewater from the campus has been sprayed annually from irrigation pipes onto this site, which is composed of cropland, grassland and forest.
To understand how endocrine-disrupting compounds behave in the soil, researchers extracted samples and analyzed for two natural estrogens, 17-beta-estradiol and estrone -- hormones naturally produced by humans and animals, such as dairy cattle -- and one synthetic estrogen, 17-alpha-ethynylestradiol -- a compound in birth-control pills.