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Metropolitan Denver Sewage Sludge Fed to Feedlot Steers^1,2,

Colorado State University, Fort Collins 80523

Abstract

Feedlot steers received 0, 4 or 12% Metropolitan Denver Sewage Sludge (MDSS) on a dry weight intake basis for a 94-day finishing period. The MDSS was anaerobically digested primary sludge that had been treated with polyelectrolyte to aid in dewatering during vacuum filtration. It was then dried to 35% water prior to mixing into the pelleted diet given the steers. Cattle (six on each treatment) were slaughtered and kidney, liver, muscle, bone, brain, blood, lung, spleen and fat were analyzed for As, Cd, Cu, Hg, Mo, Ni, Pb, Se and Zn.

Growth of MDSS animals was less than controls (P<.025) because MDSS, apparently, provided no energy. MDSS ingestion caused no pathology. All 10 inorganic elements except Ni were increased in one or more body tissues following the 94-day MDSS ingestion. Percentage whole carcass retentions of ingested minerals were estimated as follows: .2% As, .04% Cd, .3% Cu, .07% Hg, .2% Mo,<.006%Ni, .6%Pb, 1.3%Se, .2%Zn, and 32% F. Steers retained low amounts of the toxic heavy metals from MDSS ingestion.

¹ Supported by EPA and FDA (contract 68-03-2210) and published as Scientific Series Paper No. 2333.

² The work upon which this publication is based was performed pursuant to Contract No. 68-03-2210 with the Metropolitan Denver Sewage Disposal District No. 1, Commerce City, CO, and jointly funded by the Municipal Environmental Research Laboratory, U.S. Environmental Protection Agency, Cincinnati, OH, and the U.S. Food and Drug Administration, Bureau of Foods, Division of Chemical Technology. The contents of this paper do not necessarily reflect the views and policies of the Environmental Protection Agency or the U.S. Food and Drug Administration, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.

³ Professors, Department of Animal Sciences, CSU.

⁴ Metro Denver Sewage District No. 1, Commerce City, CO 80229.

⁵ USFDA, Bureau of Foods, Division of Chemical Technology, Washington, DC 20204.

⁶ Ultimate Disposal Section, Wastewater Research Division, Municipal Environmental Research Laboratory, U.S. Environmental Protection Agency, Cincinnati, OH.