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By National Research Council, Division on Earth and Life Studies, Board on Environmental Studies and Toxicology, Committee on Toxicants and Pathogens in Biosolids Applied to Land

Document from the Committee on Toxicants and Pathogens in Biosolids utilized to Land. Softcover.

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A number of risk algorithms were used to calculate the 1993 chemical limits. The general algorithms are still valid, but some fate and transport models and exposure parameter assumptions used in the calculations have advanced since 1993, and some alternative assumptions have been supported by new studies. Chemical limits should be based on an integrated evaluation of all exposure pathways that might affect the identified receptors. Findings: The committee found the technical basis of the 1993 chemical standards for biosolids to be outdated.

6 million dry tons of sewage sludge are used or disposed of annually in the United States, of which approximately 60% are used for land-application or public distribution (see Chapter 2). 1% of available agricultural land in the United States is treated with biosolids. Biosolids are a complex mixture that may contain organic, inorganic, and biological pollutants from the wastewaters of households, commercial establishments, and industrial facilities and compounds added or formed during various wastewater treatment processes.

Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted. Please use the print version of this publication as the authoritative version for attribution. INTRODUCTION 27 more stringent standards set by other countries. In addition, there is increasing concern among communities near land-application sites about the health risks from exposure to biosolids.

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