Skip to main content

Characterizing Human Health Risks Associated with Biosolids Land Application Practices

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Using the United States Environmental Protection Agency's (EPA) Multimedia, Multi-pathway, Multi-receptor Exposure and Risk Assessment (3MRA) technology, researchers have developed a computer-based biosolids groundwater risk characterization screening tool (RCST). The RCST, which generates a non-carcinogenic human health risk estimate (i.e., hazard quotient or HQ), has the ability to conduct screening-level risk-based characterization of potential human risks associated with the chronic (long-term) exposure to pollutants released from biosolids land application sites. Application of the RCST to biosolids land application sites located in Yakima County (Washington State) demonstrated that the soil depth to groundwater, regulated pollutant concentration and biosolids application rate were the site-specific parameters found to have the greatest potential impact on managing the risk of groundwater quality impairment.

In all scenarios investigated, the heavy metal selenium was found to be the most mobile of regulated biosolids pollutants. However, when the soil depth to groundwater was limited to 0.5 meter (and the application rate was held at 9 metric tons per hectare — mt/ha), the impact of biosolids pollutants on human health risks associated with groundwater consumption from wells located 1000 meters from the land application site was minimal. The HQ value was found to vary from 2.00 × 10−10 (for nickel) to 3.26 × 10−5 (for selenium) when the concentrations of biosolids pollutants were raised to 10X the ceiling concentration limit. Only under extreme biosolids applications and pollutant concentration conditions were public health risks characterized as significant. For example, when the biosolids application rate was increased from 90 to 900 mt/ha and the biosolids pollutant concentrations were increased to a level equivalent to 10X the ceiling concentration limit, the HQ values varied from 1.44 (for zinc) to 324.00 (for selenium).

Since current regulatory practices requires that biosolids be applied at rates no greater than the nitrogen-based agronomic rate and that no biosolids can be land applied having pollutant concentrations above the ceiling limits, these modeling results demonstrate and underscore the effectiveness of the current Part 503 rule as well as EPA recommended best management practices in protecting public health from pollutants associated with land applied biosolids.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: Biosolids; Land Application; Risk Characterization

Document Type: Research Article

Publication date: 2011-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more