Martin County

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File #: 19-0446   
Type: Departmental Status: Passed
In control: Board of County Commissioners
On agenda: 4/23/2019 Final action: 4/23/2019
Title: UPDATE ON BIOSOLIDS MANAGEMENT
PLACEMENT: Departmental
TITLE:
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UPDATE ON BIOSOLIDS MANAGEMENT
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EXECUTIVE SUMMARY:
executive summary
Biosolids are the result of sewage sludge treatment that meets regulatory standards. They are a source of water, energy, and nutrients that can be recovered and used. About two-thirds of produced biosolids are used for land application or composting and the other third is disposed in landfills. There is statewide concern that land applied biosolids containing excess nutrients and other contaminants are being introduced into surface waters and degrading water quality. It's recognized that steps are needed to enhance current biosolids management practices and to implement innovative biosolids technologies that provide enhanced resource recovery, beneficial use and sustainable management practices.
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DEPARTMENT: Utilities and Solid Waste
PREPARED BY: Name: Anne Murray
Title: Hydrogeologist / Water Resources Coordinator
REQUESTED BY: Sam Amerson, P.E., Utilities and Solid Waste Director

PRESET:
PROCEDURES: None

BACKGROUND/RELATED STRATEGIC GOAL:

Sewage sludge is the solid, semisolid or liquid material produced during domestic waste treatment. Biosolids are the result of additional treatment of the sludge materials for land application that meet the EPA pollutant and pathogen requirements. There are three regulatory classes of biosolids for beneficial use by land application in Florida that include minimum quality Class B, intermediate quality Class A and high quality Class AA. The classes refer to treatment level of the biosolids to reduce pathogens (Class B) or eliminate pathogens (Class A). Class A biosolids that meet EPA restrictions for certain metals are referred to Class AA. Class AA biosolids are exempt from nutrient restrictions for land application based on the high level of treatment required. Typical Class AA biosolids contains high amounts of organic material and moderate amounts of nitrogen, phosphorous making it ide...

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