The State of the Practice of Class-A Anaerobic Digestion: Update for 2005

Authors: Willis, John; Schafer, Perry; Switzenbaum, Michael

Source: Proceedings of the Water Environment Federation, Technology 2005 , pp. 886-903(18)

Publisher: Water Environment Federation

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Abstract:

Since the 40 CFR, Part 503 regulations1 were promulgated in 1993, utilities and engineers have considered thermophilic anaerobic digestion configurations to produce Class A biosolids from municipal wastewater sludges. As thermophilic anaerobic digestion is not listed in the regulation as a process to further reduce pathogens (PFRP) other options have been used in order to achieve Class A biosolids. The most viable options are:

Alternative 1: Time and Temperature


Alternative 3: Documented Virus and Helminth Ova Destruction


Alternative 6: Treatment with an PFRP-Equivalent Process


The plants, utilities and private entities described in some detail within this paper include:

City of Los Angeles, CA: Hyperion and Terminal Island Wastewater Treatment Plants (WWTPs).


Columbus Water Works – Columbus, GA: South Columbus Water Resource Facility.


District of Columbia Water and Sewer Authority (DCWASA) – Washington, DC: Blue Plains Advanced Wastewater Treatment Plant (AWWTP).


Greater Vancouver Regional District (GVRD) – Vancouver, BC: Annacis Island WWTP


Inland Empire Utilities Agency (IEUA) – Rancho Cucamonga, CA: Regional Plant Number 1.


Metropolitan Sewerage District – Madison, WI: Nine Springs WWTP.


Infilco Degremont's 2PAD™ process.


Orange Water and Sewer Authority (OWASA) – Chapel Hill, NC: Mason Farm WWTP.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864705783977493

Publication date: January 1, 2005

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