The State of the Practice of Class-A Anaerobic Digestion: Update for 2005
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
Utilities Agency (IEUA) – Rancho Cucamonga, CA: Regional Plant Number 1.
Metropolitan Sewerage District – Madison, WI: Nine Springs WWTP.
Infilco Degremont's 2PAD™ process.
Water and Sewer Authority (OWASA) – Chapel Hill, NC: Mason Farm WWTP.
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