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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.

East Bay Municipal Utility District (EBMUD) – Oakland, CA.

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.

Ondeo Degremont's 2PADTM process.

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

Publication date: 01 January 2004

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