UNSPSC 47101538: Sludge or sewage digesters

UNSPSC 47101538 Sludge or sewage digesters (Commodity) covers equipment replacement, rehabilitation, and ancillary services at wastewater and water treatment facilities—specifically drive shafts for mixer units, gravity thickener mechanisms, secondary clarifiers, aerated sludge holding tanks, gas purification scrubbers, and polymeric chain components that support digester and sludge-handling operations. State and local issuers procure under this code through a mix of sole-source equipment replacements, design-build rehabilitation projects, construction contracts on lump-sum or requirements-contract bases, and engineering design services. Issuing bodies span city water and wastewater utilities (Holly Hill, Phoenix, Rome, Salt Lake City), county authorities (Macon Water Authority, Gwinnett County, Charles County), and regional service providers (Maryland Environmental Service). The scope spans both capital equipment and material purchases—such as drive units and polymeric chains—and labor-intensive services including digester mechanism rebuild, clarifier rehabilitation, aerated tank design and construction, and sludge hauling.

Recent activity concentrates in the Southeast and Mid-Atlantic: Florida, Georgia (Rome and Macon), Maryland (Charles County, Maryland Environmental Service), Arizona (Phoenix), and Utah (Salt Lake City). Representative solicitations include the City of Holly Hill's sole-source procurement of a WesTech drive shaft replacement and turnkey installation for softener #2 (IFB notice, September 2020 adoption, $113,067.00 total value); the City of Phoenix's five-year vactor and sludge-handling requirements contract (IFB-27-0462, due October 19, 2026, DBE-N compliance required); the Macon Water Authority's rebuild of gravity thickeners and clarifier #6 (IFB, due October 20, 2026, mandatory pre-bid October 6, self-performance minimum 51 percent, 10 percent bid bond required); Charles County's engineering design for aerated sludge holding tank upgrades (RFP, proposals due July 13, 2026, $1.5 million estimated total project cost, 85 percent county / 15 percent WSSC funding); and Maryland Environmental Service's liquid sludge hauling contracts (small business reserve, May 2026 and April 2026 solicitations with per-gallon compensation structures and multi-year renewal options). Phoenix and salt-lake-city solicitations require pre-bid and pre-offer meetings; Maryland Environmental Service consistently posts multi-year liquid waste hauling contracts under SBR set-asides.