# Cedar Rapids Ionwave #6150088-01

Cedar Rapids UASB Reactor No. 2 Repairs and Improvements

**Posted:** November 04, 2026
**Respond By:** December 09, 2026
**Identifier:** 6150088-01
**NAICS:** 237110, 237990

The City of Cedar Rapids is seeking bids to repair and improve Anaerobic Reactor No. 2 at its Water Pollution Control Facility.
- **Government buyer:** City of Cedar Rapids, Utilities Department; Water Pollution Control Facility.
- **Project:** Upflow Anaerobic Sludge Blanket (UASB) Reactor No. 2 improvements, including replacement of trough and weir hardware, scum plates, and gas boots; liner, cover gasket, and interior piping repairs; pressure-relief-valve installation; and other related work.
- **OEMs and vendors:** **Anderson Greenwood / Emerson** pressure relief valves; **Veolia Water Technologies, Inc.** is the required source for all items listed in the Bill of Materials on Drawing 463-00. Veolia also inspected Reactors 2 and 3 and recommended returning Reactor 2 to service. No detailed BOM quantities or prices are provided.
- **Products and quantities:** Two owner-supplied Anderson Greenwood Series 90/9000 pilot-operated pressure relief valves; exact valve models and part numbers are unspecified. Nitrogen-purge guidance also specifies two pressure gauges and two isolation valves, plus nitrogen supply, regulator, rated hose, check valve, and optional rotameter and pressure relief valve.
- **Work and requirements:** Verify pressure relief valve operation; repair or replace reactor FRP components, gas-box parts, piping, gaskets, liner, corroded supports, and exposed insulation as needed. Nitrogen purge the reactor gas space through the emergency flare before startup, monitor oxygen and work-area safety, and continue until sampled oxygen is below 12%.
- **Estimated construction cost:** $495,000, with a separate $50,000 allowance for unanticipated related work.

### Description

The City of Cedar Rapids is seeking bids for improvements to upflow anaerobic sludge blanket reactor No. 2 at its Water Pollution Control Facility. Work includes replacing trough and weir hardware and scum plates, gas boot replacements, liner and cover gasket repairs, interior piping repairs, installation of two owner-supplied pressure relief valves, and miscellaneous improvements. The contractor must purchase items listed in the Bill of Materials on Drawing 463-00 from Veolia Water Technologies, Inc. The City Engineer’s opinion of probable construction cost is $495,000; a pre-bid conference is scheduled for November 16, 2026.

[View original listing](https://citycrbids.ionwave.net/PublicDetail.aspx?bidID=1967&SourceType=1)