Tighe & Bond is currently serving in the role of Technical Advisor and providing peer review services for a project to design, install, and commission a new thermal belt drying system and additional centrifuge for processing biosolids at the Downriver Wastewater Treatment Facility in Michigan. The project includes the installation of two natural gas-fired Veolia/Kruger belt dryers. As part of a progressive-design-build team, Tighe & Bond is working with Wade-Trim and Walsh Construction to provide the Downriver Utility Wastewater Authority (DUWA) with a system that reduces solids volume and weight, thereby reducing disposal costs and producing a Class A product suitable for beneficial reuse.
The project included an assessment of existing conditions and equipment to detail how the proposed drying system will fit into existing wastewater plant operations. An alternatives analysis was completed for the following:
- Feasibility of initial dryer operation without the use of strain press
- Development of centrifuge equipment alternatives
- Review of dust management alternatives
The design is currently at the 60% complete stage, and the project is proceeding into final design and construction. The team is designing and overseeing procurement and installation of sludge feed pumps, new centrifuge, cake bin and cake pumping system, polymer feed system, sludge cake and dried product conveyance systems, dried product crushing to increase product density, offload facilities, dust collection, building ventilation, odor control, and fire suppression. Tighe & Bond is playing a key role in reviewing the design of the dryer system, including layout options, water, gas, and electrical requirements, instrumentation and controls, product conveyance, and dust management. Plant operations will be maintained throughout the project, which is slated for completion in 2022.