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City approves change order to add Archimedes screw conveyor after belt-press test shows drier solids
Summary
Testing of a new belt press at the wastewater plant produced drier solids that would not move reliably on the intended incline conveyor; council approved a change order to the manufacturer to add an Archimedes screw conveyor (same warranty, fewer moving parts) and a corrected funding designation (Fund 401, sewer operations).
Staff reported that initial testing of a newly authorized belt press at the wastewater treatment plant produced drier biosolids than anticipated, which reduced conveyor performance on the planned inclined belt conveyor. To address the issue, staff proposed a change order to add an Archimedes screw conveyor that would handle the drier material, maintain the same warranty, and reduce moving-part complexity and long-term maintenance.
Councilmember Carl DeYoung noted a budget note in the packet and staff corrected a typographical error: funding should be drawn from Fund 401 (sewer operations), not Fund 104. With that correction in the record, council approved the change order. Staff said the screw solution should reduce trucking costs over time because drier solids lower disposal volume.
