WARRENDALE, PA, Feb. 7, 2007 -- The city of Hudson, NY, had aging slow-sand and diatomaceous earth (DE) filter systems which had been struggling to meet effluent water quality treatment goals. Total organic carbon (TOC), disinfection by-product precursors and turbidity reduction were the key problem areas. Turbidity spikes were caused by the DE filters failing periodically and in addition haloacetic acid (HAAs) and total trihaolomethanes (TTHMs) exceeded regulatory limits.
Knowing that they needed to improve treatment performance and expand their plant capacity the City hired a consultant to evaluate a number of treatment technologies.
The Trident process consists of upflow Adsorption Clarification followed by Mixed Media Filtration in a packaged treatment system. Prior to entering the Adsorption Clarifier®system coagulant and polymer are added for coagulation. Flocculation and solids capture occur in a bed of buoyant clarifier media contained in the clarifier section. The clarified water is then filtered through a Mixed Media bed consisting of anthracite, sand and garnet. Each layer of filter media has a progressively smaller effective size and increasing specific surface area to form an ever tightening filter bed. Both the clarifier and filter are periodically cleaned using an air-water flushing system...
To read the full case study, click here.
###
