St. Bernard Parish

St. Bernard Parish

Location: St. Bernard Parish, LA

The community of St. Bernard Parish and its engineering firm, designed and built a 12 MGD water treatment plant. This plant needed to replace an aging system and supply high quality potable water to the Parish, located east of New Orleans. In addition to the water treatment plant, the project also entailed 33 miles of transmission line, storage facilities and pumping stations.

Upon entering the plant, the water is sent into the RotaClear™ clarifiers, which are fabricated from stainless steel to eliminate long-term maintenance costs. Each RotaClear™ clarifier has a single drive rotor mechanism that provides for primary and secondary mixing zones as well as solids recirculation. A coagulant is added between the mixing and settling zones of the clarifiers to promote coagulation. The clarifier effluent then passes through a chlorine contact basin and into the filters.

The six-cell Filtralator™ gravity filter is designed with additional expansion space should granular activated carbon (GAC) be required in the future. The clarified water is flow-controlled by valves and split equally into the dual media filters. The underdrains are a monolithically poured 6” thick false floor, utilizing Tonka Water’s media-retaining nozzles. Each filter cell includes the value-added Simul-Wash™ backwash system.

The plant is performing extremely well, and has been exceeding expectations since commissioning. Tonka Water is proud to have assisted the community in achieving its treatment goals.

Raw Water
Post RotaClear
Post Filter
Turbidity107 NTU< 1 NTU < 0.08 NTU


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