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Project

nansemond treatment plant digester and struvite upgrades

Upgrades to the Solids Train of the Wastewater Treatment Plant to increase capacity of the plant and allow more efficient biosolids processing.

Process Pipe

21,120 LF

Valves

300+

Instruments

350+

Process Equipment

85+

Project Details

The project includes construction of a new freestanding pre-dewatering facility consisting of new centrifuges, carbon odor control system, polymer system, emergency truck offload system, and digester feed pumping system. The existing digester system is being replaced with new equipment to handle the additional solids load, inclusive of new hot water system, boilers, concentric tube heat exchangers, jet mixing system, recirculation heating system, and digester cover repairs. Existing digester gas system and exposed flares are replaced with new gas conditioning and blower system (moisture removal, cooling, and compression) and a new enclosed flare w/control system with a peak capacity of 25,500 cfh.

Continued plant operation of digester and digester gas operation coordination efforts include temporary sludge heating and mixing processes, and temporary digester gas piping and flare system. Modifications to existing final dewatering centrate processing and new pre-dewatering centrate through a new side stream nitrogen system and struvite recovery facilities further facilitate final effluent struvite reduction.