Design Flexibility Reduces Sludge Digestion Costs at Conroe’s New Plant

Population increase and jurisdiction expansion drove the City of Conroe, Texas, to build a new Conroe Central Wastewater Treatment Plant (CCWWTP). Population increase and jurisdiction expansion drove the City of Conroe, Texas, to build a new Conroe Central Wastewater Treatment Plant (CCWWTP) to increase system treatment capacity. The owner contracted Lockwood, Andrews & Newnam, Inc. (LAN), a national planning, engineering and program management firm, to perform the design of the CCWWTP. LAN took the opportunity to provide added value by incorporating an advanced treatment into the design of the facility. This advanced treatment design, a two-stage process known as the A/B Process, would allow for beneficial anaerobic digestion of the two separate sludges produced. Design of the sludge processing system included blending of the two sludges, thickening, anaerobic digestion, dewatering, biogas capture, cleaning, storage, and use in power generation.

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