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Grace Creek WWTP

Increasing Performance

The City of Longview had long struggled with its two existing gravity thickeners, which were constantly overloaded and producing thin sludge, contributing to the already poorly performing anaerobic digesters. Garver prioritized the City's improvements based on condition and designed innovative solutions that focused on optimizing anaerobic digestion performance, increasing biogas production, and alleviating operations and maintenance challenges.

"By converting the digesters rather than constructing additional digester space, these much-needed improvements saved the City millions," said Texas Water Team Leader Jeff Sober. "And the construction of a grease receiving station will provide the City with a new revenue stream through tipping fees."

Currently, grease haulers in Gregg County have to pay upward of 40 cents per gallon to dispose locally, or haul grease extensive distances to Shreveport or Dallas. The City utilized existing grease collection infrastructure to implement grease codigestion that will provide a mutually beneficial facility—the City will get revenue, while local haulers will have a less-expensive alternative within the city.

In addition to design phase services for the complete scope of work, Garver is currently providing construction observation and administration services for the project.

"Construction sequencing was a critical component of the design process since Grace Creek WWTP must be kept operational during construction and much of the existing infrastructure is being repurposed," Sober said.

Jeff Sober, PE
Water Team Leader
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