Due to the current drought situation and failing historic surface water sources, the Colorado River Municipal Water District (CRMWD) began to look for alternative water sources in order to meet their clients’ water demands. As a result the CRMWD reached the decision to build a potable water reuse plant in the City of Big Spring that would collect and treat up to 2 million gallons of treated effluent from the City of Big Spring’s Wastewater Treatment Plant (WWTP).

PSC was tasked by the City of Big Spring with evaluating the city’s current WWTP and designing improvements to the facility that would facilitate the delivery of high quality effluent to the new reuse facility. Upon completing the evaluation, PSC recommended and designed improvements to the 25-year-old plant’s aeration basin and effluent filters. The chosen improvements were critical for the plant to supply effluent capable of reuse to the CRMWD plant and to maintain TPDES compliance. This was particularly important because the city’s WWTP did not have effective screening, grit removal or primary clarification.  Due to time constraints of the new reuse facility, the new filters would be the first of a two-phase project to upgrade the City of Big Spring WWTP and would provide the effluent polishing to reduce turbidities and allow the new potable reuse membrane plant completed by CRMWD to run more efficiently.

The chosen WWTP improvements included new diffusers in the aeration basins, a new air supply line and steel truss structure and removal of sludge from the aeration basin. PSC also designed the retrofit of the existing traveling bridge effluent filters with new cloth media filters. The new cloth filters were so efficient that the new filters took a 50 percent footprint of the original traveling bridge filters.