AWWA ACE70976

This powerpoint presentation outlines two water reuse case studies. The fist case study presents water reuse opportunities within an existing bio-pharmaceutical manufacturing facility in North Carolina, which includes a modeling and economic evaluation of water reuse in cooling towers. The project objective was to identify and evaluate water reuse opportunities that have a greater than 5% reduction in city water consumption at the facility. Experimental approach methods included: site water balance review; identifying options for reuse; evaluating technical feasibility; and, evaluating economic feasibility. The second case study presents a pharmaceutical tablet manufacturing facility in Ireland, which includes API removal from wastewater and effluent reuse. Project objectives and scope included: designing a new treatment plant specifically for API removal from pharmaceutical manufacturing plant wastewater and effluent reuse; and, developing criteria for effluent reuse in cooling towers - no APIs, low COD, low TDS, and low/no coliforms. APIs of concern are listed, along with wastewater characteristics and license limits; process flow diagram; the Ireland Manufacturing Plant; and, Pharma WWTP effluent results with respect to suitability for reuse in cooling towers. Conclusions indicate that: the combination of MBR+Ozone results in complete API removal and a high quality reusable effluent in cooling towers; need to blend effluent with city water to increase COCs above 3; ozone effectively destroys APIs to non-detectable levels, albeit at high dosages (>60 ppm); requires adjustments to water chemistry; and, operate cooling tower at 3 cycles or lower or have softener backwash and RO reject bypass WWTP. Includes tables, figures.