City of Fayetteville Replaces UV Treatment System with BlueInGreen's HyDOZ® Solution

Introduction

Plant officials at a 12 MGD wastewater plant in Arkansas began evaluating disinfection alternatives to upgrade their current system as well as address the removal of contaminants of emerging concern (CEC). The facility, which included primary clarification, activated sludge, secondary clarification and sand filtration, elected to use dissolved ozone to replace its current ultraviolet (UV) system. After researching different ozone systems, plant officials chose to install BlueInGreen’s HyDOZ® technology in order to more efficiently meet current permit requirements, as well as prepare for future legislation. 


Project Goals

  • Reduce E.coli

  • Reduce CEC

  • Meet Fecal Coliform Permit Levels 


Method

When examined, the sand filter effluent contained 81 CEC, including pharmaceutically active compounds as well as a broad range of hormones. 31 CEC were identified in the ozone system influent sample. To combat these contaminants, BlueInGreen’s HyDOZ® system provided high ozone concentrations, using less energy to deliver the same level of disinfection as the existing UV technology. By delivering high ozone concentrations, the HyDOZ® was able to precisely target microcontaminants and pathogens, while simultaneously providing COD reduction, color removal and elevated dissolved oxygen levels. 


"It helps the business community. It helps the environment. It helps the fish that we have in our streams." - Mayor of Fayetteville


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Results

After pilot system installation and startup, the plant effluent improved significantly with the help of the HyDOZ®. Plant officials recorded a Fecal Coliform reduction from 3,700 cfu/100 mL down to single-digit levels. The HyDOZ® also reduced the COD by an average of 21 percent. Of the 31 emerging contaminants originally detected in the disinfection system influent, the HyDOZ® reduced nearly twice as many contaminants as the previous UV system and removed over half of the contaminants to below detection limits.


ON AVERAGE, THE HYDOZ® REDUCED THE CEC BY 82 PERCENT AND REDUCED OVER HALF OF THE CONTAMINANTS TO BELOW DETECTION LEVELS.  


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CEC Levels

 

Conclusion

On average, BlueInGreen’s HyDOZ® successfully reduced fecal coliforms to well below plant effluent permit levels and demonstrated an average 82 percent removal of emerging contaminants. The positive results prompted the city and design engineers to select the HyDOZ® for full-scale installation. BlueInGreen was sole-sourced to provide a complete ozone disinfection system including oxygen and ozone generators, as well and ozone dissolution and injection equipment. The system was recently installed and has already exceeded the plant management’s expectations. 


“We are very pleased to see that a local company is providing industry-leading water treatment technology that helps us achieve both our water quality and financial goals.” - Mayor of Fayetteville