FIVE YEARS OF POST-AERATION

NOLAND WASTEWATER TREATMENT PLANT

 

Technology: SDOX 

Application: Post-Aeration 

Location: Arkansas 

Owner: City of Fayetteville 

Engineer: CH2M Hill 

Goals: Meet DO Requirements | Reduce Operating Costs

 

INTRODUCTION

In order to protect the environment, wastewater treatment facilities across the country are required to deliver dissolved oxygen (DO) into the treated effluent, with most DO permits ranging from 2 to 10 mg/L. This is the case for the Paul R. Noland Wastewater Treatment Plant, located in Fayetteville, AR. The plant’s National Pollutant Discharge Elimination System (NPDES) permit, as issued by the Arkansas Department of Environmental Quality (ADEQ), requires a DO discharge of 7 mg/L through the months of April to November and 9 mg/L from December to March.

 

OVER A FIVE-YEAR SPAN, THE SDOX TECHNOLOGY REDUCED OXYGEN CONSUMPTION, DECREASED ENERGY COSTS AND SAVED THE NOLAND WWTP OVER $180,000.

 

METHOD

BlueInGreen’s SDOX technology operates more effectively than traditional DO delivery systems, recording oxygen transfer efficiency rates of up to 99.9 percent. By injecting a sidestream into a pressurized oxygen tank, the SDOX saturates the water, resulting in concentrations of nearly 350 mg/L. The highly oxygenated sidestream is then returned to the larger body of water, where rapid liquid-to-liquid mixing of the sidestream occurs. The rapid diffusion of the liquid ensures DO permit levels are consistently and instantaneously achieved.

 

 

 

 

“THIS IS MY FAVORITE PIECE OF EQUIPMENT. YOU TURN IT ON, AND IT DOES WHAT IT’S SUPPOSED TO.”

- WASTEWATER TREATMENT OPERATOR

 

CONCLUSION

The plant easily exceeded the required DO level, and the savings provided complete project payback within four years due to the reduction in operational costs. Had the SDOX been initially designed into the facility, rather than being retrofitted at a later date, the need for a post-aeration basin would have been eliminated, providing more savings and further minimizing the facility’s footprint. Contact a BlueInGreen representative to find out how you can benefit from our water treatment solutions.

RESULTS

Competing aeration methods transfer oxygen into water via bubbles. However, a substantial portion of the bubbles exit through the water surface without being absorbed, increasing operational costs. The SDOX is essentially bubble-free, and the 99.9 percent oxygen transfer rates translated into both short and long-term cost savings for operators at the Noland Wastewater Treatment Plant. Since its installation, the SDOX has required no maintenance other than a routine pipe seal replacement, decreasing facility spending each year.