Water and Sewer Authority solves off-gassing Problem with Grundfos Smart Digital

The Beaufort – Jasper Water and Sewer Authority (BJWSA), is a nonprofit authority established by the State of South Carolina, in USA, to provide drinking water and treat wastewater in Beaufort and Jasper counties of South Carolina. Currently BJWSA has two modern water plants and multiple well sites capable of producing up to 39 MGD of drinking water and six wastewater facilities capable of treating up to 16 MGD. BJWSA is a leader in water reuse and is capable of reclaiming up to 5 MGD of water for irrigation, including South Carolina’s first residential irrigation service.

BJWSA was already familiar with the Grundfos (USA) DME dosing pump and digital dosing technology. Their engineering group had recently specified two DMEs on an ammonia hydroxide application at a water distribution pump station to “try” the technology and the Purrysburg WTP had purchased a DME to replace an aging hydraulic pump that was feeding fluoride. BJWSA understood the advantages of digital dosing technology.

With significant support from BJWSA, the Beta version of the SMART Digital DDA from Grundfos was chosen to be installed. It was powered up and primed still using the dilute 6 percent hypochlorite. Everyone was pleased to see dozens of hypochlorite bubbles the size of a dime (a small American coin) move up the clear plastic tubing through the pump head and out the discharge, an assurance that the pump was performing as desired.

The original pumps were not reconnected to determine the load, but the plant operator noted that during a power failure the UPC would last only 15 minutes with the motor-driven pumps and now lasts 45 minutes with the SMART Digital DDA. By reducing chemical use and power consumption through the use of the SMART digital, BJWSA is also reducing their foot print and environmental impact.