WATER PAGES
NIPSCO wins Water Award for meeting discharge limits using sustainable ultrasonic technology
Northern Indiana Public Service Co.(NIPSCO) has received the Water Award by POWER magazine for meeting NPDES permit limits with eco-friendly ultrasonic technology developed by LG Sonic B.V.
The POWER Water Award recognizes outstanding water-related projects worldwide at power plants that demonstrate excellence in managing water and/or wastewater streams.
Power generating facilities like NIPSCO need to keep their discharge within strict ranges. Failure to comply with the discharge limits may result in fines and in the inability to operate the generating units. In the U.S., the National Pollutant Discharge Elimination System (NPDES) regulates point sources that discharge pollutants into water bodies. To maintain water quality in receiving waters, NPDES permits impose effluent limitations. The guidelines and standards for limiting effluent from non-municipal sources are established by the U.S. Environmental Protection Agency.
NIPSCO operates four coal-fired units with a capacity of approximately 1,943 MW. The facility takes its cooling water from the Kankakee River. Prior to being returned into the river, the water is discharged to a final settling basin. This basin is 194 acres in size and has an average depth of approximately 10.7 feet. The water discharge must comply with the limits set by the NPDES.
To ensure compliance with the standards, total suspended solids (TSS) must be kept below 30 parts per million (ppm) a day, and less than 15 ppm monthly. Additionally, the pH must be less than 9. Settling ponds are usually rich in nutrients. Water in the basin absorbs heat as it passes through the condensers in the plant, which makes it warmer than river water. This leads to algae growing quickly and negatively impacting both TSS and pH levels.
Moving away from algaecides
To comply with the NPDES limits at the final settling basin, NIPSCO used algaecides for years. However, algaecides can be costly. Besides, due to the pond discharge going backto the river, algaecides could not be added directly to the basin as an alternative. Despite using chemicals, the filters from the TSS samples remained green with algae. The company also considered filtering the pond discharge, but this was not economically feasible.
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“We were using both an algaecide [quaternary amine] and a UV-blocker at all our cooling towers. By the end of season [2019], we eliminated using the UV-blocker chemical and we reduced the algaecide by 25%. In 2020, we were able to further reduce use of algaecide to 33% of what we used before the [MPC-Buoy] installation.” – Brian Snyder, Sr. Chemical & Environmental Specialist at NIPSCO.
A chemical-free solution
MPC-Buoys are floating, solar-powered systems that combine continuous water quality monitoring, web-based software, and ultrasound technology to effectively control algal blooms in real-time. The buoys are anchored in the water. They emit ultrasonic waves that create a sound layer in the top layer of the water, impacting the
buoyancy of algae cells. These cells sinkto the deeper layers of the water column, where they cannot access sunlight anymore and naturally die.
The MPC-Buoy technology consists of a three- stage process. First, it monitors algae species and water parameters in real-time; Second, based on the collected data, it predicts new blooms up to 10 days before they occur. Third, it uses a data- driven, learning algorithm to adjust wave frequencies in response to algal mutations and environmental changes.
“Controlling algae with low-power ultrasound is a well-established technology that has been in existence for many years. It is an environmentally friendly technology that is harmless to fish and plants,” Lisa Brand, CTO & Microbiologist for LG Sonic, told POWER.
Celebrating the extraordinary talent of Women in Engineering
On International Women in Engineering Day WCS Group shines a light on two of its talented engineers, Holly Waterman and Mónica Rodrigues.
International Women in Engineering Day (INWED) is an awareness campaign which raises the profile of women in engineering and focuses attention on the amazing career opportunities available to women and girls.
| August 2021 |
www.draintraderltd.com
The 2021 theme is Engineering Heroes, which gives special focus to the women who undertake “everyday heroics”, who recognise a problem and are part of the solution. Holly, legionella risk assessor at WCS and Monica, proposals engineer at WPL, have critical roles to play in protecting communities and the environment, and supporting customers in delivering safe and compliant water and wastewater services.
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