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Stainless pump installed in lime slaker

A Grundfos booster pump installed at a lime slaking facility in Mpumalanaga, South Africa

PUMP UP THE LIME The Grundfos booster pumps boosting water from the permeate water tank to the slaker tank

20th August 2021


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A stainless steel Grundfos booster pump is at work at water reclamation and desalination technology company Nafasi Water’s recently commissioned lime-slaking facility in the Mpumalanga coal mining region.

In a release published last month, Nafasi Water chief strategy officer Ashton Drummond explained that the new facility serves an important mine water treatment plant in the area and will help the plant cut its operating costs.

“Instead of transporting lime to site in its heavier form – as calcium hydroxide – we can now reduce delivery volumes by transporting calcium oxide and slaking it on site,” said Drummond. “The cost savings make for an attractive payback period for the investment in the lime-slaking reactor.”

Grundfos associate sales engineer Raymond Makgoga noted that two Grundfos stainless steel end-suction pumps were supplied to the project – one for duty and one for standby.

“The stainless steel is an important requirement, [owing] to the corrosive nature of the permeate being pumped into the lime slaker,” said Makgoga. “Our Grundfos NB/NK stainless steel end-suction pumps are excellent solutions for industrial applications, including where pumping of aggressive media is required.”

The installed pump delivers 50 m3/h at a pressure of about 4.5 bar. He noted that the pump’s efficiency had been enhanced by an IE3 WEG motor rated at 15 kW. The WEG motor was also able to accommodate the plant’s requirement for 525 V input.

Nafasi Water’s plant treats mine-impacted water to a high level of quality, allowing it to be discharged back into the river system in compliance with environmental regulations. The quality of the water is, in fact, so good that it is also pumped to the local municipality as drinking water for the community.

The company’s treatment plants apply its proprietary High Recovery Precipitating Reverse Osmosis technology, allowing up to 99.5% water recovery from complex waters emanating from mining areas.

The relationship between Nafasi Water and Grundfos goes back many years, said Drummond, explaining that its water treatment plants make extensive use of Grundfos pumps.

He noted that Grundfos is “exceptionally competitive” when responding to market requests for pump packages. Its wide range of pumping solutions allows Grundfos to offer technically compliant solutions that meet customer needs.

Meanwhile, as Grundfos pumps are extensively used in breweries, distilleries, wineries and soft drink plants, the company also offers “leading technology” for disinfecting water in these facilities. The company recognises that hygiene is at the centre of this industry, says Grundfos associate sales engineer Raymond Makgoga. “Alongside all the quality Grundfos pump solutions that are used by food and beverage producers, our offering includes the sophisticated Oxiperm Pro disinfection system. “This is a one-stop chlorine dioxide generator that facilitates effective and efficient cleaning-in-place (CIP) solutions.” The system creates a diluted chlorine dioxide solution from sodium chlorite and hydrochloric acid, disinfecting the water supply and allowing pipelines in a plant to reliably cleaned in between production batches. The use of chlorine dioxide is able to render the water safe and hygienic without affecting its taste or smell – another vital element for success in this sector, he says. Grundfos lead key account manager Dean Naidoo highlights that the Oxiperm Pro has been tried and tested in many food and beverage applications. It has even been used to provide high-quality drinking water for corporate drinking fountains. “The accuracy of the dosing system supports the responsible use of water when cleaning and sanitising the inside of pipes,” says Naidoo. “By ensuring the correct chemical strength, the user can optimise the water volumes that must be passed through the plant pipelines to remove microbes.” Water can also be recirculated through the Oxiperm Pro at a higher strength, if pipeline testing indicates that the sanitation standard is not yet achieved. The componentry of the Oxiperm Pro includes three smart digital dosing pumps, a reactor and controller. D Colour-coding is used to enhance safety and ease of use.

Edited by Nadine James
Features Deputy Editor



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