Mine water treatment
Nafasi Water has designed, built and operated four HiPRO™ plants on a large scale – each time showing the robustness of the process. Our HiPRO™ product comes in three forms:
HiPRO - Lite
The HiPRO-Lite product is aimed at smaller mines that do not treat large volumes of water. The plant is designed to treat up to 2.5Ml/d, in a manner that allows for the lowest possible CAPEX, while still being able to deliver the robust HiPRO™ process.
Water recoveries range from 98-99.5% recovery from Mine Impacted Water to potable quality.
HiPRO - X
Expandable and Adaptable.
Realising that many of our mining clients were uncertain about water quality or quantity of water to be treated (based on a sampling regime over a period), Nafasi Water developed HiPRO-X to bridge the issue between expected water, and actual medium-term requirements. HiPRO-X is the forerunner in our Expandable Plant technology, allowing a smaller plant to be implemented and operated for a period of time while pumping regimes are established throughout the mine. Once there is certainty on actual requirements, capacity can be increased without added operational complexity.
Ideally suited for plants in the region of 2-15Ml/d, HiPRO-X is able to achieve the class leading water recoveries that have made the HiPRO™ product world renowned. These range from 98-99.5% recovery from Mine Impacted Water to potable quality.
Brine Treatment Solutions
Treatment of water using Reverse Osmosis technology has proven extremely effective. However, even with HiPRO™ technology, many feed waters cannot be treated to zero brine. The final reject produced has typically been stored in brine evaporation dams with the expectation of efficient natural evaporation. In practice, however, natural evaporation is not sustainable for long-term operation. Coupled with space constraints in new plants, the costs of brine dams and the reluctance of environmental authorities to approve the construction of new brine dams, Nafasi Water aims to provide more efficient methods of dealing with brine.The treatment technologies considered currently fall into two categories:
- Freeze technology
- Evaporation technology
- Multiple Effect Steam Driven Evaporator to treat the entire brine stream;
- Mechanical Vapour Recompression Evaporator to treat the entire brine stream;
- Reverse Osmosis Brine Reduction and smaller Multiple Effect Steam Driven Evaporator;
- Reverse Osmosis Brine Reduction and smaller Mechanical Vapour Recompression Evaporator;
- Freeze Crystallisation to treat the entire brine stream;
- Reverse Osmosis Brine Reduction and smaller Freeze Crystallisation system.
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