This document discusses the reverse osmosis (RO) plant at an aluminum smelter that treats effluent. The RO plant has a 50 m3/hour capacity and uses various filtration techniques including ultrafiltration and RO to achieve a high level of purity. Using RO for effluent treatment has reduced the plant's fluoride levels to under 1 ppm, eliminating water pollution and providing a safe environment while allowing 100% recycling of treated water for reuse in plant processes. The RO reject is evaporated faster through the use of mist fans and solar panels, providing an advantage over other fluoride treatment options.

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Reverse Osmosis Plant

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Process flow diagram of RO

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Why RO is Required
• Effluent treatment through Reverse Osmosis in Aluminum smelter is a
exemplary implementation in the country with complete management of
RO reject through forced evaporation in solar ponds.
• This provides the treated effluent the fitness to be re used in any process
application inside the plant leading to 100% recycling.
• This reduces plant's fresh water consumption resulting in water saving
and conservation of natural resources.
• Fluoride reduction in the treated effluent to a level of <1ppm eliminates
water pollution and provides a safe environment.

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Salient Features
•It has 50 m3
/hour effluent treatment capacity.
•Use of conventional water filtration techniques like Sand Filters and Activated Carbon
Filters with state of art techniques like Ultrafiltration System and Reverse Osmosis
filtration to get highest level of purity.
•Use of RO technology for effluent treatment particularly fluoride in aluminium smelter
effluent is one of its kind in major smelting industry.
•Accelerated RO reject evaporation through installation of mist fans (atomizers) for
increasing surface areas of the rejects.
•Use of solar panels for heating the air which is blown through the RO rejects for
faster evaporation.
•Advantage over other fluoride treatment options like ion exchange methods where in
regeneration of resin, resin replacement and other operational inefficiencies are
involved.

5. RODDING SHOP Reverse Osmosis – Impact on effluents
Impact of Reverse
Osmosis on effluents –
Fluoride Level <1 ppm

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Key Benefits of RO
•Fully automated system without any manual intervention.
•Consistency in output treated water quality even with variant inputs.
•Ensures hygienic working environment and reduces operators' exposure to
hazards.
•Recycling of effluent water for any industrial application.
•This system can be used for treating fluoride contaminated ground water for
domestic application.
•Zero discharge industrial wastes to ambient water.

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Ultra-Filtration & Reverse Osmosis snap shot
Sand and Carbon filters Ultra Filtration

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Ultra-Filtration & Reverse Osmosis snap shot
RO FilterSolar Heaters and Mist Fan

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Thank you

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Thank you