The Indian Institute of Chemical Technology, Hyderabad, has developed a cost effective way to convert Reverse Osmosis membranes to Nano Filtration membranes. The plant with such converted membranes is useful for the treatment of surface water.
The permeate water is remineralized to 60 to 120 ppm TDS.
This plant removes all impurities in a single step including excess total dissolved solids (TDS), salinity, hardness, turbidity, heavy metals and microbial content.
The reject water from the plant is being recycled for domestic purposes. Greater water recovery (80%) with low rejects volume. The reject water can be reused for washing water, laundry and other purposes.
Minerals such as Ca, Mg, P, Na, K essential for human consumption and health are retained.
Longer membrane life and lower fouling by impurities.
The operating cost in these plants is about 5-7 paise per L of purified water generated.
Environmentally safe as the materials used in the process are recycled and reused for other chemical treatments.
The technology covers a membrane assembly unit with high pressure pumps, prefilters, and pressure vessel and auxiliary equipment.
For further details, contact:
Dr. S Chandrasekhar