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Sea Water DesalinationSlowsand/Nano/Seawater RO is the perfect treatment to remove salt and impurities from any ocean water without using any chemicals. This is a CWP patented system, no other company can legally supply this system. Because chemicals are not used, the minerals in the reject water can be harvested using solar evaporation and other techniques. The value of the minerals can used to offset the cost of the desalted seawater. The value of passing water through a biological slowsand filter to prepare the water for membrane filtration has been proven many times using Colorado River water, municipal wastewater and groundwater. The process was tested on ocean water in Catalina Island in a pilot project. It was found that the microbes living in the slowsand were as effective using seawater as it was using other types of water. By passing the ocean water through a slowsand filter there was a significant reduction in the turbidity and also a reduction of the Silt Density Index (SDI) . This as evidenced by the lack of fouling in the nanofilter over a six-month period. It was not necessary to clean the slowsand filter in the six-month period. The flow through the slowsand filter remained constant during the test. The slowsand filter was as effective in treating seawater as it was in treating Colorado River water where reduction of turbidities down to less than 0.02 turbidity units have been recorded. The nanofilter operated at 160 PSI on the seawater. The nanofilter removed all of the suspended organics and 90 percent of the dissolved organics, sulphates as well as the bivalent ions (Calcium and Magnesium), reducing the 33,000 PPM total dissolved solids by approximately 5,000 PPM. This caused a corresponding reduction of approximately 120 psi in the osmotic pressure required to remove the 28,000 ppm sodium chloride from the seawater. The sodium chloride is removed by using a high pressure 700 to 800 psi positive displacement pump. which is the product of the nanofilter. A catalytic conditioner which takes the carbon dioxide in the seawater and combines it with the calcium and magnesium to create calcite and magnetite. This is placed in front of the nanofilter membranes, the calcite and magnetite crystals pass from the system in the nanofilter reject. No scaling occurs in the nanofilters even at a 60 percent recovery. The carbon dioxide in the seawater is increased due to slowsand micro-organisms. The microbes use the oxygen and give off carbon dioxide which enhances the operation of the catalytic conditioner. The catalytic conditioner significantly reduces scaling. Anti -scaling chemicals are not needed. The reject water from the nanofilter contains approximately 2.5 to 3 times as much calcium and magnesium as the incoming sea water. The calcium, magnesium and trace minerals (approximately 80) of 60 to 70 percent the seawater is placed in 30 to 40 percent of the remaining seawater, which together make up the nano reject. This high calcium/magnesium/ trace minerals water can be solar evaporated and sold as organic sea-salt. The organic claim can be made because concentration by osmosis is a natural process. In fact all life is dependent on osmotic processes. Because the naturally fortified sea-salt is almost 3 times higher in calcium, magnesium and trace minerals content compared with the sodium content such sea-salt can demand a very good price in health food stores. The retail price is expected to be around $1.00 per ounce. Because the nanofilter has been preceded by a slowsand filter, the reject evaporated seasalt is a brilliant white in color. The reject from the seawater RO membrane produces 99 plus percent sodium chloride. Because the feed water has passed through the nanofilter membrane the salt can be labeled as purified salt. It would have a enhanced value for industrial purposes. It would make an excellent salt for water softeners or salt water swimming pools which are very popular. They use the salt in the swimming pools to make the chlorine. A conservative wholesale value of this salt would be $0.10 per pound. The production percentage using the Nan filtered purified water can be increased from the traditional 20 to 30 percent up to 50 to 60 percent depending on the TDS of the feed water and the desired TDS of the product. This high production reduces the energy requirement of the seawater RO together with the reduction of required pressure of 120 psi more than offsets the energy cost of operating the nanofilter. The production of seasalt from a 600 gpd nano RO system would be 200 pounds per day. There would be slightly less reject from the RO than the nano but the salt content would increase from 3.8% to 6 % so the amount of purified salt would be similar, about 200 pounds per day. The seasalt and purified salt from a 60,000 gpd unit would be 20,000
pounds each every day. It does cost to solar evaporate both types of salt
and place it in bags for shipment but the quality is there to make the
process cost effective, particularly in areas with low labor costs. |
Our Sea Water ProductsNEW!!!! The CWP SW100 - Our newest product for desalinating sea water reverse osmosis system. CWP 2808 Nano/Seawater RO System
Dr. Cluff's process is the most cost-effective way of converting seawater to bottled water quality while recovering saleable magnesium and sodium.
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Clean Water Products |
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