Contribute to the Removal of Mg2+ From the Brine Produced by Reverse Osmosis Units Using Na3PO4
Keywords:
reverse osmosis, brine, calcium ionsAbstract
Desalination by reverse osmosis generates a stream of fresh water and approximately an equivalent volume of highly concentrated brine as waste. The waste brine is usually dumped back into the sea which increases the sea`s salinity in a way that can affect marine life. In this context, the current study demonstrates the possibility of removing magnesium ions from the brine solution produced by reverse osmosis units, where the optimal conditions for precipitation of Mg+2 magnesium ions were studied using trisodium phosphate at a temperature of T = 20 ± 5 Co and a pH =[8.5-9.4] corresponds to the output water. The research results indicate that when the ratio is: 10= we get a removal (95.9-97.3)% of magnesium ions, by adopting a mixing time of one hour, where the sedimentation is maximum and corresponds to the balance of the two-phase system. The changes in calcium removal were studied in the presence of magnesium ions, where the removal yield decreased with the increase of magnesium ions in the solution, and it also led to the removal of the total hardness of the water by (92.6-97)% and the conversion of excessively hard water into soft water using trisodium phosphate, in addition to that the formed precipitate can be converted into fertilizer for plants by way to recycle it.
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