Eco-Friendly Innovation for Electrical Conductivity Reduction of Persian Gulf Seawater Using Highly Efficient Recyclable Sorbent

The use of seawater containing Reverse Osmosis effluent is very serious for the daily living of the coastal residents, especially for farmers. In this study, a one-year field test was carried out for electrical conductivity reduction of Persian Gulf seawater in Iran, during ۲۰۱۷ and ۲۰۱۸. The test was conducted in two filters each with a diameter ۲.۵ cm (or ۰.۰۲۵ m) and ۱۸.۵ cm (or ۰.۱۸۵ m). In the filters, crumb mineral mussel was used as one of the main components of filter materials. The minor components of filter materials were comprised of coarse-grained gravel, fine-grained activated carbon, and fine-grained sand. The well water as low-saline water for the background of seawater treatment and seawater as super-saline water were treated. The test was performed as the pilot, batch, and column design with three replicates. The volume of daily treated seawater and the efficiency of reduction of electrical conductivity and salinity were determined. The volume of treated seawater by each of the filters was at least ۱۰ times the diameter of each of those. The maximum reduction efficiency of electrical conductivity and salinity in a filter with ۲.۵ cm (or ۰.۰۲۵ m) diameter was ۹۷.۰۹% (from ۸۵.۲ to ۲.۴۸ mS/cm or from ۸.۵۲ to ۰.۲۴۸ S/m) and it was ۹۸.۲% (from ۶۱ to ۱.۱), respectively. Maximum reduction efficiency of the parameters in filter with ۱۸.۵ cm (or ۰.۱۸۵ m) diameter was ۹۷.۵% (from ۸۴.۸ to ۲.۱۲ mS/cm or from ۸.۴۸ to ۰.۲۱۲ S/m) and it was ۹۷.۶۹% (from ۶۰.۷ to ۱.۴), respectively. Electrical conductivity in outlet water from filters was less than ۳ mS/cm (or ۰.۳ S/m), below the permissible limit recommended by World Health Organization and also the Iranian Department of Environment for agriculture and irrigation usage. Based on these results a non-continuous method seems promising in the biological growing phase in filters.

کلیدواژه ها:

Bio-filtration ، Desalination ، Electrical conductivity reduction ، Seawater treatment