摘要：The main objective of this study was to remove heavy metals from wastewater by two different wastewater treatment methods namely reverse osmosis and adsorption (Saudi bentonite clay as adsorbent) process. The concentration levels of heavy metals such as Co, As, Cd and Cr in wastewater in Riyadh were above the maximum recommended limits for crop production. The comparison showed that the minimum removal efficiency of heavy metal ions was 88.89% with adsorption process (Saudi bentonite clay) and 87.92% by Reverse Osmosis (RO) method. Moreover, the concentration level of the heavy metals in the treated wastewater was within the recommended permissible limits for crop production. The study provided an excellent potential for using local adsorbent material such as Saudi bentonite clay for wastewater treatment on economical basis.
