Methods for removing arsenic include chemical precipitation, adsorption, electrocoagulation, and biological arsenic removal.
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1. Chemical precipitation method The arsenic is directly precipitated by insoluble arsenate and arsenite by adding a chemical to the wastewater. FeSO 4 —FeSO 4 •7H 2 O or FeCl 3 , Na 2 S, CaO, NaOH, etc. may be added to the acidic wastewater, and FeCl 3 , Al 2 (SO 4 ) 3 , CaO or the like may be added to the alkaline wastewater.
2. Adsorption of arsenic wastewater by addition of an adsorbent such as ion exchange resins or activated carbon, activated alumina, acidic terra alba, aluminum silicate, arsenic is adsorbed onto the surface of a solid having an active, to arsenic removal the goal of. In addition, sodium hydroxide, hydrochloric acid or the like can also be used as a conditioning agent for adjusting the pH of the solution.