Background and Aim: Discharge of industrial wastewater containing hexavalent chromium into the environment can have harmful effects to the types of organisms. So, chromium should remove before discharging to the environment with an effective method. The purpose of this study of is hexavalent chromium removed with Peganum harmala granular seeds(PGS).

  Materials and Methods: In this experimental study, The removal of hexavalent chromium with using PGS, with changes in time, pH, adsorbent dose, initial concentration of chromium and mixing speed was performed in the environment chemistry laboratory in Birjand University of Medical Sciences School of Public Health. Experiments were performed in batch reactor in flasks on Shaker. For chromium(VI) determine was used UV/VIS Spectrophotometer T80⁺ at a wavelength of 540 nm. Data were analyzed with Excel software.

  Results: The results of these experiments showed that the most removal of hexavalent chromium occurred in pH equal to 1.5 and optimum adsorbent dose was 10 grams per liter. Because of the active site of absorption is low. Increasing the initial concentration of chromium removal decreased with increasing initial concentration of Cr(VI). On the contrary, chromium removal efficiency increased with increasing of contact time and mixing speed.

  Conclusion: So, we can result the PGS remove hexavalent chromium from aqueous solution effectively.