Laserfiche WebLink
M-1977-410 <br />Technical Revision 10 <br />April 26, 2022 <br />12 <br /> <br /> <br />Section 4: Selection Criteria for Pilot Treatment System <br /> <br />Graver Technologies (MetSorb©) bench-scale testing: <br />Upon failure of the OPEL pilot system and technical discussions with the manufactures of MetSorb© <br />HMRG proprietary adsorbent media. Metsorb© , GIR contacted and retained Graver Technologies to <br />conduct bench-scale testing of the untreated water effluent from the Cross-Caribou The media was <br />represented as having polymetallic adsorption capabilities and with a proven history of effectively treating <br />water from similar constituents. <br />Water samples filtered to 5 µm were sent by GIR to Graver’s facility in Glasgow, Delaware for scale bench <br />testing. Graver conducted kinetic and equilibrium bench-scale testing of MetSorb© adsorbent addressing <br />the removal of Cadmium, Zinc and other elements of interest present in the Cross Mine water. The results <br />of the testing and data analysis from Graver are provided in Appendix C <br />The results were satisfactory and therefore, GIR proceeded with the installation of the pilot system subject <br />of this Technical Revision. <br />Graver concluded the following (verbatim): <br />Graver has investigated the ability of MetSorb® HMRG to remove Cd and Zn from the water at the <br />Nederland mine Cross site. MetSorb® HMRG has a capacity of over 15 mg/g for Zn and over 0.14 <br />mg/g for Cd. The low concentration of Cd makes the HMRG kinetically hindered; a contact time of <br />10 minutes is not only practical but may be sufficient to remove the Cd. The kinetic data on Zn <br />removal shows that 40% of the Zn can be removed within 10 minutes. In a full-scale vessel, this <br />should be sufficient to remove a significant portion of the Zn from the Cross water. The major <br />recommendation of this report is that a pilot test be conducted. A pilot test with a lead-lag <br />configuration and appropriate sampling would provide a more complete evaluation of the media’s <br />ability to remove both Cd and Zn to the necessary requirements for the Cross site. <br />Based on the results of the May 2021 Filtration Study and the Metsorb© bench scale test results, GIR <br />engaged three companies, namely Ensero and Environmental Solutions Systems and Graber, to package <br />a pilot treatment system, mobilize and installed on site on priority basis. The system has been operational <br />on site since November of 2021. Details of the system are provided on Section 6.