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Privileged and Confidential—Attorney Client Communication G eosyntec° <br /> Consultants <br /> Source Water 1. The test consisted of six jars representing different conditions to test <br /> the ability of a potassium permanganate dose, the addition of a ferric coagulant, and <br /> aeration on the removal of metals, with a focus on manganese. Mixing speeds and the <br /> ferric chloride coagulant dose were set based on previous jar testing results. A summary <br /> of the conditions in each jar is shown in Table 8. <br /> Table 8: Manganese Removal Jar Testing Summary <br /> 15 mg/L 30 mg/L 45 mg/L 15 mg/L Aeration Aeration <br /> KMnO4 KMnO4 KMnO4 KMnO4 and 10 <br /> plus 10 mg/L Fe <br /> mg/L Fe <br /> The steps performed for the jar test are listed below. <br /> • Characterize constituents of initial source water(total metals, dissolved metals, <br /> turbidity, pH,temperature) <br /> • Adjust pH between 8-9 <br /> • Add KMnO4 or begin aerating based on the experimental plan in Table 8 <br /> • Add coagulant for jars 4 and 6 <br /> • Slow mix for 30 minutes at 30 rpm <br /> • Let the jars settle for 30 minutes <br /> • After one hour, collect the following: <br /> o Total metals and dissolved metals samples for inductively coupled <br /> plasma mass spectrometry(ICP-MS) evaluation <br /> o Dissolved metals samples for evaluation using Hach Kits <br /> o Turbidity,pH, and temperature <br /> o For Jars 2 and 4, collect samples to be centrifuged for evaluation of <br /> colloidal/nanoparticulate manganese oxides using Hach Kits <br /> 2.2.4 Bench-Scale Adsorptive Media <br /> The third phase of jar testing evaluated various adsorptive media, i.e.,biochar, zeolite, <br /> and GAC, as a potential pre-treatment step to remove metals, or as a polishing step after <br /> the bioreactor to remove organics, BOD, and other potential constituents that could <br /> periodically be found in the bioreactor effluent during challenged conditions. The pre- <br /> treatment test consisted of one biochar and two zeolites added to a 1 L Erlenmeyer flask <br /> with Source Water 1. The polishing step test consisted of one biochar and two GACs <br /> added to a 1 L Erlenmeyer flask with the bioreactor effluent(B2) water. In both tests, <br /> Treatability Testing Report 12 December 11,2018 <br />