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1 ..-. <br />1 ~ <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br />1- <br />~~. <br /> <br />1 <br /> <br /> <br /> <br /> <br />.. <br /> <br />Page 7 <br />TABLE 2 <br />PERFORMANCE OF THE BEACONSFIELD CRP PLANT <br />- Para meter <br /> Cfr ,; r. Cfr <br />- Solutibnt0 Free. ~.IQlgl ~_. ~~ ~L Zn Au Ag <br /> .. - <br />Feed Liquor 1030 200 200 50.100 1-2 530 0.05-0.08 0.05-0.2 <br />Clarified Liquor to Regeneration 110 115 <1.0 <1.0 <1.0 <1.0 0.08 <0.02 <br />Regeneration Discharge 2.0 5.0 <1.0 <1.0 <1.0 <1.0 0.08 <0.02 <br />Aeration Discharge 0.2-0.5 2-4 <1.0 <1.0 <1.0 <1.0 0.08 <0.02 <br />Carbon Cdumn Discharge 0.1-0.3 1.2 <1.0 <1.0 <1.0 <1.0 0.01 <0.02 <br />"' All values In mg/I, unless otherwise stated. <br />Similar results were obtained In the pilot scale batch studies evaluating the removal and recovery of WAD <br />and total cyanide from actual decant water (Mudder, unpublished results). Repeated trials wereiconducted, <br />each using 200 L samples of decant water. A summary o} Influent and effluent chemistries betc~re and after <br />cyanide recovery are presented In Tables 3 and 4. Greater than 99 percent removal of total andIWAD forms <br />of cyanide was realized, as well as excellent removal of various metals fdlowing pH adjustment and <br />precipitation. The results compared favorably with those obtained In the CANMET laboratory evacuations, <br />which are presented In Table 5. The removal etticiencles for metals In the CANMET studies were excellent <br />and ranged from about 80-99 percent. <br />TABLE 3 <br />CHEMICAL CNARACTERISTiCS OF UNTREATED TAILINGS IMPOUNDMENT WA'(ER <br />Parameter r'•~ <br />Arsenic <br />Cadmium <br />Chromium <br />Cobalt <br />Copper <br />Iron <br />Lead <br />Mercury <br />Nickel <br />Silver <br />Zinc <br />Thlocyanate <br />Total Cyanide <br />Method-C Cyanide <br />Ammonia (as N) <br />Concentration Rangg Average Concen)ration <br />------ 0.36 <br />--- 0.01 <br />----- 0.01 <br />----- 0.21 <br />2.6 - 2.7 2.6 <br />--- 16.0 <br />0.08 - 0.20 ` ~ 0.14 <br />0.01 - 0.024 0.016 <br />----- 0.20 <br />2.0 - 2.1 2.0 <br />91.9 -96.4 93.3 <br />30.1 - 36.6 33.6 <br />310 - 340 330 <br />270 - 320 294 <br />19.0 - 19.6 19.3 <br />10.4 - 10.5 10.4 <br />r'r All concentrations In mg/I, unless otherwise stated. <br />r'~ A11 values ere the result of direct analysis of the samples. <br />