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i~' <br />TABLE 2 .. <br />PERFORMANCE OF THE BEACONSFIELD CRP PLANT <br />- Para meter <br /> <br />~ CN' ~'.~ : CN" <br />• SoIWIbn t't Free.-. •; Total srY_ ~ ~~ .~ ?n _ Au A9 <br /> _ _ <br />Feed Liquor 10-30 ~ 200 200 50-100 1-2 530 0.05-008 0.05-0.2 <br />Garified Liquor to Regeneration 110 115 <1.0 <1.0 <1.0 <1.0 0.08 <0.02 <br />Regeneration Dlscharpe 2.0 5.0 <1.0 <1.0 <1.0 <1.0 O.Od <0.02 <br />Aeration Dlscharpe 0.2-0.5 2-4 <1.0 <1.0 <1.0 <1.0 0.08 <0.02 <br />Carbon Cdumn Dlscharpe 0.1-0.3 1.2 <1.0 <1.0 <1.0 <1.0 0.01 <0.02 <br />t" All values In mg/I, unless otherwise stated. <br /> <br />~:: <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and total cyanide from actual decant water (Mudder, unpublished results).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 were conducted, <br />each usin0 200 camolae of decant water A summary of Influent and effluent chemistries before arxi after <br />cyanide recovery are presented In Tables 3 and 4. Greater than 99 cercent removal of total and WAD forms <br />of cyanide was realized, as well as excellent resr oxg.I__Q,t va[{Stu~metals iQl_lowing_pH adjustment and <br />recip results compared favorably with those obtained In the CANMET laboratory evaluations, <br />w is are presented In Table 5. The removal efficiencies for metals In the CANMET studies were excellent <br />and ranged Irom about 80-99 percent <br />.. TABLE 3 ~ ~ ~. _..~.;_~_~".. <br />CHEMICAL CHARACTERISTICS OF UNTREATED TAILINGS IMPOUNDMENT WATER <br />Parametert'A Concentration Ran <br />P"'....., ~... <br /> <br />Arsenic <br />Cadmium <br />Chromium <br />Cohort <br />- Copper 2.6 - 2.7 <br />.: _.. ~ IraR .- .. ~ _ <br />Lead 0.08 - 0.20 <br />Mercury 0.01 - 0.024 <br />Nickel - <br />S~ver 2.0 - 2.1 <br />Zinc 91.9 -96.4 <br />Thlocyanate 30.1 - 36.6 <br />Total Cyanide 310 - 34D <br />MethodL Cyanide 270 - 320 <br />Ammonia (as N) 19.0 - 19.6 <br />pH (in pH units) 10.4 - 10.5 <br />Pape 7 <br />Average Concentration <br />0.36 <br />0.01 <br />0.01 <br />0.21 <br />2.6 <br />16.0 <br />0.14 <br />0.016 <br />0.20 <br />2.0 <br />93.3 <br />33.6 <br />330 <br />294 <br />19.3 <br />10.4 <br />"' All concentrations In mg/I, unless otherwise stated. <br />~'~ All values are the result of direct analysts of the samples. <br />