Consequently, in addition to the recognised issue with deficiencies of major ions in the distillate, a potential for Mn toxicity was also identified. 3.5.2 Distillate Distillate growth Control growth rate compared to TIE test Treatment rate (mean (mean day-1 ±SE) control (mean % ±SE) ± SE) Calcium addition 0.0 mg L-1 Ca 0.14 ± 0.00 0.00 ± 0.00 0.0 added 0.2 mg L-1 Ca 0.27 ± 0.01 0.16 ± 0.00 61 ± 2 added 0.5 mg L-1 Ca 0.28 ± 0.00 0.18 ± 0.01 66 ± 5 ion addition 0.0 mg L-1 Ca, 0.04 ± 0.06 0.13 ± 0.01 353 ± 23 a Na and K added 0.2, 0.5 and 0.2 mg L-1 Ca, 0.29 ± 0.02 0.29 ± 0.01 100 ± 4 Na and K added 0.5, 1.0 and 0.4 mg L-1 Ca, 0.34 ± 0.01 0.32 ± 0.02 96 ± 5 Na and K added Growth rate in the distillate was three times higher compared to SSW with no major ions, but was still a significantly lower than distillate with major ions added. In conclusion, although the brine concentrator distillate was of hugely improved quality compared with the feed process water, it may still have the potential to impact some species inhabiting the receiving environment if it was the dominant component. The most likely negative effect relates to deficiency of essential major ions. However, the lack of major ions may also exacerbate the toxicity of other components present at low levels. The results of the tests reported here are for distillate produced from an off site pilot plant. ERA has indicated that it is likely the distillate from the full-scale plant will contain less trace components than the pilot plant since it will have much lower carryover of spray droplets with the condensate. The following key recommendations have been made in relation to management of the distillate and further assessment of its properties: 1 Supplementation of the distillate with trial ions (Ca, Na and K) may be required prior to its discharge to the off-site aquatic environment;
Consequently, in addition to the recognised issue with deficiencies of major ions in the distillate, a potential for Mn toxicity was also identified. 3.5.2 TIE test Treatment Control growth rate (mean day-1 ±SE) Distillate growth rate (mean ±SE) Distillate compared to control (mean % ± SE) Calcium addition 0.0 mg L-1 Ca added 0.14 ± 0.00 0.00 ± 0.00 0.0 0.2 mg L-1 Ca added 0.27 ± 0.01 0.16 ± 0.00 61 ± 2 0.5 mg L-1 Ca 0.28 ± 0.00 0.18 ± 0.01 66 ± 5 ion addition 0.0 mg L-1 Ca, Na and K added 0.04 ± 0.06 0.13 ± 0.01 353 ± 23 a 0.2, 0.5 and 0.2 mg L-1 Ca, Na and K added 0.29 ± 0.02 0.29 ± 0.01 100 ± 4 0.5, 1.0 and 0.4 mg L-1 Ca, Na and K added 0.34 ± 0.01 0.32 ± 0.02 96 ± 5 a Growth rate in the distillate was three times higher compared to SSW with no major ions, but was still significantly lower than distillate with major ions added. In conclusion, although the brine concentrator distillate was of hugely improved quality compared with the feed process water, it may still have the potential to impact some species inhabiting the receiving environment if it was the dominant component. The most likely negative effect relates to deficiency of essential major ions. However, the lack of major ions may also exacerbate the toxicity of other components present at low levels. The results of the tests reported here are for distillate produced from an off site pilot plant. ERA has indicated that it is likely the distillate from the full-scale plant will contain less trace components than the pilot plant since it will have much lower carryover of spray droplets with the condensate. The following key recommendations have been made in relation to management of the distillate and further assessment of its properties: 1 Supplementation of the distillate with ions (Ca, Na and K) may be required prior to its discharge to the off-site aquatic environment; trial
ssd-annual-report-11-12.docx