4-6 A rancher needs to provide water for his cattle, but the only wa.docx

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4-6 A rancher needs to provide water for his cattle, but the only water source is a brackish well that has a total dissolved solids concentration (TDS) of 4800 mg/L. The cattle need 400 L/d of water with TDS < 1600 mg/L. The rancher has purchased a solar still that operates at 37 percent recovery of water (distillate) and 96 percent removal of dissolved solids. The rancher wants to recycle the blowdown from the still to a 20-m3 feed tank to maximize his freshwater recovery and minimize the waste that has to be hauled off, but the still cannot operate effectively above 52,000 mg/L TDS in the blowdown because of scaling problems. The system will operate as shown in the following diagram. a. Prepare a table showing the flow rate and concentration of TDS in the (i) well, (ii) still feed, (iii) distillate, (iv) blowdown, and (v) waste. Explain all assumptions you make. b. Propose a modification (i.e., using the existing equipment) that would decrease the waste that has to be hauled off, and determine how much reduction in waste flow this
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  • Fall '19
  • Total dissolved solids

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