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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
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 The cattle need of water with TDS The rancher has purchased a solar still
that operates at percent recovery of water distillate and percent removal of dissolved solids. The rancher wants to recycle the blowdown from the still to a feed tank to maximize his freshwater recovery and minimize the waste that has to be hauled off, but the still cannot operate effectively above 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 ie using the existing equipment that would decrease the waste that has to be hauled off, and determine how much reduction in waste flow this modification would achieve.
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