A dye mill has a highly colored wastewater with a flow of 32 million L/d. One suggestion has been to use biological means to treat this wastewater and remove the coloration, and a pilot study is performed.
Using a mixed-batch reactor, the following data result: Time (hours) Dye concentration (mg/L)
0 900
10 720
20 570
40 360
80 230
A completely mixed aerated lagoon (batch reactor) is to be used. How large must the lagoon be to achieve an effluent of 50 mg/L?
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