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For surface water system, the required residual disinfectant concentration may not be less than _______ mg/L for more than ___________ hours before the first customer.(a) 0.2, 6(b) 2.0, 6(c) 0.2, 4(d) 2.0, 4The question was posed to me in an interview for internship.Asked question is from Membrane Filter in division Building Blocks of Dairy Processing of Dairy Engineering

Answer»

Right option is (C) 0.2, 4

Best EXPLANATION: The residual DISINFECTANT CONCENTRATION required is equal to or more than 0.2mg/L. This should be applied 6 hrs before the 1st USAGE.



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