A pickle producing plant produces and discharges a waste brine solution with a s

Question

A pickle producing plant produces and discharges a waste brine solution with a salinity of 13,000 mg/L NaCl at a rate of 0.14 MGD into a stream. Before the discharge enters the stream, the flow rate of the stream is 1.2 MGD and the salinity is 20 mg/L. Assume that you can model this as a CSTR.

What is the concentration of the mixture of the stream and the discharge directly below the discharge point?

Directly below the discharge point is a prime fishing spot and the fish are intolerant to salt concentrations above 200 mg/L. How much salt should be removed per day from the plant effluent stream in order to maintain a concentration of salt < 200 mg/L in the stream mixture?

Explanation / Answer

a) C = (C1Q1 + C2Q2) / Q1 Q1 = 1.2 MGD, C1=20 mg/L-------> conc and the flow rate of the stream Q2= 0.14 MGD,C2=13000mg/L-------->conc and the flow rate of the plant put values C= 1376.119 mg/L b)C=200 mg/L get C2 C2 (new) = Q1(C-C1)/Q2 = 1542.857 mg/L now (13000-1542.857)Q2 = salt removed salt removed per day = (13000-1542.857)mg/L x 3.7854 x 0.14 x10^6 L/d =6071.8 Kg

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