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FlocculationHW

# FlocculationHW - ENV 6015 Mixing Precipitation Problem Set...

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ENV 6015 Mixing & Precipitation Problem Set 1. Determine the lime-soda dose required to soften the following water to the stated goals in lbs/mgal. Determine the lbs/mgal of sludge produced, the actual pH and pH s of the treated water and the amount of H 2 SO 4 or CaO in lbs/mgal if any adjustment of pH to pH s is necessary. Predict the change in TDS. Water quality Goals TH = 200 mg/l CaCO 3 TH < 100 mg/l CaCO 3 MgH = 70 mg/l CaCO 3 Mg < 40 mg/l CaCO 3 Alk = 350 mg/l CaCO 3 pH > pH s pH = 6.5 TDS = 310 mg/l CaCO 3 2. An alum dose of 120 mg/l Al 2 SO 4 . 14 H 2 O is used to remove color from the following water. Trace colors remaining after coagulation is 16 cpu which is reduced to less than 5 cpu during chlorination by a dose of 20 mg/l as cl. Determine the pH of the coagulation reaction, the pH after chlorination and how much CaO would be required to adjust the pH after chlorination to pH s . Predict the change in TDS. Water quality TH = 80 mg/l CaCO 3 Mg + = 20 mg/l CaCO 3 Alk = 60 mg/l CaCO 3 pH = 7.1 TDS = 150 mg/l 3. Calculate the root-mean-square velocity gradient (mixing intensity) G, and the detention

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FlocculationHW - ENV 6015 Mixing Precipitation Problem Set...

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