The following test results were obtained for a treated wastewater sample: (a) Check the accuracy of the analytical measurements (7.5 marks) (b) Determine the mole fraction of Ca2+and HCO−3 (7.5 marks)
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a. The following test results were obtained for a wastewater sample taken at headwork’s to an industrial wastewater treatment plant. The samples used in the solid analysis were all either evaporated, dried or ignited to constant weight. The size of the sample used for the analysis was 150 mL. The laboratory data obtained are provided in TABLE Q1. Table Q1: Laboratory data on water analysis Item Weight, g Tare mass of evaporating dish 54.6423 Mass of evaporating dish plus residue after evaporation at 105°C 54.7173 Mass of evaporating dish plus residue after ignition at 550°C 54.6893 Tare mass of Whatman GF/C filter 1.5347 Mass of Whatman GF/C filter plus residue after drying at 105°C 1.5586 Mass of Whatman GF/C filter plus residue after ignition at 550°C 1.5454 Using the provided data, estimate the solid contents in terms of total solid (TS), total volatile solids (TVS), total suspended solids (TSS), volatile suspended solids (VSS) and total dissolved solids (TDS), volatile dissolved solids (VDS). [10 marks] b. For an unseeded wastewater Biological Oxygen Demand (BOD) test of 20.0 mL in a 200 mL bottle, the estimated initial Dissolved Oxygen (DO) and a 5-day DO are 9.8 mg/L and 6.3 mg/L respectively. Estimate the BOD and ultimate BOD (UBOD), if k = 0.10 per day. [6 marks] c. Interpret the significance of BOD as a measure for determining level of pollution in a water body. Outline the differences compared to Chemical Oxygen Demand (COD)? [4 marks]
Adi S.
Part D - Determination of water hardness in unknown sample Trial 1 Trial 2 Trial 3 Volume of unknown (mL) 25.00 25.00 25.00 Final Burette Reading (mL) 3.10 2.90 2.70 Initial Burette Reading (mL) 0.00 0.00 0.00 Volume of EDTA (mL) 3.10 2.90 2.70 Volume of EDTA used to titrate blank (mL) 0.50 0.90 0.05 Volume of EDTA required to titrate 25 mL of unknown sample (mL) 2.60 2.00 2.65 Moles of EDTA required to titrate 25 mL of unknown sample (moles) 2.65e-5 2.04e-5 2.70e-5 Moles of CaCO3 per 25 mL of unknown sample (moles) 2.65e-5 2.04e-5 2.70e-5 Weight of CaCO3 per 25 mL of unknown sample (g) 2.65e-3 2.04e-3 2.70e-3 Weight of CaCO3 per 106 mL of unknown sample (g) 106 81.6 108 Ppm of CaCO3 in unknown 106000 81600 108000 Average Ppm of CaCO3 in the unknown is 66733 +/- 31800 ppm 1. In reviewing the Ontario Drinking Water Standards, how does your unknown compare with the standard? How much calcium chloride or distilled water would be needed to be added to make your sample compliant? (2 marks) 2. Explain the process by which a water softener works, please include the regeneration process. (2 marks)
Anand K.
Help solve question c 1,2,and 3
Henry H.
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