1) The following test results were obtained for primary influent to the UCD wast
ID: 573578 • Letter: 1
Question
1) The following test results were obtained for primary influent to the UCD wastewater treatment plant. Determine the concentration of (a)total solids, (b) total volatile solids, (c) suspended solids, (d) volatile suspended solids and (e) total dissolved solids. Based on this analysis, are the solids in the wastewater primarily organic or inorganic? What can you say about the size of the solids in this wastewater? Total solids test (20 ml sample Tare mass of sample pan = 0.99187 g Pan plus residue after evaporation at 105 °C = 1.00549 g Pan plus residue after ignition at 550 °C 1.00186 g Filtered solids fest(50 ml sample Tare mass of Whatman GF/C filter-1.05501 g Residue and filter after drying at 105 °C-1.06171 g Residue and filter after ignition at 550°C = 1.05626 gExplanation / Answer
1) Total solids = Pan plus residue after evaporation at 105 C - Tare mass of sample pan/ Sample size
Total solids = 1.00549 - 0.99187 / 0.02
Total solids = 0.01362 X 103 mg/ g/ 0.02 = 0.681 mg/l = 681 mg/L
2) Total volatile solids = Pan plus residue after evaporation at 105 C - Pan plus residue after ignition at 550 C / sample size
VS = 1.00549 - 1.00186 X 103 mg/ g/ 0.02 = 0.00363/ 0.02 = 181.5 mg/L
3) Total suspended solids = Residue and filter after drying at 105 C - tare mass of Whatmann GF/C filter / Sample size
TSS = 1.06171 - 1.05501 X 103 mg/ g/ 0.50 = 0.0067 / 0.50 = 13.4 mg/L
4) Volatile suspended solids = Residue and filter after drying at 105 C - Residue and filter after ignition at 550 C / sample size
VSS = 1.06171 - 1.05626 X 103 mg/ g/ 0.50 = 0.00545/ 0.50 = 10.9 mg/L
5) Total dissolved solids = Total solids - total suspended solids = 681 - 13.4 = 667.7 mg/L
After seeing this analysis we can say that solids in the wastewater is inorganic.
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