In standardization, 10.00 mL of Naz C2 04 solution required 39.17 mL of KMN04. Find the molarity of KMNO,. The unknown required 14.44 mL of MnO,. Find Ca in the urine. (Answer: 1.086 x 10 M, 7.840 x 10 M)
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- 3. Circular clarifiers are used to remove solid materials from water. They allow continuous treatment of water and can handle fairly large flows. Solids settle to the bottom of the clarifier and are carried away by a small stream of water (the waste stream). Most of the water exits the tank as treated effluent. Assume a clarifier receives a flow of 0.10 m3/s with a solid concentration of 800 mg/L. If the waste stream consists of 3% of the incoming flow and carries 90% of the incoming solids, a) what is the solids concentration in the waste stream, and b) what is the solids concentration in the treated effluent?For the measurement of the BOD of a wastewater sample from textile industry, five different dilutions (0.5%, 1%, 2%, 5% and 10%) of 1 L are prepared, with the addition of 2 mL of seed. Three different dilutions (0,5%, 2% and 5%) are used for seed corrections. The results of DO measurements are given below. Calculate the BOD5 concentration of the sample.-4 2.LacticacidhasaKa of1.38x10 . What is the pH of the solution that results when 25.0 mL of 0.300 M lactic acid are titrated with 20.0 mL of 0.375 M KOH?
- A tank is initially filled to capacity with 300 L pure water. At t=0, brine containing 2 g/L salt is pumped into the tank at a rate of 25 L/min. The well-mixed solution is pumped out at a larger rate of 50 L/min. Determine the concentration of the salt inside the tank after 5 min. Use dQ/dt = ci vi - co vo as a formulaA tank has a total capacity of 100L, but initially it contains 15L of pure water. Water flows into the tank 8L per min and contains 2kg of salt. The solution in the tank is being mixed well. If the well mixed solution in the tank exits 7L per minute, determine the amount of salt in the solution just before the tank overflowsThe results of a jar test on a surface water supply sample revealed that the optimum dose of alum (Al2(SO4)3.14H2O) as coagulant is 17 mg/L. Furthermore, the water has total alkalinity = 50 mg/L as CaCO3; pH = 7.8; and residual turbidity at optimum alum dose = 4 NTU. The water treatment plant has a mean flow of 10m3/hour. Determine: The kg of alum per year needed in the operation of the plant. The residual alkalinity in the sample, following the addition of alum at optimum dose. Solve parts (a) and (b) if instead of alum, ferric chloride (FeCl3) were used as coagulant. Assume the numerical jar test results are the same as those with alum.
- The BODs of a domestic wastewater sample is considered to be about 200 mg/l and the DO in it is measured as 0 mg/L. The laboratory staff are preparing to set up a BOD test to determine the actual BOD of the sample. The DO of the dilution water was measured to be 9 mg/I. Which of the following volume ratios of (total volume of BOD bottle = 300 mL) / (volume of wastewater sample) would be most appropriate to use in setting up the BOD bottle for incubation? Select one among the following: (a) 20/1; (b) 50/1; (c) 100/1; (d) 500/1. Justify your selectionGiven:Flow rate of water = 500 L/minSuspended solids concentration in influent water = 100 mg/LRequired effluent suspended solids concentration = 10 mg/LFiltration rate = 10 m^3/m^2/hrFiltration tank dimensions: Length = 5 m, Width = 3 m, Depth = 4 mCalculate:o Calculate the total suspended solids (TSS) load in the influent water:o Calculate the filtration tank surface area:o Calculate the required filtration tank capacity:o Calculate the required detention time in the filtration tank: Q2) DisinfectionGiven:Flow rate of water = 2000 m^3/hChlorine residual required in effluent = 0.5 mg/LInitial chlorine concentration in influent water = 2 mg/LChlorine decay rate in disinfection tank = 0.05 per hourDisinfection tank volume = 300 m^3Calculate:o Calculate the chlorine demand in the influent water:o Calculate the chlorine dosage required:o Calculate the chlorine dosage rate:o Calculate the actual chlorine dosage rate considering chlorine decay:A BOD analysis was performed on a municipal wastewater. The 300 mL test bottle was filled with 2.0% wastewater mixed with dillution water, The initial dissolved oxygen (DO) was 8.3 mg/L. The sample is then put in a incubator and set at 20°C. Since the 5th day falls on public holiday, the final DO does not get measured until the 7th day. The final DO is measured at 4.5 mg/L. Assuming k30 (base e) is 0.2/day, determine the BOD3 @ 20°C BOD5 @ 30°C
- Suppose the estimated BOD of an influent sample is expected to be 150 mg/L and the dissolved oxygen concentration of the oxygen saturated dilution water used in the BOD test is 8.5 mg/L. If you are using a 300 mL BOD bottle, estimate the maximum and minimum amount of sample you would add to the BOD bottle to ensure satisfactory test results. NOTE: Acceptable BOD test should comply with the two essential criteria: DO final ≥ 2 mg/L and DO initial – DO final ≥ 2 mg/L. Assume that the dilution water is the only source of oxygen.A 5-day BOD test if performed on an industrial wastewater sample that contains no bacteria; therefore, a "seeded" BOD test is run. Ten ml of "seed" are added to 20 liters of dilution water. Thirty milliliters of industrial wastewater are added to a 300-ml BOD bottle, and the remaining volume consists of "seeded" dilution water. The average dissolved-oxygen concentrations of the diluted wastewater samples and blanks (seeded dilution water) on the first day of the test were 7.5 mg/L and 9.0 mg/L, respectively. After incubation of separate BOD bottles at 20 C for 5 days, the average DO concentrations of the diluted wastewater BOD bottles and seeded dilution water BOD bottles were 3.1 and 8.5 mg/L, respectively. Calculate the 5-day BOD of the industrial wastewater. I am unsure of how to solve for f given this information, where f = (% seed in D1) / (% seed in B1)A 100-mL water sample is mixed with 200 mL of deionized water for BOD analysis. The DO of the mixture is 8.2 mg/L. The DO after 5 days is 4.9 mg/L. What is the BOD of the water sample?