Calculate the pH of a 1.6 M Ca(OH)2 aqueous solution. O 14.2 O 14.5 O 13.8 O 13.5
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- An activated sludge plant with recycle is evaluating its secondary clarification system. Settling column tests are conducted and analyzed for settling velocities at different initial solids concentrations. The data are provided below. The plant flow rate is 10,000 m3/d, with a recirculation ratio of 0.5. The MLSS in the reactor is 4000 mg/L. The desired underflow concentration is 17,000 mg/L. Solids concentration mg/L Settling velocity m/h 1500 6.5 3000 5.1 4500 4 6000 2.95 7500 2 9000 1.4 12,000 0.5 15,000 0.27 17,000 0.2 a. Calculate the required surface area if one clarifier is used. b. Calculate underflow rate, underflow velocity, and overflow rate for single clarifier design. Clearly state your assumptions. c. Calculate the required surface area if two clarifiers are usedCalculate "exact" alkalinity of the water containing 130 mg/L of bicarbonate ion, 25.00 mg/L of carbonate ion and the pH is 9.3a) An activated sludge plant with recycle is evaluating its secondary clarification system. Settling column tests are conducted and analyzed for settling velocities at different initial solids concentrations. The data are provided below. The plant flow rate is 10,000 m3/d, with a recirculation ratio of 0.5. The MLSS in the reactor is 4000 mg/L. The desired underflow concentration is 17,000 mg/L. Solids concentration mg/L Settling velocity m/h 1500 6.5 3000 5.1 4500 4 6000 2.95 7500 2 9000 1.4 12,000 0.5 15,000 0.27 17,000 0.2 b) Design secondary clarifiers for the activated sludge plant of problem a), with a recycle ratio of 0.6. Calculate the required surface area if two clarifiers are used. Also calculate underflow rate, underflow velocity, and overflow rates. Clearly state your assumptions.
- Calculate the minimum fluidization velocity for an anthracite bed having following characteristics; d90 = 2.9 mm, ?anthracite = 1600 kg/m3, ?water = 998 kg/m3 at 20°C; µ = 1.002x 10-3 kg/m.secFree settling rate of a sludge is 0.25 cm/min. Using an original height of 25 cm, the sludge settledto a height of 18 cm after the free‐settling period. The sludge was found to settle to a height of10 cm after 110 min. This particular sludge was found to settle completely to a height of 4 cm.Calculate the time to settle to a height of 1/5 of its original height in a cylindrical tank whosediameter is 85% of its depth if it is 85% full. Consider 100 cubic feet of sludge in the tank.The steady state recharge rate from Problem 2 is q = -0.66 meters/day
- An open cylindrical tank contains 1.2 m of salt water (sp.gr = 1.03), 0.9 m of gasoline (sp.gr = 0.70) and 1.2 m ofoil (sp.g r= 0.85).1. What is the pressure 1.5 m below the liquid surface?Angela wants to determine the permeability of an aquifer. The aquifer has a test well 300-mm in diameter with two observation wells. A pumping test was conducted for 24 hours with the discharge being held constant at 6337.3 m^3/day. The first one, 85.91 meters from the test well, has a draw-down of 0.88 meters. The second one, 43 meters from the test well, has a draw-down of 1.49 meters. The static water table penetrates the well to a depth of 29 meters. Determine the radius of influence of the aquifer in meters.The 550-bed Atlanta Hospital has a small, activated sludge plant to treat wastewater from the hospital. The average daily hospital discharge is 1.50 m3 per day per bed, and the average soluble BOD5 after primary settling is 450 mg/L. The aeration tank effective liguid dimensions of 10 m x 10 m x 5 m. The plant operating parameters are as follows: MLVSS - 2,600 mg/L; MLSS - 1.20 (MLVSS); Settling sludge volume after 30 min. = 200 mL/L. The aeration time is nearly?
- The 550-bed Atlanta Hospital has a small, activated sludge plant to treat wastewater from the hospital. The average daily hospital discharge is 1.50 m3 per day per bed, and the average soluble BOD5 after primary settling is 450 mg/L. The aeration tank effective liguid dimensions of 10 m x 10 m x 5 m. The plant operating parameters are as follows: MLVSS - 2,600 mg/L; MLSS - 1.20 (MLVSS); Settling sludge volume after 30 min. = 200 mL/L. The F/M ratio is nearly?Determine the exact and approximate alkalinity of a water sample that contains 120.0 mg/L of (CO3)^2- and 75.0 mg/L of (HCO3)^- at a pH of 9.7 at 25 degrees CelciusA small lake with volume 20.0*10^3 m^3 has no natural pollutant sources. However, a sewage pipe discharges sewage containing a pollutant into the lake. Conditions in the sewage pipe are Qs=0.5m^3/s and Cs=100.0mg/L. The polutant is destroyed in the lake with a first-order rate constant of 0.20/day. THe flow rate out of the lake in 5.0 m^3/s. Assume that the lake is well-mixed. a) Calculate the steady-state pollutant concentration in the lake. b) What is the retentiont time for this lake?