efficiency of flocculant settling if tank depth is 3 m
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- QUESTION 4 A settling analysis is run on a Type 1 suspension in a laboratory column with a port of 1.9m below the suspension surface. The data obtained are shown below. Time (min) TSS (conc,mg/L) 0 220 3 116 5 98 10 75 20 35 40 10 60 2 What is the theoretical removal efficiency in a settling basin for an overflow of 440 m2/m.day?A concrete dam retains water to a height of 9 m. It has rows of sheet piling at both heeland toe which extend half way down to an impervious stratum. From a flow net sketchedon a transformed section, it is found that there are four flow channels and sixteen headdrops. The average horizontal and vertical permeabilities of the soil are 6 × 10^–3 mm/sand 2 × 10^–3 mm/s, respectively. What is the seepage in cubic meter per day, if the lengthof the dam is 150 meters?Calculate the number of settling tanks of 10 meters diameter that would be required to settle a raw water of 1795 m^3/hr given that the surface loading rate is to be 20m/d or less.
- A course sand sample is placed in the constant permeameter test. Water passes through the sample water with a constant head of 40cm and after 0.00167hr, 40grams of water have been collected. What is the coefficient of permeability of the sand in cm/sec if the sample is placed inside a 166cm container with a 7.89cm radius?5. The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/sec. Estimate the coefficient of permeability at a void ratio of 0.48. Using Casagandre equation Using Kozeny-Carman equation Find the difference in the rate of flow using the results of “a” and “b” if i = 0.70 and A = 0.6 m2.A rectangular sedimentation tank is designed with a depth of 3.5 mand a detention time of 1 h. Is the design suffcient to achieve complete removal of particles with a diameter of 0.01 mm? Specifc gravity of the particles is 2.65. The fow rate and temperature of waterare 10,000 m3/d and 20°C, respectively. At 20°C, density of water is998 kg/m3 and dynamic viscosity of water is 10–3 kg/m·s. State anyassumptions you make to calculate your results.
- Pumping test was carried out in a layer of soil extending to a depth of 28 m. The initial position of water table is located 4 m below the ground. Observation wells were sighted 33.5 m & 97.5 m from the pumping well. Water is pump at 248.4 m3/hr and when steady level was attained, the drawdowns at the observation wells were observed to be 1.1 m and 0.54 m, respectively. Compute the coefficient of permeability in m/day. CHOICES A. 64.82 m/day B. 71.49 m/day C. 71.49 m/day D. 78.09 m/dayWhat change in velocity would be necessary if the bed was to extend by 18%?(Giving Date: Sand media size: 3 mm, operating bed depth of 0.5 m and Minimum fluidization Velocity for sand filter used in wastewater treatmen= 4 m/s, density of sand media: 2000 kg/m3 and its porosity = 0.3)A 12m high circular tank with 45m radius contains oil weighing 9.4kN/m3. This tank stands over a 3m saturated sand layer (γsat = 18.88 kN/m3) underlain by a 14m thick clay layer (γsat = 17.30 kN/m3 , e = 1.27 and Cc = 0.40). Neglect weight of the tank. Assume no precompression has occurred. What is the difference between the settlement below the center and below the end of the tank?
- A settling tank has an overflow rate of 100,000 gal/ft^2 •d. Water carrying sediment of varioussizes enters the tank. The sediment has the following distribution of seIling velocities. What is the gravimetric percentage of sediment particles completely removed? (A) 32%(B) 39%(C) 47%(D) 55%pesign a rectangular sedimentation tank to treat 120000 m3/day flows. ssume the SOR=30 m/day, L= 32 m, LW-4:1. D.T-3hr?The discharge of water collected from a constant head permeameter in a period of 15 minutes is 500 ml. The internal diameter of the permeameter is 5 cm and the measured difference in head between two gauging points 15 cm vertically apart is 40 cm. Calculate (a) the coefficient of permeability (mm/s), (b) If the dry weight of the 15-cm long sample is 4.86 N and the specific gravity of the solids is 2.65, calculate the seepage velocity (mm/s).
