The following data were obtained in a laboratory study conducted for the determination of the overallvolumetric mass transfer coefficient in a packed bed air stripping unit with a diameter of 1 m and a heightof 4m equipped with 4 equidistant sampling ports along its height. Contaminated groundwater containingan initial TCE concentration of 230 ug/1 was fed to the stripping column at 1 m³/m²-min. The air to liquidratio was 100. Based on the data determine Ka (s'). Henry's constant for TCE is 0.428.Depth, mTCE, µg/l234230140805030

Answered: The following data were obtained in a…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q2. A ring infiltrometer (inside area is 962 cm²) test was made on a soil with the results shown in the table below. Elapsed 10 20 30 60 90 150 time (Min) Wat.Vol 300 650 1190 1950 2500 3350 3900 4600 added since start c cubk cenembcr Determine the Horton's Infiltration equation.
al 2. Please design a Type II settling tank that receives a 1000 m3/day of a waste stream, after flocculation, that displays the following settling behavior. The initial concentration for this test is 500 mg/L. Time (min) 5 10 20 30 40 50 60 75 1 meters 2 meters 481 418 331 270 225 193 154 133 490 456 425 361 325 279 240 198 3 meters 495 483 463 413 369 333 290 259 Concentrations are in mg/L If the required removal rate is 50%, how large should the tank be?
Problem #7: A domestic sewage analysis was carried out for solid analysis. The test was performed using a sample size of 50 mL. Determine the concentration of total solids, total volatile and fixed solids, suspended, volatile suspended solids and fixed suspended solids. The information is as. Mass of empty evaporating dish = 53.5433 g; Mass of empty evaporating dish + residue after evaporation =53.5793 g; Mass of empty evaporating dish + residue after ignition =53.5742 g; Mass of empty filter =1.5433 g; Mass of filter after drying = 1.5553 g; Mass of filter at ignition = 1.5531 g. Problem #8: BoD, of sewage at 30°C is 120 mg/L. Determine its BoD; at 20°C. Problem #9: A sample of wastewater has a BoD; of 150mg/L at 20°C. The reaction rate at this temperature has been determined to be 0.23/day. Find out (i) The Ultimate Carbonaceous BOD. (ii) BoD; at 15°C and 25°C. (iii)Calculate BoD; remaining at 20°C.
Water analysis was carried out for solid analysis. The test was performed and the following information collected. Mass of empty dish = 51.5494 g; Mass of dish + Sample = 109.5 g; Mass of dish + dry solids =51.587 g; Mass of dish + ignited solid =51.541 g; Mass of empty filter = 0.1154 g; Mass of filter after drying = 0.1241 g; Mass of filter at ignition = 0.1160 g; Volume of sample =25 mL Compute the concentration of total solids, total volatile and fixed solids, suspended, volatile suspended solids and fixed suspended solids.
A BOD analysis was conducted on a partially- treated sewage at 25°C. Only 20% of the volume of BOD test incubator was filled with the sewage, and the dissolved oxygen values listed below were measured. Time Dissolved oxygen (mg/L) time O 1 2 3 4 5 6 Dissolved oxyen (mg/L) 8.5 7.7 6.5 4.8 3.5 ? ? By considering minimum dissolved oxygen at day 6 is valid for BOD test, determine the following: (i) Reaction rate K25. (ii) 25BOD5 from the drawn graph. (iii) 30BOD3. (iv) COD of the sample.
A primary clarifier is to be designed to treat a municipal wastewater. The influent to the clarifier has a flow rate of 7570 m³/d and a total suspended solids concentration of 320 mg/L. A laboratory settling test was performed with the following results: Suspended Solids Concentration (mg/L) at Given Depths Sampling Depth (m) Time (min) 0.61 1.22 246 2.44 272 243 1.83 3.05 10 230 262 282 20 157 195 230 253 30 115 160 211 221 230 45 90 134 163 179 195 60 48 102 131 154 170 90 29 58 86 115 141 (a) Determine the design overflow rate and detention time assuming 65% of the suspended solids are to be removed. Use typical scaling/safety factors as appropriate. (b) Determine the required diameter (to the nearest 0.1 m) and the required depth (to the nearest 0.01 m) for the clarifier.
Wastewater Engineering civil engineering (10)
Five-days BOD of a 10% diluted sample having Do = 6.7 mg/l, Ds = 2 mg/l and consumption of oxygen in blank = 0.5 mg/l, will be
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Find BOD5 @ 20degree and BOD3 @ 30 degree
2,13. Determine the suspcnded solids and the percent volatule matter in a sohds sample based on the following data: Sample size - 25 mL. Tare mass of filter 1.5325g Tare mass of filter plus retained solids-1.5415 g. Tare mass of filter plus retained ash-1.5378g
What diameter would a circular clarifier have to be to remove 50 μm particles with 75% efficiency from a 4 MGD (million gallon per day) flow? Assume the particle specific gravity is 1.5 and the temperature is 10°C. Answer: 18 m

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