14. Bench scale aeration test was performed on a sample of water evaluated for air stripping to remove VOCs. The target VOC is present in the water sample before aeration at 890 µg/L. The test data is given in the below table. Determine the order of the reaction. Show your work. Elapsed time of aeration (s) 15 30 45 65 90 120 Target VOC Effluent concentration (µg/L) 397 191 104 53 12 3
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- MPN of effluent is 10/100 ml and it reduces to 102/100 ml after chlorination. Find percentage removal (%R) and log removal (logR) of MPN.Q-ASP is used to treat a waste water flow of 2MLD having BOD5 of 250 mg/lit. The biomass concentration in the aeration tank is 2500 mg/lit and the concentration of biomass leaving the system is 80 mg/lit, the aeration tank has a volume of 200m³. Find the sludge age.A sample is diluted to perHorm test 295 mL distilled water are added to 5mL sample to fill 300ML BOD bottle. Inifial dissolved oxygen concentration is 7.9 mg/L in the bottle After mcubating 5 days, dissal ved oxygen carcentvation 1s 45 mg/L- Determine 5-day BOD OF the wastewae- Deoryge nation rate Constant, k, is C.013 day- Evaluate ultimate BOD Of the wastewCHer.
- Q2: Determine the resultant about the point O of the four forces and one couple which act on the plate shown in the Figure below. Note : for the resutant of 3osihys Forc es, You should computy the magnitude Kdirechion 30N 5 m- 3 ocos4s 25N 2 m 70 N-m 20N 40N o 307. The emissions from a stack were measured by collecting a sample on a filter. The sampler was operated for 15 minutes, had an inlet area of 12.5 cm2, an inlet velocity of 20 m/s, and collected 0.23 grams of PM. The stack gas had a temperature of 340 K, pressure of 1.018 atm, and volumetric flow of 245 scm/sec. Determine the PM concentration [ug/dscm], and the total rate of emissions [kg/day]. dscm: dry standard cubic meterA 1,200 gpm WTP is being designed for treating iron and manganese. The influent manganese concentration is 80 mg/L and the iron concentration is 90 mg/L. How much oxygen (mg/L DO) from aeration is needed for design? Assuming that aeration only removes 85% of Fe and Mn, how much potassium permanganate is needed (mg/L)? Design standards require 30 days of chemicals onsite. Assuming that the chemicals onside are dry, how many lbs of potassium permanganate are required? If the treatment plant is to operate two filter cells at a time, what is the required SA of each cell, assuming SOR of 2.5 gpm/sqft?
- Hello, I have an equalization tank with the following dimensions: Tank Dimensions: Height: 5.15 meters Length: 10.3 meters Width: 30.48 meters Total volume calculated: 1616.8116 m³ The design flow is 2.5 MGD. I want to treat the pH and alkalinity with soda ash. pH: 4.9 (desired: 7) Alkalinity [mg/L]: 44 mg/L (desired: 200 mg/L) How can I calculate how much soda ash I need to treat the pH and alkalinity in the equalization tank?Wet coal is dried in a continuous rotary dryer that operates at atmospheric pressure. The chips with a water content of 40 wt% and must leave with a moisture content of less than 15%. Hot air is fed to the dryer at a rate of 11.6 m (STP)/kg wet coal. HOT AIR MOIST AIR DRYER WET COAL DRIED COAL To monitor the performance of the dryer by sampling the exiting coal and determining their moisture content directly would be a cumbersome procedure and almost impossible to automate. Instead, wet- and dry-bulb thermometers are mounted in both the inlet and outlet air lines, and the moisture content of the exiting chips is determined by a material balance calculator. (STP: Standard Temperature and Pressure is 0*C and 101.325 kPa) (a) The hot air stream has an absolute humidity of 0.058 kg moisture/kg dry air and leaves with 0.087 kg moisture/kg dry air, calculate the mass of water in the exiting air per kilogram of wet coal fed. (b) Can the dryer reduce the wet coal moisture to 15%? If the answer…The 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 following test results (Table Ql-2) were obtained from a raw water sample. All of the tests were performed using a sample volume of 50 mL. Table Q1-2 Weight (g) Mass of residue after drying at 105 ỏC Mass of residue after ignition at 550 ¿C Mass of residue on Whatman GF/C filter paper after drying at 0.7148 0.3818 0.3571 105 'C Mass of residue on Whatman GF/C filter paper after ignition at 550 'C 0.1418 Calculate the concentration (mg/L) of : (i) total solids. (ii) total volatile solids. (iii) total suspended solids. (iv) total dissolved solids.Problem 8 Given L0,mix=12 mg/L, DO mix=DOsat=11.33 mg/L, kd=0.3 d-1, and kr =0.4 d-1, find the following: (a) Initial oxygen deficit (Do) (b) Critical time on the oxygen sag curve (tc) (c) Critical deficit (Dc)Liquid alum is delivered to a water treatment plant which contains 642.3 milligrams of alum per milliliter of liquid solution. Jar tests indicate that the best alum dose is 8 mg/L. Determine the setting on the liquid alum chemical feeder in milliliters per minute when the flow is 2.2 MGD.