Question An effluent at a flow rate of 2670 m³/d from a sewage treatment plant is to be disinfected. The laboratory data of disinfection studies with a chlorine dosage of 15 mg/l yield the model N₁-Noe™ 0.145t where N₁= number of micro-organisms surviving at time t (in min.) and No= number of micro- organism present initially (at t=0). The volume of disinfection unit (in m³) required to achieve a 98% kill of micro-organisms is_

Question An effluent at a flow rate of 2670 m³/d from a sewage treatment plant is to be disinfected. The laboratory data of disinfection studies with a chlorine dosage of 15 mg/l yield the model N₁-Noe™ 0.145t where N₁= number of micro-organisms surviving at time t (in min.) and No= number of micro- organism present initially (at t=0). The volume of disinfection unit (in m³) required to achieve a 98% kill of micro-organisms is_

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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3. A waste water contains 67 mg/l of glucose (C6H₁2H6). Since glucose is completely biodegradable, the ThOD and BOD are same. The first order biodegradation rate constant for removal of BOD is given by 0.06/hr (ka). BODt = BODu (1-e-kdt). After 5 hours during the BOD test, glucose concentration was found to be 22 mg/L. If you assume that all carbon is converted to carbon dioxide, find the BOD leftover after 5 hours of incubation. 4. Determine the density of Air at 84° F and 1 atm pressure. Assume laws of ideal gases holds.
Read the question carefully and give me all right solutions. If you don't know the solution please leave it but don't give me wrong solution. If the initial dissolved oxygen of a 3 mL sample is 7.5 mg/L and after day 5 is 5.5 mg/L, with a k rate determined to be 2 mg/L. what is the BOD5 ? Ultimate BOD ? BOD 2 ? BOD 10? . Create a BOD graph (time vs BOD) .
3. Table below shows the concentration of dissolve oxygen for a BOD test, diluted by 100. Time (days) Diluted sample DO (mg/L) 7.95 1 3.75 2 3.45 2.75 2.15 1.8 i. Determine BOD5 Given the deoxygenation rate coefficient of 0.15 day-1, determine the ultimate BOD ii. iii. Based on answer from (i), identify class of the water sample based on INWQS guideline and propose suitable usage the water.
BOD of a wastewater sample is determined by incubating the BOD bottles at four different temperatures, 5, 15, 20, 35, and 50°C. i The ultimate BOD of the sample incubated at 10°C would be-----compared to the sample at 50°C. ii. The reaction rate constant, k for sample incubated at 35°C would be- compared to the sample incubated at 5°C
H Gy Q#4:The table shows data of a wastewater sample collected from a river with a temperature of 30 °C analyzed for the BODs test. The rate constant is 0.2 day-¹ at the lab temperature (20 C). Find BODs at the river. Initial dissolved oxygen, mg/L 9 What will be the BOD7 at the river? Final dissolved oxygen, mg/L 3.5 Sample volume, ml 35
188 RIVERS AND STREAMS 4.10. Fifteen kilograms of a contaminant is spilled into a stream 4 m wide and 2 m deep. (a) If the average velocity in the stream is 0.8 m/s, the longitudinal dispersion coefficient is 0.2 m/s, and the first-order decay constant of the contaminant is 0.05 h-1, determine the maximum concentration in the stream at a drinking-water intake 1 km downstream from the spill. (b) How would this concentration be affected if the decay constant is actually one- half of the estimated value?
A potable water containing 104 CFU/100 ml of total Coliform will be disinfected using calcium hypochlorite Ca(OCI)2. The change of chlorine concentration by time for this potable water is given in Figure below. For the potable water, the inactivation of total coliform by chlorine obeys to Chick-Watson Law with n = 1 and k = 0.075 L/mg.min. The daily flow rate of water to be disinfected is 15000 m³/d. Design a chlorine disinfection tank with specifying dimensions based on a suitable contact time and determine initial and residual chlorine concentrations for 99.9% of disinfection efficiency. Finally, calculate daily amount of calcium hypochlorite required as kg/d for this disinfection process. Note that residual chlorine concentration should be greater than 0.75 mg/L. 2,5 Chlorine dose (mg/L) 2 15 0,5 0 0 10 20 30 40 Time (min) 50 60 70
a pond is used to treat a dilute municipal wastewater before the liquid is discharged into a river. the inflow to the pond has a flow rate of 4000 m3/day and a bod concentration of 49mg/l. the volume of the pond is 20000m3. the purpose of the pond is to allow time for the decay of bod to occur before discharge into the environment,in this case a river bod decays in the pond with a first order rate constant equal to 0.25 day. a drinking water tretment abstraction point is located 100m downstream of the pond effluent discharge point for the pond. determine the bod concentration at the outflow of the pond in units of mg/l conclude if the effluent from the pond satisfy with the requirement of the DOE malaysia according to the suitable effluent discharge standard Search Results
2. Families in a community in a developing country use large, 200.0 L drums to un-treated surface water. You are designing a device that is designed to dose the volume with a coagulant, stir to allow flocculation, then add chlorine tablets to disinfect the water. The water is 25 °C and initially contains 1.0E+09 particles per L. The initial particles can be assumed to be spherical, 15.0 micrometers in diameter, and with a density of 1.675 g/mL. a. If the drums have a diameter of 572 mm, how long will it take for the particles to completely settle without any coagulation or flocculation? (answer in seconds) You have determined that you can achieve complete destabilization of particles by achieving an ionic strength of 0.01 M or higher. If you use alum (Al2(SO4)3) as a coagulating agent, what mass of alum must be added per batch of 200 L? (answer in grams) How many joules of energy would be required to stir the drum at a mixing intensity of 150 s-' for 20 minutes? If the drum is stirred…
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Write the importance of BOD/COD ratio. If 5 days 25 °C BOD of sewage sample is 180 mg/L, calculate its 5 days 20 °C BOD. Assume the deoxygenation constant at 20 °C, K 20 as 0.23 d-¹ at base e. Deoxygenation constant varies with with temperature as KT = K20 (1.05)T-20, where T is temperature in °C.
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