A house with seven (7) occupants located in a sub urban village used a septic tank to treat all their household wastes. Water supply used for cleansing is 160 L per person per day. The ambient temperature is not less than 25°C for most of the years. If the house practise the desludging every three (3) years and the suggested maximum sludge accumulation rates (S) is 40 L per person per year. (b) (i) Determine the volume of liquid entering the tank each day (ii) Volume of sludge and scum (iii) Total volume of the septic tank

A house with seven (7) occupants located in a sub urban village used a septic tank to treat all their household wastes. Water supply used for cleansing is 160 L per person per day. The ambient temperature is not less than 25°C for most of the years. If the house practise the desludging every three (3) years and the suggested maximum sludge accumulation rates (S) is 40 L per person per year. (b) (i) Determine the volume of liquid entering the tank each day (ii) Volume of sludge and scum (iii) Total volume of the septic tank

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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A small town discharges its sewage effluent in a nearby river. The river has an initial background BOD of 23.5 mg/L.The oxygen deficit just upstream from the point of discharge of the sewerage is 4 mg/L. The river is flowing at aspeed of 43 km/day. You have been asked to determine the impact of this town’s sewerage discharge on the rivergiven that the deoxygenation rate coefficient kd is 0.3/day, and the reaeration rate coefficient kr is 0.5/day.a) A sensitive fish species inhabits the river 120 km from the point of discharge. Determine if the impact of theBOD will have led to the minimum DO before or after the location of the fish species.b) Find the minimum DO due to the effluent discharge.c) Discuss the oxygen deficit in relation to the location of the fish species and whether the fish are at risk due tothe discharge upstream.
Sewerage waste was discharged into Mulungushi River from Iris lodge which is located along the banks of the river as they had a problem with a septic tank since it was full. This problem normally occurs in the rain season and this resulted in a mixture having DO of about 9mg/L. The average occupancy rate monthly is about 70%. The septic tanks are emptied after every two weeks. After 5 days, DO dropped to 3mg/L when ZEMA carried out the analysis of the water sample in the river. The reaction constant rate k was found to be 0.22 day ^(-1) and the oxygen consumed in the first five days was 200mg/L. a) How do suspended solids and chemicals affect the surrounding environment? Give two examples. b) What would be the ultimate carbonaceous BOD? c) What will be the remaining oxygen demand after 5 days? d) What advise can you give to the to the lodge owner as a Civil Engineer?
Following are the Design data for the septic tank : Wastewater flow rate = 150 lcpd desludging period = 5 years sludge accumulation rate = 0.06 m3 per person per year household = 12 persons Design sludge volume.
How many gallons of 12-percent sodium hypochlorite solution are needed to disinfect a reservoir 20 feet in diameter and 6 feet deep? An initial chlorine dose of 80 milligrams per liter (mg/L) is expected to maintain a chlorine residual of over 50 mg during the 24-hour disinfection period.
Q...Calculate the number and size of slow Sand Filter units to serve a population of 15,000 persons with an average water consumption of 200 lpcd. Adopt a filtration rate of 0.20 m3/m2-hr when the population increases by a geometric rate of population growth of 0.042/year and the design period of 15 years. What will be? (Part-a): the rate of filtration if one unit is out of operation, and (Part-b): the rate of filtration if two units are out of operation. Check both the results and compare with the”range rate of filtration of Slow Sand filters”.
Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Determine the 95% confidence interval for the true mean DO concentration.
Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Local environmental regulations prescribe a minimum DO concentration of 2.0 mg/L. Perform a hypothesis test to determine whether the river’s water quality satisfies local regulations at a 5% significance level. (follow the 8step hypothesis test)
Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 a. Local environmental regulations prescribe a minimum DO concentration of 2.0 mg/L. Perform a hypothesis test to determine whether the river’s water quality satisfies local regulations at a 5% significance level. (follow the 8step hypothesis test)b. Assume that the daily DO concentration is normally distributed. Estimate the values of the parameters μ and σ.c. Determine the 95% confidence interval for the true mean DO concentration.
Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Assume that the daily DO concentration is normally distributed. Estimate the values of the parameters μ and σ.
A lagoon with a volume of 1200 m3 has been receiving a steady flow Q = 100 m3/day of a non-conservative pollutant with a reaction rate constant k1 = 0.2 day-1 for a long enough time to assume that steady state conditions apply (there is an effluent stream flowing out that needs to satisfy steady state conditions). The waste entering the lagoon has a concentration of 10 mg/L.Assuming complete mixing conditions, what would the concentration of the pollutant be in the effluent leaving the lagoon?
The rate of eradicating microbes through chlorination process is 0.22/min when the wastewater is flowing at a rate of 36 m3/h. If the depth of chlorination tank is 1.6 m and the width is 1.2 m, determine the required length of the tank to achieve 98% removal.
A University was opened on 21st March 2021. Due to the high number of students who reported at the main campus, there was waste water dischare into the universities River with dissolved oxygenconcentration of 2.0 mg/l at a discharge rate of 1.10m3/s from the stabilization ponds. After two days, there was another discharge downstream with dissolved concentration of 2.1 mg/l at a discharge rate of 1.20m3/s. After 1 hour a different discharge of waste with dissolved oxygen concentration of 0.5 mg/l at a discharge rate of 1.10m3/s was discharged in the River immediately after the second discharge point. The River that was receiving the waste had initial DO equal to 8.3mg/l, a constant flow of 8.70m3/s, and the temperature of 20' C. The saturated value of dissolved oxygen DOs at 20 ‘C is normally 9.09 mg/l. Just below the point where a continuous first discharge of pollution mixes with a river, the BOD was 10.9 mg/l. Using a deoxygenation constant of 0.20/day, an average flow of the mixture…