The treated domestic sewage of a town is to be discharged in the natural stream in whic minimum flow is equal to 0.14 m³/s. The BOD in the stream on the upstream side is 3 mg/L. Th treatment plant receives the waste water from a town with a population of 60000 persons with dry weather flow of ( 153 liters/capita/day. Assume per capita BOD contribution as 0.0 kg/day. a) Determine the percentage of the purification required in the treatment plant if the permissib BOD on the downstream side of the stream is 5 mg/L. b) Draw a labeled diagram to show the process of self-purification of the natural stream if it th treated offluent

The treated domestic sewage of a town is to be discharged in the natural stream in whic minimum flow is equal to 0.14 m³/s. The BOD in the stream on the upstream side is 3 mg/L. Th treatment plant receives the waste water from a town with a population of 60000 persons with dry weather flow of ( 153 liters/capita/day. Assume per capita BOD contribution as 0.0 kg/day. a) Determine the percentage of the purification required in the treatment plant if the permissib BOD on the downstream side of the stream is 5 mg/L. b) Draw a labeled diagram to show the process of self-purification of the natural stream if it th treated offluent

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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Problem 2.Assume that DLSUD lake is 100m? and its average height is 5ft. Wastewater that flows into the lake are the following: Food square kitchen waste 5m³/hr; Total Dissolved Solids (TDS) is 50g/L which operates 8hrs per day b. CIH 5m³/hr kitchen waste; TDS is 20mg/L which operates 4hrs per day c. PCH 20m³/day diluted laboratory waste ; TDS = 40mg/L а. (1)Determine the volume of wastewater which DLSUD lake can still be contained without rainfall. (2)During operational hours a heavy rain fall, the rain gauge reading is 1.5m. Will the DLSUD Lake overflow? What is the volume of water that will over flow? (3). Compute the TDS concentration of the overflow.
The treated domestic sewage of a town is to be discharged in a natural stream with following data given: (i) Population = 50,000 (ii) BOD contribution per capita = 0.07 kg/day (iii) BOD of stream on u/s side = 3 mg/It. (iv) Permissible maximum BOD of stream on d/s side = 51 (v) Dry weather flow of sewage = 140 litres per capita per day 5 mg/lt. (vi) Minimum flow of stream = 0.13 m3/sec Choose the correct statement(s): BOD of treated sewage should be 8.21 gm/lt. Total BOD produced per day is 35000 kg/day C BOD of untreated sewage is 500 mg/It. Correct Option D Percentage treatment required is 98.358% Correct Option
Assume that DLSUD lake is 100m2 and its average height is 5ft. Wastewater that flows into the lake are the following: Food square kitchen waste 7 m3/sec; Total Dissolved Solids (TDS) is 25,000 mg/L which operates 8hrs per day CIH 5m3 /hr kitchen waste; TDS is 20mg/L which operates 4hrs per day PCH 20m3 /day diluted laboratory waste ; TDS = 40mg/L (1)Determine the volumetric flow rate of the lake water can still accommodate prior to rainfall.
Problem 2.Assume that DLSUD lake is 100m² and its average height is 5ft. Wastewater that flows into the lake are the following: a. Food square kitchen waste 5m³/hr; Total Dissolved Solids (TDS) is 50g/L_which operates 8hrs per day b. CIH 5m³/hr kitchen waste; TDS is 20mg/L which operates 4hrs per day c. PCH 20m/day diluted laboratory waste ; TDS = 40mg/L (1)Determine the volume of wastewater which DLSUD lake can still be contained without rainfall. (2)During operational hours a heavy rain fall, the rain gauge reading is 1.5m. Will the DLSUD Lake overflow? What is the volume of water that will over flow? (3). Compute the TDS concentration of the overflow.
i). A town produces 8 million litre of sewage per day. BOD of sewage is 260 mg/L, it is to be discharged into a river flowing at a rate of 0.2 m³/s and it's BOD is 5 mg/L. Find out the BOD of river after mixing? [Assume mixing is instantaneous]
1. It is estimated that the BOD of raw sewage received at a treatment plant serving a population of 20,000 will be 300 mg/L. It is es1mated that the per capita BOD loading is 0.17 lbm/day. 30% of influent BOD is removed by settling. One single-stage high-rate trickling filter is to be used to reduce the plant effluent to 50 mg/L. Recirculation is from the filter effluent to the primary settling influent. Ten States' Standards is in effect, which specifies 100 gpcd in the absence of other information. (1) What is the design flow rate? In MGD (2) Assuming a design flow rate of 1.35 MGD, what is the total organic load on the filter? In Ibm/day (3) Assuming an incoming volume of 1.35 MGD and an organic loading of 60 lbm/1000^3 d, what flow should be recirculated? In MGD (4) What is the overall plant efficiency? In precent %
The shrimp processing plant generates 0.012 m3/s of wastewater each day. The wastewater is treated in an activated sludge plant. The average BOD5 of the raw wastewater before primary settling is 1400 mg/L. The aeration tank has effective liquid dimensions of 8.0 m wide by 8.0 m long by 5.0 m deep. The plant operating parameters are as follows: Soluble BOD5 after primary settling = 966 mg/L MLVSS = 2000 mg/L MLSS = 1.25 (MLVS) Settled sludge volume after 30 min = 225 mL/L Aeration tank liquid temperature = 15°C Determine the following: Return Activated Sludge (RAS) flow rate and Wasting Activated Sludge (WAS) flow rate.
1. It is estimated that the BOD of raw sewage received at a treatment plant serving a population of 20,000 will be 300 mg/L. It is es1mated that the per capita BOD loading is 0.17 lbm/day. 30% of influent BOD is removed by settling. One single-stage high-rate trickling filter is to be used to reduce the plant effluent to 50 mg/L. Recirculation is from the filter effluent to the primary settling influent. Ten States' Standards is in effect, which specifies 100 gpcd in the absence of other information. Styles (1) What is the design flow rate? In MGD (A) 0.9 MGD (B) 1.1 MGD (C) 1.4 MGD (D) 2.0 MGD (2) Assuming a design flow rate of 1.35 MGD, what is the total organic load on the filter? In Ibm/day (A) 1700 lbm/day (B) 2100 lbm/day (C) 2400 lbm/day (D) 3400 lbm/day (3) Assuming an incoming volume of 1.35 MGD and an organic loading of 60 lbm/1000^3.d, what flow should be recirculated? In MGD (A) 0.6 MGD (B) 1.1 MGD (C) 1.2 MGD (D) 2.2 MGD (4) What is the overall plant efficiency? In…
A municipal wastewater treatment plant processes an average of 14,000 m3 / day. The peak flow is 1.75 times the average. The wastewater contains 190mg/L BOD and 210 mg/L suspended solids at an average flow and 225 mg/L BOD and 365 mg/L suspended solids at peak flow. Determine the following for a primary clarifier with a 20-m diameter. Assume eff. BOD of 20 mg/L and effluent TSS of 30mg/L for average and peak flows. 1. Surface overflow rate and the approximate removal efficiency for BOD 5 and suspended solids @ average flow. 2. Surface overflow rate and the approximate removal efficiency for BOD 5 and suspended solids @ peak flow. 3. Mass of solids (kg/day) that is removed as sludge from average and peak flow conditions.
(a) Design an oxidation pond for treating sewage from a hot climatic residential colony with 4000 persons, contributing sewage @ 180 lped. The 5-day BOD of sewage is 350 mg/L. Assume organic loading = 300 kg/ha/day Length to breadth ratio = 2:1 Effective depth = 1.2 m Average velocity of sewage in pipe = 1 m/s Daily flow of sewage to oxidation pond for 8 hours only Diameter of outlet pipe = 1.5 times that of the inlet pipe P
a. The wastewater from a manufacturing treatment plant is discharged to a municipal `treatment plant for processing with domestic wastewater. The characteristics of the wastewater from the manufacturing treatment plant are 3500 mg/l BOD, 4500 mg/l SS, 70 mg/l nitrogen and 2 mg/l phosphorous. The characteristics of the domestic wastewater are 350 mg/l BOD, 285 mg/l SS, 50 mg/l N and 11 mg/l P. If the required BOD/N/P weight ratio is 100/5/1, what is the minimum quantity of domestic wastewater required per 1000 gallons of manufacturing wastewater to provide adequate nutrients for biological treatment and the concentration of SS in the combined wastewater? b. What additional of NH4OH and H3PO4 would be required in pounds per million gallons of wastewater to provide the necessary nutrient levels for the treatment of the manufacturing wastewater described above (a) if the domestic wastewater had not been combined with it.
12 1. It is estimated that the BOD of raw sewage received at a treatment plant serving a population of 20,000 will be 300 mg/L. It is es1mated that the per capita BOD loading is 0.17 lbm/day. 30% of influent BOD is removed by settling. One single-stage high-rate trickling filter is to be used to reduce the plant effluent to 50 mg/L. Recirculation is from the filter effluent to the primary settling influent. Ten States' Standards is in effect, which specifies 100 gpcd in the absence of other information. (1) What is the design flow rate? In MGD (2) Assuming a design flow rate of 1.35 MGD, what is the total organic load on the filter? In Ibm/day (3) Assuming an incoming volume of 1.35 MGD and an organic loading of 60 lbm/1000^3 d, what flow should be recirculated? In MGD (4) What is the overall plant efficiency? In precent % St