Q4: A wastewater treatment plant as shown:The surface area of each unit 800 m². Depth of each unit 2 m. and %BOD removal inPrimary and Secondary sedimentation tanks = 25%. Find:1- Total % BOD removal in the plant.2- BOD removal in the Trickling filter.3- The flow rate (m³/d) in the plant.r-150%BOD, 180 mg/lPri. sed. tankRiverBOD,-20 mg/1Trickling filterSec. sed. tank(25 marks)

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Answered: Q4: A wastewater treatment plant as…

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 wastewater containing 300 mg/l SS and 250 mg/l BOD passes through a primary sedimentation tank of surface area 600 m². The flow is 15*103 m³/d. Estimate the effluent SS and BOD. (Use Figure 1)
Q3: A raw wastewater containing 300 mg/l SS and 350 mg/l BOD passes through a primary sedimentation tank with a surface area of 600 m². Average flow rate is 15000 m³/d and a peak factor of 1.5. Estimate the effluent BOD and SS at average and maximum flow, and the average and maximum rate of sludge production? D
The results of a water analysis for Sungai Buaya is shown below: = 2.5 meq/L Mg²* = 0.6 meq/L Na* 1.7 meq/L SO? = 2.0 meq/L 0.2 meq/L Ca²+ HCO; %3D 2+7 = 0.4 meq/L = 0.4 meq/L Cl K+ (i) Calculate the concentration for each cation and anion component in mg/L (ii) Draw a miliequivalent per litre bar graph (iii) List the hypothetical combinations with values (iv) Calculate the non-carbonate hardness in mg/L as CaCO3
h₂ h2-h1 h₂ Q b=h Unconfined aquifer Ⓒ Steady flow h1 = 80ft h2 = 100ft r1 - 800 ft r2 = 1000 [L Pumping rate = 300 gpm Estimate hydraulic conductivity of the aquifer 1 gpm = 192.5 ft3/day
1.3, tank width -8 m, the moisture content of the sludge is 95% and the concentration of suspended A rectangular sedimentation tank removes 80% of 0.06 mm diameter particles with SG= solids in the effluent flow is 200 mg/L, detention time 2 hrs for discharge 15000 m³/day. Determine the following: a) Dimension of the tank. Surface over flow rate b) Maximum horizontal velocities keep particles in settling d) The depth of sludge in the basin if its cleaning is daily
The initial rate of infiltration of a watershed is estimated as 53 mm/hr, the final capacity is 5 mm/hr, andthe hydraulic conductivity, k as 0.4hr-1. Use Horton’s equation to find: • The infiltration capacity at t = 3 hr and 6 hr• The total volume of water infiltrated over the 6-hr period.
A rectangular sedimentation tank following coagulation- Exa flocculation is to treat a flow of 3000 m³ / day with a detention time of 6 hours. It is to be hand cleaned of sludge at 6 week intervals. The suspended solids concentration of the water is reduced from 250 mg/L to 5 mg|L by coagulation- flocculation. The settled sludge includes 40 mg/L (based on water flow) of metallic precipitate and has a moisture content of 85% and specific gravity of 1.24. Determine the volume of sludge produced between cleanings and the basic dimensions of the tank if the water depth just before cleaning is 3 m and its length is twice its width.
9-2. A flow of 20,000 maay which contains 100 mg/L of suspended solids is coagulated with 50 mg/L of alum. If 90 percent of the solids and chemical precipitates is removed in sedimentation estimate: (a) Total dry mass of sludge produced per day. (b) Total wet mass produced per day, assuming the sludge is 5 percent solids by weight. (c) Total volume produced per day, assuming the specific gravity of the wet sludge is 1.05.
Design a sedimentation basin for a water treatment plant with the following specifications assuming it is required to supply a city with a population of 50,000 people: Rectangular or square basin • Depth: 7-18 ft ● . • Width: 10-50 ft Detention time: 4-8 hours Flow through velocity: <0.55 ft/min Overflow rate: 400-1,100 gal/day-ft² Draw a figure to show calculated dimensions. You may consider to use SI units in calculations. ● ● Hint: Overflow rate is Flow/Surface Area; Detention time is Volume of tank/Flow rate; and Depth= Volume/Surface area
A rectangular settling basin has a depth of 3 m, a length of 40 m and a width of 6 m. The water treated in the basin has a flow rate of 500 L/s and contains 50 mg/L of type a particles, 100 mg/L of type b particles and 180 mg/L of type c particles (particle type letters refer to the particles listed in problem 1). What is the suspended solids concentration in the effluent from the settling basin? Determine the overall percent removal of suspended solids from the water achieved by the settling basin.

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