Answer fast Problem 3. Rework Problem 1 above (using an MLVSS concentration of 3,000 mg/L),but for a PFR with a recycle ratio = 0.50.Also use the same Q==12,960 m³/d, So=84 mg BOD5/L, same S corresponding to theeffluent standard of 30 mg BOD5/L and 30 mg/L suspended solids (with BOD5 of effluentsolids = 63% of suspended solids concentration), Ks = 100 mg BOD5/L, ka = 0.05 d¨¹, μm=2.5 d¹, Y 0.5 mg VSS/mg BOD5.=µm=

Answered: Image /qna-images/answer/c5628fe8-115c-4bc3-b6a4-1158c1333ed9.jpg

Answered: Problem 3. Rework Problem 1 above…

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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Q1:) A circular coagulation basin has a diameter of 2.5 m and it's depth equal to 1.60 m. If the following data are available: Gt=27000, t-30 s, μ-1.003× 10³ kg/m.s,alum dosage=50 mg/l, determine: a) The required mixing power in unit of (kW). b) The daily quantity of alum added in unit of (kg/d). Q2:) The flow described in (Q1) above is to be flocculated in a basin having four flocculators with transverse paddle units. The basin may be a maximum of 6 m wide and 4 m deep to connect to the settling basin. Determine: (1) Basin dimensions: (2) power requirements. μ= 1.002× 10³ kg/m.s The best Gt value for the system has been found to be 5 x 104, and the G value is 40 s¹.
0.02 mm silt particles are completely destabilized by adding alum and are passes through completely mixed flocculation basin (CSTR). The basin is cube with 3.0 m dimension. The water entering the flocculator with flow rate of 0.09 m3/s. What is the efficiency of this flocculator in removing particles given that (mixing intensity G = 250 1/s; flock volume Q=5*105, and collision efficiency factor a=1) a. 85% b. 93% c. 83% d. 96 % e. 90%
2. (a) Design a gravity thickener to concentrate the mixture of sludge obtained from primary and secondary settling units in an activated sludge wastewater treatment plant. Make appropriate assumptions in your calculations. Sludge waste flow rate in the primary settling unit= 140 m³/d; and concentration = 2.5% Sludge waste flow rate in the secondary settling unit= 350 m/d; and concentration = 0.6% Qi ci Solids Loading Rate (SLR) = 40 kg ds / m².d, and SLR : A ci Qi Tc Expression for thickening zone depth= 0.75Cu A Ci: Incoming mixed sludge concentration Qi: Incoming mixed sludge flow rate A: Cross section area of the thickening tank Cu: Target underflow concentration (=5%) Tc: Time in compression zone (=2 days)
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
Q2: A column analysis for an activated sludge suspension yielded the following: MLSS Conc (mg/l) Settling velocity m/h 1000 2.8 2000 3000 1.2 0.4 4000 0.2 5000 Question 0.1 6000 0.06 The influent MLSS concentration is 2000 mg/l and the flow rate is 4200 m³/d. Determine the size of the clarifier that will thicken the solids to 8000 mg/l.
Given:Flow rate of water = 500 L/minSuspended solids concentration in influent water = 100 mg/LRequired effluent suspended solids concentration = 10 mg/LFiltration rate = 10 m^3/m^2/hrFiltration tank dimensions: Length = 5 m, Width = 3 m, Depth = 4 mCalculate:o Calculate the total suspended solids (TSS) load in the influent water:o Calculate the filtration tank surface area:o Calculate the required filtration tank capacity:o Calculate the required detention time in the filtration tank: Q2) DisinfectionGiven:Flow rate of water = 2000 m^3/hChlorine residual required in effluent = 0.5 mg/LInitial chlorine concentration in influent water = 2 mg/LChlorine decay rate in disinfection tank = 0.05 per hourDisinfection tank volume = 300 m^3Calculate:o Calculate the chlorine demand in the influent water:o Calculate the chlorine dosage required:o Calculate the chlorine dosage rate:o Calculate the actual chlorine dosage rate considering chlorine decay:
Round off answer to two decimal places unless otherwise stated in the problem
(a) A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m3 /s. The design TDS concentration of the product water is below 400 mg/L. The net pressure is 40 atm. The membrane manufacturer provides that the membrane has a water flux rate coefficient of 2.2 x 10-6 s/m and a solute mass transfer rate of 1.5 x 10-6 m/s. Calculate the membrane area required for the RO system. (B) A water treatment at Nibong Tebal receiving a raw water contains a concentration of 0.5 µg/m3 atrazine from Kerian River. In order to comply with the drinking water quality guideline, the treatment plant should reduce the concentration of Atrazine to 0.1 µg/L. If the dosing of powdered activated carbon have been applied before the coagulation, calculate the minimal dose of PAC in mg/m3 .
3. Circular clarifiers are used to remove solid materials from water. They allow continuous treatment of water and can handle fairly large flows. Solids settle to the bottom of the clarifier and are carried away by a small stream of water (the waste stream). Most of the water exits the tank as treated effluent. Assume a clarifier receives a flow of 0.10 m3/s with a solid concentration of 800 mg/L. If the waste stream consists of 3% of the incoming flow and carries 90% of the incoming solids, a) what is the solids concentration in the waste stream, and b) what is the solids concentration in the treated effluent?
Q3 - A WSP system is going to be designed for a new town that receives 10000+(Y×1000) m/d with influent BODs concentration of 100+Y mg/L and working temperature of 25°. Effluent BOD level must be maintained at 25 mg BOD/L. Assume E.Colli concentration is 5X107 per 100 ml, considering these assumptions answer the following questions: Y=4 (i) Select best pond system arrangement. (ii) Design the ponds and determine their volume, surface area and depth, as well as removal efficiency of each pond and effluent BODS concentration.
4
Two wastewater streams A and B, having an identical ultimate BOD are getting mixed to form the stream C. The temperature of the stream A is 20 °C and the temperature of the stream C is 10 °C. It is given that • The 5-day BOD of the stream A measured at 20 °C=50 mg/l • BOD rate constant (base 10) at 20 °C-0.115 per day Temperature coefficient = 1.135 The 5-day BOD (in mg/l, up to one decimal place) of the stream C, calculated at 10 °C, is ●

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