QUESTION FIVECalculate the efficient substrate concentration, the thickening ratio and the purge rate given thefollowing data from an activated sludge waste water treatment plant.Influent flow rate:HMixed Influent BOD concentrationQi=1000m³/hrSo = 356mg/1Sludge concentration (Basin) X = (MLVSS) 4mg/lEffluent sludge contentInfluent sludge contentRaw Influent BOD concentrationSubstrate removal rate by r, is given by the equationNet growth rate of the micro-organisms rx is given bywhere:Xe=0mg/1Xi = 0mg/1S₁ = 450 mg/LdS1 μmaxSr'sXdtYKS +SdXμmax SXrx =-dtKs + S- KaXμmax= 0.45 day¹,KSKDY= 50mg/1 BOD,== 0.05 day-¹= 0.5 kg VSS/kg BOD

Since Xi=0, we assume the effective thickening ratio is not applicable as the system does not…

Answered: QUESTION FIVE Calculate the efficient…

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 centrifuge dewaters digested sludge from ananaerobic digester. Pertinent performance data are; raw sludge feed rate to the anaerobicdigester = 60,000 lb/day on a dry solids basis, digester suspended solids removalefficiency = 55 percent, suspended solids concentration in digested sludge fed to thecentrifuge = 5.0 percent by weight, centrifuge cake solids concentration = 30 percent byweight, centrifuge solids capture = 90 percent. Sketch a process flow schematic of the system showing both the digester andcentrifuge and all flowing fluid streams, clearly identify the appropriate control surface(s)for mass balance analyses, and then determine;(i) dewatered sludge mass flow rate (lb/day)(ii) centrate flow rate (gal/day)(iii) centrate suspended solids concentration (mg/l).
A continuous stirred tank reactor (CSTR) Activated Sludge Process is used to treat municipal wastewater after primary sedimentation. The following data is available: Primary Effluent Flow Rate (Q) Primary Effluent BOD Concentration (So) Secondary Effluent Biomass Concentration (Xe) Mixed Liquor Biomass Concentration (X) Solids Retention Time (SRT) Waste Sludge Flow Rate (Qw) Value 450 200 O 0 3,000 5 8 Biomass Concentration in RAS (XR) 8,000 O 250 million gallons, 0.28 gBOD/gVSS.d, 13.3 hours 107 million gallons, 0.28 gBOD/gVSS.d, 5.7 hours O 107 million gallons, 0.42 gBOD/gVSS.d, 5.7 hours 107 million gallons, 0.28 gBOD/gVSS.d, 12.2 hour Unit mgd mg/l mg/1 mg/l days mgd The bioreactor volume (V), F/M ratio, and HRT are respectively: mg/l
Enter T next to the following true statements and F next to the false statements. Settling of suspended solids in secondary clarifiers is typical of Type II sedimentation. Thickening prior to digestion is common in many wastewater treatment plants because it reduces the size needed for the digester. Based on a temperature of 30°C, a design mean cell residenee time of about 20 days would be reasonable for a completely-mixed anaerobic digester without recycle. A volatile suspended solid is defined as an organic solid that can be oxidized to CO2 (g) at 250°C. The theoretical yield coefficient can be estimated from the observed yield coefficient if the specific growth rate constant is known. Air flotation would likely be more efficient for thickening waste activated sludge than primary sludge, while the opposite would be true for gravity thickening. The net mass of cells produced in the activated sludge process equals the total cell mass synthesized minus the cell mass wasted as waste…
The following data on the substrate removal rate and the substrate concentration is available for wastewater treatment (S) mol Rate, r (mol/min) 0.04 0.57 0.06 1.05 0.8 2.32 0.10 3.00 0.12 4.68 0.14 5.42 2.0 5.78 Estimate the value of substrate removal constant Km and the value of Vmax
In a BOD test, 5 ml of wastewater (with no dissolved oxygen) is diluted with 295 ml of water containing 8.5 mg/1 of dissolved oxygen. After 5 days incubation at 25°C, the dissolved oxygen content of the mixture is 5 mg/1. Temperature coefficient can be taken as 1.047 and BOD rate constant is 0.23 per day (base e) at 20°C. The ultimate biochemical oxygen demand of the wastewater is
1. The following information is provided for an activated sludge system design: Parameter Symbol Value Units Flow rate Q 10000 m³/d Influent BOD So 150 mg/L Effluent BOD S 2 mg/L Hydraulic residence time Ꮎ 4 hr Mean cell residence time Oc 6 d Maximum specific growth rate μm 3 1/d Half saturation constant Ks 40 mg/L Yield coefficient Y 0.5 Endogenous decay coefficient b 0.08 1/d Death rate coefficient γ 0.04 1/d Determine: a) The aeration tank biomass concentration (X) in mg/L b) The aeration tank oxygen requirement in kg/d c) The rate of biomass wasting in kg/d

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