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 coagulation treatment plant with a flow of 0.5 m/s is dosing alum at 23 mg/litre. No other chemicals are being added. The raw water suspended solid concentration is 37 mg/l. The effluent suspended solid concentration is 12 mg/l. Sludge content is 1% and specific gravity of sludge is 3.01. What volume of sludge must be disposed of every day.
A wastewater treatment plant uses an activated sludge process to treat 0.2 m3/s of primary effluent. The concentration of the mixed liquor is 2,000 mg/L MLVSS (Mixed liquor volatile suspended solids), while the RAS (recycled activated sludge) concentration is 10,000 mg/L MLVSS. The substrate concentration in the primary effluent is 210 mg/L BOD5. The F/M ratio is 0.5 mg BOD5/(mg MLVSS-d) and the solids retention time is 8.5 d. What is the volume of the activated sludge tank? 2.What is the WAS (waste activated sludge) flowrate? 3.What is the flowrate of the secondary treated effluent? 4.What is the RAS (recycled activated sludge) flowrate? 5.What is the hydraulic residence time for the activated sludge tank?
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Q2: A coagulation treatment plant with a flow of 0.5 m/sec is dosing alum at 23 mg/l. No other chemical is being added. The raw water suspended solids concentration is 37 mg/l. The effluent suspended solids concentration is measured as 12 mg/l. The sludge content is 1% and the specific gravity of sludge solids is 3.01. What volume of sludge must be disposed of each day? Based on your result, remark with tolerance to water treatment process.
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