A wastewater treatment plant treats 750 m³/hr. of SS concentration=300mg/l and BOD 180 mg/l. The treatment plant consists of one primary circular sedimentation tank and two single stage trickling filters. The primary sedimentation tank of surface area-500 m² and detention time 1.6 hr. Each trickling filter of depth= 2m, r-125% and BOD removal- 75 %. Find: 1.Depth (m) and weir loading of the primary sedimentation tank (m³/m/d). 2.Diameter of each trickling filters (m). 3.Total BOD removal in treatment plant (%).

A wastewater treatment plant treats 750 m³/hr. of SS concentration=300mg/l and BOD 180 mg/l. The treatment plant consists of one primary circular sedimentation tank and two single stage trickling filters. The primary sedimentation tank of surface area-500 m² and detention time 1.6 hr. Each trickling filter of depth= 2m, r-125% and BOD removal- 75 %. Find: 1.Depth (m) and weir loading of the primary sedimentation tank (m³/m/d). 2.Diameter of each trickling filters (m). 3.Total BOD removal in treatment plant (%).

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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8 Determine the solid loading rate on a secondary circular clarifier (diameter = 20 m) if the plant influent load is 2 ML/d. The recycle flow from secondary clarifier to the activated sludge system (aeration basin) is set to 10% of the influent load. It is also known that the aeration basin produces an MLSS (mixed liquor suspended solids) concentration of 3000 mg/L.
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A conventional Wastewater Treatment Plant receives an average daily wastewater flow of 38,000 m2/d. Two circular primary clarifiers, operating in parallel, will treat the flow. Assume that a peripheral effluent weir is used for each clarifier. Consider a detention time of 2 hours and water depth of 4 meters for each clarifier. Determine: a. The diameter (m) of each primary clarifier. b. The weir loading rate (m3/d . m) for each clarifier at average daily flow. c. The expected (not calculated) BODs and Suspended Solids removal efficiencies (%) at an average daily flow rate.
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