Secondary Clarifier  An activated sludge plant has a design flow (average daily flow) of 11 MGD. Return sludge ratio R = 0.35.  Determine the dimensions of final settling tanks.  Check weir overflow rate.  The design parameters: number of tank = 4.       Use circular tanks.   MLSS = 3000 mg/L   VSS/TSS = 0.80    overflow rate = 1000 gpd/ft2, detention time = 2  hr weir overflow rate = 10,000 – 15,000 gpd/ft        solid loading rate (lb/d/ft2) = 50 lb/d/ft2

Q: A circular secondary clarifier will be used to treat an average daily flow (ADF) of 6,000 m3 /d from…

A: Overflow Rate (OR) = 15 m3/ d. m2  Solids Loading Rate (SLR) = 100 kg/ d. m 2 Average Daily Flow…

Q: settling basin is designed based on a surface overflow rate that can achieve a removal efficiency of…

A: d1=0.05mm d2=0.1mm

Q: te is 2500 m3/day with a soluble BOD5 of 250 mg/L. The average wastewater temperature is 16 oC.…

A: Bio - Towers : bio towers are only vertical streaming channels having more noteworthy channel media…

Q: For a spiral membrane filtration system, the membrane was fabricated by adding additional shims to…

A: step 1-

Q: Circular clarifiers are used to remove solid materials from water. They allow continuous treatment…

A:

Q: A water treatment plant has a capacity of 110,000 m³/day with two horizontal flow settling basins,…

A: Given Discharge 110000 m3/dayLong 24.5 mWidth 18 mDeep 3.7 mAngle 60°To find out Surface loading…

Q: Determine the time of concentration for use in the NRCS method for a drainage basin located in…

A: The given data is shown below:  Average Grass L = 100’ S = 1.6% n = 0.24Shallow Concentrated L…

Q: oluble BOD5 = 80 mg/L Assume that the BOD5 of the suspended solids may be estimated as equal to 50%…

A: According to given data  A small town has been directed to upgrade its primary wastewater treatment…

Q: 2. The average wastewater flow from a community of 20,000 is 125 gpcd. The 5 day, 20 deg C BOD is…

A: Population = 20000To Find:1) Settling tank surface area2) Settling tank diameter3) BOD removal in…

Q: The 550-bed Atlanta Hospital has a small, activated sludge plant to treat wastewater from the…

A: Given, V = 10 m x 10 m x 5 m N = 550  q = 1.50 m3 per day per bed   To find : Aeration time

Q: The design flow for a water treatment plant (WTP) is 7.2 x 103 m³/d. The rapid mixing tank will have…

A: Given Data:The design flow for the WTP is Q=7.2x103 m3/day.The average alum dosage is da=50 mg/L.The…

Q: Given: Flow rate of water = 500 L/min Suspended solids concentration in influent water = 100 mg/L…

A: As per guidelines, only first question is been solved.

Q: A detention pond is designed to achieve 100% removal of 0.1 mm fine sand particles at the design…

A: Since a detention pond is designed to achieve 100% removal of 0.1 mm fine sand particles at the…

Q: 21.The waste water treatment plant has dissolved oxygen concentration of 2.8 mg/l and a discharge…

A:

Q: usec Eme as a coagulant aid at a water treatment plant. The specific gravity of the floc and adhered…

A: Solution: Given Data: Specefic gravity of the floc and adhered suspended material=1.005 (a) Compute…

Q: Design a wastewater treatment primary clarifier for an average flow rate of 1.10 MGD, and a peak…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Design a primary settling basin (mechanical cleaning) with 2.1 m water depth for a water flow of…

A:

Q: tank is initially filled to capacity with 300 L pure water. At t=0, brine containing 2 g/L salt is…

A:

Q: A conventional activated-sludge system treats 11,000 m3/day of wastewaterin an aeration tank with a…

A: SRT = 7 DAYSExplanation:Step 1:In the context of wastewater treatment specifically with activated…

Q: Rapid Sand Filter - Example

A: Given: Total Flow= 20 mgd = 20 * 10 6 gallons per day Hydraulic Loading= 5gpm/ft2 =5*24*60 gallon…

Q: 03: a- Two sedimentation tanks operate in parallel. The combined flow to the twe tanks is 0.1m'/s.…

A:

Q: Alum at a rate of 20 mg/l is added to an incoming discharge of 0.5 m3/s which carries 250 mg/1 of…

A: 1. Alum added at a rate of 20 mg/l.2. Incoming discharge: 0.5 m³/s3. Incoming discharge carries 250…

Q: The Lo value just downstream from a sewage outfall is 60 mg/L. The DO saturation level at that point…

A: a) Calculation of critical distance:…

Q: A WWTP with activated sludge secondary treatment receives 0.290 m / s of flow from the primary…

A: Answer  We are given flow rate Qo = 0.290 m3/s  microbes concentration the aeration basin X = 2500…

Q: Assuming suitable design criteria, design a primary settling tank to treat 10000 m³/d average…

A:

Q: Problem 2. Using a surface overflow rate of 26.00 m/d and a detention time of 2.00 hours, size of a…

A:

Q: A manufacturing facility that manufactures printed circuit boards puts wash water that was used to…

A:

Q: 2. The sedimentation portion of the in-line treatment plant is to be designed. The proposed design…

A: Given  Width of sedimentation tank = 130 ft  Length of sedimentation tank= 180 ft  Depth of…

Q: Sedimentation is the process of allowing particles in suspension in water to settle out of the…

A: Given: Discharge for four clarifiersQ=1.5 MGD Q=1.5×3785.4 m3day       1 MGD=3785.4 m3day Q=5678.10…

Q: The inital rate of infiltration of a watershed is estimated as 2.1 in/hr, the final capacity is 0.2…

A: Initial infiltration rate (fo) = 2.1 in./hr Final infiltration rate (fc) = 0.2 in./hr Time constant…

Q: A complete mixed activated sludge process (CMAS) is to be designed to treat 5MGD of primary effluent…

A: To determine the minimum MCRT, we can use the following equation: MCRTmin = 1 / kd MCRTmin = 1 /…

Q: During normal operation, both chambers would be used. Each chamber is to be a rectangular tank with…

A:

Q: a) An activated sludge plant with recycle is evaluating its secondary clarification system. Settling…

A: Activated sludge process:  The process of removeal of suspended growth process for the solid waste…

Q: 10. A 15,000 ft" conventional activated sludge system has a recycle ratio of 0.38, an influent flow…

A:

Q: Q2: A column analysis for an activated sludge su MLSS Conc (mg/l) Settling velocity m/h 1000 2.8…

A:

Q: After initial mixing of a wastewater discharge in a 5-m-deep river, the DO concentration in the…

A: Please refer the attached image for complete solution. THANK YOU !

Q: The minimum temperature of the water is 5 °C, the free chlorine residual in the effluent from the…

A:

Q: The 550-bed Atlanta Hospital has a small, activated sludge plant to treat wastewater from the…

A: Given, BOD5 after primary settling, So = 450 mg/L MLVSS = 2,600 mg/L   To find : F/M ratio

Q: AA רואד רחר בורו Determine the size (diameter and depth) of the secondary clarifier (s) at a…

A: Step 1

Q: 12.50 Determine the activated-sludge aeration volume required to treat 2.64 mgd with a BOD of 120…

A: The objective of the question is to determine the aeration volume, MLSS, sludge age, and the…

Q: 2. The average wastewater flow from a community of 20,000 is 125 gpcd. The 5 day, 20 deg C BOD is…

A: Population = 20000To Find:1) Settling tank surface area2) Settling tank diameter3) BOD removal in…

Q: QI:- Design a settling tank for a flow of 0.2 MGD if the overflow rate is not to exceed 600 gpd/n.…

A: Given information  Discharge  Surface overflow rate Depth Length by width ratio Depth.

Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.