Solve the points in the hand 4.2.AWWTP is to treat 5 MGD of wastewater using activated sludge. Five sets of aeration tank followedb) 76 Ib/d.ft²c) 51 Ib/d.ft²d) 631b/d.ft²by five secondary clarifiers to be used of which four of them to be working at any time. The MLSS is1400 mg/L. What is the solids loading rate if the cross section area is 300 ft² and the flow rate ofactivated sludge need to be returned from the recycling line is 30%?a) 46 Ib/d.ft²4.3.Two machines working in a room measures (40 m x 10 mx 5 m). Every machine emits an airpollutant (MW=106 g/mole) at a rate of 230 mg/hr. Assume the air pollutant is conservative. Howmany air changes per hour are needed to maintain a concentration of 0.1 ppm in a STP of 1 atm. andd) 1.25 change/hrc) 0.76 change/hr25°C?b) 0.53 change/hrtnining_tr metea) 0.25 change/hr

Question-(4.2) : Step 1: Step 2: Step 3: Step 4: Question-(4.3) : Step 1: Step 2: Step 3:

Answered: 4.2.AWWTP is to treat 5 MGD of…

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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QUESTION 26 Calculate Peak Wet Weather Flow given the following information about a wastewater treatment plant: Average Dry Weather Flow 7,700 m3/day Peak Factor 2.74 Infiltration 15 % Peak Dry Weather Flow =PF X ADWF
What aerobic reactor volume and operating SRT (8) are required to treat a 20 MGD domestic wastewater flow from an initial ultimate BOD - 300 mg/L to an effluent BODu 5 mg/L assuming a complete mix activated sludge system? Use the design information below assuming 1st order kinetics. MLVSS = 3,000 mg/L - X Y-05 K=0.1 L/mg'day (1st order degradation rate constant) K₂ -0.1 day 1 Answers are given as Aeration Tank Volume, Operational O 0.1 MG, 2.5 days O 19.65 MG, 20 days O 3.93 MG, 6.7 days 5.2 MG, 5.1 days
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a) A wastewater treatment plant consists of primary treatment followed by an activated-sludge secondary system. The plant processes 7000 m3/d of wastewater with 180 mg/L of BOD5 and 150 mg/L of suspended solids. The primary sludge contains 500 kg of dry solids per day with 4.5% solids content. The plant produces 760 kg of total sludge (primary and secondary) per day. Assume 30% removal efficiency of the primary clarifier and F/M ratio of 0.2 for the aeration tank. Determine the following: a. Primary sludge volume and removal efficiency of primary clarifier b. Influent and effluent BOD5 of the secondary activated-sludge system c. Volume of secondary sludge with 1% solids content. b) In problem a), the primary and secondary sludges are mixed in a gravity thickener and sent for further treatment. The thickened sludge contains 4% solids. Calculate the percent volume reduction in the gravity thickener. c) The thickened sludge from problem b) is to be digested in a standard-rate mesophilic…
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Fully mixed sludge recycle activated sludgeWhat are the operating problems of the system?

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