Which of the following is/are correct about BOD inmunicipal sewage?1.It must be removed because it is alwayspathogenic and thus poses a risk to public health2.It is utilized by the microorganisms which thusreduces adverse environmental effectsIt is typically wholly particulate and can beremoved by settling3.It is partly solid and can only be partiallyremoved by settling4.5.It is a carbon and energy source formicroorganisms in the sludgeO 3,4 and 5O 1,2 and 3O 1,3 and 5O 2, 4 and 5 The preliminary stage in a wastewater treatmentplant1.Removes only large items that cannot be takenup in the biological process2.Removes the large items to protect the plantequipmentIncludes flow measurement devices to help inthe control and operation of the biological stage3.4.Normally produces significant BOD removalthat aids in meeting regulatory restrictions2 and 3O 11, 2, 34

Which of the following is/are correct about BOD in municipal sewage? 1. It must be removed because it is always pathogenic and thus poses a risk to public health 2. It is utilized by the microorganisms which thus reduces adverse environmental effects 3. It is typically wholly particulate and can be removed by settling

Which of the following is/are correct about BOD in municipal sewage? 1. It must be removed because it is always pathogenic and thus poses a risk to public health 2. It is utilized by the microorganisms which thus reduces adverse environmental effects 3. It is typically wholly particulate and can be removed by settling

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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Subject: Environmental science Give me right solution A stream receiving sewage effluent has an initial DO deficit of 1.5 mg/L at the discharge point of this sewage. DO deficit at the downstream critical point is 4.5 mg/L. The stream has a saturated DO of 8.0 mg/L under the ambient temperature condition. The lowest DO downstream of this effluent is _____ mg/
Which of the following is/are correct about BOD in municipal sewage? 1. It must be removed because it is always pathogenic and thus poses a risk to public health 2. It is utilized by the microorganisms which thus reduces adverse environmental effects 3. It is typically wholly particulate and can be removed by settling 4. It is partly solid and can only be partially removed by settling 5. It is a carbon and energy source for microorganisms in the sludge O 2, 4 and 5 O 1, 3 and 5 O 3, 4 and 5 O 1, 2 and 3 Clear mu choico
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The City of Marietta has been directed by the City Board to upgrade its primary Wastewater Treatment Plant (WWTP) to include a secondary treatment process that can meet an effluent standard of 20 mg/L of BODs and 20 mg/L of suspended solids (SS). They want to select completely mixed activated sludge system. The BOD5 of the SS is estimated to be 50% of the SS concentration. Assume L:W within 4:1 and maximum depth of 4.5 m and maximum length of 50 m for the tank. Assume the reasonable values of missing parameters from FE Exam Handbook. The effluent characteristics from the primary treatment process are: Flow = 0.150 m's, BOD5 =75 mg/L. Assume the values for the growth constants as K, = 100 mg/L BOD5, Mm = 2.5 d-1, kg = 0.05 d'1. Y = 0.50 mg VSS/mg BODs removed, MLVSS = 2,800 mg/L, MISS - 1.20 (MLVSS), wastewater temperature = 25.0°C. Assume 8% 02 transfer rate and BOD5 to BODu ratio as f = 68%. If SRT (qc) = 14.5 days, the volume of the aeration tank is nearly?
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