CE208 - Water And Wastewater, BOD And COD With Arrhenius Equation - Engineering Assignment Help

Assignment Task

Q1. Answer the following 

a. Differentiate between BOD and COD? 

b. Briefly discuss how crown corrosion is caused in sanitary sewers? 

c. Briefly discuss three factors that lead to non-Ideal flow conditions. 

d. For what purposes is Arrhenius equation used in wastewater engineering?

e. Explain how inclined-plate settling works. 

Q2. A  water  sample  contains  120.0mg/L !"# and  105.0  mg/L !# at  a  pH  of 

8.  Estimate  the  amount of alkalinity consumed when 190 mg/L of alum is added to the water for precipitation. 

Q3. Calculate the settling velocity Vs of particles over a 65° inclined-plate settler of length Lp = 2.0m  and plate spacing w = 70mm for countercurrent conditions with a uniform water velocity u = 1.1 m/s. 

Q4. For a chlorine contact basin with design discharge of 2000m3/d, the experimental data to find the  optimal chlorine dosage are presented in the tables below. After analyzing  the data,  the amount of  chlorine  to  be  used  was  fixed  at  35.5kg/d.  The  data  suggest  that  Chick-Watson  form  $%! %"=  is applicable  for inactivation  of Giardia, which  has lately  been a  cause  of  concern  for the  locality where the basin is installed. 

1. Calculate free chlorine residual.

2. To achieve 99% Giardia inactivation, what should be hydraulic detention time T of the contact  basin.

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Q5. A complete-mix activated sludge (CMAS) process is used for secondary treatment of effluent from  a primary clarifier. The design influent flowrate to the activated sludge tank is 9 × 10)with a BOD  concentration of 320. The plant operating parameters are as follows: 

Dimensions of the aeration tank: 10.0m wide by 10.0m long by 4.5m deep; effluent BOD = 15.0mg/L;  yield  coefficient  =  0.55mg  VSS/mg  BOD  removed;  endogenous  decay  rate  of  microorganisms=  0.050/d; fraction of biomass that remains as cell debris = 0.15 g VSS/g VSS; half velocity constant =  81g BOD/m3; maximum specific growth rate = 1.15g VSS/g VSS-d; bCOD/BOD ratio = 1.6; nbVSS in  the influent = negligible; operating temperature = 20°C 

Determine: 

a. SRT 

b. Oxygen demand in kg/d 

c. MLVSS in mg/L 

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