You and your team have decided to build an aerated lagoon to treat the waste generated by a localvillage in a developing country. You estimate that the influent flow rate will be around 40 m³/d andthe BOD5 roughly 250 mg/L. To avoid impacting the river that will receive the effluent, the BOD5must be reduced to 15 mg/L. Based on your experimental lab work, you have determined thefollowing microbial kinetic parameters:=Ks 100 mg-BOD5/Lka = 0.1 d¹μm = 1.6 dY = 0.6 mg-VSS/mg-BOD5(a) To meet the effluent BOD5 limit, what must the hydraulic retention time (HRT) be in the lagoon?(b) What mass of microbes will be produced in the lagoon each day? How could this be problematicfor the operation of the lagoon?

Given:Q = 40 m^3 / daySo = 250 mg / L , BOD5S = 15 mg / L, BOD5Ks = 100 mg-BOD5 / Lkd = 0.1 d^-1mu =…

Answered: You and your team have decided to build…

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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A cheese production facility in Winchester Ontario is having problems meeting the Provincial discharge limit of 25 mg/L BOD;. The facility produces and discharges 200 m³/d of wastewater with an influent concentration of 5,000 mg BODS /L. The current well mixed aerated lagoon has an operating volume of 10,000 m². What is the effluent concentration with the current system? What increase in volume is required to meet the discharge limit? The kinetic rate for BOD reduction is 0.5 d1. State any assumptions.
Question 1 If the waste with BOD4-30 equal 150 mg/l and K1-20 0.23/day is discharge to a stream At an average temperature 30 C.0 = 1.047 A. compute the BOD would de exerted in 5 days at temperature 20 and 30 C (BODS-30, BODS-10). 8. compute the organic loading in (kg/day) for BOD 5-20 lf the flow rate 35 m3/1 Question 2 if the waste with ultimate BOD, equal 190 mg/L and K 1-20 0.23/day is discharge to a stream at an average temperature 25°C. a. compute the BOD would be exerted In 3 and 5 days at temperature 20 and 25° C, (BOD3-20), BOD 5-20, (BOD 3-25 ), BOD -25 ? b.compute the organic loading in (kg/day) for BOD 5-20 If the flow rate 50 m3/h? Question 3 بحبواب uses a single stage rock-media trickling filter for Secondary treatment, A wastewater treatment plant flow rate 2000m3/day concentration of BOD in raw sewage = 400 mg/! 30% BOD removed in primary sed. volume of filter = 169.65 m3. direct recirculation pump operates at 2.78 m3/min to the filter fined the efficiency of T.F and the…
Problem 3: A manufacturer of beef sticks produces a wastewater flow of 2000 m'/day containing 120,000 mg/L salt. It is discharging into a river with a flow of 34,000 m'/day and a salt concentration of 50 mg/L. The regulatory agency has told the company to maintain a salt level of no greater than 250 mg/L downstream of the discharge. a. What recovery of salt must be accomplished in the plant before the waste is discharged? b. What could they do with the recovered salt? Suggest alternatives.
PROBLEM #1 A stream receives a waste outfall which results in oxygen at saturation levels when mixed. The initial condition right after entry of the waste creates a BOD5 of 40 mg/l. KBOD is 0.3/day and KO2 is 1.3/ day. The stream temperature is 12 degrees centigrade. In terms of travel time when does the maximum DO sag occur? What is the minimum DO concentration in the river at the maximum sag point? If the average stream velocity is 3 feet per minute, what is the downstream location of the DO sag minimum relative to the location of the waste stream? Use the relevant equations provided in the textbook to solve this problem. Hint: Consider carefully what was stated in class about the BOD input for this type of problem.
A waste with a 5-day BOD (BOD)=200mg/L and k = 0.1 day¹ is discharged to a river at a rate of 1 m/s. The river has flow rate of 9 m/s and a background ultimate BOD (Lo) of 2 mg/L upstream of the discharge. (a) Calculate the ultimate BOD (Le) of the waste. (b) Furthermore, assuming instantaneous mixing after discharge, calculate Lo of the river water after it has received the waste. Ans.: (a) Ultimate BOD of wastewater = 508.3 mg/L, (b) Ultimate BOD of river water after discharge of waste-52.63 mg/L.
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A Granulated Activated Carbon (GAC) adsorption laboratory column 10cm in diameter and 3m deep, is found to produce good results in COD removal when operated at a flow of 50L/h. The porosity of the GAC is 0.5 Calculate the following: You need to design a GAC system consisting of two columns in series for treating the same water at a rate of 0.5 ML/d. Practical considerations limit the diameter of the columns to 3m. Calculate the minimum required height of the columns. Area=7.854×10−3m3 Volume= 6.3660m/hr t=0.47123 Q=2.122 bed volume /hr
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