You are provided with the following information about a municipal wastewater treatment plant. This plant uses the traditional activated-sludge process. Assume the microorganisms are 46 percent efficient at converting food to biomass, the organisms have a first-order death rate constant of 0.04/day. There are 150,000 people in the community (their wastewater production is 225 L/day-capita, 0.1 kg BOD5/capita-day). The effluent standard is BOD5 = 20 mg/L and TSS = 20 mg/L. %3D Suspended solids were measured as 4,300 mg/L in a wastewater sample obtained from the biological reactor, 15,000 mg/L in the secondary sludge, 200 mg/L in the plant influent, and 100 mg/L in the primary clarifier effluent. Volume is 4.6 million liters. Assume 30% of incoming BOD is removed during primary treatment so 70% reaches the aeration basin. What is the mean cell residence time in days?

You are provided with the following information about a municipal wastewater treatment plant. This plant uses the traditional activated-sludge process. Assume the microorganisms are 46 percent efficient at converting food to biomass, the organisms have a first-order death rate constant of 0.04/day. There are 150,000 people in the community (their wastewater production is 225 L/day-capita, 0.1 kg BOD5/capita-day). The effluent standard is BOD5 = 20 mg/L and TSS = 20 mg/L. %3D Suspended solids were measured as 4,300 mg/L in a wastewater sample obtained from the biological reactor, 15,000 mg/L in the secondary sludge, 200 mg/L in the plant influent, and 100 mg/L in the primary clarifier effluent. Volume is 4.6 million liters. Assume 30% of incoming BOD is removed during primary treatment so 70% reaches the aeration basin. What is the mean cell residence time in days?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: Waste, measured as BOD, is removed according to first order kinetics at a rate constant of 0.4…

A: We knowBODt=BODY1-e-ktso for ·%BODtBODy=100-80=20%so,0.2=1-e-0.4tt=1.9348min

Q: It is estimated that the BOD of raw sewage received at a treatment plant serving a population 20,000…

Q: 1. To finish the design of the effluent discharge channel, determine the amount of activated carbon…

A: Step 1: try to write down equation Step 2: simple mole calculation Step 3: weight of carbon Step…

Q: The influent of a sewage treatment plant has a TSS concentration of 118 mg/L. What is the…

A: Given that: TSS Concentration in influent sewage = 118 mg/LTSS removal…

Q: Select the most suitable treatment for wastewaters given below. answer for the treatment of each…

A: Waste Water Optimum Treatment Explanation 50 mg/L NO3-N Ion-exchange The ion exchange measure for…

Q: A wastewater treatment plant must disinfect its effluent before discharging the wastewater to a…

A: Given data: Initial concentration of California colony (Co) = 5.5 x 105 CFU/L. Maximum California…

Q: 11.61 A 4.0% sodium fluoride solution is applied to increase the fluoride concentration from 0.4 to…

A: Given, Strength = 4% Initial fluoride = 0.4 mg/L Final fluoride = 1 mg/L

Q: ENVIRONMENTAL ENGINEERING (Practice Questions) a). State the Ultimate Carbonaceous Oxygen Demand…

A: ii)

Q: The wastewater having an organic concentration of 54 mg/l is flowing at a steady rate of 0.8 m³/day…

A: Given data- Organic concentration- Lo=54 mg/L,Q=0.8 m3/day,dimension 2 m×4 m×2 m.decay constant…

Q: Q- If the average sewage from a city is 40x106 l/day and the ar standard of 80 mg/day per capita at…

Q: Q - If the average sewage from a city is 40×106 l/day and the average 5-day BOD is 200 mg/l against…

Q: A Jordanian city of 15000 inhabitants generates wastewater at a rate of 80L/day/person. If the city…

A: Population= 15000 Wastewater flow = 85 m3/day COD= 300 mg/L N= 72 mg/L wastewater rate =80…

Q: 3.1 If the rate of wastewater generation is 150 gpcd, for a home with 4 persons, what is the minimum…

A: 3.1 If the rate of waste water generation is 150 gpcd, for a home with 4 persons, what is the…

Q: An aerobic reactor receives wastewater at a flow rate of 400 m³/d having a COD of 1800 mg/1. The…

A: An aerobic reactor-Wastewater flow rate=400 m3/d=400x103 L/dCOD=1800 mg/LEffluent COD=300…

Q: The 8-day, 20°C BOD of a wastewater (K = 0.27 /day) is 247 mg/L. What is the ultimate BOD (BODy, Lo,…

A: Given 8 day BOD = 247 mg/lConstant = 0.27 /dayTo find out Ultimate BOD

Q: Consider an activated sludge WWTP (wastewater treatment plant). Influent comes in at 28 million…

A: As per guidelines, we are supposed to answer only first 3 sub-parts. Kindly repost other parts in…

Q: A community has a current population of 25,000. 10 years ago, the population was 18,500 and the…

A: Given:- The current population of a community = 25000 The population of the community 10 years ago =…

Q: A domestic wastewater with BOD5 of 205 mg/L is treated by a secondary treatment plant that removes…

A: Given:- BOD5= 205 mg/L, the Secondary Treatment Plant removes 85% of BOD. Initial Do (Doi) =9.2…

Q: A city discharges 100 cumecs of sewage into a river, which is fully saturated with oxygen and…

Q: Q - If the average sewage from a city is 40×106 l/day and the average 5-day BOD is 200 mg/l against…

A: Average sewage = 40 × 106 l/day Average 5-day BOD = 200 mg/l Average standard BOD = 80 mg/day/capita…

Q: Q - If the average sewage from a city is 40x106 l/day and the average 5-day BOD is 200 mg/l against…

A: Average sewage from city = 40 x 106 L/dayAverage 5-day BOD=200 mg/LStandard BOD=80 mg/day at 20oCTo…

Q: If the BOD of a municipal wastewater at the end of 7 days is 60 mg/L and the ultimate BOD is 85.0…

Q: der at the Lemieux Island WTP breaks down. As sho flows into a 5 km long distribution pipe. The…

A: Solution- No. of people = 190,000 volume used by each people = 200 litre/day discharge = Q=…

Q: pharmaceutical wastewater needs a minimum BOD/N/P of 100/3.0/0.7 for biological treatment. The…

A: To find:ammonium nitrate and phosphoric acid additions

Concept explainers

Biological Processes

Biological solid waste includes bacterial and contaminated waste produced by living individuals. Its treatment is essential to prevent the spread of any air-borne or water-borne diseases or diseases transmitted from one organism to another in a food chain. There are many benefits of the biological solid waste treatment and some of them are: the minimized quantity of waste substance, waste control, eradicating any disease-causing pathogens, generation of biogas, composting, anaerobic digestion, bio drying, mechanical biological treatment, microbial fuel cell, phytoremediation, and biofiltration. The final products of the biological solid waste treatment may be recycled to obtain organic fertilizers or disposed of in SWDS (Solid Waste Disposal Site) after proper treatment.

Question

You are provided with the following information about a municipal wastewater
treatment plant. This plant uses the traditional activated-sludge process. Assume the
microorganisms are 46 percent efficient at converting food to biomass, the
organisms have a first-order death rate constant of 0.04/day. There are 150,000
people in the community (their wastewater production is 225 L/day-capita, 0.1 kg
BOD5/capita-day). The effluent standard is BOD5 = 20 mg/L and TSS = 20 mg/L.
Suspended solids were measured as 4,300 mg/L in a wastewater sample obtained
from the biological reactor, 15,000 mg/L in the secondary sludge, 200 mg/L in the
plant influent, and 100 mg/L in the primary clarifier effluent. Volume is 4.6 million
liters. Assume 30
of incoming BOD is removed during primary treatment so 70%
reaches the aeration basin. What is the mean cell residence time in days?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

The 5-day, 20°C BOD of a wastewater (Ke = 0.23/day, 0 = 1.047) is 185 mg/L. What is the corresponding 10-day demand and ultimate BOD (in mg/L)? If the bottle had been incubated at 33°C, what would the 5-day BOD value have been?
A sample of diluted wastewater (diluted 10 times) has a 5-day biological oxygen demand (BOD) of 5 mg/L. If the rate constant is 0.1/d, assuming a first-order chemical reaction, the ultimate BOD of the original wastewater is most nearly (A) 0.50 mg/L (B) 5.0 mg/L (C) 13 mg/L (D) 130 mg/L
A city wishes to discharge wastewater primary effluent to a river which supports a trout. The state requires the city to show that the trout population is protected. Trout require a minimum of 4 mg/l of dissolved oxygen to survive. Determine the minimum downstream dissolved oxygen concentration from the following information about the wastewater discharge and river. Does the minimum dissolved oxygen concentration meet the requirements? Wastewater discharge=0.45m3/s, river flow rate= 8.5 m3/s, river cross-sectional area=19m2, dissolved Oxygen concentration in the wastewater= 0.2mg/l, dissolved oxygen content of the river upstream = 8.1mg/l, saturation dissolved oxygen concentration at 20 C= 9.0 mg/l, BOD concentration in wastewater = 85 mg/l, BOD concentration upstream in the river= 0.2 mg/l, BOD decay constant = 0.2 d-1, and the reaeration constant for the river= 0.4 d-1.
An industry generates 4 million gallons per day (MGD) (that is 15,000 m^3/ day) of liquid industrial wastewater having BOD5 of 1000 mg/L and first order reaction rate constant of 2.0/day. Because of the high BOD, there is a plan to build an industrial pre-treatment system at an industrial park. Effluent from the pre-treatment will be discharged into the city sewer for final polishing at the city wastewater treatment plant. Determine: a. Percent BOD removal if the wastewater is treated in one 5000 m^3 continous flow stirred tank reactor. b. Percent BOD removal if the wastewater is treated in one 5000 m^3 plug flow reactor. c. Percent BOD removal if the wastewater is treated in one 2500 m^3 continous flow stirred tank reactor followed by one 2500 m^3 plug flow reactor. d. Percent BOD removal if the wastewater is treated in one 2500 m^3 plug flow reactor followed by one 2500 m^3 continous flow stirred tank reactor. e. Percent BOD removal if the wastewater is treated in one 2500 m^3…
For the following wastewater and biomass characteristics: Q0 = 50 m3/d S0 = 60 mg NH4+-N/l Xi0 = 20 mg/l k= 2.5 mg NH4+-N/mg VSS-d K = 1 mg/l Y = 0.34 g VSS/g NH4+-N b = 0/day Calculate the volume of the CSTR required for 50 and 98% removal of ammonia by oxidation to nitrate.
You are constructing a sewage lagoon with a 3,100 m3/day inlet/outlet flow rate. You must attain a BOD outflow load of 12 mg/L given a BOD inlet load of 26 mg/L. BOD has a half-life of 2.4 days.What volume is needed for the lagoon and how long would it take for the output BOD concentration to reach 1 ppm if freshwater started to replace the wastewater that was previously entering the lagoon?
The average domestic wastewater flow is 108 gallon per capita per day (gpcpd), containing TSS concentrations in wastewater of 244 mg/L. How many pounds of TSS produced per capita per day.