3.1 If the rate of wastewater generation is 150 gpcd, for a home with 4 persons, what is the minimum sizeof septic tank needed to treat its wastewater? a) 325 ft³b) 625 ft³ c) 152 ft³d) 161 ft³3.2 If the measured air pollution with CO is 90 mg/m³, what is the concentration in ppm in standardtemperature 25 °C.a) 79 ppm b) 89 ppmd) 251 ppmc) 141 ppm

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

Answered: 3.1 If the rate of wastewater…

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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Wastewater that has a volumetric flow rate of 0.4 m3 /s and an ultimate BOD of 25.0 mg/L is flowing into a river that has a volumetric flow rate of 4.0 m3 /s and an ultimate BOD of 2.0 mg/L. The dissolved oxygen content for the wastewater and the river is 0.80 mg/L and 8.0 mg/L, respectively. What is the dissolved oxygen concentration just after mixing? If the temperature of the river is 17oC, what is the initial deficit?
QUESTION: An aerated lagoon wastewater treatment is to be designed for a municipal wastewater. The design population is 5000 persons, and the aerated lagoon is to provide secondary treatment. Pertinent data are: flow = 380 L/cap-d, influent BOD5 = 255 mg/L; effluent BOD5 = 20 mg/L, K = 2.18 d-1 oxygen required 1.6 kg O2/kg BOD5 applied to the lagoons, and the primary clarifier removes 33 % of the influent BOD5. Calculate the total lagoon volume (m3)
Q2: A municipal wastewater treatment plant discharges secondary effluent to a river. The worst condition occurs in the summer when the treated wastewater in summer is found to have a maximum flow rate of 10000 m³/day, a BODs of 30 mg/L, dissolved oxygen concentration of 1.5 mg/L and temperature of 25°C. At upstream of the disposal point the minimum flow in the stream is 0.65 m³/sec with BODs of 3.0 mg/L, dissolved oxygen concentration of 7.0 mg/L and temperature of 22°C. The mixing of wastewater and stream is almost instantaneous at the point of disposal and velocity of the mixture is 0.2 m/sec. The reaeration constant is estimated to be 0.4 per day at 20°C the dissolved oxygen sag curve a (100-km) (D20,40,50,75,100) temperature. Determine and sketch reach of the stream below the discharge?. Do
Question 4. An industrial process produces a by-product compound ‘X’ which exceeds the sewer use limit. Therefore, before the wastewater can be discharged to the sewer, the concentration of ‘X’ must be reduced to below 30 mg C/L. The industrial wastewater, with a concentration of 1780 mg C/L, flows through a long series of channels before reaching the treatment reactor. The long series of channels can be modelled as a PFR with a volume of 23 m3 and the treatment reactor can be modelled as a CSTR with a volume of 15 m3. The compound ‘X’ naturally degrades in the series of channels before the treatment reactor with a reaction rate constant of 0.75 mg/(L·min). In the treatment reactor the addition of chemicals and catalysts cause compound ‘X’ to degrade according to second order kinetics described with a reaction rate constant of 0.015 L/(mg·min). a) Derive the appropriate HRT equations for the PFR channels and the CSTR treatment reactor (state all assumptions and show all work). b) Does…
Problem: 1. Design a facultative pond to treat (13500)gpm of sewage having (13500/20)mg/L of BOD. The average summer and winter temperature is 43oC and 13oC, respectively. Convert the same pond into aerated lagoon, if the concentration of influent BOD reaches to (13500)mg/L. 2. Determine the diameter of a trickling filter for a wastewater flowing at the rate of (13500)m3/day. The influent BOD (So) concentration for the wastewater is (13500 * 10)mg/L, whereas desirable effluent BOD should be as per NEQS.
(a) What happens to your wastewater? Describe the wastewater treatment facilities that serve your residence at either home or school. The description should list the individual unit processes that comprise the treatment system and what each process accomplishes.
A domestic wastewater with BOD5 of 205 mg/L is treated by a secondary treatment plant that removes 85% of the BOD. You are to run a five-day BOD test with a standard 300-ml bottle on the treated sewage without seed. Assume the initial DO is 9.2 mg/L. (a) (b) What maximum volume of treated sewage should you put in the bottle if you want to have at least 2.0 mg/L of DO at the end of the test (filling the rest of the bottle with water)? If you make the mixture half water and half treated sewage, what DO would you expect after five days?
i). A town produces 8 million litre of sewage per day. BOD of sewage is 260 mg/L, it is to be discharged into a river flowing at a rate of 0.2 m³/s and it's BOD is 5 mg/L. Find out the BOD of river after mixing? [Assume mixing is instantaneous]
Design an activated sludge system for the wastewater flowing at the average rate of (10650)GPM having (10650/500)mg-BOD/L. Also determine the amount of air (m3/min), power (kW) and major nutrients (kg/day) required by the process for 80% BOD removal. Assume any missing data. Subject: environmental engineering 2
As an operator of a wastewater treatment facility, you have learned that your plant runs well at an SRT (based on MLVSS (X) in the aeration basin) of 12 days. If today’s MLVSS (X) concentration is 2,700 mg/L and the RAS (Xr) concentration is 5,500 mg/L, how many L of sludge should you waste from the secondary clarifier today? Other design conditions: Average influent flow = 12,000 m3/d Influent soluble BOD = 150 mg/L Required effluent TSS = 30 mg/L Aeration tank Volume = 1,000 m3
Please calculate the theoretical OD, COD, and ultimate BOD of a wastewater containing (a) 500 mg/L acetate (CH3COOH), which is fully biodegradable; or (b) 500 mg/L oil (C40H80), which is not biodegradable.
Assume that DLSUD lake is 100m2 and its average height is 5ft. Wastewater that flows into the lake are the following: Food square kitchen waste 7 m3/sec; Total Dissolved Solids (TDS) is 25,000 mg/L which operates 8hrs per day CIH 5m3 /hr kitchen waste; TDS is 20mg/L which operates 4hrs per day PCH 20m3 /day diluted laboratory waste ; TDS = 40mg/L (1)Determine the volumetric flow rate of the lake water can still accommodate prior to rainfall.

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