Pls help me answer asap for my hydrology subject. Thanks 3. A shallow circular pond of 2 m depth andradius of 50 m is having a water depth of0.5 m. The concentration of phosphorous inthe pond is 2 mg/L. If the pond receivedannual precipitation of 100 mm, what is thechangeconcentration? Assume no phosphorousinthetotalphosphorousconsumption in the pond and concentrationof phosphorous in rainwater is zero.Neglect any losses due to seepage orevaporation of water.

Given data:- Depth of pond (H)=2 m Radius (r)=50 m Depth of water (h)= 0.5 m Concentration of…

Answered: 3. A shallow circular pond of 2 m depth…

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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Water quality and characteristics discuss: 1. Organoleptic parameters 2. Nitrate 3. Solids
A mix of wastewater and river water with a discharge of 10 m3/sec has a BOD5 of 28 mg/L, a DO of 8 mg/L, and temperature 20 Celsius. At 20 Celsius, deoxygenation coefficient is estimated to be 0.32 per day and reaeration coefficient is 0.8 per day. The river reaches the critical- oxygen deficit after 2 days. estimate the 20 Celsius BOD5 of the sample taken at the critical point. O27.398 O20.310 O 29.351 O24.425 O26.264
Problem 7-29 The initial ultimate BOD after mixing of the Noir River is 50 mg/L. The DO in the river after the wastewater and river have mixed is at saturation. The river temperature is 10 °C. At 10 °C, the deoxygenation rate constant ka is 0.30 d-¹ and the reaeration rate constant k is 0.30 d-¹. Determine the critical point to and the critical DO.
21.The waste water treatment plant has dissolved oxygen concentration of 2.8 mg/l and a discharge rate of 1.56 m3/s. The river that is receiving this waste has DO equal to 7.9 mg/l, a flow rate of 9.95 m3/s, and a temperature of 20 °C. Assuming complete anlainstantaneous mixing. Take the saturated value of dissolved oxygen 20C° =9.09 mg/I.The initial amount of dissolved oxygen in the mixture of waste and river would be: a. 5.28 mg/l b. 7.21 mg/l О с. c. 0.71 mg/l d. 17.12 g/l
a. A stream has an average stream velocity of 0.92 [m/s] and an average depth of 1 [m]. Calculate the reaeration coefficient (Kr) at 20 C. b. Assume atmospheric pressure, 20° C temperature, and no stream contamination. Suppose the stream has an average chloride concentration of 5000 [mg/I]. What is the expected dissolved oxygen saturation concentration for the stream? c. With the same assumptions and conditions, the stream is receiving BOD contamination from an unknown source. If you have measured the dissolved oxygen (DO) in this stream and your DO probe reads 6.62 [mg/l]. How much is the DO deficit for this stream?
(a) A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m3 /s. The design TDS concentration of the product water is below 400 mg/L. The net pressure is 40 atm. The membrane manufacturer provides that the membrane has a water flux rate coefficient of 2.2 x 10-6 s/m and a solute mass transfer rate of 1.5 x 10-6 m/s. Calculate the membrane area required for the RO system. (B) A water treatment at Nibong Tebal receiving a raw water contains a concentration of 0.5 µg/m3 atrazine from Kerian River. In order to comply with the drinking water quality guideline, the treatment plant should reduce the concentration of Atrazine to 0.1 µg/L. If the dosing of powdered activated carbon have been applied before the coagulation, calculate the minimal dose of PAC in mg/m3 .
The 750-bed Associated Center of Medical Excellence (ACME) Hospital has a small activated sludge plant to treat its wastewater. The average daily Medical Center discharge is 1,250 L per day per bed, and the average soluble BOD5 after primary settling is 450 mg/L. The aeration tank has effective liquid dimensions of 10.0 m wide by 25.0 m long by 3.5 m deep. The plant operating parameters are as follows: MLVSS = 2,750 mg/L MLSS = 1.25 (MLVSS) Settled sludge volume after 30 min = 250 mL/LDetermine the following: aeration period, F/M ratio, SVI, solids concentration in return sludge.
A dual media filter is composed of 0.30 m anthracite (mean particle size 0.20 mm) that is placed over a 0.60 m layer of sand (mean particle size 0.70 mm) with a filtration rate of 9.78 m/h. Assume the grains sphericity ф = 0.75 and porosity (ε) = 0.40. Estimate the head loss in the clean filter?
A factory with a wastewater flow of 0.011 m³/s and a BOD; of 590 mg/L discharges into a small stream. The stream has a minimum dry season flow of 1.7 m/s. Upstream of the factory, the BOD; of the stream is 0.6 mg/L. The BOD rate constants ka at 20 °C are 0.115 di for the factory wastewater and 3.7 di for the stream. The temperature of both the stream and the factory wastewater is 20 °C. After mixing, the D0 was 6.3 mg/L, the velocity was 0.1 m/s, the mean depth was 2.5 m and the decay constant, ka , was 0.75 d. a. Calculate the initial ultimate BOD after mixing (HINT: First find Lo in each flow] b. Determine the time when the critical DO occur: c. Where does the critical DO occur?' d. Determine whether any fish migration will occur if they require a DO level of at least 3 mg/L in their habitat.
A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m³/s. The design TDS concentration of the product water is below 400 mg/L. The net pressure is 40 atm. The membrane manufacturer provides that the membrane has a water flux rate coefficient of 2.2 x 10-6 s/m and a solute mass transfer rate of 1.5 x 10-6 m/s. Calculate the membrane area required for the RO system.
A dual media filter contains 0.4 m of sand with effective size 0.55 mm and 1.4 m of anthracite with effective size 1.2 mm. The sand and anthracite have density of 2650 kg/m³ and 1700 kg/m³, respectively. Determine if the media in the filter are properly matched. O Yes, the media are properly matched. O No, the media are not properly matched. O Cannot be determined using the given information.
Question 2 A factory with a wastewater flow of 0.011 m/s and a BOD5 of 590 mg/L discharges into a small stream. The stream has a minimum dry season flow of 1.7 m/s. Upstream of the factory, the BODS of the stream is 0.6 mg/L. The BOD rate constants ka at 20 °C are 0.115 di for the factory wastewater and 3.7 d1 for the stream. The temperature of both the stream and the factory wastewater is 20 °C. After mixing, the DO was 6.3 mg/L, the velocity was 0.1 m/s, the mean depth was 2.5 m and the decay constant, ka , was 0.75 d. a. Calculate the initial ultimate BOD after mixing (HINT: First find Lo in each flow). b. Determine the time when the critical DO occurs c. Where does the critical DO occur? d. Determine whether any fish migration will occur if they require a DO level of at least 3 mg/L in their habitat.

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3. A shallow circular pond of 2 m depth and radius of 50 m is having a water depth of 0.5 m. The concentration of phosphorous in the pond is 2 mg/L. If the pond received annual precipitation of 100 mm, what is the