Please give handwriting solution 5. Wastewater is discharged to a river. The initial deficit is 3.8 mg/I. and the initial ultimateBOD is 22 mg/L. The river velocityis 1.3 m/s, the reacration constant is 0.25 d', and thedeoxygenation constant is 0.13 d'.a. What is the dissolved oxygen deficit at a point 16 km downstream of the wastewaterdischarge?b. What is the maximum dissolved oxygen deficit?

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Answered: Wastewater is discharged to a river.…

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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Solve Q 1.(a, b) a. Calculate 1-day BOD and ultimate BOD for a wastewater whose 5- day 20 °C BOD is 737. The reaction constant K= 0.23d -1. Also calculate 3-day BOD at 27°C? b. Calculate μ as a function of μmax for the domestic sewage considering S= 737 mg/l and Ks = 07 mg/l.
A pharmaceutical wastewater needs a minimum BOD/N/P of 100/3.0/0.7 for biological treatment. The wastewater characteristics are BOD = 740 mg/l, suspended solids = 250 mg/l, soluble nitrogen = 10 mg/l, and soluble phosphorous = 5 mg/l. What ammonium nitrate and phosphoric acid additions would you recommend to ensure adequate nutrients for a daily flow of 28 m3/d?
At the point of mixing of a river and a wastewater point discharge, DO is 5.5 mg/L and DOs is 10.1 mg/L. Upstream, the BODu of the river is 3.2 mg/L and its volumetric flow rate is 3.2 m3/s.a) Calculate the maximum allowable volumetric flow rate of the wastewater dischargeif the maximum allowable BODu at the mixing point is 20.0 mg/L. The BODu of the wastewater is 250.1 mg/L.b) For a water temperature of 15 ℃, calculate kd and kr. At 20 ℃, kd is 0.30 per day. The combined stream and wastewater velocity and depth are 2.0 m/s and is 4.0 m.c) Calculate the critical time in days and critical distance in km.d) Calculate the maximum deficit and minimum DO in mg/L
The characteristics of the synthetic textile wastewater are 1500 mg/L BOD, 2000 mg/L SS, 30 mg/L nitrogen, and no phosphorus. The characteristics of the domestic wastewater are 200 mg/L BOD, 240 mg/L SS, 35 mg/L nitrogen, and 7 mg/L phosphorus. Find the nitrogen concentrations in the mixture. The ratio of flow rate is domestic/textile = 4/1
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.
A wastewater with a BOD of 25mg/L is discharged through an outfall to a freshwater stream of mean velocity 0.1m/s. The DO downstream of the outfall is 8.5mg/L. Assume the deoxygenation rate is 0.25/d, the reaeration rate is 0.4 /d and the temperature of 20 degree C (DOs = 9.09mg/L). Compute for the ff: a) Critical distance b) minimum DO c) Oxygen deficit d) Critical time
The DO of a river is 5.9 mg/L just downstream from a wastewater outfall. The mix ofriver and wastewater has a BOD of 25 mg/L. The DOs is 9.2 mg/L and the kd = 0.22 / day. a. estimate the rearation coefficient assuming a river speed of 0.20 m/s and anaverage depth of 3.5 m b. find the critical distance downstream where DO is a minimum c. what percent of BOD has to be removed from wastewater to maintain > 5mg / L DOif it is the only source of river BOD
Assume that taal lake is 100m2 and its average height is 5ft. Wastewater thatflows into the lake are the following: a. Food square kitchen waste 5m3/hr; Total Dissolved Solids (TDS) is 50g/L whichoperates 8hrs per dayb. CIH 5m3/hr kitchen waste; TDS is 20mg/L which operates 4hrs per dayc. PCH 20m3/day diluted laboratory waste ; TDS = 40mg/L (1)Determine the volume of wastewater which taal lake can still be contained withoutrainfall.(2)During operational hours a heavy rain fall, the rain gauge reading is 1.5m. Will the taalLake overflow? What is the volume of water that will over flow?(3). Compute the TDS concentration of the overflow.
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You have a DAF with wastewater flow of 650 L/min, with a solids concentration of 15 g/L. Density of the wastewater is 1100 kg/m3. What air flow is required for an air to solids ratio of 0.3. Assume density of air is 1.2 kg/m3.
A 8.5 ml of sample of wastewater is diluted to 300 ml with distilled water in standard biochemical oxygen demand bottle dissolved oxygen were initial 9.2 mg/l 3 days 8.7 mg/l and after 5 days 6.4 mg/l at 20 c determine the biochemical oxygen demand for three and five days of the wastewater then compute the ultimate BOD assume k=0.12/d
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

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