Q4: A wastewater treatment plant as shown:The surface area of each unit 800 m². Depth of each unit 2 m. and %BOD removal inPrimary and Secondary sedimentation tanks = 25%. Find:1- Total % BOD removal in the plant.2- BOD removal in the Trickling filter.3- The flow rate (m³/d) in the plant.r-150%BOD, 180 mg/lPri. sed. tankRiverBOD,-20 mg/1Trickling filterSec. sed. tank(25 marks)

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Answered: Q4: A wastewater treatment plant as…

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) An industry has decided to treat its process wastewater in a biotower with a plastic modular medium (n = 0.55). The flow rate of the wastewater is 1400 m3 /d with a BOD5 of 630 mg/l. Average summer and winter temperatures are 22°C and 15°C, respectively. The treatability constant is 0.04 min–1 for the system at 20°C. Depth of the medium is 4 m. Calculate the area of the biotower required to produce an effluent with a BOD5 of 20 mg/l, with a recycle ratio of 2:1. b) Rework problem a) using a winter recirculation ratio of 3:1.Summer recirculation ratio remains the same at 2:1. Comment onthe pros and cons of using a higher recirculation ratio
(a). An anaerobic rectangular waste stabilization pond is treating a poultry wastewater with the following design data. Aerial Organic Loading BOD load Depth Length: Width ratio BOD (i). (ii). 495 kg BOD/ha.day 395 kg/day 2 m 3:1 (at Top Water Level, TWL) 700 mg/L. Calculate the incoming flow in m³/day. If the length and width at the based of the tank is 0.9 length and 0.9 width at TWL, evaluate the retention time of the pond.
Q1: The design flow for a water treatment plant (WTP) is 1 MGD (3.8x10 m³ /d). The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mg/L. The theoretical mean hydraulic detention time of the tank will be 1 minute. Determine the following: a) the quantity of alum needed on a daily basis in kg/d, b) the dimensions of the tank in meters for a tank with equal length, width, and depth, c) the power input required for a G of 900 sec' for a water temperature of 10 °C. Express the answer in kW, given that u = 1.307 × 10³Kg/m.s.
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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.
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Q4: River mixes with wastewater resulting in BOD5-10.9 mg/l, DO=7.6 mg/l. The mixture has a temperature=20 °C, K₁=0.2 day¹, average velocity=0.3 m/sec. average depth of the river-3 m and dissolved oxygen saturated=9.1 mg/l. Find the min. value of dissolved oxygen in the river.
D Q1: Design an activated sludge process to treat a wastewater of 15000 m³/day with a BOD5 of 180 mg/l following primary treatment. The effluent BODs and SS are to be 20 mg/l. Assume Xr-15000 mg/l, X=2500 mg/l, ec=10 days, y=0.60, Kd=0.05. Determine the reactor volume, the sludge production rate, the circulation rate, the hydraulic retention time and oxygen required?
Chemistry A sewage treatment plant discharges 4 ML/d of effluent with 20.17 mg/L BOD5 into a stream. The stream discharge is 12 ML/d, and its initial BOD5 is 6.10 mg/L. The initial DO of the wastewater is 2.10 mg/L and in the stream, it is 7.91 mg/L. Assume the stream velocity is 0.31 m/s and the dissolved oxygen saturation concentration is 8.76 mg/L. The kd = 0.15 d-1 and kr = 0.31 d-1 values have been adjusted for temperature. Calculate the minimum DO in the stream and determine the distance (km) downstream that this minimum occurs. Is this a safe level for fish?
C. What is the concentration UI SUINUS 5. Determine the size (diameter and depth) of the secondary clarifier (s) at a municipal activated sludge treatment facility: The wastewater flow is 25,000 m³/d, the recycle ratio (recycle sludge flow/wastewater flow) is 0.25. The suspended solids concentration is assumed to be 2500 mg/L in the activated sludge tank. The over flow rate is 50 m3/d- m2 and solids loading is 125 kg/d-m2. Estimate detention time if the depth is 4.5 m. What would be the weir loading? Department of Civil & Environmental Engineering P.O. Box 519 Mail Stop 2510, Prairie View, Texas 77446 w.pvamu.edu Phone (936) 261-1660/1665(dept) Fax (936) 261 1662 Ensuring o Using Zoom o
Determine the size (diameter and depth) of the secondary clarifier (s) in a municipal activated sludge treatment facility: The wastewater characteristics are: Population 250,000, Average per-capita flow rate = 380 1/capita-day and Peak factor = 2.2. The suspended solids concentration is assumed to be 2500 mg/L. The over flow rate is 110 and 60 m3/d-m2 for peak flow and average flow respectively and solids loading at average flow is 110 kg/d-m2. Estimate detention time if the depth is 4.5 m. What would be the weir loading? Also answer the following questions. (hint : you should use all 3 loading criteria) a. How many kilograms of solids are loaded onto each clarifier per day? b. If the removal efficiency is 65% then how many kilograms of solids are removed from the total flow per day? C. What is the concentration of solids in the wastewater leaving the clarifier? Determine the size (diameter and depth) of the secondary clarifier (s) at a municipal activated sludge treatment facility:…
Q1:) A circular coagulation basin has a diameter of 2.5 m and it's depth equal to 1.60 m. If the following data are available: Gt=27000, t-30 s, μ-1.003× 10³ kg/m.s,alum dosage=50 mg/l, determine: a) The required mixing power in unit of (kW). b) The daily quantity of alum added in unit of (kg/d). Q2:) The flow described in (Q1) above is to be flocculated in a basin having four flocculators with transverse paddle units. The basin may be a maximum of 6 m wide and 4 m deep to connect to the settling basin. Determine: (1) Basin dimensions: (2) power requirements. μ= 1.002× 10³ kg/m.s The best Gt value for the system has been found to be 5 x 104, and the G value is 40 s¹.

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