Five-days BOD of a 10% diluted samplehaving Do = 6.7 mg/l, Ds = 2 mg/l andconsumption of oxygen in blank = 0.5 mg/l,will be

BOD related data is given as below-To Find-The value of the 5 day BOD for the given data-

Answered: Five-days BOD of a 10% diluted sample…

Five-days BOD of a 10% diluted sample having Do = 6.7 mg/l, D§ = 2 mg/l and consumption of oxygen in blank = 0.5 mg/l, will be

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 BOD analysis was conducted on a partially- treated sewage at 25°C. Only 20% of the volume of BOD test incubator was filled with the sewage, and the dissolved oxygen values listed below were measured. Time Dissolved oxygen (mg/L) time O 1 2 3 4 5 6 Dissolved oxyen (mg/L) 8.5 7.7 6.5 4.8 3.5 ? ? By considering minimum dissolved oxygen at day 6 is valid for BOD test, determine the following: (i) Reaction rate K25. (ii) 25BOD5 from the drawn graph. (iii) 30BOD3. (iv) COD of the sample.
If the saturation concentration of O2 in water is 9.2 mg and the initial concentration is 2.1 mg/L. determine the time it takes for the concentration to become 7.5 mg/L if K2 = 0.25 per day. What is the time required for (Ct) to be 5, 6,8 and 9 mg/L?
QUESTION 4 Adding 20ml sample to a 300ml DO bottle causes its dissolved oxygen concentration to decrease by 10 mg/l. by the end of the first day What is the BOD1 of the sample? Answer mg/L
Determine the suspended solids and the percent volatile matter in a solids sample based on the following data: Sample size 25 mL Tare mass of filter = 1.5325 g Tare mass of filter plus retained solids = 1.5415 g Tare mass of filter plus retained ash = 1.5378 g
Wastewater Engineering civil engineering (10)
An anaerobic digester (AD) is designed with the following data. Organic loading rate 1.0 kg VSS/m³.day VSS load 120 kg/day (i). (ii). Estimate the volume of the AD. If the VSS is 12 kg/m³, estimate the retention time.
6. Please answer the following questions: (a) Why control of pH is considered important and what are the main sources of acidity and alkalinity in natural waters? (b) A 100-ml sample require 20.2 ml of 0.02N H₂SO4 to reach the phenolphthalein end point, and a total of 25.6 ml to reach the Methyl orange end point. Calculate total alkalinity and indicate what fraction corresponds to hydroxides, carbonates and bicarbonates (c) The uptake for a water supply system is located at a location named X3 (see Figure); upstream X3, there are two villages that discharge raw sewage at X1 and X2, and new wastewater treatment systems are needed in both villages in order to reduce the concentration of BOD. Calculate the current concentration of BOD at X3, and the required removal efficiency (% BOD removal) in the new wastewater treatment works (WWTW) to control BOD discharges at X1 and X2, so the BOD at X3 ≤ 10mg/L. QR LR X₁ L₁ X₂ Mg(HCO3)2 = 73; CaCl₂ = 111; L₂ LR= 5 mg/L ; QR= 1000, L/s Q1 = 200 L/s;…
PART B 1. The data are given as follows: Weight of evaporating dish: 53.5430 g Weight of evaporating dish and residue after drying at 103°C: 53.5760 g Weight of filter and residue after drying at 103°C: 1.5530 g Weight of filter and residue after ignition at 550°C: 1.5450 g Volume of sample filtered: 50 mL Volume of sample dried: 80 mL Determine the total solids, volatile suspended solids, suspended solids, fixed suspended solids and total dissolved solids. Assume 60% of suspended solids were loss on ignition.
(a) Sketch a typical Streeter-Phelps oxygen-sag curve and state its limitations. dD (b) The rate of change of the dissolved oxygen deficit, ", is the net effect of the rate of dt re-aeration, given as – k D, and the rate of oxygen utilization, given as k,Le , where ko, ka and Lo are the re-aeration rate constant, the decay constant, and the ultimate BOD, respectively. Write the expression for the rate of change of the dissolved oxygen deficit. Then argue why the maximum deficit, De, occurring at the critical time, to, is given by: ka Le D. k.
Five-days BOD of a 10% diluted sample having Do = 6.7 mg/l, D = 2 mg/l and consumption of oxygen in blank = 0.5 mg/l, will be A 22 mg/l B 42 mg/l c 62 mg/l D 82 mg/l
(₁ ) A PM10 sampler was operated for a period of 24 hours at a flow rate of 0.7 m³/min. The filter tare weight was 1.7911 g, and the dried filter weight after sampling was 1.8521 g. Calculate the PM10 concentration in µg/m³.
The following test results (Table Ql-2) were obtained from a raw water sample. All of the tests were performed using a sample volume of 50 mL. Table Q1-2 Weight (g) Mass of residue after drying at 105 ỏC Mass of residue after ignition at 550 ¿C Mass of residue on Whatman GF/C filter paper after drying at 0.7148 0.3818 0.3571 105 'C Mass of residue on Whatman GF/C filter paper after ignition at 550 'C 0.1418 Calculate the concentration (mg/L) of : (i) total solids. (ii) total volatile solids. (iii) total suspended solids. (iv) total dissolved solids.