in a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolvedoxygen concentration of the diluted sample at the beginning was 6 ppm and itwas 4 ppm at the end of 5 days of incubation at 20°C. the BOD of raw sewagewill be25

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Answered: in a BOD test, 1.0 ml of raw sewage was…

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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PART A Bacteria can be divided according to the dissolved oxygen utilization pattern. Differentiate and explain the three main categories of bacteria involved. 1. A BOD analysis was conducted on a raw sewage sample. 300 mL of sample was placed in a 300 mL BOD bottle, and incubated for 5 days at 20°C. Based on your knowledge on the sample characteristic and BOD procedure, explain about the validity and the outcome of the analysis. 2. 3. Explain why oxygen depletion occurs when organic waste is disposed directly in the lake. And mention ONE adverse impact of oxygen depletion.
In a relative conductivity test, the sewage was incubated for a period of 15 days at 20°C. What is the relative stability in percentage. 90.04 % 99.9% 93.36 % 96.8 %
Enter T next to the following true statements and F next to the false statements. Settling of suspended solids in secondary clarifiers is typical of Type II sedimentation. Thickening prior to digestion is common in many wastewater treatment plants because it reduces the size needed for the digester. Based on a temperature of 30°C, a design mean cell residenee time of about 20 days would be reasonable for a completely-mixed anaerobic digester without recycle. A volatile suspended solid is defined as an organic solid that can be oxidized to CO2 (g) at 250°C. The theoretical yield coefficient can be estimated from the observed yield coefficient if the specific growth rate constant is known. Air flotation would likely be more efficient for thickening waste activated sludge than primary sludge, while the opposite would be true for gravity thickening. The net mass of cells produced in the activated sludge process equals the total cell mass synthesized minus the cell mass wasted as waste…
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 water sample has a pH of 7.25. Determine the concentration of hydroxyl ion in the water sample.
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(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.
Please ans a and b
From water sample, 25 mg/L HCO3" as CacO3, 10 mg/L C032 as Caco3 and 50 mg/L Ca* as CaCO3 were measured. pH was near neutral. What is alkalinity? () mg/L as Cac03 (*Answer in whole number only)
Question 8A 200 g/l solution of common salt was discharged into a stream at a constant rate of 25l/s. The background concentration of the salt in the stream water was found to be 10 ppm. At a downstream section where the solution was believed to have been completely mixed, the salt concentration was found to reach an equilibrium value of 45 ppm. Estimate the discharge in the stream.

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in a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of the diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 days of incubation at 20°C. the BOD of raw sewage will be