PART ABacteria 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 placedin a 300 mL BOD bottle, and incubated for 5 days at 20°C. Based on your knowledgeon the sample characteristic and BOD procedure, explain about the validity and theoutcome of the analysis.2.3.Explain why oxygen depletion occurs when organic waste is disposed directly in thelake. And mention ONE adverse impact of oxygen depletion.

"Since you have asked multiple questions, we will solve the first question for you. If you want any…

Answered: Bacteria can be divided according to…

Bacteria can be divided according to the dissolved oxygen utilization pattern. Differentiate and explain the three main categories of bacteria involved. 1.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

H Gy Q#4:The table shows data of a wastewater sample collected from a river with a temperature of 30 °C analyzed for the BODs test. The rate constant is 0.2 day-¹ at the lab temperature (20 C). Find BODs at the river. Initial dissolved oxygen, mg/L 9 What will be the BOD7 at the river? Final dissolved oxygen, mg/L 3.5 Sample volume, ml 35
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 20.2ml of 0.02 NH2SO4 to reach the phenolphthalein end point, and a total of 25.6ml 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.
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;…
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)
Determine the ultimate BOD of a waste water sample which was subjected to the BOD determination as follows: 6 mL of waste water containing no dissolved oxygen (D.O) was mixed with 294 mL, of dilution water containing 8.6 mg/L of D.O. After incubation at 20° C for 5 days, the D.O. of the mixture was 5.4 mg/L. The BOD rate constant, k to the base e is 0.25/d.
Determine the exact and approximate alkalinity of a water sample that contains 120.0 mg/L of (CO3)^2- and 75.0 mg/L of (HCO3)^- at a pH of 9.7 at 25 degrees Celcius
Suppose the estimated BOD of an influent sample is expected to be 150 mg/L and the dissolved oxygen concentration of the oxygen saturated dilution water used in the BOD test is 8.5 mg/L. If you are using a 300 mL BOD bottle, estimate the maximum and minimum amount of sample you would add to the BOD bottle to ensure satisfactory test results. NOTE: Acceptable BOD test should comply with the two essential criteria: DO final ≥ 2 mg/L and DO initial – DO final ≥ 2 mg/L. Assume that the dilution water is the only source of oxygen.
For the measurement of the BOD of a wastewater sample from textile industry, five different dilutions (0.5%, 1%, 2%, 5% and 10%) of 1 L are prepared, with the addition of 2 mL of seed. Three different dilutions (0,5%, 2% and 5%) are used for seed corrections. The results of DO measurements are given below. Calculate the BOD5 concentration of the sample.
2.62. Four water samples have been analyzed for coliform bacteria using the MPN test procedure. From the results given below, calculate the MPN of each sample using (a) the Poisson equation [Eq. (2.90)], (b) the MPN tables given in Appendix G, and (c) the Thomas equation [Eq. (2.91)]. SAMPLE DILUTION 10.00 1.00 0.10 0.01 0.001 0.0001 Sample A 324 2 4 NUMBER OF POSITIVE TUBES Sample B 5 5 543255 5 2 Sample C Sample D 5 5 4 4 5 5 5 2 0
Question 2 A group of environmental chemists (Kuhn et al., 2015, Environ. Engineering Science 32(1):54-65) reported on une analysis of natural organic matter (NOM) from Nelson's Creek in the Upper Peninsula of Michigan. The creek water was at a pH of 5.5 and contained 28 mg C/L. Researchers had run a large quantity of water through a reverse osmosis (RO) filter and a cation-exchange column (like a water-softener) designed to keep the RO filters from clogging with CaCO3. The NOM they gathered had a Mg content of 8.32 mg Mg/g C. If the NOM is 44.9% C, then what is the Mg content of the NOM in mg Mg/g NOM?
The concentration of dissolved oxygen in a sample of waste water decreases from 9 x 10^3 g/L to 6.2 x 10^3 g/L after five days. Determine the BOD of the sample in mg/L.
In the lead content analysis of a wastewater sample, 50.00 mL of the original sample was taken and diluted with 150.00 mL deionized water. The diluted sample was found to have a lead content of 17.8 ppb. What is the lead content (in ppb) of the original wastewater sample? DENSITY VALUES AT 25°C Ethanol: 0.789 g/mL Acetic Acid: 1.05 g/mL Water: 0.997 g/mL