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QUESTION1 A 15-mL sample is added to à 300-ml 8OD bottle. Dilution water is added to the sample bottle and the initi...
4. A 20 mL wastewater sample was mixed with 280 mL deionized (DI) water in a...
4. A 20 mL wastewater sample was mixed with 280 mL deionized (DI) water in a standard BOD bottle. The 5- day BOD test provided an initial dissolved oxygen concentration (DO intial) = 9 mg/L and a final dissolved oxygen concentration (DO final) = 3.5 mg/L. The BOD experiment was carried out at 20°C and the BOD rate constant at 20°C is 0.22/day. a. Find the dilution factor (P) and BODs value at 20°CY b. Find the ultimate BOD of...
5. The following data is for a BOD determination run on a raw sewage sample incubated...
5. The following data is for a BOD determination run on a raw sewage sample incubated for 5 days at 20°C in the dark; calculate the BOD5,20. Raw sewage contains a sufficient population of bacteria to conduct a BOD test. Therefore, this is an unseeded sample. Data: BOD bottle volume mL raw sewage added to BOD bottles DO, in bottle containing waste and dilution water DO in bottle containing waste and dilution water 300 mL 10.00 mL 7.70 mg/L 2.35...
Problem 4 (10 Points). You collect a sample of wastewater and run a BOD test. To...
Problem 4 (10 Points). You collect a sample of wastewater and run a BOD test. To run this test, you mix 25 mL of the wastewater sample with clean (unseeded) dilution water to bring the total volume in the bottle to 300 ml, After measuring the initial dissolved oxygen concentration, you cap the BOD bottle and monitor the dissolved oxygen concentration of the diluted sample in the BOD bottle as a function of time (see Figure below). Previous tests have...
Dissolved Oxygen in Water Sample Question 1. Calculate the dissolved oxygen for 300 ml sample of...
Dissolved Oxygen in Water Sample Question 1. Calculate the dissolved oxygen for 300 ml sample of water that was analyzed using Winkler method with azide modification. The sample were titrated against standard 0.025 N of sodium thiosulphate, and the required volume of sodium thiosulphate to reach the colorless endpoint was 13.5ml. Question 2. A student conducted an experiment to measure the biochemical oxygen demand for 400 ml of waste water. She diluted the sample by adding 600 ml of oxygen...
7. A high-strength industrial waste (approximate BOR = 1600 mg/L) is diluted 10:300 (i.e. 10 mL...
7. A high-strength industrial waste (approximate BOR = 1600 mg/L) is diluted 10:300 (i.e. 10 mL of sample in a 300 mL BOD bottle). Do you expect this dilution to give useable” data for a tBODs calculation? Why or why not?
2. To determine the BOD in an industrial wastewater sample, a seeded BOD analysis was conducted;...
2. To determine the BOD in an industrial wastewater sample, a seeded BOD analysis was conducted; data are summarized in the table below. Ten mL of wastewater was added per 300 mL bottle to determine the dissolved oxygen demand of the aged, settled wastewater seed (test A). The seeded test bottles (test B) contained 2.5 mL of industrial wastewater and 1.2 mL of seed wastewater a) What is the five-day BOD in this industrial wastewater? What is the k-value using...
1) if 5 parts sample is added to 10 parts diluents, what is the dilution that...
1) if 5 parts sample is added to 10 parts diluents, what is the dilution that was just made? 2. What is the ratio if 5 parts sample volume is added to 10 parts diluents volume? 3. In a 1 to 3 dilution, what is the dilution FACTOR? 4. In a 1 to 10 dilution, what is the dilution FACTOR? 5. What is the dilution FACTOR if 40 mcL of sample added to 260 mcL of diluent? 6. What is...
Problem #2 A 100-mL water sample is collected from the activated sludge process of municipal wastewater...
Problem #2 A 100-mL water sample is collected from the activated sludge process of municipal wastewater treatment. The sample is placed in a drying dish (weight-0.5000 g before the sample is added), and then placed in an oven at 104°C until all the moisture is evaporated. The weight of the dried dish is recorded as 0.5625 g. A similar 100-mL sample is filtered and the 100-mL liquid sample that passes through the filter is collected and placed in another drying...
reply ma as soon as possible 120 points total Due: October 23, 2019 Budget your time...
reply ma as soon as possible
120 points total Due: October 23, 2019 Budget your time carefully TRUE OR FALSE (45 points - 3 points cach): Mark whether the statements as written are "true" or "false". If the statement is false, make minor changes to the statement so that the statement is true. The primary adverse health effect resulting from the disposal of mercury wastes into Minamata Bay was dysentery The flow regime in horizontal velocity grit chambers approaches continuous...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...
4. A 20 mL wastewater sample was mixed with 280 mL deionized (DI) water in a standard BOD bottle. The 5- day BOD test provided an initial dissolved oxygen concentration (DO intial) = 9 mg/L and a final dissolved oxygen concentration (DO final) = 3.5 mg/L. The BOD experiment was carried out at 20°C and the BOD rate constant at 20°C is 0.22/day. a. Find the dilution factor (P) and BODs value at 20°CY b. Find the ultimate BOD of...
5. The following data is for a BOD determination run on a raw sewage sample incubated for 5 days at 20°C in the dark; calculate the BOD5,20. Raw sewage contains a sufficient population of bacteria to conduct a BOD test. Therefore, this is an unseeded sample. Data: BOD bottle volume mL raw sewage added to BOD bottles DO, in bottle containing waste and dilution water DO in bottle containing waste and dilution water 300 mL 10.00 mL 7.70 mg/L 2.35...
Problem 4 (10 Points). You collect a sample of wastewater and run a BOD test. To run this test, you mix 25 mL of the wastewater sample with clean (unseeded) dilution water to bring the total volume in the bottle to 300 ml, After measuring the initial dissolved oxygen concentration, you cap the BOD bottle and monitor the dissolved oxygen concentration of the diluted sample in the BOD bottle as a function of time (see Figure below). Previous tests have...
7. A high-strength industrial waste (approximate BOR = 1600 mg/L) is diluted 10:300 (i.e. 10 mL of sample in a 300 mL BOD bottle). Do you expect this dilution to give useable” data for a tBODs calculation? Why or why not?
2. To determine the BOD in an industrial wastewater sample, a seeded BOD analysis was conducted; data are summarized in the table below. Ten mL of wastewater was added per 300 mL bottle to determine the dissolved oxygen demand of the aged, settled wastewater seed (test A). The seeded test bottles (test B) contained 2.5 mL of industrial wastewater and 1.2 mL of seed wastewater a) What is the five-day BOD in this industrial wastewater? What is the k-value using...
Problem #2 A 100-mL water sample is collected from the activated sludge process of municipal wastewater treatment. The sample is placed in a drying dish (weight-0.5000 g before the sample is added), and then placed in an oven at 104°C until all the moisture is evaporated. The weight of the dried dish is recorded as 0.5625 g. A similar 100-mL sample is filtered and the 100-mL liquid sample that passes through the filter is collected and placed in another drying...
reply ma as soon as possible
120 points total Due: October 23, 2019 Budget your time carefully TRUE OR FALSE (45 points - 3 points cach): Mark whether the statements as written are "true" or "false". If the statement is false, make minor changes to the statement so that the statement is true. The primary adverse health effect resulting from the disposal of mercury wastes into Minamata Bay was dysentery The flow regime in horizontal velocity grit chambers approaches continuous...
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