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The water supply for a midwestern city contains the following impurities: coarse

ID: 728652 • Letter: T

Question

The water supply for a midwestern city contains the following impurities: coarse sand, finely divided particulates, nitrate ion, trihalomethanes, dissolved phosphorus in the form of phosphates, potentially harmful bacterial strains, dissolved organic substances.

a. Which of the following processes or agents, if any, is effective in removing coarse sand?

b. Which of the following processes or agents, if any, is effective in removing finely divided particulates?

c. Which of the following processes or agents, if any, is effective in removing nitrate ion?

d. Which of the following processes or agents, if any, is effective in removing trihalomethanes?

e. Which of the following processes or agents, if any, is effective in removing dissolved phosphorus in the form of phosphates?

f. Which of the following processes or agents, if any, is effective in removing potentially harmful bacterial strains?

g. Which of the following processes or agents, if any, is effective in removing dissolved organic substances?

Coarse sand filtration, activated carbon filtration, aeration, ozonization, precipitation with aluminum hydroxide, none of the above?

Explanation / Answer

a. Which of the following processes or agents, if any, is effective in removing coarse sand? ozonization precipitation with aluminum hydroxide b. Which of the following processes or agents, if any, is effective in removing finely divided particulates? coarse sand filtration c. Which of the following processes or agents, if any, is effective in removing nitrate ion? aeration ozonization d. Which of the following processes or agents, if any, is effective in removing trihalomethanes? e. Which of the following processes or agents, if any, is effective in removing dissolved phosphorus in the form of phosphates? precipitation with aluminum hydroxide f. Which of the following processes or agents, if any, is effective in removing potentially harmful bacterial strains? coarse sand filtration g. Which of the following processes or agents, if any, is effective in removing dissolved organic substances? aeration ozonization

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