In Which Phase of Sewage Treatment Are Trickling Filters Sometimes

question 35

Multiple Choice

In which phase of sewage treatment are trickling filters sometimes used?

• A) primary treatment.
• B) secondary treatment.
• C) tertiary treatment.
• D) quaternary treatment.

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Definitions:

Marginal Product

The extra production achieved through the use of an additional unit of a specific input, while keeping all other inputs unchanged.

Wage Rate

The amount of money that an employee is paid per hour, week, or another unit of time for their labor.

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The demand for a good or service that arises from the demand for another good or service.

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