What are the principles involved in removing biological nutrients from waste, and what is accomplished by doing so? Where do nitrogen and phosphate go in the process?
What will be an ideal response?
Biological nutrient removal is the removal of the dissolved inorganic material (also called biological nutrients) from wastewater. This process removes the nutrients that can cause cultural eutrophication. "For the biological removal of nitrogen . . . the activated-sludge system is partitioned into zones, and the environment in each zone is controlled in a manner that promotes the denitrifying process." The nitrogen is released to the atmosphere. "In an environment that is rich in oxygen, but relatively lacking in food . . . bacteria take up phosphate from solution and store it in their bodies. Thus phosphate is removed as the excess organisms are removed from the system."
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The number of grams of water vapor in a cubic meter of air is called the:
A) vapor pressure. B) specific humidity. C) relative humidity. D) absolute humidity.
The amount of solar radiation reaching the Earth's surface is dependent on:
a. intensity of radiation. b. duration of radiation. c. both of these d. none of these
A hypothesis is a(n)
A. proposed explanation developed before formal investigation. B. question developed that leads to an observation. C. strategy for solving a scientific problem. D. conclusion based on results of an investigation.
Which sort of change is combustion?
a. Chemical b. Physical c. Endothermic d. Hypergolic