?What is the difference between primary and secondary sewage treatment in wastewater treatment plants?
Fill in the blank(s) with the appropriate word(s).
Primary sewage treatment is a physical process that uses screens and a grit tank to remove large floating objects and to allow solids such as sand and rock to settle out. Secondary sewage treatment is a biological process in which oxygen is added to the sewage in an aeration tank to encourage aerobic bacteria to decompose as much as 90% of dissolved and biodegradable, oxygen-demanding organic wastes.
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What is the polar jet stream and where is it found? Does the position of the polar jet stream change during the year?
What will be an ideal response?
When the distance between two stars decreases by half, the force between them
A) decreases by one-quarter. B) decreases by one-half. C) increases to twice as much. D) increases to four times as much. E) stays the same.
Devonian barrier-reef complexes were associated with evaporite deposition in the back reef platform
a. True b. False
The ECMWF
A) is run by Canada. B) is probably the best weather prediction model. C) is not a spectral model. D) does not provide global forecasts. E) none of the above