Answer:
28.57%
Explanation:
Given that:
= 10.0 mg/L
= 3.0 mg/L
We can calculate for the Original maximum deficit can be calculated which can be illustrated as follows:
![DO_{max} = DO_{sat}-DO_{min}](https://tex.z-dn.net/?f=DO_%7Bmax%7D%20%3D%20DO_%7Bsat%7D-DO_%7Bmin%7D)
where;
represents the maximum dissolved oxygen
represents the saturated dissolved oxygen
represents the minimum dissolved oxygen
= 10.0 mg/L - 3.0 mg/L
= 7.0 mg/L
We can also calculate the Desired maximum deficit by using the above expression:
![DO_{max} = DO_{sat}-DO_{min}](https://tex.z-dn.net/?f=DO_%7Bmax%7D%20%3D%20DO_%7Bsat%7D-DO_%7Bmin%7D)
In which ;
= 10.0 mg/L
= 5.0 mg/L
Now that we have all we need to replace the value; we have:
= 10.0 mg/L - 5.0 mg/L
= 5.0 mg/L
Finally, the percentage needed by the BOD for removing the waste can be determined using the following expression;
percentage =
%
where;
Desired
= 5.0 mg/L
Original
= 7.0 mg/L
Then we have;
percentage =
%
=71.43%
Required BOD = 100% - 71.43%
Required BOD = 28.57%
Hence, The percentage necessary for the BOD of the plant waste to be reduced to assure a healthy stream with at least 5.0 mg/L DO everywhere = 28.57%
PH meter, which is a device used to measure hydrogen-ion activity in the solution. A PH meter is a voltmeter stuck to a pH electrode and a reference electrode. -maclittleseed
A person who specializes in the study of animals is called a zoologist. Zoologists who study certain kinds of animals have their own names.
The answer is; TRUE
This is the ultimate definition of a food chain. An example is fish that are eaten by seals and the seals are preyed upon by sharks. Seals are the prey of sharks but the predator of fish. This is how energy is transferred in a food web from the primary producers (phototropic organisms) to tertiary consumers.