sampling of wastewater造句

The methods involve exposing living aquatic organisms to samples of wastewater for a specific length of time.
TN concentration in the samples of wastewater stemming from washing ranged from 40 to 150 mg / l with an average over all samples of 110 mg / l.
A random sample of wastewater shows a BOD of 959 mg / L . Total wastewater is 5.8 million gal / day . 959 x 3.875 ( liters to gal ) = 3.72gm / gal x 5.8 mgd = 21, 576 kg / day.
It's difficult to find sampling of wastewater in a sentence. 用sampling of wastewater造句挺难的