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# Nitrogen Content and Biochemical Oxygen Demand ( BOD )

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We have a wastewater source whose flow is 2000 m3 per day; the stated BOD or bio-chemical oxygen demand in that wastewater is given as 5000 mg/l.

We are to use urea (NH2)2CO to provide nitrogen to the wastewater in a specific ratio of 100 parts (BOD) to 5 parts(Nitrogen) --- no more or no less.

The mass fraction of N in urea is given as 46.6% by weight; the solubility of urea in water is given as 51.6 grams/100 grams; and the density of the urea is provided as 760 kg/m3.

Given all of the above....how do I calculate how much elemental Nitrogen I need for this wastewater given the 100(BOD) to 5(N) ratio?

https://brainmass.com/chemistry/chemical-kinetics/nitrogen-content-biochemical-oxygen-demand-bod-236802

#### Solution Preview

"Calculating quantity of nitrogen in urea --- for an environmental water system
Here is our homework problem:

We have a wastewater source whose flow is 2000 m3 per day; the stated BOD or bio-chemical oxygen demand in that wastewater is given as 5000 mg/l.

We are to use urea (NH2)2CO to provide nitrogen to the wastewater in a specific ratio of 100 parts(BOD) to 5 parts(Nitrogen) --- no more or no less.

The mass fraction of N in urea is given as 46.6% by weight; the solubility of urea in water is given as 51.6 grams/100 grams; and the density of the urea is provided as 760 kg/m3.

Given all of the above....how do I calculate how much elemental Nitrogen I need for this wastewater given the 100(BOD) to 5(N) ratio??? ...

#### Solution Summary

This solution demonstrates how to convert the rate of BOD flow in a water system to the amount of nitrogen needed to treat that system. In order to do this, a given ratio along with molar masses are used.

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