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Ammonia nitrogen is present in a given wastewater sample as the ammonium ion (NH4+) and ammonia (NH3). If pH is the only deciding factor for the proportion of these two constituents, which of the following is a correct statement?

Ammonia nitrogen is present in a given wastewater sample as the ammonium ion (NH4+) and ammonia (NH3). If pH is the only deciding factor for the proportion of these two constituents, which of the following is a correct statement? Correct Answer At pH 7.0, NH<span style="position: relative; line-height: 0; vertical-align: baseline; bottom: -0.25em;font-size:10.5px;">4</span><span style="position: relative; line-height: 0; vertical-align: baseline; top: -0.5em;font-size:10.5px;">+ </span>will be predominant.

Concept:

Nitrogen Contents in sewage: The presence of nitrogen in sewage indicates the presence of organic matter, and may occur in one or more of the following forms: Free ammonia (also called Ammonia nitrogen), Albuminoid nitrogen (also called Organic nitrogen), Nitrites and Nitrates.

 Free ammonia (or Ammonia nitrogen):

  • Ammoniacal nitrogen (NH3-N), is a measure for the amount of ammonia present in sewage.
  • Ammonia has chemical formula of NH3 in the unionized state and NH4+ in the ionized state. The ammonia nitrogen is the sum of nitrogen present in both NH3 and NH4+.
  • The free ammonia indicates the very first stage of decomposition of organic matter and the amount will progressively decrease as sewage gets treated.

Ammonia exist in the form of NH4+ & NH3

  1. · At pH < 8, all ammonia is in the form of NH4+
  2. · At pH = 9.5, there are 50% NH3 & 50% NH4+
  3. · At pH > 11, all ammonia is in the form of NH3

​∴ Option 1 is correct.

Extra Points 

 Albuminoid nitrogen (or Organic nitrogen): 

  • Organic nitrogen is that nitrogen which describes nitrogen compounds that had its origin in living material.
  • The nitrogen in protein and urea is organic nitrogen. Organic nitrogen can enter sewage as bodily wastes, discarded food material, or as components of cleaning agents.
  • This albuminoid nitrogen indicates quantity of nitrogen present in sewage before the decomposition of organic matter is started.
  • If this organic nitrogen reacts anaerobically then it decomposes to ammonia and if this reacts aerobically it converts to nitrites or nitrates.

Related Questions

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