Describe the rationale for why Nitrogen and Phosphorus are problematic in Lakes that are Eutrophic in nature. What mechanisms exist for removing P from a natural water body? What mechanism removes N from water bodies? What are the general limits followed for preventing algal blooms? Solution 1. Phosphorus and nitrogen are the main nutrients encouraging the growth of organic matter and algae which cause eutrophication in water bodies. Eutrophication causes deficiency of the oxygen in water which causes the danger to the aquatic life. a) Phosphorus Removal :- The dominating process for the removal of phosphorus is chemical precipitation. Typically it is done with aluminum and iron coagulants before the biological treatment but phosphorus can also be precipitated in the biological treatment or as the final step of the treatment process. b) Nitrogen Removal :- Nitrogen in wastewater mainly takes the form of ammonia, an ion that is difficult to precipitate. Nitrogen is therefore normally removed in a biological process consisting of two steps – nitrification and denitrification. By using our coagulants and flocculants before the biological treatment, the nitrification capacity is increased within existing volumes. c) Limits Nitrogen :- 75mg/l Phosphorus :- 5 mg/l.

1. Describe the rationale for why Nitrogen and Phosphorus are problematic in Lakes that are
Eutrophic in nature. What mechanisms exist for removing P from a natural water body? What
mechanism removes N from water bodies? What are the general limits followed for preventing
algal blooms?
Solution
1. Phosphorus and nitrogen are the main nutrients encouraging the growth of organic matter and
algae which cause eutrophication in water bodies. Eutrophication causes deficiency of the
oxygen in water which causes the danger to the aquatic life.
a) Phosphorus Removal :- The dominating process for the removal of phosphorus is chemical
precipitation. Typically it is done with aluminum and iron coagulants before the biological
treatment but phosphorus can also be precipitated in the biological treatment or as the final step
of the treatment process.
b) Nitrogen Removal :- Nitrogen in wastewater mainly takes the form of ammonia, an ion that is
difficult to precipitate. Nitrogen is therefore normally removed in a biological process consisting
of two steps – nitrification and denitrification. By using our coagulants and flocculants before the
biological treatment, the nitrification capacity is increased within existing volumes.
c) Limits Nitrogen :- 75mg/l
Phosphorus :- 5 mg/l