Removal of nitrates and phosphates

The methods for removal of phosphate and nitrate involve the usage of polymer hydrogels and crystallization process using coal fly ash.

Explanation:

I looked this up, the question is very vague, so I can't be sure if this answers your question.

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

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