How can recycling water improve the environment? (site 1)

Water recycling has its significant part in helping the environment in following ways :

1)The water from industries and factories that goes into our river and water bodies directly. They have chemical pollutants that can be hazardous to environment. By treating the water during recycling, that can be prevented.

2)The water after recycling can be used in irrigation because it usually has high level of nitrogen

3)wetlands can not survive if the water is taken from them so, recycling helps them to maintain the ecosystem!

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."