Dear Evans, A trickling ...

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Dear Evans,

A trickling filter followed by flash aeration may do the trick. Though this may require some electrical energy and tanks to be constructed, the water post this treatment will definitely have acceptable levels of nitrates. Just need to initiate a nitrification denitrification cycle. Also, if the water requirement is 20 - 40000 liters, the RO units cost quite less. In India, we provide an RO of that capacity for approximately 5 - 6 lakh rupees. It comes to around $10000 USD. And its worthwhile if you want to use the water for drinking.