Dear Farhat,

I believe that illuminated algal bioreactors may be worth investigating as the algae can utilise the nitrate very efficiently as a nutrient.

A similar problem was once found in London Thames water where agriculture in the Thames valley and treatments works outfalls resulted in high nitrate nitrite levels which were only brought into a legal range by dilution with fresh spring water.

The levels were so high that Blue Baby syndrome (not the Smurfs!) was a real health concern. This was in the 1980's and I believe that the problem may have been overcome by now.

Hope this helps,

Kind regards,

Dr John

Dear Farhat,

I have just thought, if finances are available, ion exchange might be worth considering as well.

Kind regards,

Dr John

Dr.John

Thanks for suggtstion.This is a problem sorted in water supplied to houses.How by allowing algae to grow and consume the nitrates and nitrite the problem could be solved

Regards

Farhat

Dear Farhat,

By passing the water through glass reactors containing algae illuminated by visible light, the algae will very effectively scavenge the nitrate and nitrite using them as a source of nitrogen to grow.

Try: www.who.int/water_sanitation_health/dwq/chemicals/en/nitratesfull.pdf.

This is a WHO paper and looks good!

Hope this is helpful,

With kind regards,

Dr John