Hello Mr Aruchamy, I would ...

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Hello Mr Aruchamy, I would suggest your request additional analyses from your water laboratory.  I particular COD, ammonia, nitrates, phosphates. suspended solids, e.coli.  There is no doubt that you need to pre-treat the effluent before considering its us for edible crops.  You can consider a number of options for passive treatment (i.e. no or minimal mechanical equipment nor chemicals) including the already mentioned reed beds.  It is usually very beneficial to carry out anaerobic digestion as a first stage (for example in a septic tank or deep pond).  Your secondary treatment could include reed beds, facultative ponds, fixed media filtration, vermifiltration.  You may also consider maturation ponds as a final stage to minimise suspended solids and promote solar induced disinfection.  Your choice of plants for any reed bed system could be such that you provide materials for basket weaving or cattle fodder, but should not be plants for human consumption.  

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Dear Mr. Pearson. Depending on the area available for the channels, anaerobic digestion could be required or avoided. Floating helophytes due to its own features eliminate suspended solids.

I agree with your suggestion for solar induced disinfection, but just if required, depending on the irrigation system which is going to be used.

It is also essential to know which kind of toxic elements are present in the wáter to be treated. Most of the common elements which appear in domestic water can be fixed in plant rhizomes, depending on the species used in the channels, not passing to aerial part of plant, but the plant metabolism of many contaminats of emerging concern has not been studied yet. 

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