Removal of COD, BOD without chemical treatment : Is ultrafiltration an option?

Is it possible to remove COD, BOD without any chemical treatment? This also precludes the use of RO or similar systems. Since the water is planned to be bottled without reduction in any other characteristic. Is ultrafiltration an option? If so what should be kept in mind while choosing the same?

Any other methods or alternative techniques may also be suggested.

Francis,
croisader@gmail.com

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