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Filtration of wastewater flowing over a surface of land with vegetation and
water is a biodegradable treatment.
Biodegradable substances are those which can be recycled for other uses
such as manure etc. The filtration of the waste water helps to remove
organic materials and pathogens present in it. The organic materials
removed can then be used for other purposes.
The pathogens are then destroyed to prevent the spread of diseases within
the area. The explanation makes biodegradable treatment most appropriate.
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