Secondary effluent on Mound

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    The SoP allows for a reduction of the sand layer to 3″ from 12″ if secondary treated effluent is applied to a mound.

    If we have a restrictive layer that requires at least 12″ of sand to get the required separation, does it make sense to allow an increased loading of the sand layer due to the fact that the effluent being applied to the sand is of a higher quality? (from a treatment plant)


    The purpose of the sand layer is to allow for enough vertical separation between the effluent entering the soil interface and a restricting layer.  The goal is to achieve seven days retention time in the soil to allow the micro-organisms in the soil to ‘clean’ the effluent, or strip it of bacteria and pathogens.  If the effluent is cleaner when it enters the soil interface, it will not require as much retention time in the soil to provide that ‘cleaning’.

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