The configuration of these systems is quite similar to those described in the previous post.
The difference is that to treat the wastewater flows vertically in the medium filling (percolation) and is placed in the tanks with alternating load intermittently, while in the SFS-h systems there is a plug flow with continuous feeding.
This methodology involves the use of intermittent flow a minimum of two tanks in parallel for each line alternate work flow, so you can adjust the timing of re-oxygenation of the bed varying frequency and quantity of the hydraulic load input, through the adoption of appropriately sized self-priming siphon devices.
surface flow systems instead, consist of tanks or canals where the water surface is exposed to the atmosphere and the soil, constantly submerged, is the support for the roots of plants emerging in these systems the flow is horizontal and the height of the tanks generally limited to a few tens of centimeters.
In these systems, the mechanisms of killing reproduce exactly all the factors involved in the power of self-purification of wetlands.
In the next post, unless there are specific questions, I begin to talk about the foundations of buildings green.
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