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The overabundance of nitrogen in water caused a number of adverse health and ecological effects. Two pilot subsurface wastewater infiltration systems (SWISs) were constructed in the laboratory filled with the same mixed matrix, one of them without shunt distributing pipe (non-shunt system) and the other one with shunt ratio of 1:1 and shunt position at the depth of 0.7m (shunt system). Pollutant removal...