Response of Nitrogen Removal Performance and Microbial Distribution to Seasonal Shock Nutrients Load in a Lakeshore Multicell Constructed Wetland

Multicell constructed wetlands (MCWs) on lakeshores are a prospective treatment technique. However, the factors affecting nutrient removal performance of lakeshore MCWs at field scale unclear. This study chose field-scale MCW with highest mass efficiency (approximately 49,175.12 mg m−2 day−1) for total nitrogen in wet season to investigate response and microbial distribution seasonal shock nutrients load. The loading rates were as high 43~72 times over those dry season. Hence, storage pond (SP), forebay retention cell, was necessary mitigate loads influent, which is beneficial system. two major genera sediments heterotrophic nitrification–aerobic denitrification bacteria, abundance species nitrogen-related functional higher than According results redundancy analysis, hydraulic residence time (29.4%, F = 2.2, p < 0.1) rate (85.9, 36.5, 0.05) explaining community variation, instead environmental (temperature, pH, dissolved oxygen). influent periodic saturation contributed complicated oxygen exchange environment resulting microbes, MCWs. provided scientific basis optimal design lakeshores.