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Phosphorus (P) removal capacity of these wetlands may decline, however, as P is released from the accrued organic soils. Little research has been done on methods to restore the treatment capacity of aging constructed wetlands. One possibility is the seasonal addition of alum during periods of low productivity and nutrient removal. Our 3\u2010mo mesocosm study investigated the effectiveness of alum in immobilizing P during periods of reduced treatment efficiency, as well as the effects on soil biogeochemistry. Eighteen mesocosms were established, triplicate experimental and control units for <jats:italic>Typha<\/jats:italic> sp., <jats:italic>Schoenoplectus californicus<\/jats:italic>, and submerged aquatic vegetation (SAV) (<jats:italic>Najas guadalupensis<\/jats:italic> dominated). Alum was slowly dripped to the water column of the experimental units at a rate of 0.91 g Al m<jats:sup>\u22122<\/jats:sup> d<jats:sup>\u22121<\/jats:sup> and water quality parameters were monitored. Soil cores were collected at experiment initiation and completion and sectioned into 0\u2010 to 5\u2010 and 5\u2010 to 10\u2010cm intervals for characterization. The alum floc remained in the 0\u2010 to 5\u2010cm surface soil, however, soil pH and microbial parameters were impacted throughout the upper 10 cm with the lowest pH found in the <jats:italic>Typha<\/jats:italic> treatment. Plant type did not impact most biogeochemical parameters; however, data were more variable in the SAV mesocosms. Amorphous Al was greater in the surface soil of alum\u2010treated mesocosms, inversely correlated with soil pH and microbial biomass P in both soil layers. Microbial activity was also suppressed in the surface soil of alum\u2010treated mesocosms. This research suggests alum may significantly affect the biogeochemistry of treatment wetlands and needs further investigation.<\/jats:p>","DOI":"10.2134\/jeq2007.0159","type":"journal-article","created":{"date-parts":[[2007,10,26]],"date-time":"2007-10-26T19:56:58Z","timestamp":1193428618000},"page":"1904-1913","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Soil Biogeochemical Characteristics Influenced by Alum Application in a Municipal Wastewater Treatment Wetland"],"prefix":"10.1002","volume":"36","author":[{"given":"Lynette M.","family":"Malecki\u2010Brown","sequence":"first","affiliation":[{"name":"Wetland Biogeochemistry Lab., Soil and Water Science Dep. Univ. of Florida 106 Newell Hall, P.O. 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