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Critical Research Gaps for Understanding Environmental Impacts of Discharging Treated Municipal Wastewater into Assimilation Wetlands

  • Applied Wetland Science
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Abstract

Assimilation wetlands are natural, non-constructed, wetlands that are used for the removal of nutrients from treated municipal wastewater. This passive process is comparatively less expensive than other conventional forms of tertiary treatment of wastewater, making it desirable for municipalities. Assimilation wetlands are monitored for a number of environmental parameters, yet limited research has been conducted to understand the ecological impact of this water treatment process. Studies from a variety of systems throughout the United States provide conflicting evidence of the responses of wetland ecosystems to increased inundation and nutrient enrichment. Through an extensive review of existing literature, we summarize the impacts of increasing nutrient loading and inundation on receiving wetlands. Importantly, we address current research gaps and identify directions for future scientific study on this topic. Comprehensive ecosystem monitoring conducted at larger spatial and temporal scales, as well as controlled experimentation, are needed to fully understand ecosystem responses to long-term use of wetlands to remediate wastewater nutrients. Our intent is neither to promote nor detract from this process, but rather to bring attention to potential drivers of environmental change and inform those who manage these systems.

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Acknowledgments

The authors extend gratitude to E. Yando and the anonymous reviewers for their edits and suggestions to enhance this manuscript.

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All authors contributed to the conception, review of literature, and execution of this review manuscript. TMS composed the first draft and BJR, SRF, and JAN authors provided section content and collected data for tables. BJR and JAN provided review of final draft; editing and revision was provided by TMS.

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Correspondence to Taylor M. Sloey.

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This research group is currently involved monitoring and research of an assimilation wetland.

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Sloey, T.M., Roberts, B.J., Flaska, S.R. et al. Critical Research Gaps for Understanding Environmental Impacts of Discharging Treated Municipal Wastewater into Assimilation Wetlands. Wetlands 41, 15 (2021). https://doi.org/10.1007/s13157-021-01396-8

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  • DOI: https://doi.org/10.1007/s13157-021-01396-8

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