Constructed Wetlands for Wastewater Treatment: A Proposed Research Program

Large numbers of constructed wetlands for wastewater treatment (CWWT) are being built throughout the US using the "black box" approach of measuring influent and effluent, but not really understanding just what is happening inside the black box—the wetland. Since CWWTs have an important role to play in certain types of wastewater treatment (WWT), it is important to gain a better understanding of the biological, chemical and physical activity that is occurring within the wetland. With this knowledge, the advantages and the limitations can be much better defined and understood. To gain this knowledge, much additional research needs to be performed. This paper proposes that an organized effort be launched to develop a coordinated program for systematically planning, conducting and reporting the necessary research to gain the understanding that is needed. It also proposes that all of the stakeholders be involved in this coordinated effort. Finally, it proposes that the ASCE take the initiative to organize and help see this effort through to completion.