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This study covered a critically review as well as different key aspects of CW, such as various types of CW, the contaminants and their removal mechanisms study, degradation pathways, challenges and opportunities, materials, applications and theory with a focus on recent advances in last three decades. In addition, an attempt has taken to project future advances in the field of CW and facilitate these advances by framing key unsolved problems in CW. Guidelines are prepared for the fast-growing CW field through the standardization of key design aspects. This study has also covered the evaluation of the current state-of-the-art of CW technology and provides definitions and performance metric nomenclature in an effort to unify the fast-growing CW community. The investigation also contains an outlook on the emerging trends in CW and proposes future research and development directions. Moreover, the challenges facing constructed wetland include methane production. Methane is considered as one of the important contributors (greenhouse gases) to the ozone destruction. There are specific types of plants that when used in constructed wetland they produce high CH4. Potential for development and challenges in biogas (e.g. CH4) as an energy resource is one of the alternative options to reduce greenhouse gas emission from the constructed wetland. Wetland biomass as a cooking fuel can offset some of the demand for unsustainable and unhealthy solid fuels (such as charcoals). The potential to employ proven small-scale biogas technologies in CW can be utilized as an energy source in the community. Moreover, bioenergy production from CW can reduce reliance on fossil fuels and has the potential to offset energy and irrigation needs in different regions. From the current state, it is obvious that the technology has the potential to provide a sustainable wastewater management as well as bioenergy source without creating any burden on water resources.