## 5 Conclusions and Future Perspectives  
In recent decades, due to the dramatic rise in water contaminants, plasma technology for the treatment of raw and industrial wastewater has drawn the attention of academics and technologists. This review lists various plasma discharge techniques (e.g., DBD, plasma jets, gliding arc discharge, and glow discharge, etc. ), and illustrates the impact of various plasma parameters (e.g., input gas, discharge power, discharge gap, cathode gap, etc.) on effluent purification effectiveness. A thorough description of the degradation of a range of typical organic pollutants by plasma is also included in this manuscript. These pollutants include pharmaceuticals (antibiotics, recalcitrant pharmaceuticals and pesticides), organic chemical reagents, azo dyes, common industrial pollutants, viruses and more. In comparison to other conventional approaches and AOPs, plasma has also demonstrated excellent efficiency in eliminating numerous aqueous contaminants, including SARS-CoV-2, a lethal and contagious virus in wastewater. These studies have demonstrated the potential of plasma-liquid interaction as a novel water management strategy for the removal of pollutants from drinking water. However, looking ahead, in order to advance plasma research and development for commercial use and industrial application, there are still numerous challenges to be overcome. (1) The performance of plasma-based water purification in small-scale experiments clearly illustrates the promise of this technology. Scaling up may still be the biggest challenge. (2) Given the diversity and uniqueness of plasma generators, the \"plasma dose,\" as the fundamental of plasma application, is still inconclusive. (3) Better understanding of the physical processes occurring at the interface, and how best to control them, is key to further improving reactor efficiency. (4) The existing literature has generally considered the degradation mechanisms and performance of APPs, while little research has been done on the energy yield of APPs. In order to bring APP as close to the field as possible, more comparative examinations will be needed, using APP energy yield as a key factor in implementation. (5) The fate of the intermediates created during the treatment process of plasma-driven water purification remains unknown. (6) Most of the current studies involve single-component treatment, and there is a lack of research on the treatment of complex organic molecules. The exclusion efficacies of the considered compounds may not be transferable to actual situations when applied to organic molecule mixtures, and re-active species interactions among pollutants may appear. Plasma technology faces issues more generally, but this is one that requires additional exploration. More detailed quantitative data and parameters from experimental studies are still required to advance this topic. Conceptualization, Z.J. ; formal analysis, Y.Z. ; resources, J.Z. and Y.Z. ; writing--original draft preparation, Y.Y. and D.C.; writing--review and editing, R.M. and H.X. ; visualization, D.C. and Y.Y. ; supervision, Z.J. and R.M. ; project administration, J.Z. ; funding acquisition, Z.J. All authors have read and agreed to the published version of the manuscript.