Aims The Journal of Water Process Engineering aims to be the premier international forum for the publication of world leading, high impact research on the sustainable engineering of water and wastewater treatment processes. Scope Water process engineering is interpreted by us as the understanding and application of the fundamental laws and principles of nature that allow us to transform raw or waste water sources into products that are useful to society, while operating at laboratory, pilot or full industrial scale. These products include clean water, energy and material resources. Our scope focuses on the design, operation, control, modelling, optimization and intensification of chemical, physical, and biological processes for water treatment. We emphasize the process engineering aspects of water treatment processes, for which the focus of the study is on the engineered application and practice rather than the fundamental and underlying science. Submission of outstanding research articles and state-of-the-art reviews are actively encouraged from academic and industrial researchers and technologists. We are particularly interested in the growth of submissions which emphasize the process engineering aspects of water sustainability, focusing on issues related to the reclamation, reuse and recycling of water, materials and energy from alternative sources, including fit-for-purpose treatment processes and technologies with reduced energy and chemical consumption, lower environmental/carbon footprint, and greater social benefit. We are also interested in those submissions which explore emerging areas of research focus; please look out for our 'calls for papers' to be published in special issues. If you are interested in submitting a critical and insightful review paper on the state-of-the-art in a relevant area, we encourage you to contact one of the Editors-in-Chief first to discuss your proposal.