Thank you very much for your interest. At present, my plan is to write the book alone. It is a project for my retirement. However, due to other activities, I am proceeding awfully slowly. I am about to accomplish the second chapter about energy consumption of water and wastewater treatment processes maybe by the end of the first quarter of next year. The first chapter I have accomplished is about water scarcity and wastewater problems leading to water pollution. I have planned another two basic chapters: one about problems originating from greenhouse gases clarifying the need of renewable energy and the fourth one about basics of solar energy. Then the actual part of the book is planned which will be about the particular solar processes divided in thermal and photochemical ones. A final part will be about photovoltaics application in pumping and water and wastewater treatment.
Maybe, I realize that this task is a bit too large for me. In case I come to that decision, I should like to invite collaborators.