Dear Colleagues,

The water deficit present on all continents of the globe is and will be in the near future the main factor of the slowdown of economic development in all countries of the world. In addition, the water that is currently in the world is polluted to a large extent through the development of human civilization. The development of housing, industry, and agriculture in recent decades has contributed significantly to the use of huge amounts of water, and thus to the production of large amounts of wastewater, which, to a large extent, is left untreated in the environment. Therefore, every human activity aimed at stopping the water deficit process and/or reducing the water pollution process should be a priority for humanity, and above all for the scientific community. The main factor of pollution of such scarce water resources is wastewater, as a derivative of water consumption by humanity for domestic, industrial, agricultural purposes, etc. The development of wastewater treatment systems so that they do not endanger the natural environment must be methodical, preferably in a relationship between science, economy, and the environment in international cooperation. Only an international exchange of mutual experiences in the field of water and wastewater management will allow the improvement of methods and processes of wastewater treatment and thus prevent degradation of surface and groundwater in the world. Currently, developing countries have problems with wastewater treatment processes from various branches of the economy, which have already been diagnosed and eliminated in highly developed countries. The possibility of getting acquainted with such solutions through insight into scientific publications in the field of water and wastewater management will allow the implementation of these experiences in areas where these problems arise. Generally, every action of mankind to improve the quality of water will result in the improvement of the well-being of people and their future generations.

Supported by the 2^nd International Scientific Conference on Ecological and Environmental Engineering Conference (30 June–2 July 2021, https://coee.urk.edu.pl/).

Dr. Dariusz Młyński
Prof. Dr. Piotr Bugajski
Guest Editors

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• quality of water
• wastewater
• wastewater treatment plant
• pollutions