**Preface to "Advances in Remediation of Contaminated Sites: Volume I"**

With the development of social economy, the population has increased sharply, and the land area involved in people's production and life is also gradually increasing. To meet the production and development needs of the society, land resources have been damaged and polluted synchronously to certain extents due to human activity. Most site contaminations result from past and present anthropogenic activities. As land resources are non-renewable, developing land restoration and improvement approaches with efficiency is an important approach for achieving sustainable development of human society.

Remediation of contaminated sites has been one of the most rapidly developing environmental research subjects. The process of remediation of contaminated sites is a site-specific phased approach comprising site characterization, risk assessment, and remediation technology selection and application. Site remediation technology has developed rapidly in recent years and has brought hope for environmental remediation. However, after this rapid development, site remediation technology has also encountered bottlenecks, and new breakthroughs are urgently required.

This reprint of "Advances in Remediation of Contaminated Sites" aims to collect the latest progress in remediation of contaminated sites, in order to help solving the new bottleneck in the development of site remediation technology. The reprint topics of interest include, but are not limited to, the following: 1) survey and assessment of contaminated sites, 2) environmental processes and effects of pollutants, 3) remediation technology and its application in contaminated sites, and 4) remediation strategy and management in contaminated sites.

In this reprint, we integrate the research results within 20 publications covering contaminated sites remediation's full life cycle. They include pollution investigation, environmental fate, pollution control, and review. In addition, the reprint addresses all aspects of contaminated sites remediation, including heavy metal pollution, organic pollution and combined pollution. The reprint is detailed in data, comprehensive in content, and novel in perspective. It is believed that the publication of this reprint has important academic and application significance for the remediation of contaminated sites.

We thank all the contributors and the Editor-in-chief for their enthusiastic support of the Special Issue and the editorial staff of *Processes* for their effort. We are writing to express our deepest thanks for the financial supports of our research. The major results of this reprint are mainly supported by the National Natural Science Foundation of China (Nos. 42277380, 42207439, and 42077114) and the Natural Science Foundation of Hainan Province (422QN273).

This reprint can be a reference for the scientific researchers of environmental science and engineering, environmental geoscience, chemical engineering and technology, resource recycling science and engineering, engineering technology, and management personnel of environmental protection departments and energy conservation and environmental protection industries, as well as the teachers and students of related majors in colleges and universities.

Due to the limited knowledge of us, there are inevitable omissions and mistakes in the reprint. We are open to comments and corrections from experts and readers.
