**Zeng-Yei Hseu**

Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan; zyhseu@ntu.edu.tw; Tel.: +886-2-33664807

Received: 10 October 2020; Accepted: 13 October 2020; Published: 15 October 2020

**Abstract:** Soils, sediments, and water require careful stewardship for the planet's security to achieve the Sustainable Development Goals (SGDs) set from the United Nations. However, the contamination of these natural resources can damage ecological and human health, and thus we need a comprehensive approach to provide a remediation reference for the SDGs. The aim of this Special Issue (SI) was to gather the papers emphasizing different aspects and findings of the contamination processes, remediation techniques, and risk assessment of soils, sediments, and water. The Guest-Editor of this SI collected seven papers dealing with biochar application for the reduction in soil nutrient leaching by Kuo et al. and for the immobilization of soil cadmium by Chen et al. Their works contributed to not only sustain soil functions but also to prevent sediments and water from contamination. Moreover, in situ stabilization by environmentally compatible approach is a green remediation of sediments such as thin-layer capping for freshwater and estuary sediments by Ou et al. and Ch'ng et al., respectively. Bioassays including microbiological response and enzyme activities were used to test water quality by Martín et al. and Aljahdali et al., in addition to the finding of antibiotic-degrading bacterial strains reported by Yang et al. in sewage sludge. These papers may aid to update and incorporate new views and discussion for the SDGs.

**Keywords:** bioaccessibility; biochar; biomarkers; green and sustainable remediation; heavy metal; SDGs; thin-layer capping
