1. (2023, August 01). Available online: https://sdgs.un.org/goals/goal6.
2. Deng, S., Wang, C., Hao Ngo, H., Guo, W., You, N., Tang, H., Yu, H., Tang, L., and Han, J. (2023). Comparative review on microbial electrochemical technologies for resource recovery from wastewater towards circular economy and carbon neutrality. Bioresour. Technol., 376.
3. (2021). Progress on Household Drinking Water, Sanitation and Hygiene 2000–2020: Five Years into the SDGs, World Health Organization (WHO)/United Nations Children’s Fund (UNICEF) Joint Monitoring Programme for Water Supply, Sanitation and Hygiene (JMP).
4. European Commission (2000). Directive 2000/60/EC of the European Parliament and of the Council Establishing a Framework for the Community Action in the Field of Water Policy, European Commission. Available online: https://eur-lex.europa.eu/legal-content/en/ALL/?uri=CELEX%3A32000L0060.
5. European Commission (2023, August 01). COUNCIL DIRECTIVE of 21 May 1991 Concerning Urban Waste Water Treatment. Available online: https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:31991L0271&from=EN.