Dear SuSanA Community,
I hope this message finds you well. I am posting on behalf of Corinna Schröder, a researcher at the Network for Sustainable Sanitation Systems (NetSan) e.V., who is seeking support and input for her important research project: MARA – “Meta-analysis of scientific data on the composition & effects of recycled fertilizers from human excreta.”

About Corinna:
Corinna has a background in environmental engineering and circular economy. Since 2019, she has been working on projects related to Resource-Oriented Sanitation Systems (ROSS).

Project overview:
The MARA project aims to conduct a comprehensive meta-analysis on the quality and fertilizer value of products derived from ROSS/NASS (resource-oriented sanitation systems). This study will provide a condensed overview of the global scientific data from the past 15 years (2009-2024), focusing on:

• Fertilizer production processes and control parameters
• Fertilizer properties (nutrient concentrations, hygienic parameters, contaminant concentrations, including pharmaceutical and personal care product values)
• Agronomic effects (fertilizing effects, nutrient use efficiencies, soil- and ecotoxicological effects)

The results will be presented through various target-group-oriented publications to serve different stakeholders, including policymakers, practitioners, and scientists. This work is crucial for informing legislative processes and supporting the potential inclusion of urine and feces-based fertilizers in fertilizer ordinances, especially within the EU.

How you can help:
Corinna is seeking contributions in the form of:

• Publications
• Unpublished data sets or grey literature
• Contacts with working groups or projects that could provide relevant data

Your input will be invaluable in enriching the meta-analysis and ensuring comprehensive coverage of the topic.

Contact Information:
If you can provide any data or know of potential sources, please contact Corinna directly at  This email address is being protected from spambots. You need JavaScript enabled to view it. .
You can also send the attached document to those who can provide relevant info/data.


For more details about the project, you can visit the  MARA project page .

Thank you and kind regards,
Daniel Ddiba