there is a review since 1994 ...
Published by Farida El-Dars, Professor of Environmental Analytical Chemsitry
there is a review since 1994 about the subject in water research journal
The use of peat in wastewater treatment
and a guidance document in jan2008
https://www.nj.gov/dep/dwq/pdf/NJ_Peat_Guidance_01_08.pdf
hope this helps