Dear Soloman The short ...
Published by Gary Brown, Water Practitioner at Dikubu Water
Dear Soloman
The short answer is yes it is likely and I can reference some for you but you need to understand the risks associated with, for example, of replacing a conventional building material with a recovered water treatment sludge.
Toxicity comes to mind if exposed to humans or the environment, usually in the form of heavy metals that can accumulated in the sludge.
Regulation, is the sludge an allowed product to be applied in the re-use application or not?
Integrity of the material, when applied does it pass strength and construction tests where it has been re-used?
i have some very useful references if you are interested, contact me directly
Regards
Gary