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This may sound off the wall, but it is not.

If you are reasonably close to the ocean, and the rusty beds are thoroughly decontaminated, throw them in the ocean in a place where an artificial reed could be of value to local fisheries or fishermen (or even tourists...)

Not in the river, please!

https://www.scubanetworkblog.com/the-secrets-revealed-artificial-reef-vs-natural-reef-what-do-they-really-mean/