I might suggest setting up ...

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I might suggest setting up some bench-scale tests .. might help with the answers to some of your questions .. when working with a synthetic resin adsorbent back in the 1970's, Ambersorb XE-340 manufactured by Rohm & Haas, we regenerated the resin with steam after it reached saturation .. it was very effective for the compouds we were studying . . volatile organic compounds (VOC's) .. 1,2-Dichloroethylene, Trichloroethylene, Tetrachloroethylene, & 1,1,2-Trichloroethane .. steam regeneration restored the resin to almsot 90% virgin capacity .. I don't know the similiarities/ /differences of the  bone char material to the Ambersorb XE-340 .. may / / may not be compatible with steam regeneration . .. but steam regenaation is a common practice in the industry .. you may also want to consult with the supplier / / manufacturer of the bone char filters .. they may already have proven methodologies for cleaning .. Thanks . Bob H