▁and ▁a ▁corresponding ▁decrease ▁in ▁react ivity . ▁ ▁Sol utions : ▁Several ▁options ▁to ▁reduce ▁sor b ent ▁de activ ation ▁are ▁currently ▁being ▁research ed . ▁An ▁ideal ▁sor b ent ▁would ▁be ▁mechan ically ▁strong , ▁maintain ▁its ▁re active ▁surface ▁through ▁repeated ▁cycles , ▁and ▁be ▁reason ably ▁in exp ensive . ▁Using ▁therm ally ▁pre - activ ated ▁particles ▁or ▁react iv ating ▁spent ▁sor b ents ▁through ▁hyd r ation ▁are ▁two ▁prom ising ▁options . ▁ ▁Th erm ally ▁pre - activ ated ▁particles ▁have ▁been ▁found ▁to ▁retain ▁activity ▁for ▁up ▁to ▁a ▁thousand ▁cycles . ▁Similarly , ▁particles ▁react iv ated ▁by ▁hyd r ation ▁show ▁improved ▁long ▁term ▁( after ~ 2 0 ▁cycles ) ▁convers ions . ▁ ▁Dis pos al ▁of ▁waste ▁sor b ent ▁ ▁Properties ▁of ▁waste ▁sor b ent ▁ ▁After ▁cy cling ▁several ▁times ▁and ▁being ▁removed ▁from ▁the ▁calci um ▁loop , ▁the ▁waste ▁sor b ent ▁will ▁have ▁attr ited , ▁sul f ated ▁and ▁become ▁mixed ▁with ▁the ▁ash ▁from ▁any ▁fuel ▁used . ▁The ▁amount ▁of ▁ash ▁in ▁the ▁waste ▁sor b ent ▁will ▁depend ▁on ▁the ▁fraction ▁of ▁the ▁sor b ent ▁being ▁removed ▁and ▁the ▁ash ▁and ▁cal or ific ▁content ▁of ▁the ▁fuel . ▁The ▁size ▁fraction ▁of ▁the ▁sor b ent ▁is ▁dependent ▁on ▁the ▁original ▁size ▁fraction ▁but ▁also ▁the ▁number ▁of ▁cycles ▁used ▁and ▁the ▁type ▁of ▁lim estone ▁used . ▁ ▁Dis pos al ▁routes ▁