2016/2/1/ · Several researchers have reported that the addition of mineral additives into compost mixtures could accelerate the composting time and improve compost quality and the immobilization of toxic metals. Widely studied additives include coal fly ash (Fang et al., 1999, Wong et al., 2009, An et al., 2012), wood ash (Fernández-Delgado Juárez et al., 2015), lime