| We adopt a foaming method to prepare polyvinyl formal containing different amonunts of bamboo charcoal,using polyvinyl formal foam as a base,and bamboo charcoal as the adsorption packing material.Besides have the small density and high specific strength excellent characteristics of polyvinyl formal,this composite materials also have strong adsorption property,which can be effectively used in sewage disposal system microbial carriers.In this paper we study the factors of dosage of HCl,formaldehyde,bamboo cha... |