... hydrophile, high biological activity and so on. 2.large surface area,improves the enzymatic catalysis 3,high biological Operation : Mbbr Packings ... of unites per m3666,3401038,0001038,700341,000135,300Specific surface area(m2/m3)>693>845>834>591>427ColorNatural WhiteMaterialVirgin polytheneMBBR Packing ...