The fixing carrier for fixing an activated sludge 1, wherein: the grain size of {TAIL ~ said granulated blast furnace slag} is within the range of {HEAD ~ from 20 to 200 microns} 
The fixing carrier for fixing an activated sludge 1 , wherein : the grain size of { TAIL ~ said granulated blast furnace slag } is within the range of { HEAD ~ from 20 to 200 microns }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD