A first aspect of the present invention relates to a digested sludge
treatment apparatus for treating digested sludge generated by subjecting
organic waste matter to anaerobic digestion, comprising: an apparatus for
decarbonating the digested sludge; a removal apparatus for removing
coarse contaminant particles from the digested sludge; and an apparatus
for separating or concentrating crystals containing magnesium ammonium
phosphate from the digested sludge after the digested sludge passes
through the decarbonation apparatus and removal apparatus. Another aspect
of the present invention relates to a digested sludge treatment apparatus
for treating digested sludge generated by subjecting organic waste matter
to anaerobic digestion, comprising: a crystallization reactor for
precipitating magnesium ammonium phosphate from the digested sludge; a
removal apparatus for removing coarse contaminant particles from the
digested sludge; and an apparatus for separating or concentrating
crystals containing magnesium ammonium phosphate from the digested sludge
after the digested sludge passes through the crystallization reactor and
coarse contaminant particles removal apparatus.