Antibiotic mycelial dregs

existing as biomass supra-colloids

are not only a kind of serious hazardous pollutants but also a kind of biomass resource.Their treatment and utilization

however

are greatly hindered because of their high water content and poor mechanical dewatering property.The results shows that hydrothermal treatment of the dregs remarkably improved their sedimentation

dewatering and drying properties.The solid content and heating value of solid bio-fuel obtained greatly increase with going up temperatures and extending hydrothermal treatment

but it was found that tar and even carbonization of the material took place at too high temperatures.The optimized conditions gained are at 200℃ for 30—60 min

and solid bio-fuels produced had solid contents of 52%—55%(mass) and heat values of about 14 MJ·kg-1.The solid recovery ratios fell in 65%—75%

and over 45% nitrogen in raw antibiotic mycelial dreg was removed via converting a part of non-Kjeldahl organic nitrogen(NKON)into Kjeldahl organic nitrogen(KON).As the form of ammonia nitrogen(NH4+-N)

most of removed nitrogen was dissolved in liquid product after hydrothermal treatment.The CODs of the liquid products were above 200000 mg·L-1

which can be good feedstock for bio-gas production.These results demonstrate actually that hydrothermal treatment would be an effective way to safely dispose and pretreat process residues from bio-pharmaceuticals industries like antibiotic mycelial dregs.