关键词: 水热处理, 脱水, 发酵过程残渣, 抗生素菌渣, 生物燃料

Abstract: 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.

Key words: hydrothermal treatment, dewatering, fermentative process residue, antibiotic mycelial dreg, bio-fuel