优势菌种的驯化与纯菌液相油烟降解速率

用油烟气冷凝液为碳源,驯化来自城市污水处理厂氧化沟的活性污泥,结果表明真菌增长较快并显示出优势,微生物通过分工协作降解油烟污染物.一株优势红冬胞酵母菌被分离出来进行降解液相油烟污染物的动力学试验研究,实验结果表明:在优化条件37℃、pH值范围为6.0~7.0、无机盐浓度为1.0 m g/L、磷酸氢铵浓度为5.0 m g/L、溶解氧浓度为5.4 m g/L(搅拌速度120~160 r/m in)下,优势红冬胞酵母菌降解液态油脂的动力学模型是:u=0.13s352 s(-h 1);在低油烟浓度(352 m g/L)条件下,降解反应为一级生化反应;在高油烟浓度(352 m g/L)条件下,降解反应为零级生化反应;当油烟浓度等于352 m g/L时,比降解速率是最大比降解速率K值的一半,油烟浓度处于352 m g/L附近时,是从一级降解反应到零级降解反应的过度区.

The dominant strains domestication and velocity for pure strains degrading aqueous cooking fume

Active sludge from the oxidation ditch of the municipal sewage treatment plant had been domesticated for 21 days with condensate of cooking fume gas as carbon source. The result indicated that the fungi grew quickly and showed dominance in the progress of the domestication,and pollutants from cooking fumes can be degraded by this dominant microorganism with cooperation and independence. A dominant yeast strain-Rhodosporidium toruloides was isolated by pure culture,experiments of biodegrading aqueous cooking fume were done to research kinetics. The experimental result showed that in the condition that pH value ranges from 6. 0 to 7. 0, under optimizing terms 37C, the concentration of mineral salts is 1. 0 mg/L,ammonium hydrogen phosphate is 5.0 mg/L,and dissolved oxygen is 5.4 mg/L (stirring rate is 120～160 r/min ), the kinetic model of dominant yeast strain biodegrading aqueous cooking fume is u =0.13s/352+s (h-1);When concentration of cooking fume is low (< 352 mg/L), degrading reaction belongs to one order biochemical reaction; when concentration of cooking fume is high (>352 mg/L),degrading reaction belongs to zero order biochemical reaction ,with a biodegrading rate maximum value-0. 13 kg (oil)/h. kg (biobial)];when concentration of cooking fume equals to 352 mg/L;specific biodegrading rate is equal to one half of the peak specific biodegrading rate (the value of K),and belongs to the transition region from first order to zero order reaction.