Decoloration and mineralization of yeast wastewater were investigated by using Ce-Fe/Al2O3 as a heterogeneous photo-Fenton catalyst in fluidized bed reactor in order to solve the problem of yeast wastewater discharge....Decoloration and mineralization of yeast wastewater were investigated by using Ce-Fe/Al2O3 as a heterogeneous photo-Fenton catalyst in fluidized bed reactor in order to solve the problem of yeast wastewater discharge. The experimental results were assessed in terms of total organic carbon（TOC） reduction. The operational and reaction conditions affecting the efficiencies of TOC removal such as initial pH value, H2O2 concentration, catalyst loading and UV power were studied. The results show that TOC is reduced from 347.6 mg/L to 10.8 mg/L, color is changed from 500 units to 0 under the conditions as follows： initial pH value 6. 0, H2O2 concentration of 1. 000 g/L, catalyst loading of 5 g/L, reaction duration of 120 rain and reaction temperature of 30 ℃. The irradiated Ce-Fe/Al2O3 catalyst was complexed with 1,10-phenanthroline and then it was subjected to Fourier transform infrared spectroscopy and diffuse reflectance spectroscopy to confirm the formation of Fe（Ⅱ） in the solid state. Heterogeneous photo-Fenton reaction proves to be effective for the treatment of yeast wastewater.展开更多
Hansenula anomala were general pale yellow oval-shaped bacteria in aerobic biochemical wastewater process,but transformed into pale yellow round-shape under hypoxia condition.A better precipitation of lysine wastewate...Hansenula anomala were general pale yellow oval-shaped bacteria in aerobic biochemical wastewater process,but transformed into pale yellow round-shape under hypoxia condition.A better precipitation of lysine wastewater could be obtained by using Hansenula anomala in hypoxia biochemical treatment.Therefore,the lysine wastewater could be used to produce yeast protein feed at 23-33 ℃ water temperature and 2.8-4.4 p H by Hansenula anomala in hypoxia condition.The results indicated that removal rate of chemical oxygen demand（COD） was 65.8%,and that of suspended substance（SS） was 95.6%.Then the deposited yeast protein was dried after secondary sedimentation and steam sandwich concentrated method.Results showed that 3.9 t yeast protein feed could be obtained every day,and its price was 3 000 Yuan per ton,so that the annual profit of company would be 9.6 million Yuan after deducting the operating cost of wastewater treatment.展开更多
基金Project(20277010) supported by the National Natural Science Foundation of China
文摘Decoloration and mineralization of yeast wastewater were investigated by using Ce-Fe/Al2O3 as a heterogeneous photo-Fenton catalyst in fluidized bed reactor in order to solve the problem of yeast wastewater discharge. The experimental results were assessed in terms of total organic carbon（TOC） reduction. The operational and reaction conditions affecting the efficiencies of TOC removal such as initial pH value, H2O2 concentration, catalyst loading and UV power were studied. The results show that TOC is reduced from 347.6 mg/L to 10.8 mg/L, color is changed from 500 units to 0 under the conditions as follows： initial pH value 6. 0, H2O2 concentration of 1. 000 g/L, catalyst loading of 5 g/L, reaction duration of 120 rain and reaction temperature of 30 ℃. The irradiated Ce-Fe/Al2O3 catalyst was complexed with 1,10-phenanthroline and then it was subjected to Fourier transform infrared spectroscopy and diffuse reflectance spectroscopy to confirm the formation of Fe（Ⅱ） in the solid state. Heterogeneous photo-Fenton reaction proves to be effective for the treatment of yeast wastewater.
文摘Hansenula anomala were general pale yellow oval-shaped bacteria in aerobic biochemical wastewater process,but transformed into pale yellow round-shape under hypoxia condition.A better precipitation of lysine wastewater could be obtained by using Hansenula anomala in hypoxia biochemical treatment.Therefore,the lysine wastewater could be used to produce yeast protein feed at 23-33 ℃ water temperature and 2.8-4.4 p H by Hansenula anomala in hypoxia condition.The results indicated that removal rate of chemical oxygen demand（COD） was 65.8%,and that of suspended substance（SS） was 95.6%.Then the deposited yeast protein was dried after secondary sedimentation and steam sandwich concentrated method.Results showed that 3.9 t yeast protein feed could be obtained every day,and its price was 3 000 Yuan per ton,so that the annual profit of company would be 9.6 million Yuan after deducting the operating cost of wastewater treatment.
