Treatment of Biogas Slurry Produced by Fermentation of Food Waste Through Coagulation Sedimentation-Air Flotation-Intermittent Aeration MBR Process
In order to treat the biogas slurry produced by anaerobic fermentation of food waste,the process of coagulation sedimentation,air floatation and intermittent aeration MBR was used in the research.The results showed that after pretreatment including coagulation sedimentation and air flotation,85.3％,98.7％,99.4％and 99.4％of COD,TP,SS and animal and vegetable oil were removed,respectively.Ammonia nitrogen and total nitrogen yielded the lowest removal rate,which was 49.96％and 52.63％,respectively.The removal rates of COD,ammonia nitrogen and total nitrogen by intermittent aeration MBR at different C/N ratios were further investigated.Considering the technical and economic rationality of the process,optimal operating conditions were obtained at C/N ratio of 3.In this case,the removal rates of COD,ammonia nitrogen and TN were 87.63％,98.40％and 96.67％,respectively.After the combined process of coagulation sedimentation,air floatation and intermittent aeration MBR,the quality of the effluent meets the Level-3 standard in the Integrated Wastewater Discharge Standard(GB8978-1996).
Intermittent aerationMBRdenitrificationlow C/N ratio
万方数据
维普
