游离亚硝酸预处理强化剩余污泥发酵同步反硝化性能

考察了游离亚硝酸(FNA)预处理对污泥解体和剩余污泥发酵同步反硝化性能的影响.结果表明,不同FNA浓度(0,0.68,1.35和2.03mgN/L)处理剩余污泥预处理过程中,SCOD的产量和产生速率均随着FNA浓度的增加而增加,其中SCOD的产生速率依次为0.66, 1.70, 2.13和2.70mg/(gVSS×h).随着预处理过程中FNA浓度的增加,剩余污泥中死菌占总菌的比例由41%上升至80%.FNA预处理可使剩余污泥发酵同步反硝化系统SCOD的产量增加49%和污泥减量提高41%,同时使系统反硝化能力提高40%. 此外, FNA预处理可使该系统中温室气体N2O产量占NO2-还原量的百分比减少58%.

Free nitrous acid pretreatment enhances performance of waste activated sludge anoxic fermentation and denitrification system

This study investigated the impact of FNA-based pretreatment on sludge disintegration and waste activated sludge anoxic fermentation and denitrification process.The results showed that the amount and rates of soluble chemical oxygen demand (SCOD) production increased with the increasing FNA concentrations (0,0.68, 1.35 and 2.03 mgN/L) during FNA-based pretreatment process, of which SCOD production rate were 0.66, 1.70, 2.13 and 2.70mg/(VSS×h), respectively. Furthermore, the percentages of biocidal cells accounting for the total cells of waste activated sludge increased from 41% to 80 % . For the waste activated sludge anoxic fermentation and denitrification system, FNA-based pretreatment could not only made the SCOD production and sludge reduction performance increase by 49% and 41%, respectively, but also an increase of denitrifying capacity of this system by 40% was achieved. In addition, FNA-based pretreatment successfully reduce the percentage of N2O accounting for the reduced NO2- by 58%.