亚硝酸盐投加方式对剩余污泥发酵性能的影响  

Effects of Nitrite Dosing Modes on Sludge Fermentation Performance

作　　者：彭永臻[1,2] 王晓玲 张亮[1,2] 李家麟 杨慎华[1,2] 张琼 孟庆贺 PENG Yongzhen;WANG Xiaoling;ZHANG Liang;LI Jialin;YANG Shenhua;ZHANG Qiong;MENG Qinghe(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Beijing 100124,China)

机构地区：[1]北京工业大学城镇污水深度处理与资源化利用技术国家工程实验室,北京100124 [2]北京市水质科学与水环境恢复工程重点实验室,北京100124

出　　处：《北京工业大学学报》2019年第11期1057-1062,共6页Journal of Beijing University of Technology

基　　金：北京市科技计划资助项目(Z181100005518006);国家自然科学基金面上资助项目(21777005)

摘　　要：为考察亚硝酸盐投加方式对剩余污泥发酵性能的影响,研究比较了一次、批次和连续3种投加方式下,亚硝酸盐强化剩余污泥发酵的效果.试验采用3个相同序批式活性污泥反应器(sequencing batch reactor,SBR)进行7d的剩余污泥发酵处理并投加亚硝酸盐进行强化,亚硝酸盐投加总量相同并分别采用一次、批次和连续投加的方式.一次投加模式下系统亚硝酸盐积累的峰值最高,剩余污泥总化学需氧量(total chemical oxygen demand,TCOD)降低幅度最大且溶解性化学需氧量(soluble chemical oxygen demand,SCOD)产生量最高,表明一次投加模式有利于促进污泥颗粒有机物转化为溶解性有机物.连续向污泥发酵系统投加亚硝酸盐时,系统亚硝酸盐无明显积累,但是污泥挥发性悬浮固体(volatile suspended solids,VSS)的下降最为显著.连续投加亚硝酸盐的方式有利于强化污泥有机质减量,而且污泥脱水性良好,有利于后续进一步减量.研究表明,当以强化污泥减量为目标时,宜采用连续投加亚硝酸盐的方式强化剩余污泥发酵.To investigate the effect of nitrite dosage on enhancing excess sludge fermentation,the performance of the nitrite addition on excess sludge fermentation and degradation was compared under different dosing strategies,including once,batch and continuous dosing. In this study,nitrite solutions of the same amount were added to three sequencing batch reactors( SBR) in three different modes to enhance sludge fermentation for 7 d. The experimental results show that under one-time addition mode,highest peak value of nitrite accumulation is observed. The reduction of total chemical oxygen demand( TCOD) and the accumulation of soluble chemical oxygen demand( SCOD) are most significant among these reactors,indicating that high concentration nitrite effectively promotes the conversion of sludge particulate organic matter into dissolved organic matter. For the strategy of continuously dosing,no nitrite accumulation is observed but the volatile suspended solids( VSS) of the sludge present a greater reduction rate. Moreover,dewatering ability is improved when the sludge was treated under continuous nitrite feeding,which is beneficial for a further sludge reduction. This study indicates that the mode of continuous addition of nitrite is favorable for enhancing activated sludge reduction.

关 键 词：污泥发酵 亚硝酸盐 投加方式 污泥减量 脱水性 

分 类 号：X703[环境科学与工程—环境工程]