餐厨垃圾消化废水处理过程中氮的迁移转化规律  

Nitrogen Migration and Transformation in Process of Restaurant Waste Digestion Wastewater Treatment

作　　者：尹疆[1] 蒋剑虹[2,3] 唐清畅 彭馨[1] YIN Jiang;JIANG Jian-hong;TANG Qing-chang;PENG Xin(College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China;China Machinery International Engineering Design&Reaserch Institute Co.Ltd.,Changsha 410007,China;Hunan Engineering Research Center for Water Treatment Process&Equipment,Changsha 410007,China)

机构地区：[1]湖南师范大学化学化工学院,湖南长沙410081 [2]中机国际工程设计研究院有限责任公司,湖南长沙410007 [3]湖南省水处理过程与装备工程技术研究中心,湖南长沙410007

出　　处：《中国给水排水》2022年第15期98-103,共6页China Water & Wastewater

基　　金：湖南省自然科学基金资助面上项目(2021JJ30450);湖南省高新技术产业科技创新引领计划项目(2020SK2042、2022GK4062);湖南省重点研发计划项目(2022SK2067)。

摘　　要：采用厌氧/好氧(A/O)—Fenton—曝气生物滤池(BAF)组合工艺处理高浓度餐厨垃圾消化废水,分析了各个工艺段中TN、NH_(4)^(+)-N、NO_(3)^(-)-N和溶解性有机氮(DON)的降解转化过程,并研究了工艺沿程DON的分子质量、氨基酸及荧光光谱变化规律。结果表明,微生物会同时利用无机氮和有机氮进行新陈代谢,在A/O单元碳源充足的情况下利用碳源将无机氮转化成自身所需的营养物质,降低水中的无机氮浓度;在BAF单元碳源不足的情况下,微生物对无机氮的转化率降低,但不影响对有机氮的转化,有机氮的转化与微生物浓度有关,而与溶解氧(DO)和碳源关系不大。荧光光谱及分子质量分析表明,经Fenton处理后,大分子的含氮有机物会转化成小分子物质,从而在后续BAF单元中得以去除。组合工艺出水中的NO_(3)^(-)-N和DON分别占出水TN的92.5%和6%。微生物代谢产物会增加大分子有机物在出水DON中的占比。废水中的氨基酸浓度随工艺沿程有显著变化,这与生物处理工艺中微生物代谢活动有关。A combined system of anaerobic/oxic activated sludge process(A/O),Fenton process and biological aerated filter(BAF)was employed to treat high concentration restaurant waste digestion wastewater.The degradation and transformation of TN,NH_(4)^(+)-N,NO_(3)^(-)-N and dissolved organic nitrogen(DON)in each process unit were analyzed,and the changes of molecular weight of DON,amino acid and fluorescence spectrum of organic matter along the process were investigated.Microorganisms were capable of metabolizing both inorganic and organic nitrogen.When the carbon source was sufficient in A/O process,microorganisms transformed inorganic nitrogen into nutrients needed for life activities by using carbon source,so as to reduce the concentration of inorganic nitrogen in the water.When the carbon source was insufficient in BAF,the transformation efficiency of inorganic nitrogen decreased,whereas the transformation of organic nitrogen was not affected.The transformation of organic nitrogen was related to the concentration of microorganism.However,it had little relationship with dissolved oxygen(DO)and carbon source.Fluorescence spectra and molecular weight analysis showed that large molecular nitrogen-containing organic compounds were transformed into small molecular substances after Fenton reaction,and thus be removed by the subsequent BAF process.NO_(3)^(-)-N and DON in effluent from the combined process accounted for 92.5%and 6%of the effluent TN,respectively.Microbial metabolites increased the proportion of large molecular organic compounds in effluent DON.The amino acid concentration in wastewater changed significantly along the process,which was related to the metabolic activities of microorganisms in the biological treatment process.

关 键 词：餐厨垃圾消化废水 FENTON 溶解性有机氮 荧光特性 生物处理工艺 

分 类 号：TU992[建筑科学—市政工程]