乳酸钠和乙酸钠作为碳源对生物脱氮的影响  

Effect of Sodium Lactate and Sodium Acetate as Carbon Sources on Biological Nitrogen Removal

作　　者：张佳颖 刘心怡 周俊才 孟雯 李晓玲[1,2] 高明 汪群慧 ZHANG Jia-ying;LIU Xin-yi;ZHOU Jun-cai;MENG Wen;LI Xiao-ling;GAO Ming;WANG Qun-hui(School of Civil Engineering,Chang'an University,Xi'an 710061,China;Key Laboratory of Water Supply and Drainage,Chang'an University,Xi'an 710054,China;School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]长安大学住建部给水排水重点实验室,陕西西安710054 [3]北京科技大学能源与环境工程学院,北京100083

出　　处：《中国给水排水》2023年第19期83-88,共6页China Water & Wastewater

基　　金：国家重点研发计划项目(2019YFC1906302);中央高校基本科研业务费专项资金资助项目(300102282104)。

摘　　要：基于SBR反应器,通过与传统碳源乙酸钠进行对比,探究人工配水条件下以乳酸钠作为碳源的脱氮效果以及生物可利用性等差异。结果表明,在进水NH_(4)^(+)-N为32 mg/L的条件下,当COD为200 mg/L时,乙酸钠的脱氮效果优于乳酸钠;当COD为300 mg/L时,乳酸钠和乙酸钠两种体系的总氮去除率相当,且均达到最高值,分别为85.73%和83.04%;当COD为400 mg/L时,乙酸钠对硝化过程的抑制作用明显,进而使得体系的总氮去除率较低,仅为56.51%,而乳酸钠体系的脱氮效果良好。运行过程中两种体系均出现了污泥膨胀现象,且乳酸钠体系膨胀更明显,同时随着COD浓度的增加,膨胀现象加剧并伴有污泥结块现象。两种体系中的微生物种类及占比相似,表明乳酸钠与乙酸钠作为碳源的脱氮效果良好,有相似的生物可利用性。在乳酸钠体系中,Ferruginibacter占比较高,说明乳酸钠作为外加碳源时污泥容易产生结块膨胀现象。This study compared the differences of nitrogenremoval performance and bioavailability between sodium lactate and traditional carbon source sodium acetate in a SBR for the treatment of simulated wastewater.When the influent NH-N and COD were 32 mg/L and 200 mg/L respectively,the nitrogen removal performance of sodium acetate was better than that of sodium lactate.When the COD was 300 mg/L,the total nitrogen removal rates of both systems were comparable and reached the highest values of 85.73% and 83.04% respectively.When the COD was 400 mg/L,sodium acetate obviously inhibited the nitrification process,resulting in the total nitrogen removal rate of the system as lower as 56.51%.Conversely,good denitrification performance of the sodium lactate system was obtained.Sludge bulking was observed in both systems during the operation,and the phenomenon was more pronounced in the sodium lactate system.With the increase of COD,the sludge bulking was aggravated and accompanied by sludge agglomeration.The microbial species and their relative abundance were comparable in the two systems,indicating that sodium lactate and sodium acetate as carbon sources had similar bioavailability and good nitrogen removal performances.In the sodium lactate system,Ferruginibacter accounted for a relatively high abundance,indicating that sludge agglomeration and bulking were prone to occur when sodium lactate was employed as the additional carbon sources.

关 键 词：乳酸钠 乙酸钠 碳源 生物脱氮 COD 污泥膨胀 

分 类 号：TU992[建筑科学—市政工程]