Start-up and characterization of nitrogen and COD removal from mature landfill leachate via CANON process

doi:10.11949/j.issn.0438-1157.20160144

Abstract

Abstract:

The mature landfill leachate from sanitary landfill is difficult to treat because of complicated composition, high concentration of ammonia and low C/N. During this study, a CANON (completely autotrophic nitrogen removal over nitrite) process with an intermittent aeration/anaerobic mixing operational mode was applied to remove nitrogen from mature landfill leachate. After domestication of 130 d, the system was stable with the effluent COD,NH₄^--N and TN (mg·L^-1) of 407±14, 8±4 and 19±4 when the influent COD,NH₄^--N and TN (mg·L^-1) were 2050±250, 1625±75 and 2005±352, respectively. Nitrogen removal from mature landfill leachate could be realized via intermittent aeration/anaerobic mixing CANON process with 98.76% of total nitrogen removal efficiency. Besides, the FISH (Fluorescence in situ hybridization) results showed that under this operational mode, both aerobic ammonium oxidation bacteria and anaerobic ammonium oxidizing bacteria accounted for 19.5%±1.3% and 42.7%±5.02%, respectively, which provided a reference for CANON treating mature landfill leachate in engineering application.

Key words: landfill leachate, CANON, intermittent aeration/anaerobic, partial nitrification, anammox, anaerobic ammonium oxidizing bacteria

摘要：

针对晚期垃圾渗滤液NH₄^--N浓度高、C/N低、深度脱氮困难的问题，采用CANON工艺在曝气/缺氧搅拌循环交替的运行方式下，处理晚期垃圾渗滤液实现了深度脱氮。系统经过130 d的驯化培养后成功启动，长期试验研究结果表明，在进水COD、NH₄^--N、TN浓度（mg·L^-1）分别为2050±250、1625±75和2005±352情况下，出水COD、NH₄^--N、TN浓度（mg·L^-1）能达到407±14、8±4和19±4，总氮去除率达到了98.76%。在未投加外碳源的情况下，CANON工艺在曝气/缺氧搅拌的运行方式下实现了对晚期垃圾渗滤液的深度脱氮。此外，经荧光原位杂交（FISH）检测表明，在该运行方式下能够成功富集氨氧化菌和厌氧氨氧化菌，各占总菌数的19.5%±1.3%和42.7%±5.02%，为CANON工艺用于处理晚期垃圾渗滤液的工程应用提供参考。

关键词: 垃圾渗滤液, CANON, 曝气/缺氧搅拌, 短程硝化, 厌氧氨氧化, 厌氧氨氧化菌

CLC Number:

X703

ZHANG Fangzhai, WANG Shuying, PENG Yongzhen, MIAO Lei, CAO Tianhao, WANG Zhong. Start-up and characterization of nitrogen and COD removal from mature landfill leachate via CANON process[J]. CIESC Journal, 2016, 67(9): 3910-3918.

张方斋, 王淑莹, 彭永臻, 苗蕾, 曹天昊, 王众. CANON工艺处理实际晚期垃圾渗滤液的启动实验[J]. 化工学报, 2016, 67(9): 3910-3918.

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