阴极层构型对电极氨氧化人工湿地运行性能的影响

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摘要在电极氨氧化型人工湿地(CW)中设置阴极层,促进其中阴极自养反硝化作用的发生,并探究了阴极层构型对系统运行性能的影响,解析且阐释了对应条件下装置中的微生物特性及氮素转化过程.结果表明,阴极层构型会显著影响其中关键功能微生物的丰度,导致该区域内阴极自养反硝化作用的强度不尽相同,随之造成了装置脱氮产电性能的差异.当在电极氨氧化型CW的阴极层中布设生物阴极且填充废砖块时,阴极层较大的比表面积、较高的水溶性盐总量及Fe含量提高了其中参与阴极自养反硝化反应的功能微生物(尤其是Geobacter、Thauera、Thiobacillus、Pseudomonas和Hydrogenophaga)的丰度及活性,使阴极自养反硝化作用得到较大程度的强化并在系统中形成了以电极氨氧化-阴极自养反硝化为主的多路径耦合脱氮体系.此时装置具备理想的运行性能,其COD、TP、TN和NH₄⁺-N去除率分别稳定在(88.79±2.58)%、(98.19±0.72)%、(91.34±3.58)%和(96.78±2.90)%,输出电压和输出功率密度峰值分别为(787.99±89.43)mV和214.41W/m³.本研究可为新型强化脱氮CW工艺的研发与设计提供参考.

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	徐湛禹
	陆心怡
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	潘玲阳
	李龙雪
	魏晓丽
	倪草梅
	李刚
	王振

关键词 ：人工湿地(CW), 阴极层构型, 电极氨氧化, 阴极自养反硝化, 脱氮

Abstract：A cathode layer was installed in a constructed wetland (CW) based on electrode-dependent ammonium oxidation, so as to achieve the occurrence of cathodic autotrophic denitrification in the layer, and it was conducted to explore the effect of cathode layer configuration on operational performance of the device, simultaneously, the microbial characteristics and the associated nitrogen transformation mechanisms in the system were also analyzed and elucidated. The results showed that, cathode layer configuration could significantly affect quantities of the critical functional microorganisms in the cathode layer, and then distinction in the intensity of cathodic autotrophic denitrification occurred in the region, leading to differences of nitrogen removal and electricity generation among the three devices. Regarding to the CW based on electrode-dependent ammonium oxidation, as bio-cathode was installed in its cathode layer filled with broken bricks, abundances and activities of the functional microbes (especially Geobacter, Thauera, Thiobacillus, Pseudomonas, and Hydrogenophaga) involved in cathodic NO_x^--N reduction increased since the improved cathode layer had lager specific surface area, higher total content of water-soluble salt, and Fe content. Correspondingly, multi-path coupled nitrogen removal system based on “electrode dependent ammonium oxidation-cathodic autotrophic denitrification” was established in the equipment owing to the largely enhancement of the cathodic autotrophic denitrification. Under the circumstances, ideal operational performance of the CW could be achieved, its COD, TP, TN and NH₄⁺-N removal rates could respectively reached up to (88.79±2.58)%, (98.19±0.72)%, (91.34±3.58)%, and (96.78±2.90)% during the stable operation phase. Moreover, the output voltage and the maximum power density of the device was (787.99±89.43) mV and 214.41W/m³, respectively. This study should be conducive to research, development, and design of the new type of constructed wetland with enhancement of nitrogen removal.

Key words： constructed wetland (CW) cathode layer configuration electrode-dependent ammonium oxidation cathodic autotrophic denitrification nitrogen removal

收稿日期: 2024-05-10

PACS:

X703

基金资助:国家自然科学基金项目(52370160);安徽省自然科学基金资助项目(2008085ME162);安徽省高等学校科学研究资助项目(2022AH040121,2023AH051812)

通讯作者: 王振,副教授,zwang@ahau.edu.cn E-mail: zwang@ahau.edu.cn

作者简介: 徐湛禹(2000-),男,安徽合肥人,硕士研究生,主要从事污水生物资源化处理与回用技术研究.发表论文1篇.986495702@qq.com.

引用本文:

徐湛禹, 陆心怡, 汤翀, 潘玲阳, 李龙雪, 魏晓丽, 倪草梅, 李刚, 王振. 阴极层构型对电极氨氧化人工湿地运行性能的影响[J]. 中国环境科学, 2024, 44(12): 6775-6786. XU Zhan-yu, LU Xin-yi, TANG Chong, PAN Ling-yang, LI Long-xue, WEI Xiao-li, NI Cao-mei, LI Gang, WANG Zhen. Effect of cathode layer configuration on operational performance of a constructed wetland based on electrode-dependent ammonium oxidation. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(12): 6775-6786.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I12/6775

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