Simultaneous enhanced ammonia and nitrate removal from secondary effluent in constructed wetlands using a new manganese-containing substrate

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Zhihao Xian, Jun Yan, Jingyi Dai, Hao Wu, Xin Zhang, Wenbo Nie, Fucheng Guo, Yi Chen
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Abstract

Constructed wetlands (CWs) are widely used to treat secondary effluent. However, simultaneously removing ammonia (NH4+-N) and nitrate (NO3–N) is challenging because of insufficient oxygen and carbon sources. In this study, a novel composite material (MPCM) comprising MnO2 and polycaprolactone was developed as a substrate for CWs to enhance the synchronous removal of NH4+–N and NO3–N. The CWs with a higher MPCM content (H-CW), lower MPCM content (L-CW), and controlled CW (C-CW) exhibited average NH4+–N removal efficiencies of 75.69%, 70.49%, and 52.40%, respectively. The 15N isotope tracking technique showed that NH4+–N removal was attributed to anaerobic ammonia oxidation mediated by MnO2 reduction (Mnammox), which accounted for 17.16%–27.24% of the NH4+–N removal in the composite material layers (0–20 cm) of the H-CW and L-CW. The richness of ammonia oxidizers in the upper layers (40–50 cm) of the H-CW and L-CW further facilitated NH4+–N removal. Moreover, the average total nitrogen (TN) removal efficiencies of the H-CW and L-CW were 1.99 and 1.59 times that of C-CW, respectively, owing to enhanced denitrification by MPCM. Furthermore, N2O emissions were reduced by 81.31% and 70.83% in the H-CW and L-CW, respectively. This study provides an effective approach for improving nitrogen removal and reducing N2O emissions during the treatment of secondary effluent by CWs.

Abstract Image

使用新型含锰基质同时提高构建湿地对二级污水中氨和硝酸盐的去除率
人工湿地 (CW) 广泛用于处理二级污水。然而,由于氧气和碳源不足,同时去除氨氮(NH4+-N)和硝酸盐(NO3--N)具有挑战性。本研究开发了一种由二氧化锰和聚己内酯组成的新型复合材料(MPCM),作为化武的基质,以提高同步去除 NH4+-N 和 NO3--N的能力。MPCM 含量较高的 CW(H-CW)、MPCM 含量较低的 CW(L-CW)和受控 CW(C-CW)的 NH4+-N 平均去除率分别为 75.69%、70.49% 和 52.40%。15N 同位素跟踪技术表明,NH4+-N 的去除主要归因于 MnO2 还原(Mnammox)介导的厌氧氨氧化作用,在 H-CW 和 L-CW 的复合材料层(0-20 cm)中,Mnammox 占 NH4+-N 去除量的 17.16%-27.24%。H-CW 和 L-CW 上层(40-50 厘米)丰富的氨氧化剂进一步促进了 NH4+-N 的去除。此外,由于 MPCM 增强了反硝化作用,H-CW 和 L-CW 的平均总氮(TN)去除率分别是 C-CW 的 1.99 倍和 1.59 倍。此外,H-CW 和 L-CW 的 N2O 排放量分别减少了 81.31% 和 70.83%。这项研究为化武处理二级出水时提高脱氮效果和减少 N2O 排放提供了一种有效方法。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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