Co-occurrence of autotrophic and heterotrophic denitrification in electrolysis assisted constructed wetland packing with coconut fiber as solid carbon source

Fan, Xing; Li, Jiao; He, Lei; Wang, Yingmu; Zhou, Jiong; Zhou, Jian; Liu, Caihong

doi:10.1016/j.chemosphere.2022.134762

Cited by 29 publications

(3 citation statements)

References 52 publications

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“…Other residues that can be beneficial for the functions of a CW are some forms of agricultural waste and, in cases with low-carbon wastewater, this waste functions as biomass that contributes solid carbon to the system, helping in the denitrification of the water [31], as has been demonstrated with coconut fiber [32].…”

Section: Sustainable Materialsmentioning

confidence: 99%

Technological Innovations in the Application of Constructed Wetlands: A Review

Fernández Ramírez,

Zamora-Castro,

Sandoval-Herazo

et al. 2023

Processes

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Constructed wetlands (CWs) are highly effective in wastewater treatment and have generated lines of research with a focus on technological development and implemented innovations. This work concentrates on the most recent technical and scientific advances that have obtained optimal results in the construction of CWs using sustainable materials and the use of ornamental plants and other aquatic plants. Efficiency is also documented through models and simulation with neural networks, the use of the random forest method, and the use of software such as MODFLOW, MODPATH, and COMSOL Multiphysics. The information shown is structured by geographical area and addresses regions of Africa, Asia, Europe, North America, South America, and Oceania. It is important to consider that the optimization and innovation of CW for pollutant removal may benefit developing countries that do not have sufficient infrastructure to meet the demand for municipal and industrial wastewater.

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Section: Sustainable Materialsmentioning

confidence: 99%

Technological Innovations in the Application of Constructed Wetlands: A Review

Fernández Ramírez,

Zamora-Castro,

Sandoval-Herazo

et al. 2023

Processes

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“…Nitrogen in wastewater is mainly in the form of NH 4 + -N, NO 3 − -N, NO 2 − -N and TN (Fan et al 2022). Jia et al (2020) reported that the removal of nitrogen from wastewater in CWs is mainly through nitri cation and denitri cation, with substrate adsorption accounting for less than 3%.…”

Section: Effect Of Different Carbon Source Additions On Nitrogen Remo...mentioning

confidence: 99%

“…Denitri cation converts NO 3 − -N and NO 2 − -N to N 2 by the participation of denitrifying bacteria (Luo et al 2020). Denitri cation plays a critical role in CWs, and denitrifying bacteria require electrons and nutrients from carbon sources Fan et al 2022). However, the C/N ratio of rural wastewater are gradually decreasing (Zhou et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Application of alkali-heated corncobs enhanced nitrogen removal and microbial diversity in constructed wetlands for treating low C/N ratio wastewater

Liang,

Hao,

et al. 2023

Environ Sci Pollut Res

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Lack of carbon source is the main factor limiting denitri cation of low C/N ratio wastewater in constructed wetlands (CWs). Agricultural waste has been considered as a supplementary carbon source but research is still limited. To solve this problem, ferric carbon (Fe-C) + zeolite, Fe-C + gravel and gravel were used as substrates to build CWs in this experiment, aiming to investigate the effects of different carbon sources (rice straw, corncobs, alkali-heated corncobs) on nitrogen removal performance and microbial community structure in CWs for low C/N wastewater. The results demonstrated that the microbial community and e uent nitrogen concentration of CWs were mainly in uenced by the carbon source rather than the substrate. Alkali-heated corncobs signi cantly enhanced the removal of NO 2 − -N, NH 4 + -N, NO 3 − -N and TN. Carbon sources addition increased microbial diversity. Alkali-heated corncobs addition signi cantly increased the abundance of heterotrophic denitrifying bacteria (Proteobacteria and Bacteroidota). Furthermore, alkali-heated corncobs addition increased the copy number of nirS, nosZ and nirK genes while greenhouse gas uxes were lower than common corncobs. In summary, alkali-heated corncobs can be considered as an effective carbon source.

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