Optimizing agricultural biomass application to enhance nitrogen removal in vertical flow constructed wetlands for treating low-carbon wastewater

Chen, Yingrun; Zhang, Jian; Guo, Zizhang; Li, Ming; Wu, Haiming

doi:10.1016/j.envres.2022.112867

Cited by 18 publications

(3 citation statements)

References 48 publications

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“…Combustion for cooking and heating is the main method for their management which has been slowly banned due to the air pollution concern. It has been reported that corncob could be used as solid carbon source, and supporters of biofilm in constructed wetland and treating low-carbon-nitrogen wastewater, as it could slowly release dissolved organic carbon [19][20][21]. A positive effect on nitrogen removal has been observed and the total nitrogen concentration was reduced to around 3 mg/L which meets the Class 1A of Integrated Wastewater Discharge Standard.…”

Section: Introductionmentioning

confidence: 80%

Agriculture Waste as Slow Carbon Releasing Source of Mixotrophic Denitrification Process for Treating Low C/N Wastewater

Hong¹,

Tang

Feng

et al. 2022

Separations

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Mixotrophic denitrification has showed great potential for treating wastewater with a low C/N ratio. Mixotrophic denitrification is the process combining autotrophic denitrification and heterotrophic denitrification in one system. It can compensate the disadvantage of the both denitrifications. Instead of using sodium acetate and glucose as carbon source for the heterotrophic denitrification, agriculture solid wastes including rice straw (RS), wheat straw (WS), and corncob (CC) were employed in this study to investigate their potential as carbon source for treating low C/N wastewater. The carbon releasing pattern of the three carbon rich materials has been studied as well as their capacity in denitrification. The results showed that the highest denitrification occurred in the corncob system which was 0.34 kg N/(m3·d). Corncob was then selected to combine with sulfur beads to build the mixotrophic denitrification system. The reactor packed with sulfur bead on the top and corncob on the bottom achieved 0.34 kg N/(m3·d) denitrification efficiency, which is higher than that of the reactor packed with completely mixed sulfur bead and corncob. The autotrophic denitrification and heterotrophic denitrification were 42.2% and 57.8%, respectively. The microorganisms in the sulfur layer were Thermomonas, Ferritrophicum, Thiobacillus belonging to autotrophic denitrification bacteria. Kouleothrix and Geothrix were mostly found in the corncob layer, which have the function for fiber hydrolysis and denitrification. The study has provided an insight into agriculture solid waste application and enhancement on denitrification of wastewater treatment.

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Section: Introductionmentioning

confidence: 80%

Agriculture Waste as Slow Carbon Releasing Source of Mixotrophic Denitrification Process for Treating Low C/N Wastewater

Hong¹,

Tang

Feng

et al. 2022

Separations

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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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“…Constructed wetland (CW) is a low-cost and highly effective water treatment technology, which has been widely used in nitrogen removal of various wastewater [3]. Microbial nitrification and denitrification is the main nitrogen removal mechanism in CWs [4]. Aerobic condition usually benefits nitrification but limits the denitrification process.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Nitrogen Removal Performance in Constructed Wetland by Coupling Partial Tide Flow Operation Mode with Iron-Carbon Micro-Electrolysis Process

Ding¹,

Ji²,

Sun³

et al. 2022

Pol. J. Environ. Stud.

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Constructed wetlands (CWs) with iron-carbon (Fe-C) filler and gravel filler were set up to examine the synthetic effects of partial tide flow operation mode and Fe-C micro-electrolysis on nitrogen removal performance. Submerged emptying ratio (SER) that representing flood and drain period was set to 2:1 and 1:2 respectively for creating aerobic/anoxic alternative conditions. Upper nitrification area of CWs was operated by tide flow mode and the transformation of NH 4 + -N to NO 3 --N was greatly enhanced via the extension of emptying time for air dissolution. Fe-C micro-electrolysis could enhance the availability of carbon sources for biological denitrification and facilitated autotrophic denitrification based on iron oxidation and transfer. It made clear that enhanced denitrification in bottom area contributed to NO 3 --N removal from water body thus facilitating TN removal. Comprehensive and stable COD (84.2±2.0%), NO 3 --N (82.1±2.0%) and TN (55.6±2.0%) removal efficiencies were simultaneously achieved in partial tide flow CW with Fe-C filler under SER of 1:2. The study provided a novel idea for the efficient nitrogen removal in CWs treating eutrophic water.

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Optimizing agricultural biomass application to enhance nitrogen removal in vertical flow constructed wetlands for treating low-carbon wastewater

Cited by 18 publications

References 48 publications

Agriculture Waste as Slow Carbon Releasing Source of Mixotrophic Denitrification Process for Treating Low C/N Wastewater

Agriculture Waste as Slow Carbon Releasing Source of Mixotrophic Denitrification Process for Treating Low C/N Wastewater

Technological Innovations in the Application of Constructed Wetlands: A Review

Enhanced Nitrogen Removal Performance in Constructed Wetland by Coupling Partial Tide Flow Operation Mode with Iron-Carbon Micro-Electrolysis Process

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