Enhanced phosphorus removal of constructed wetland modified with novel Lanthanum-ammonia-modified hydrothermal biochar: Performance and mechanism

Shang, Zhenxin; Wang, Yuru; Wang, Saqi; Jin, Fenglin; Hu, Zhen

doi:10.1016/j.cej.2022.137818

Cited by 25 publications

(1 citation statement)

References 47 publications

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“…Moreover, the utilization of lanthanummodi ed y ash zeolite as a wetland media material can enhance the effectiveness of P removal. Similar studies, Shang et al (Shang et al, 2022) prepared lanthanum-ammonia modi ed hydrothermal biochar (La-A-HC) which improved total P removal in wetlands by 14.8% compared to unmodi ed biochar at 5 mg/L in uent P. These ndings provide strong evidence for the signi cant role of lanthanum-modi ed adsorbent materials in wetland applications.…”

Section: N and P Removalsupporting

confidence: 58%

Synthesis of lanthanum and waste lye modified-zeolite from fly ash and its application in constructed wetland for nitrogen and phosphorus removal

Liu,

Liang,

2023

Preprint

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Excess inputs of nitrogen (N) and phosphorus (P) can lead to imbalance in water ecosystems and thus trigger eutrophication. In this study, a novel Lanthanum modified zeolite synthesized from fly ash (LZFA) was prepared and used as a modified substrate for constructed wetland (CW) to enhance N and P removal. Single-factor and surface methodology (RSM) were used to optimize the preparation. The results showed that the maximum adsorption capacities of N and P were 17.26 mg/g and 21.48 mg/g. The decline in sorption capacity or diffusion coefficients of LZFA for N compared to zeolite synthesized from fly ash (ZFA) is mainly due to the decrease in surface negative charge and cation exchange capacity. The mechanism of P adsorption is attributed to the formation of La-O-P monodentate, bidentate mononuclear or bidentate binuclear inner-sphere complexation. Meanwhile, the introduction of Ca in waste lye is also involved in the P reaction. The N and P removal rates of LZFA modified subsurface flow constructed wetland (SFCW) were 2.67% and 7.33% higher than SFCW modified with gravel. In practical production, if a circular chain from coal ash production to use in green plant fertilizer can be established, the cost of treating P can be significantly reduced.

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Section: N and P Removalsupporting

confidence: 58%

Synthesis of lanthanum and waste lye modified-zeolite from fly ash and its application in constructed wetland for nitrogen and phosphorus removal

Liu,

Liang,

2023

Preprint

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Nitrogen removal and microbial community variation in a shallow constructed wetland with Fe–C porous filter material as substrate

Chu,

Cao,

et al. 2024

CLEAN Soil Air Water

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This study aims to examine the nitrogen removal characteristics and microbial community variation at low hydraulic retention time (HRT) in a shallow constructed wetland (SCW) using iron–carbon (Fe–C) porous filter material (PFM) as substrate. Effects of influent nitrogen forms and chemical oxygen demand (COD)/N ratio on nitrogen removal performance at HRT of 1 day were investigated. Results showed that total nitrogen (TN) removal declined with the decrease of influent NH4+‐N‐to‐NO3−‐N ratio. When the influent NH4+‐N/NO3−‐N ratio was 0.1, TN removal decreased by 15.4% compared with that at ratio of 2.0. The increase of influent COD/N ratio enhanced NO3−‐N reduction, and TN removal reached 74.5% at influent COD/N ratio 7.0. The microbial community was analyzed for the biofilm samples on Fe–C PFM at front (WF), middle (WM), and back (WB) of SCW. Proteobacteria, Bacteroidetes, Chloroflexi, and Firmicutes were dominant bacteria phyla. The relative abundance of genera involved in the nitrification and denitrification decreased with the influent flow. The iron autotrophic denitrifying and macromolecular organics degrading bacteria were abundant in the middle and back of SCW. Microbial nitrification and denitrification, plant uptake, and plant synergism contributed to 86.3%, 7.41%, and 19.9% of N removal, respectively. These results demonstrated that the SCW with Fe–C PFM as substrate was efficient in nitrogen removal at low HRT.

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In Situ Ca‐ and Mg‐ Codoped Biochar Derived from Tobacco Stem for Phosphate Adsorption and Desorption

Tu,

Cen,

Deng

et al. 2024

ChemistrySelect

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Phosphorus is an important element for plant growth. The efficient use and recovery of phosphorus is crucial due to limited phosphate resource reserves. This study explored the potential application of an in situ Ca and Mg co‐doped biochar derived from tobacco stem to reclaim and reuse phosphate from aqueous solutions. We performed various batch adsorption experiments and industrial analysis based on different parameters. The findings indicate that biochar prepared using the raw material particle size range of 0.85–2 mm and pyrolyzed at 800 °C presented good pore structure and specific surface area. Ca and Mg elements in biochar exhibited great influence on its phosphate adsorption property. The maximum phosphate adsorption capacity of the tobacco stem‐based biochar was 54.66 mg/g, and the experimental data agreed with the Langmuir equation, suggesting monolayer adsorption. The adsorption process conformed to the pseudo‐second‐order kinetic equation, indicating that chemisorption was the dominant adsorption process and that the adsorption was controlled by intra‐particle diffusion. Furthermore, phosphate adsorbed on tobacco stem‐based in situ Ca and Mg co‐doped biochar was released under acidic, alkaline, and neutral conditions. Therefore, in situ Ca and Mg co‐doped biochar prepared from tobacco stems is a potential environmentally friendly and low‐cost adsorbent for phosphorus recovery.

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Enhanced phosphorus removal of constructed wetland modified with novel Lanthanum-ammonia-modified hydrothermal biochar: Performance and mechanism

Cited by 25 publications

References 47 publications

Synthesis of lanthanum and waste lye modified-zeolite from fly ash and its application in constructed wetland for nitrogen and phosphorus removal

Synthesis of lanthanum and waste lye modified-zeolite from fly ash and its application in constructed wetland for nitrogen and phosphorus removal

Nitrogen removal and microbial community variation in a shallow constructed wetland with Fe–C porous filter material as substrate

In Situ Ca‐ and Mg‐ Codoped Biochar Derived from Tobacco Stem for Phosphate Adsorption and Desorption

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