Simultaneously enhanced removal of PAHs and nitrogen driven by Fe2+/Fe3+ cycle in constructed wetland through automatic tidal operation

Lu, Jia‐Xing; Guo, Zizhang; Pan, Yitong; Li, Mengting; Xin-han, Chen; He, Mingyu; Wu, Haiming; Zhang, Jian

doi:10.1016/j.watres.2022.118232

Cited by 67 publications

(9 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By contrast, the mean removals of system 2 were 84.3%, 81.7%, and 79.2% (Figure 2d). Consistent with previous studies (Lu et al, 2022;Qian et al, 2023), the amending soil matrix could increase NH 4 + -N removal efficiency. NH 4 + -N was mainly removed by nitrification in the upper part of the SWIS and restricted by the dissolved oxygen (DO) concentration (Qin et al, 2021).…”

Section: Overall Treatment Performance In Swissupporting

confidence: 91%

“…In this study, the abundance of denitrifying functional genes increased with increasing C–N ratios, which was consistent with previous studies (Pan et al, 2017; Zheng et al, 2018). A higher C loading rate could simultaneously enhance biodegradable C availability and electron donors for denitrification (Lu et al, 2022). In addition, the abundance of denitrifying functional genes in the amended SWIS was higher than that in the control system because ZVI could be used as electron donors for denitrification, which may explain the higher pollutant removal efficiency in system 2 (Figure 5).…”

Section: Resultsmentioning

confidence: 99%

“…It is widely acknowledged that amending the soil matrix has a significant impact on enhancing the pollutant treatment performance of SWIS (Cheng et al, 2022; Lu et al, 2022). The commonly used substrates include soil, slag, zeolite, sand, and gravel, but they offer limited electron donors for denitrification (Li et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nitrogen removal performance of improved subsurface wastewater infiltration system under various influent carbon–nitrogen ratios

Zhou,

Li,

Wang

et al. 2024

Water Environment Research

View full text Add to dashboard Cite

Subsurface wastewater infiltration system (SWIS) has been recognized as a simple operation and environmentally friendly technology for wastewater purification. However, effectively removing nitrogen (N) remains a challenge, hindering the widespread application of SWIS. In this study, zero‐valent iron (ZVI) and porous mineral material (PMM) were applied in SWIS to improve the soil matrix. Our results suggested that the addition of ZVI and PMM could simultaneously enhance N removal efficiency and reduce nitrous oxide emissions. This could be attributed to the abundant electrons generated by ZVI alleviating the electronic limitation of denitrification and the porous structure of PMM providing solid phase support for microbial growth. In addition, the abundance of microbial functional genes increased in modified SWIS, which could further explain the higher pollutant removal efficiency. Overall, this study provides new insights into the mitigation of wastewater pollution and greenhouse gas emissions in SWIS.Practitioner Points ZVI and PMM can adapt to different C loads and enhance pollutant removal efficiency in SWIS. Increasing C–N ratios positively affected the nitrate removal performance and negatively affected ammonium removal performance in SWIS. The amending soil matrix promoted the reduction of the N2O to N2 and greenhouse gas emissions were well controlled. The abundance of microbial functional genes increased with the improvement of the soil matrix.

show abstract

Section: Overall Treatment Performance In Swissupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nitrogen removal performance of improved subsurface wastewater infiltration system under various influent carbon–nitrogen ratios

Zhou,

Li,

Wang

et al. 2024

Water Environment Research

View full text Add to dashboard Cite

show abstract

“…In order to improve the oxygen environment of the wetland ecosystem, siphons and air ducts can be added. In order to improve the purification function of the wetland ecosystem, magnetite and other substrates can be arranged in the wetland to achieve this (Lu et al, 2022).…”

Section: Problem Descriptionmentioning

confidence: 99%

Hands-off, artificial construction, or penalty? How to deal with the increasingly polluted coastal wetland ecosystem in China

Bai,

Ma,

2023

Front. Ecol. Evol.

View full text Add to dashboard Cite

As the destruction of coastal wetlands in China becomes more and more serious, the government needs to strengthen the management of the wetland ecosystem. Considering that pollution is an important factor in the destruction of coastal wetlands in China, the government can deal with the problem of wetland pollution through three modes: hands-off, artificial construction, and penalty. In this article, the differential game model is constructed under these three modes. The balanced social benefits of the government and polluting enterprises under the three modes are obtained, and the applicable conditions of various wetland treatment paths are compared. The results show that when the revenue generated by taxation and the indirect income generated by artificial construction are small, the government will choose the laissez-faire mode. However, with the gradual increase of indirect income generated by artificial construction, the government will be inclined to choose the artificial construction mode. When the income from government fines is small, the social benefits of polluters in the hands-off mode are greater than those in the penalty mode. With the increase of fines, the social benefits of polluting enterprises will first decrease and then increase, which will eventually be greater than the social benefits under the hands-off mode.

show abstract

“…Zhou et al (2020) found that when MBC activates peroxydisulfate to degrade 4-chlorophenol, the TOC removal efficiency can reach 63.5% . Recently, Fe has been proven to react with PAHs and eliminate them in aqueous solutions. , However, limited information is available regarding the production of PAHs in Fe-loaded biochar, and there is still a lack of understanding about the relationship between the Fe loading amount and PAH production concentration in biochar. Furthermore, few studies have focused on the ecological risk posed by PAHs in Fe-loaded biochar, and the dynamic changes in ecological risk associated with Fe loading remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Releasing and Assessing the Toxicity of Polycyclic Aromatic Hydrocarbons from Biochar Loaded with Iron

He,

Dai,

et al. 2023

ACS Omega

Self Cite

View full text Add to dashboard Cite

Iron (Fe)-loaded biochar has garnered attention for its potential applications in recent years. However, the pyrolysis process of Fe-loaded biochar generates polycyclic aromatic hydrocarbons (PAHs), which can have adverse effects on both human health and the environment. This study explored the correlation between Fe loading and PAH production in Fe-loaded biochar. The results indicate that increasing Fe loading in biochar reduces the PAH concentration, with the most significant decrease observed in naphthalene (0.02–0.08 mg/kg). This reduction can be attributed to the decrease in precursor compounds (e.g., C 2 H 2 ), substitution of the C=O bond by Fe–O, and a decrease in the dissolved organic matter concentration (3.19–10.76 mg/L) with Fe loading. When Fe loading increased from 0 to 10%, the ecological toxicity of biochar increased by 33.48% due to an elevated production of dibenzo[ a , h ]anthracene, which poses a significant risk to human health. Therefore, it is imperative to take into consideration the ecological risk of PAHs prior to the application of Fe-loaded biochar. This study presents a comprehensive risk assessment of Fe-loaded biochar and provides valuable insights into the optimization of its production and safe application.

show abstract

Simultaneously enhanced removal of PAHs and nitrogen driven by Fe2+/Fe3+ cycle in constructed wetland through automatic tidal operation

Cited by 67 publications

References 48 publications

Nitrogen removal performance of improved subsurface wastewater infiltration system under various influent carbon–nitrogen ratios

Nitrogen removal performance of improved subsurface wastewater infiltration system under various influent carbon–nitrogen ratios

Hands-off, artificial construction, or penalty? How to deal with the increasingly polluted coastal wetland ecosystem in China

Releasing and Assessing the Toxicity of Polycyclic Aromatic Hydrocarbons from Biochar Loaded with Iron

Contact Info

Product

Resources

About