Improving the removal efficiency of nitrogen and organics in vertical-flow constructed wetlands: the correlation of substrate, aeration and microbial activity

Xu, Wenxue; Yang, Biao; Wang, Hui; Wang, Shuzhi; Jiao, Keqin; Zhang, Chuanfeng; Li, Feng; Wang, Haixia

doi:10.1007/s11356-022-23746-7

Cited by 6 publications

(4 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Removal efficiencies of more than 90% for suspended solids and organic COD pollutants were demonstrated by Pascual et al [32] and Aguilar et al [33] in studies of aerated HF-CW systems. Lower removal potential for these pollutants (around 65%) was found in their studies by Ugetti et al [34] and Xu et al [35]. Far fewer studies refer to VF-CW and aerated VF-HF CW hybrid systems.…”

Section: Introductionmentioning

confidence: 85%

Organic Pollutants Removal in a Hybrid Constructed Wetland Wastewater Treatment Plant with an Aeration System

Marzec,

Listosz,

Malik

et al. 2024

Water

View full text Add to dashboard Cite

This study presents the efficiency of TSS and organic pollutants (BOD5 and COD) removal in a hybrid constructed wetland wastewater treatment plant (VF-HF type) with an aeration system. This study was conducted over 6 years (2017–2022) in a facility with a capacity of 4.5 m3/day located in southeastern Poland and designed to treat real domestic wastewater from a school building. The studied facility consists of a three-chambered septic tank, a pumping station with an aeration system, and two beds with vertical and horizontal flow planted with giant miscanthus and willow. As a result of artificial aeration, the dissolved oxygen concentration in wastewater after mechanical treatment increased significantly, by an average of 1.18 mg O2/L, and was negatively correlated with wastewater temperature. The cumulative pollutant removal effects of the treatment plant (primary settling tank + VFCW + HFCW) were 81% for TSS, 98% for BOD5, and 89% for COD. There was no statistically significant effect of aeration on the organic pollutant removal effects in the VF bed, and such an effect was found for the temperature of wastewater entering the VF bed. The TSS, BOD5, and COD removal effects in the VF bed and BOD5 in the VF-HF system were positively correlated with air temperature. The technological reliability of the treatment plant was 98% for TSS and 100% for BOD5 and COD. The use of artificial aeration of wastewater makes it possible to achieve high organic pollutant removal efficiency in SSF CWs and to compensate for limitations due to the reduction in the area of constructed wetland beds.

show abstract

Section: Introductionmentioning

confidence: 85%

Organic Pollutants Removal in a Hybrid Constructed Wetland Wastewater Treatment Plant with an Aeration System

Marzec,

Listosz,

Malik

et al. 2024

Water

View full text Add to dashboard Cite

show abstract

“…Additionally, microorganisms contribute to the breakdown of organic matter present in the CWs. The decomposition of organic material releases nitrogen in various forms, and microorganisms assist in converting these nitrogen compounds into more stable forms or facilitating their removal from the system [46]. In addition, microorganisms support the establishment of a diverse and stable ecosystem within CWs.…”

Section: Current Research Hotspot Analysismentioning

confidence: 99%

Bibliometric Analysis of Nitrogen Removal in Constructed Wetlands: Current Trends and Future Research Directions

Dong,

Kuang

2024

Water

View full text Add to dashboard Cite

Nitrogen pollution in water environments has reached critical levels globally, primarily stemming from agricultural runoff, industrial discharges, and untreated sewage. The excessive presence of nitrogen compounds poses a significant threat to water quality, leading to adverse impacts on ecosystems and human health. Reaching a breakthrough in the technology of constructed wetlands (CWs) for mitigating nitrogen pollution is hindered by existing knowledge gaps regarding the mechanisms involved in the removal process. Reaching this understanding, we offer a comprehensive summary of current advancements and theories in this research field. Initially, bibliometric techniques were employed to identify yearly patterns in publications and areas of research focus. Subsequently, the chosen documents underwent statistical analysis using VOSviewer_1.6.20 to determine countries’ annual productivity, significant publication years, influential authors, keyword clustering analysis, and more. Finally, a comprehensive overview is provided on the elimination of nitrogen through CWs, encompassing insights into microbial communities and structure types. This analysis aims to uncover potential strategies for optimizing the rate of nitrogen removal. Furthermore, this study elucidates the current research trend concerning the nitrogen removal performance of CWs and identifies challenges and future research directions in this field.

show abstract

“…The substrate matrix composition and its heterogeneity play a highly significant role in the working capacity of floating CWs [17,18]. Till now, substrate matrices, such as aluminum mud [19], zeolite, slag [4,20], or composite materials [21], etc., have been used widely for the designing of the filling substratum for the CWs. It is found that the supply of external carbon stock in the substrate matrix could be a viable approach not only to feed active microbial communities [2,22] but also to enhance the adsorptive capacity of filling beds in CWs [22].…”

Section: Introductionmentioning

confidence: 99%

“…It is found that the supply of external carbon stock in the substrate matrix could be a viable approach not only to feed active microbial communities [2,22] but also to enhance the adsorptive capacity of filling beds in CWs [22]. In this context, BC has been utilized widely as a carbon substance in the composite substrate matrix in the CWs due to its fine ability to adsorb various types of organic and inorganic pollutants [16,23,24] and support the growth of microbial communities in the substrate matrix [20,25]. The characteristics of BC, such as high porosity, broad surface area, significant cation exchange capacity, etc., make BC a vital substance for enhanced performance by CWs [3,22,26].…”

Section: Introductionmentioning

confidence: 99%

Treatment of High Nutrient-Loaded Wastewater in a Constructed Floating Wetland with Different Configurations: Role of Lantana Biochar Addition

2022

View full text Add to dashboard Cite

Constructed wetlands (CW) with carbon stock in substrate matrix show high efficiency in wastewater nutrient removals. In this study, five batch-scale CW setups with varying Lantana weed biochar (BC) doses (5, 10, and 15%) in substrate matrix were established and changes in high nutrient-loaded wastewater parameters, ammonium N (NH4+-N), chemical oxygen demand (COD), nitrate (NO3-N), sulfate (SO4−2), and phosphate (PO4−3), were monitored for 240 h hydraulic retention time (HRT). BC amount directly affected the removal mechanism of CWs and a significant reduction in COD (>92.71%) was recorded. CW setup with a 15% BC dose showed the maximum removal of PO4−3 (79.06%), NH4+-N (78.79%), SO4−2 (67.93%), and NO3-N (77.42%) from wastewater. The theory of BC facilitated physical removal, microbial facilitation, and chemical kinetics improvements are proposed for better removal of wastewater nutrients in studied CWs. Research results could be utilized to design a low-cost domestic wastewater treatment facility using BC for rural areas under a decentralized water treatment program.

show abstract

Improving the removal efficiency of nitrogen and organics in vertical-flow constructed wetlands: the correlation of substrate, aeration and microbial activity

Cited by 6 publications

References 58 publications

Organic Pollutants Removal in a Hybrid Constructed Wetland Wastewater Treatment Plant with an Aeration System

Organic Pollutants Removal in a Hybrid Constructed Wetland Wastewater Treatment Plant with an Aeration System

Bibliometric Analysis of Nitrogen Removal in Constructed Wetlands: Current Trends and Future Research Directions

Treatment of High Nutrient-Loaded Wastewater in a Constructed Floating Wetland with Different Configurations: Role of Lantana Biochar Addition

Contact Info

Product

Resources

About