Study on Phosphorus Removal Pathway in Constructed Wetlands with Thermally Modified Sepiolite

Gao, Ping; Zhang, Chao

doi:10.3390/su141912535

Cited by 11 publications

(4 citation statements)

References 37 publications

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“…Sedimentation is often cited as the most important process for the retention of phosphorus in wetlands [44]. Other mechanisms include the adsorption of phosphorus by the substrate [45] and Puptake by macrophytes [46]. A systematic review of the efficiency of created and restored freshwater wetlands showed that the median removal rate of TP is 1.2 g m −2 year −1 , with a removal efficiency of 46%; both are significantly correlated with the inlet TP concentration, the hydraulic loading rate and the annual average air temperature [44].…”

Section: Sampled Water Quality Monitoringmentioning

confidence: 99%

Quantitative, Qualitative and Thermal Aspects of Rainwater Retention on Wetland Roofs

Karczmarczyk,

Baryła,

Szejba

et al. 2023

Sustainability

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Wetland roofs (WRs) are a multi-functional green infrastructure measure to mitigate the negative effects of climate change. The present work advances knowledge in the field of WRs by analyzing the performance of rainwater management, focused on water sufficiency, water quality and cooling potential. Automatic monitoring, covering weather conditions, temperature and the conductivity of WR water, and the amount of outflow into retention tanks, was supported with automated sampling of water for laboratory analysis of BOD5, phosphate phosphorus, suspended solids, electrical conductivity (EC), redox potential (Eh), color and pH. From April to September 2022, a precipitation deficit of 395.45 mm and a negative climatic water balance of 267.91 mm were observed. It was necessary to fill up the system several times in order to maintain water at the assumed level. In most cases, the values of EC observed during the monitoring period were higher than those reported for rainwater. Continuous monitoring of EC in the wetland was a useful tool for the observation of operating activities in the system; however, it was not sufficient for system control. BOD5 values did not exceed 6 mg dm−3 and were lower than reported for urban rainwater retention reservoirs. Suspended solids values did not exceed 27 mg dm−3. Color varied between 0 and 101 PtCo, with the highest values noted in July and the beginning of August. The pH value ranged between 7.28 and 8.24. The Eh varied between 155 and 306 mV, with lower values associated with the filling up of the wetland. Peak values of PO4-P were observed between the end of July and the beginning of September 2022, with a maximum concentration of 232 µg dm−3 utilized by the wetland within one month. Monitoring of the water and air temperature showed a thermal buffering effect of the wetland. The results of the research, conducted during the growing season, allow for better management of rainwater on the roof. However, there is a need to expand the scope of the analyzed water quality parameters. Although there are several limitations to the analysis, the present study partially fills the existing knowledge gap and may generate further interest in this topic among researchers and decision-makers.

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Section: Sampled Water Quality Monitoringmentioning

confidence: 99%

Quantitative, Qualitative and Thermal Aspects of Rainwater Retention on Wetland Roofs

Karczmarczyk,

Baryła,

Szejba

et al. 2023

Sustainability

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“…In general, the efficiency of phosphorus-removal in these systems is mostly dependent on several factors such as the nature of the substrate, environmental conditions, and plant species [53,57,92]. The major mechanisms for phosphorus-removal are natural sedimentation, precipitation, adsorption, and uptake by plants [108,112,115]. The precipitation process involves the conversion of dissolved phosphorus into a solid form that can settle to the bottom of the wetland, being later incorporated into sediment.…”

Section: Mechanisms Involved In Pollutant Removal From Domestic Waste...mentioning

confidence: 99%

“…The precipitation process involves the conversion of dissolved phosphorus into a solid form that can settle to the bottom of the wetland, being later incorporated into sediment. While adsorption plays a crucial role in phosphorusremoval, in the context of a VFCW system, phosphorus in wastewater can attach to the surfaces of substrate particles or plant roots, thereby reducing phosphorus concentrations in the treated water [53,115].…”

Section: Mechanisms Involved In Pollutant Removal From Domestic Waste...mentioning

confidence: 99%

Vertical and Hybrid Constructed Wetlands as a Sustainable Technique to Improve Domestic Wastewater Quality

Masharqa,

Al-Tardeh,

Mlih

et al. 2023

Water

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Developing safer and environmentally friendly methods for wastewater management is a crucial issue worldwide. Pollutants stemming from pure elemental, organic or inorganic compounds, or microbial sources, are an increasing problem in domestic wastewater. Constructed wetlands (CWs) have been used as an effective and low-cost method of treating different types of polluted water. This review paper focuses on the effectiveness of pollutant-removal from domestic wastewater using vertical flow constructed wetlands (VFCWs) and hybrid constructed wetlands (HCWs). Meta-analysis and ANOVA tests were conducted to analyse the potentiality of VFCW and HCW as a remedy for domestic wastewater and the effect of using different substrates and plant species. Meta-analysis shows a high significance (p = 0.001) between the interactions (method, plant, and substrate) on the pollutant’s removal efficiency. In both analysis methods, there were no significant differences between VFCW and HCW for the same pollutant (p > 0.05); the average removal percentages when using VFCW and HCW (according to ANOVA analysis) were 80% vs. 90% for BOD, 78% vs. 77% for COD, 75% vs. 83% for ammonium-N, 48% vs. 56% for TN, and 60% for TP, respectively. Moreover, this review article presents a comprehensive overview of the removal mechanisms for organics, inorganics, and metals from domestic wastewater using VFCW, and the effects of environmental parameters including substrate type, plant species, and dissolved oxygen which have direct and indirect impacts on physical, chemical, and biological removal mechanisms. In conclusion, VFCWs and HCWs seem to be an excellent approach, offering economical and environmentally friendly techniques for domestic wastewater treatment, but VFCW is considered simpler and more applicable for setting up on-site near houses, as there is no significant difference (p > 0.05) between applying VFCW or HCW on removal percentages for most pollutants, according to ANOVA testing. More work is needed to study the effect of non-planted VFCWs and HCWs on removal efficiency.

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“…Constructed wetlands mimic natural wetlands, purifying wastewater through an artificially designed structure that contains a substrate, aquatic plants, and microorganisms [15]. Depending on the engineering design and water flow pattern, constructed wetlands can be categorized into surface flow constructed wetlands (SFCW), horizontal subsurface flow constructed wetlands (HSSFCW), or vertical subsurface flow constructed wetlands (VSS-FCW) [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study of a New Photocatalytic Film Process Combined with a Constructed Wetland and an Analysis of Reoxygenation Pathways in a Water Body

Chen,

Ye,

Chen

et al. 2024

Sustainability

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Pollution in water environments hinders both social progress and economic development. Wastewater treatment and the sustainable use of water resources are important factors in solving this problem. In a previous study, the authors proposed a process that used photocatalytic film as a back-end treatment in a composite iron–carbon constructed wetland (WIC&PF) to restore a mildly eutrophic water body. This method has strong reoxygenation effects, and can efficiently remove pollutants; these are qualities that have not been mentioned in previous studies regarding constructed wetlands. In this study, the authors further investigated the effectiveness of this process by using a photocatalytic film as a front-end treatment for a composite iron–carbon constructed wetland (PF&WIC) to restore a mildly eutrophic water body. The results showed NH4+-N, TN, TP, COD, and chlorophyll a removal rates using PF&WIC of 79.1 ± 6.6%, 76.8 ± 6.5%, 77.0 ± 5.4%, 77.3 ± 7.2%, and 91.7 ± 5.6%, respectively. The DO concentration of the water body increased compared with that of the effluent. The bacterial species and their abundance in the lake water also changed significantly, and photosynthetic autotrophic bacteria (Cyanobium PCC-6307) became the most dominant bacteria, and this played an important role in reoxygenating the water body. In comparing these results to those of our previous study, the removal of pollutants with PF&WIC was close to that with WIC&PF, but the reoxygenation effect of PF&WIC on the water body was significantly worse than that of WIC&PF; thus, WIC&PF is the more reasonable choice for treating eutrophic water bodies.

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Study on Phosphorus Removal Pathway in Constructed Wetlands with Thermally Modified Sepiolite

Cited by 11 publications

References 37 publications

Quantitative, Qualitative and Thermal Aspects of Rainwater Retention on Wetland Roofs

Quantitative, Qualitative and Thermal Aspects of Rainwater Retention on Wetland Roofs

Vertical and Hybrid Constructed Wetlands as a Sustainable Technique to Improve Domestic Wastewater Quality

Study of a New Photocatalytic Film Process Combined with a Constructed Wetland and an Analysis of Reoxygenation Pathways in a Water Body

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