Can subsurface flow constructed wetlands be applied in cold climate regions? A review of the current knowledge

Zhao, Yaqian; Vymazal, Jan; Qiao, Shangxiao; Wei, Ting; Li, Jie; Mander, Ülo

doi:10.1016/j.ecoleng.2020.105992

Cited by 40 publications

(8 citation statements)

References 94 publications

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“…When winter arrives, the low temperature will affect the nitrification and denitrification processes in the wetland, which will, in turn, affect the removal rate of nitrogen from the effluent. In winter, when plants are in a dormant phase, they release less oxygen [115]. Adsorption is a temperature-dependent process: the lower the temperature, the poorer the substrate's adsorption capacity.…”

Section: Engineering Issuesmentioning

confidence: 99%

“…Adsorption is a temperature-dependent process: the lower the temperature, the poorer the substrate's adsorption capacity. Some options, such as the planting of cold-resistant plants, substrate selection, aeration, and the use of insulation measures (covering with insulation film) to produce a greenhouse-like environment, are regarded as effective solutions [115].…”

Section: Engineering Issuesmentioning

confidence: 99%

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Towards Effective, Sustainable Solution for Hospital Wastewater Treatment to Cope with the Post-Pandemic Era

Liu

Zhao

Cai

et al. 2023

IJERPH

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Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) has spread across the globe since the end of 2019, posing significant challenges for global medical facilities and human health. Treatment of hospital wastewater is vitally important under this special circumstance. However, there is a shortage of studies on the sustainable wastewater treatment processes utilized by hospitals. Based on a review of the research trends regarding hospital wastewater treatment in the past three years of the COVID-19 outbreak, this review overviews the existing hospital wastewater treatment processes. It is clear that activated sludge processes (ASPs) and the use of membrane bioreactors (MBRs) are the major and effective treatment techniques applied to hospital wastewater. Advanced technology (such as Fenton oxidation, electrocoagulation, etc.) has also achieved good results, but the use of such technology remains small scale for the moment and poses some side effects, including increased cost. More interestingly, this review reveals the increased use of constructed wetlands (CWs) as an eco-solution for hospital wastewater treatment and then focuses in slightly more detail on examining the roles and mechanisms of CWs’ components with respect to purifying hospital wastewater and compares their removal efficiency with other treatment processes. It is believed that a multi-stage CW system with various intensifications or CWs incorporated with other treatment processes constitute an effective, sustainable solution for hospital wastewater treatment in order to cope with the post-pandemic era.

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Section: Engineering Issuesmentioning

confidence: 99%

Section: Engineering Issuesmentioning

confidence: 99%

Towards Effective, Sustainable Solution for Hospital Wastewater Treatment to Cope with the Post-Pandemic Era

Liu

Zhao

Cai

et al. 2023

IJERPH

Self Cite

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“…Hydraulic modeling software such as QUAL2K and HEC-RAS were used to review hydraulic design and water quality parameters, in which pollutant removal percentages were obtained from the study, they were low compared to other geographical areas, especially in the analysis of TN, obtaining 13.59% and 25.64% with the simulations in the mentioned software. The low levels of efficiency obtained in the models may be due to the fact that the type of climate in the area causes low bacterial activity, reducing the efficiency of the system [67].…”

Section: North Americamentioning

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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“…Subsequently, dry phases create passively aerated aerobic conditions when lowering the water table drains the wetland and allows atmospheric air into the bed matrix. TFCWs have been achieving over 80% removal of TN operating effectively even in cold climates and under low carbon/nitrogen (C/N) conditions due to anammox microbial community that perform a low carbon nitrogen removal pathway (Hu et al, 2014;Pang et al, 2015;Ji et al, 2020). TFCWs are found to be less vulnerable to bioclogging due to the shear stress of the fluctuating water table that contains the growth of biofilm (Zhuang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen removal performance and bacterial community analysis of a multistage step-feeding tidal flow constructed wetland

et al. 2023

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A multistage mesocosm vertical flow constructed wetland system was designed to treat synthetic domestic wastewater with a high nitrogen (N) load. The study aim was to determine the impact of design and operational variables on N removal efficiency in such systems. A tidal flow operational strategy enhanced aeration and was coupled with a step-feeding approach to promote N removal. Over the 420-day running period N removal rates were between 70 and 77 gN/m3/d, for a step-feeding ratio range of 60:40 to 80:20. The system was able to remove 91–95% of chemical oxygen demand, 74–91% of ammonium and 66–81% of total-N. Tidal flow and step-feeding strategies significantly impacted nitrogen removal with the best performance at a step-feeding ratio of 80:20 providing a carbon to nitrogen (COD/N) ratio of 4–5. The bacterial diversity increased at each stage throughout the system with dominating phyla Proteobacteria, Firmicutes, Planctomycetes, Bacteroidetes, Chloroflexi, Verrucomicrobia and Acidobacteria. Dominant bacteria at the genus level were Thiothrix, Planctomyces, Azonexus, Pseudoxanthomonas, Hydrogenophaga, Gemmobacter and other genera suggesting that N removal was accomplished via diverse metabolic pathways, including autotrophic nitrification, heterotrophic denitrification, autotrophic denitrification, and possibly anammox. This study shows benefits of step-feeding strategies in tidal flow constructed wetlands as a cost-effective solution for minimizing external carbon input to achieve effective N removal.

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Can subsurface flow constructed wetlands be applied in cold climate regions? A review of the current knowledge

Cited by 40 publications

References 94 publications

Towards Effective, Sustainable Solution for Hospital Wastewater Treatment to Cope with the Post-Pandemic Era

Towards Effective, Sustainable Solution for Hospital Wastewater Treatment to Cope with the Post-Pandemic Era

Technological Innovations in the Application of Constructed Wetlands: A Review

Nitrogen removal performance and bacterial community analysis of a multistage step-feeding tidal flow constructed wetland

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