The configuration, purification effect and mechanism of intensified constructed wetland for wastewater treatment from the aspect of nitrogen removal: A review

Zhuang, Lin-Lan; Yang, Ting; Zhang, Jian; Li, Xiangzheng

doi:10.1016/j.biortech.2019.122086

Cited by 150 publications

(41 citation statements)

References 99 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, the main mechanism of elimination of N-NH 4 in CWs is the conversion to NO 3 - in aerobic conditions by Nitrosomonas and Nitrobacter [16,19]. Finally, the elimination NO 3 - in CWs takes place by the assimilation of plants in their tissues by absorption through the radical zone, but mainly through denitrification that is possible in anoxic/anaerobic conditions, where the nitric oxide (NO) is transformed to nitric oxide (N 2 O) and finally to nitrogen gas (N 2 ) [20,21,22]. The different mechanisms for transforming nitrogen in wetlands depend on the type of wetland.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Removal from Domestic Wastewater and the Development of Tropical Ornamental Plants in Partially Saturated Mesocosm-Scale Constructed Wetlands

Nakase

Zurita

Nani

et al. 2019

IJERPH

View full text Add to dashboard Cite

Vertical partially saturated (VPS) constructed wetlands (CWs) are a novel wastewater treatment system for which little information is known about its design parameters and performance under tropical climates. The objective of this study is to evaluate the nitrogen removal process from domestic wastewater and the production of tropical ornamental plants (Canna hybrids and Zantedeschia aethiopica) in VPS CWs at a mesocosms scale. Nine VPS CWs, with a free-flow zone of 16 cm and a saturated zone of 16 cm, were used as experimental units. Three units were planted with Canna hybrids., and three, with Zantedeschia aethiopica (one plant per unit); the remaining three units were established as controls without vegetation. They were fed with domestic wastewater intermittently and evaluated for the elimination of COD, N-NH 4 , N-NO 3 , Norg, NT, and PT. The results showed an increase in the removal for some pollutants in the vegetated systems, i.e., N-NH 4 (35%), Norg (16%), TN (25%), and TP (47%) in comparison to the unvegetated systems. While N-NO 3 removal showed better removal in 10% of the systems without vegetation, no significant differences were found (p > 0.05) for COD removal. The aerobic and anaerobic conditions in the VPS CWs favor the elimination of pollutants in the systems, and also the development of the tropical species evaluated in this study; good development was exhibited by a high growth rate and biomass production.

show abstract

Section: Introductionmentioning

confidence: 99%

Nitrogen Removal from Domestic Wastewater and the Development of Tropical Ornamental Plants in Partially Saturated Mesocosm-Scale Constructed Wetlands

Nakase

Zurita

Nani

et al. 2019

IJERPH

View full text Add to dashboard Cite

show abstract

“…After water sampling, three biological balls were tested from each reactor system for biofilm characteristic analysis. Since ammonia oxidation and nitrite conversion into nitric oxide are the rate-limiting steps of nitrification and denitrification, respectively, amoA and nirS genes, respectively, were measured [27].…”

Section: Sampling and Measurementmentioning

confidence: 99%

“…The influent water is simulated wastewater with typical constituents of COD, NH 4 + -N, NO 3 − -N, and micro-element. The response process included the SS-AE and SS-AN formation, disturbance and recovery under DO fluctuations in terms of (1) DO consumption, (2) NH 4 + -N and NO 3 − -N Res, and (3) activity of key N-cycle function genes amoA and nirS, which are the rate-limiting genes in the nitrification and denitrification process, the most important pathways of nitrogen transformation in BRs treating wastewater despite the complex microbial nitrogen-cycling network [14,27].…”

Section: Introductionmentioning

confidence: 99%

The Dynamic Response of Nitrogen Transformation to the Dissolved Oxygen Variations in the Simulated Biofilm Reactor

Zhang

Chen

et al. 2021

IJERPH

View full text Add to dashboard Cite

Lab-scale simulated biofilm reactors, including aerated reactors disturbed by short-term aeration interruption (AE-D) and non-aerated reactors disturbed by short-term aeration (AN-D), were established to study the stable-state (SS) formation and recovery after disturbance for nitrogen transformation in terms of dissolved oxygen (DO), removal efficiency (RE) of NH4+-N and NO3−-N and activity of key nitrogen-cycle functional genes amoA and nirS (RNA level abundance, per ball). SS formation and recovery of DO were completed in 0.56–7.75 h after transition between aeration (Ae) and aeration stop (As). In terms of pollutant REs, new temporary SS formation required 30.7–52.3 h after Ae and As interruptions, and seven-day Ae/As interruptions required 5.0% to 115.5% longer recovery times compared to one-day interruptions in AE-D and AN-D systems. According to amoA activity, 60.8 h were required in AE-D systems to establish new temporary SS after As interruptions, and RNA amoA copies (copy number/microliter) decreased 88.5%, while 287.2 h were required in AN-D systems, and RNA amoA copies (copy number/microliter) increased 36.4 times. For nirS activity, 75.2–85.8 h were required to establish new SSs after Ae and As interruptions. The results suggested that new temporary SS formation and recovery in terms of DO, pollutant REs and amoA and nirS gene activities could be modelled by logistic functions. It is concluded that temporary SS formation and recovery after Ae and As interruptions occurred at asynchronous rates in terms of DO, pollutant REs and amoA and nirS gene activities. Because of DO fluctuations, the quantitative relationship between gene activity and pollutant RE remains a challenge.

show abstract

“…The main contributors of algal blooms are nutrients, specifically nitrogen and phosphorus. Therefore, nutrient removal is one of the main research areas CWs have been investigated for Lin-Lan, Ting, Jian, & Xiangzheng, 2019). Wang, Lin, et al (2019) utilized an electrochemically assisted VFCW to remove high concentrations of phosphates and nitrates in the effluent of wastewater treatment plants while modified two VFCWs, one with recirculating VF and the other one was a single-pass two-stage VF.…”

Section: Wetlands For Nutrients Removalmentioning

confidence: 99%

Wetlands for environmental protection

Martinez‐Guerra

Ghimire

Nandimandalam

et al. 2020

Water Environment Research

View full text Add to dashboard Cite

This article presents an update on the research and practical demonstration of wetland-based treatment technologies for protecting water resources and environment covering papers published in 2019. Wetland applications in wastewater treatment, stormwater management, and removal of nutrients, metals, and emerging pollutants including pathogens are highlighted. A summary of studies focusing on the effects of vegetation, wetland design and operation strategies, and process configurations and modeling, for efficient treatment of various municipal and industrial wastewaters, is included. In addition, hybrid and innovative processes with wetlands as a platform treatment technology are presented.

show abstract

The configuration, purification effect and mechanism of intensified constructed wetland for wastewater treatment from the aspect of nitrogen removal: A review

Cited by 150 publications

References 99 publications

Nitrogen Removal from Domestic Wastewater and the Development of Tropical Ornamental Plants in Partially Saturated Mesocosm-Scale Constructed Wetlands

Nitrogen Removal from Domestic Wastewater and the Development of Tropical Ornamental Plants in Partially Saturated Mesocosm-Scale Constructed Wetlands

The Dynamic Response of Nitrogen Transformation to the Dissolved Oxygen Variations in the Simulated Biofilm Reactor

Wetlands for environmental protection

Contact Info

Product

Resources

About