Understanding wastewater treatment mechanisms: a review on detection, removal, and purification efficiencies of faecal bacteria indicators across constructed wetlands

Donde, Oscar Omondi; Xiao, Baihua

doi:10.1139/er-2017-0017

Cited by 20 publications

(7 citation statements)

References 120 publications

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“…This (the combined loss of water by evaporation from the water surface and loss through transpiration by plants) and the density of the vegetation of a wetland strongly affect the constructed wetlands' hydrology. This can be experienced through the obstruction of water flow paths as the water finds its sinuous way through the network of stems, leaves, roots, and rhizomes, and it can also occur through the blockage of exposure to wind and sun [7,24,25]. Water always acts as a vehicle for delivering the pollutants to the system and also for discharging the untapped pollutants away from the system [24].…”

Section: Watermentioning

confidence: 99%

Constructed Wetlands in Wastewater Treatment and Challenges of Emerging Resistant Genes Filtration and Reloading

Omondi¹,

Navalia²

2021

Inland Waters - Dynamics and Ecology

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A wetland is a unique and distinct ecosystem that is flooded by water, either permanently or seasonally, where oxygen-free processes prevail, and the primary distinctive factor of wetlands from other landforms or water bodies is the occurrence of adaptive vegetation of aquatic plants, characteristic to the unique hydric soil. A constructed wetland is an artificial shallow basin filled with substrate, usually soil or gravel, and planted with vegetation that has tolerance to saturated conditions. As much as the use of constructed wetland has been recommended in the treatment of various forms of wastewater, the system efficiency is a factor of very many natural and artificial factors, with the emerging pollutants and contaminants such as resistant genes being the most complicated contaminants to eliminate through the system. Indeed, the emerging pollutants in forms of antibiotic resistant genes (ARGs) have remained prevalent in aquatic environments such as wetlands that receive ARG-loaded sewage. Therefore, this chapter covers a discussion on constructed wetlands in wastewater treatment and challenges of emerging contaminants, such as resistant genes filtration and reloading mechanisms, and provides recommendation for the proper handling and removal of such pollutants from the wetlands' functional system.

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Section: Watermentioning

confidence: 99%

Constructed Wetlands in Wastewater Treatment and Challenges of Emerging Resistant Genes Filtration and Reloading

Omondi¹,

Navalia²

2021

Inland Waters - Dynamics and Ecology

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“…Using the combination of in situ microbial activity detection and sequencing omics to study the similarity of abundant active microorganisms in the environment, community structure, functional metabolism and environmental response, is more and more popular. These technologies include methods mainly based on DNA levels, RNA levels,protein levels, such as fluorescence in situ hybridization (FISH), and real-time quantitative PCR (qPCR), amplicon sequencing, enzymatic assays (Donde and Xiao, 2017a).…”

Section: In Situ Detection And/or Counting Of Microbial Organisms or mentioning

confidence: 99%

“…Fluorescence in situ hybridization (FISH) technique uses an oligonucleotides probe with fluorescent tag to bind with DNA specifically. There are many successful application cases using FISH, and catalyzed reporter deposition-FISH (CARD-FISH) has established to further improve the technology in application (Chen et al, 2017a;Donde and Xiao, 2017a (Icgen and Yilmaz, 2017).…”

Section: Detection and Counting By Fluorescence In Situ Hybridizationmentioning

confidence: 99%

See 1 more Smart Citation

Molecular biological methods in environmental engineering

Pulin²,

Wei³

et al. 2018

Water Environment Research

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Environmental bioremediation technologies are undoubtedly more economical and environmental friendly, and present a good application prospect. Microorganisms can be used to monitor environmental changes for their quickly respond to environmental changes. Microbiological molecular biology methods have attracted more and more attention from human beings, and their applications in the environment is also expanding. Genomics, transcriptomics, proteomics, and metabolomics are four major molecular biology techniques. This review summarizes application of molecular biological methods in environmental engineering in 2017. The summary includes methods for DNA, RNA, and protein extraction, the application of four major technologies in the environmental field, and commonly used methods for in situ monitoring in the environment, including fluorescence in situ hybridization, real-time quantitative PCR, and amplicons sequencing technology.

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“…Constructed wetlands (CWs) have been widely used in many countries and regions in the last few decades, owing to their advantages of high efficiency, appropriate ecological environment, low cost and aesthetic value [1][2][3][4][5]. Moreover, the important role of CWs as a wildlife habitat and greenspace make them an appropriate alternative to conventional wastewater treatment, mainly in isolated small communities [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aeration Modes and COD/N Ratios on Organic Matter and Nitrogen Removal in Horizontal Subsurface Flow Constructed Wetland Mesocosms

Chen

Zhu

et al. 2018

Water

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A series of mesocosm-scale horizontal subsurface flow constructed wetlands (HSSF-CWs) were established. In Experiment 1, four artificial aeration (AA) modes, including pre-aeration at 24 h before the input of influent water (PA), aeration at 6 h (6AA) and 12 h (12AA) after the input of influent water and non-aeration (NA), were tested to obtain an optimal aeration mode for chemical oxygen demand (CODCr) and nitrogen removal. The results showed that aeration after the input of influent water could improve the removal efficiencies of CODCr and ammonia-nitrogen (NH4⁺-N), but lead to an accumulation of nitrate-nitrogen (NO3−-N). The above observation demonstrated that a single aeration cannot create an ideal alternation of aerobic and anaerobic conditions for simultaneous nitrification and denitrification. Therefore, HSSF-CWs with intermittent aeration (IA), after the input of influent water and NA were established to evaluate the combined effects of IA and influent COD/N ratios on pollutant removal in Experiment 2. The HSSF-CW with IA exhibited a better performance in CODCr and nitrogen removal compared to HSSF-CW with NA. The highest removal percentages of CODCr (90.1%), NH4+-N (99.8%) and total nitrogen (TN, 99.5%) were achieved at a COD/N ratio of 9.3 in HSSF-CW with IA.

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Understanding wastewater treatment mechanisms: a review on detection, removal, and purification efficiencies of faecal bacteria indicators across constructed wetlands

Cited by 20 publications

References 120 publications

Constructed Wetlands in Wastewater Treatment and Challenges of Emerging Resistant Genes Filtration and Reloading

Constructed Wetlands in Wastewater Treatment and Challenges of Emerging Resistant Genes Filtration and Reloading

Molecular biological methods in environmental engineering

Effect of Aeration Modes and COD/N Ratios on Organic Matter and Nitrogen Removal in Horizontal Subsurface Flow Constructed Wetland Mesocosms

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