A comparative study on the removal of nutrients and organic matter in wetland reactors employing organic media

Saeed, Tanveer; Sun, Guang–Zhen

doi:10.1016/j.cej.2011.03.101

Cited by 91 publications

(25 citation statements)

References 37 publications

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“…Most of these studies have focused on the comparison between either substrates or vegetation alone and have not compared the effects of substrates and vegetation as they act in unison [4,23,[31][32][33][34]. This study fills this gap and identifies the role that substrate and vegetation play in constructed wetland applications.…”

Section: Introductionmentioning

confidence: 87%

“…However, recent studies have shown that contribution to treatment of the overall system by these substrates has been limited. Therefore, alternative substrates have become more attractive and a number of studies have been conducted using alternative substrates in wetland applications [20][21][22][23]. These include natural, manufactured and reclaimed materials.…”

Section: Introductionmentioning

confidence: 99%

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Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Jin

Carlos

McConnell

et al. 2017

Water

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Abstract:With the recent development of constructed wetland technology, it has become a mainstream treatment technology for the mitigation of a variety of wastewaters. This study reports on the treatment performance and pH attenuation capacity of three different configurations of small-scale on-site surface flow constructed wetlands (SFCW): T1 (Peat + Typha latifolia), T2 (T. latifolia alone), and T3 (Peat alone) treating secondary effluent from the Amherstview Water Pollution Control Plant (WPCP) for two treatment periods (start-up period and operational period). The aim of this study was to compare the nutrients removal efficiencies between the different treatments, as well as to evaluate the effects of substrate and vegetation on the wetland system. For a hydraulic retention time of 2.5 days, the results showed that all treatment systems could attenuate the pH level during both the start-up and operational periods, while significant nutrient removal performance could only be observed during the operational period. Peat was noted to be a better SFCW substrate in promoting the removal of nitrate (NO 3 -N), total nitrogen (TN), and phosphorus. The addition of T. latifolia further enhanced NO 3 -N and TN removal efficiencies, but employing T. latifolia alone did not yield effluents that could meet the regulatory discharge limit (1.0 mg/L) for phosphorus.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Jin

Carlos

McConnell

et al. 2017

Water

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“…The high efficiency of constructed wetlands for removing organic matter and some nutrients such as N, P and K has been confirmed (Saeed & Sun, 2011;Ávila et al, 2013). However, studies are still incipient regarding the evaluation of CW for removal of organophosphate insecticides, such as chlorpyrifos.…”

Section: Introductionmentioning

confidence: 99%

Removal of chlorpyrifos insecticide in constructed wetlands with different plant species

Souza

Borges

Matos

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to evaluate the remediation of water containing the insecticide chlorpyrifos by using constructed wetlands (CW) cultivated with Polygonum punctatum, Cynodon spp. and Mentha aquatica, operated under different hydraulic retention times: 24, 48, 96, 144 and 192 h. The system efficiency was based on reduction of the initial concentration of chlorpyrifos and toxicity of the contaminated water. The results showed that constructed wetlands are an excellent alternative for remediation of the insecticide chlorpyrifos in aqueous medium. It was observed that the average overall removal efficiency of the insecticide was 98.6%, and in the first hydraulic retention time, 24 h, chlorpyrifos was removed to levels below the detection limit in all CW. This result is mainly attributed to adsorption and microbial degradation. For the qualitative standard acute toxicity tests with Daphnia similis, for most samples there was a reduction in toxicity greater than 80%. It was reported that the ecotoxicological tests with the effluents of the constructed wetland are a good option as an indicator of the effectiveness of treatments and a promising alternative to complement the physical and chemical analyses.Remoção do inseticida clorpirifós em sistemas alagados construídos cultivados com diferentes espécies vegetais R E S U M O Objetivou-se neste trabalho avaliar a remediação de água contendo o inseticida clorpirifós, por meio de sistemas alagados construídos (SAC) cultivados com as espécies Polygonum punctatum, Cynodon spp. e Mentha aquatica operados sob diferentes tempos de retenção hidráulica: 24, 48, 96, 144 e 192 h. A eficiência do sistema foi baseada na redução da concentração inicial do clorpirifós e toxicidade da água contaminada. Os resultados mostraram que os sistemas alagados construídos são uma excelente alternativa na biorremediação do inseticida clorpirifós no meio aquoso. Observou-se média geral de eficiência na remoção do inseticida de 98,6%, sendo que no primeiro tempo de retenção hidráulica, 24 h, houve remoção do clorpirifós para valores inferiores ao limite detecção para todos os SAC. Tal resultado é atribuído principalmente aos processos de adsorção e degradação microbiana. Para os ensaios padronizados qualitativos de toxicidade aguda com Daphnia similis, para a maioria das amostras observou-se a redução de toxicidade acima de 80%. Constatou-se que os testes ecotoxicológicos com os efluentes dos sistemas alagados construídos estudados são uma boa opção como indicativo da eficiência dos tratamentos e uma promissora alternativa na complementação de análises físicas e químicas.

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“…3 and 4, the release of organic matters from the fiber contributed to serve as the carbon source to derive denitrification. Many organic substrates have been proved to serve as the carbon source (Blowes et al, 1994;Wang et al, 2010;Saeed and Sun, 2011;Ruane et al, 2012).…”

Section: Type Of Nitrogenmentioning

confidence: 99%

“…However, contamination 69 wetlands, infiltration strips and biofilters have been widely used to treat different types of non-point source pollution (Vymazal, 2005;Aslan and Simsek, 2012;Adrados et al, 2014). Among them, vertical flow (VF) wetlands have many advantages such as low space requirement, good treatment, low cost, energy-effective, stable biofilm attachment, and natural oxygen supply by feeding, recirculation and discharge assuring active nitrification (Vymazal, 2007;Saeed and Sun, 2011;Borin et al, 2013;Zinger et al, 2013).…”

Section: Introduction 1)mentioning

confidence: 99%

Nitrogen Removal in Column Wetlands Packed with Synthetic Fiber Treating Piggery Stormwater

Cheng¹,

Kim²

2016

Journal of Wetlands Research

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prevention of piggery stormwater is of vital difficulty due to the dispersibility and uncertainty of the occurrence and the pollution source. Piggery stormwater has attracted more and more attention, since it contains high concentration of nutrients (e.g. nitrogen, phosphorus and organic matters), toxic substances (e.g. ammonia, nitrate and toxic organics) and risky pathogens and bacterial. It pollutes rivers and seas (Al-Hafedh et al., 2003;Mearns et al., 2013) AbstractA set of lab-scale polymer synthetic fiber packed column wetlands composing three columns (CW1, CW2 and CW3) with different hydraulic regimes, recirculation frequencies and pollutant loading rates, were operated in 2012. Synthetic fiber tested as an alternative wetland medium for soil mixture or gravel which has been widely used, has very high pore size and volume, so that clogging opportunity can be greatly avoided. The inflow to the wetland was artificial stormwater. All the wetlands achieved effective removal of TSS (94%~96%), TCOD (68%~73%), TN (35%~58%), TKN (62%~73%) and NH 4 -N (85%~ 99%). Particularly, it was observed that COD was released from the fiber during one distinct period in all wetlands. This was probably due to the degradation of polymer fiber, and the released organic matters were found to serve as carbon source for denitrification. In addition, with longer retention time and frequent recirculation, lower effluent concentration was observed. With higher pollutant loading rate, higher nitrification and denitrification rates were achieved. However, although organic matters were released from the fiber, the lack of carbon source was still the limiting factor for the system since the release persisted only for 40 days.

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A comparative study on the removal of nutrients and organic matter in wetland reactors employing organic media

Cited by 91 publications

References 37 publications

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Removal of chlorpyrifos insecticide in constructed wetlands with different plant species

Nitrogen Removal in Column Wetlands Packed with Synthetic Fiber Treating Piggery Stormwater

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