Optimization of organics and nitrogen removal in intermittently aerated vertical flow constructed wetlands: Effects of aeration time and aeration rate

Wu, Haiming; Fan, Jiangwen; Zhang, Jian; Ngo, Huu Hao; Guo, Wenshan; Hu, Zhen; Lv, Jialong

doi:10.1016/j.ibiod.2016.04.031

Cited by 72 publications

(15 citation statements)

References 25 publications

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“… The population equivalent (PE) is calculated based on the common relation 1 PE = 60 g BOD d −1 . Biochemical oxygen demand (BOD) values were approximated using the ratio COD/BOD = 2 in the studies where BOD was not reported (Liu et al 2013 ; Fan et al 2013a , b ; H. Wu et al 2015b , 2016a ). (1) Tao et al ( 2010 ), (2) Dong et al ( 2012 ), (3) Liu et al ( 2013 ), (4) Fan et al ( 2013a ), (5) Fan et al ( 2013b ), (6) Foladori et al ( 2013 ), (7) Boog et al ( 2014 ), (8) H. Wu et al ( 2015b ), (9) Wang et al ( 2015 ), (10) H. Wu et al ( 2016a ) AA artificial aeration, VFCW vertical flow constructed wetland, WT wastewater type, D domestic, R river, S synthetic, HLR hydraulic loading rate, OLR organic loading rate, AM aeration mode, CA continuous aeration, IA intermittent aeration, AP aeration position, B bottom, M middle, S surface, AFR airflow rate, DO dissolved oxygen, TSSs total suspended solids, COD chemical oxygen demand, NH 4 + -N ammonium-nitrogen, TN total nitrogen, TP total phosphorus, NA not available …”

Section: Resultsmentioning

confidence: 99%

Intensification of constructed wetlands for land area reduction: a review

Ilyas

Masih

2017

Environ Sci Pollut Res

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The large land area requirement of constructed wetlands (CWs) is a major limitation of its application especially in densely populated and mountainous areas. This review paper provides insights on different strategies applied for the reduction of land area including stack design and intensification of CWs with different aeration methods. The impacts of different aeration methods on the performance and land area reduction were extensively and critically evaluated for nine wetland systems under three aeration strategies such as tidal flow (TF), effluent recirculation (ER), and artificial aeration (AA) applied on three types of CWs including vertical flow constructed wetland (VFCW), horizontal flow constructed wetland (HFCW), and hybrid constructed wetland (HCW). The area reduction and pollutant removal efficiency showed substantial variation among different types of CWs and aeration strategies. The ER-VFCW designated the smallest footprint of 1.1 ± 0.5 m2 PE−1 (population equivalent) followed by TF-VFCW with the footprint of 2.1 ± 1.8 m2 PE−1, and the large footprint was of AA-HFCW (7.8 ± 4.7 m2 PE−1). When footprint and removal efficiency both are the major indicators for the selection of wetland type, the best options for practical application could be TF-VFCW, ER-HCW, and AA-HCW. The data and results outlined in this review could be instructive for futures studies and practical applications of CWs for wastewater treatment, especially in land-limited regions.

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Section: Resultsmentioning

confidence: 99%

Intensification of constructed wetlands for land area reduction: a review

Ilyas

Masih

2017

Environ Sci Pollut Res

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“…The one-dimensional function of power disturbance is mapped to the two-dimensional function of time scale a and time shift b by continuous wavelet transform. The square integrable function y(t) is used for the continuous wavelet transform, the mother wavelet ψ(t) is obtained [23].…”

Section: Power Disturbance Signal Modelmentioning

confidence: 99%

Identification and detection algorithm of electric energy disturbance in microgrid based on wavelet analysis and neural network

Liu

Yang

2021

J Wireless Com Network

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In the presence of power disturbance, the test accuracy of power is not good, in order to improve the performance of power testing, it is necessary to carry out the power disturbance detection design. A power disturbance detection algorithm based on wavelet analysis and neural network is proposed. The time domain and frequency domain decomposition are used to decompose the characteristic of the power disturbance signal, and the wavelet analysis method is used to improve the adaptive focusing performance of the power disturbance signal. The one-dimensional power disturbance function is mapped to the two-dimensional function of time scale and time shift by continuous wavelet transform, and the higher-order spectral characteristic quantity of the power disturbance signal is extracted, and the extracted characteristic quantity is automatically classified by neural network. The optimal identification and detection of power disturbance are realized. The simulation results show that the algorithm has higher accuracy and higher recognition ability, which improves the accurate probability of power disturbance detection and the anti-disturbance ability of power test.

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“…Existem na literatura, trabalhos com resultados similares aos obtidos pela presente pesquisa. Alguns destes mostram, em alagados construídos de fluxo vertical com aeração intermitente, remoção de amônia à 98,4% (Wu et al, 2016a), 96,1% na eficiência de remoção por Fan et al (2016), assim como em 97,4% e 98,8% de eficiência em alagados construídos por Wu et al (2016).…”

Section: Remoção De Nitrogênio Amoniacalunclassified

Efeito de diferentes taxas de aeração na remoção de nitrogênio total e DQO em alagados construídos de fluxo subsuperficial horizontal aerados intermitentemente

Costa

Silva

Queluz

et al. 2019

RHE

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O objetivo do trabalho foi avaliar o efeito de diferentes taxas de aeração na remoção de demanda química de oxigênio (DQO) e nitrogênio total (NT) em alagados construídos de fluxo subsuperficial horizontal aerados intermitentemente. Foram estudados cinco alagados, sendo a dinâmica de aeração feita em 3 aerações diárias, com duração de uma hora cada, utilizando diferentes taxas de aeração: 0, 2, 5, 10, 20 L min-1. Os alagados receberam uma vazão de 8,7 L dia-1 de água residuária doméstica sintética, resultando em tempo de detenção de 3 dias. De cada alagado construído foram avaliados os seguintes parâmetros: DQO, oxigênio dissolvido, pH, NT, nitrato, nitrito, condutividade elétrica, temperatura e vazão. Após uma análise aprofundada dos resultados junto à estatística, foi possível determinar que a aeração tem papel fundamental na melhora da remoção de NT e DQO nos sistemas. Entretanto, as diferentes taxas de aeração neste caso, não se mostraram decisivas para tal feito, e sim estatisticamente suficientes para um desempenho bom e similar. Com respeito às eficiências dos parâmetros, a DBO é 3% superior nos alagados construídos com aeração intermitente quando comparados ao sem aeração, numa porcentagem média 97,5% a 98,24% de eficiência nos sistemas aerados. Já o NT teve uma eficiência 30% superior nos alagados com aeração, atingindo uma média de 80% a 83,6% de eficiência de remoção.

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Optimization of organics and nitrogen removal in intermittently aerated vertical flow constructed wetlands: Effects of aeration time and aeration rate

Cited by 72 publications

References 25 publications

Intensification of constructed wetlands for land area reduction: a review

Intensification of constructed wetlands for land area reduction: a review

Identification and detection algorithm of electric energy disturbance in microgrid based on wavelet analysis and neural network

Efeito de diferentes taxas de aeração na remoção de nitrogênio total e DQO em alagados construídos de fluxo subsuperficial horizontal aerados intermitentemente

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