Impact of design and operation variables on the performance of vertical-flow constructed wetlands and intermittent sand filters treating pond effluent

Torrens, Adelaida Ferrer; Molle, Pascal; Boutin, Catherine; Salgot, Miquel

doi:10.1016/j.watres.2009.01.023

Cited by 107 publications

(66 citation statements)

References 21 publications

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“…Two-way ANOVA reveals that there is a significant difference on the efficiency of slow sand filter to reduce turbidity in raw water among the three different sand filter depths (p<0.05). Efficiency of reducing turbidity in filtrate was higher using sand filter of 0.90 m and 0.60 m depth than in 0.30 m. The findings of Torrens et al (2009) revealed that the deeper filters presented better removals of contaminants due to higher hydraulic detention times. However, there is no significant difference on the efficiency of slow sand filter to reduce turbidity in raw water among the three flow-through rates.…”

Section: Turbidity Reductionmentioning

confidence: 85%

Efficiency of Slow Sand Filter in Purifying Well Water

Bagundol

Awa

Rosellynn

et al. 2013

JMDS

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Slow sand filter can be effective for water purification. The formation of "schmutzdecke" on the surface of the sand bed can vary the efficiency of slow sand filter. This study aimed to investigate the efficiency of slow sand filter in purifying well water using Labo River sand as the filter medium. Bacteriological analysis and turbidity tests were done on water samples from deep and shallow well before and after filtration at 0.30 m, 0.60 m and 0.90 m filter depths and at 200 L/hr.m 2 , 300 L/hr.m 2 and 400 L/hr.m 2 flow-through rates. Percent removal of E. coli varied and efficiency was generally high at different depths and flowthrough rates. However, E. coli removal in different filter depths and flowthrough rates was not significant (p<0.05). Percent efficiency in reducing turbidity varied. Efficiency was increasing at increasing depths and flow-through rates. There was a significant difference on the efficiency to reduce turbidity among different sand filter depths (p<0.05). However, there was no significant difference on the efficiency to reduce turbidity among the three flow-through rates. A significant interaction between filter depth and the flow-through rate in the removal of E. coli (p<0.05) was observed which means that increasing the depth of the sand filter while slowing the filtration rate improved efficiency in E. coli removal of the raw water. Most of the bacteria and particle removal is ascribed to schmutzdecke development. This study can help address the water problem particularly in local communities that depend greatly on well water for drinking.

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Section: Turbidity Reductionmentioning

confidence: 85%

Efficiency of Slow Sand Filter in Purifying Well Water

Bagundol

Awa

Rosellynn

et al. 2013

JMDS

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“…Torrens et al [7] destacam que a falta do cumprimento com as recomendações de alimentação e períodos de repouso (3-4 dias de alimentação / 7 dias de repouso) para as condições climáticas da França aumentam o acúmulo de uma camada de lodo na superfície, trazendo problemas de entupimento na camada superior, fato não observado quando os critérios recomendados de operação são respeitados.…”

Section: Resultados E Discussõesunclassified

“…Como forma de obter resultados satisfatórios que refletem na durabilidade e confiabilidade ao longo do tempo de operação, Torrens et al [7] reforçam a necessidade de controlar os períodos de alimentação e repouso, conforme proposto em projeto.…”

Section: Introductionunclassified

Comportamento diário ao longo do período de alimentação do primeiro estágio do sistema francês de wetland vertical, em termos de remoção de matéria orgânica e amônia

2018

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____________________________________________________________________________________________________________ RESUMOO objetivo desse trabalho foi avaliar o comportamento do potencial de nitrificação e remoção de matéria orgânica no primeiro estágio de um wetland construído vertical -sistema francês (WCV-SF), operando com dois leitos em paralelo, cada um com 7 dias de alimentação e 7 dias de repouso, sob condições climáticas brasileiras. A estação de tratamento avaliada está localizada no Centro de Pesquisa e Treinamento em Saneamento (CePTS) da Universidade Federal de Minas Gerais e Companhia de Saneamento de Minas Gerais, UFMG/COPASA, na cidade de Belo Horizonte, Brasil. Complementando o monitoramento rotineiro praticado há anos neste sistema, efetuou-se um monitoramento intensivo da qualidade do afluente e do efluente do WCV-SF durante uma semana, por meio de análises físico-químicas, através de coletas simples diárias nos tempos de 5, 10, 15, 20, 30, 40 e 50 minutos depois do início de uma batelada. Durante o período de monitoramento foi possível observar a eficiência dessa etapa associada à decomposição da matéria orgânica, permanecendo satisfatória mesmo em períodos de sobrecarga. Com concentrações positivas de oxigênio no efluente, o desempenho do sistema ao longo dos 7 dias de alimentação apresentou eficiência média de remoção e 69% para DQO. Em termos de nitrogênio, a eficiência de remoção de N-NH4 + foi de 58% e a produção de N-NO3 -diminuiu com o avanço dos dias de alimentação, reportando 20 mg L -1 no 2º dia e 11 mg L -1 no último. De uma forma geral, apesar de ter apenas duas unidades em paralelo, o sistema mostrou boa capacidade de receber esgoto bruto por um período de tempo maior de alimentação, reforçando os resultados obtidos no monitoramento rotineiro.Palavras-chave: Esgoto bruto. Esgoto sanitário. Estratégias operacionais. Tratamento de esgotos.

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“…The tracer content and the flow rate at the outlet of the SWISs were recorded each minute. This monitoring allowed to determine the detention time distribution (DTD), DTD = E(t), and the mean hydraulic retention time (HRT) (Torrens et al 2009). The HRT is determined as follows:…”

Section: Hydraulic Retention Timementioning

confidence: 99%

Characteristics of subsurface wastewater infiltration systems fed with dissolved or particulate organic matter

Pan

2013

Int. J. Environ. Sci. Technol.

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The influent type of organic matter (dissolved or particulate) on the characteristics of two subsurface wastewater infiltration systems (SWISs) was investigated. One of the SWISs was fed with dissolved organic matter (glucose, assumed to be readily biodegradable) and the other with particulate organic matter (starch, assumed to be slowly biodegradable). Results showed that both biofilm growth and particle accumulation in substrate could reduce the effective porosity and infiltration rate of SWIS, especially for the high organic matter concentration wastewater. The reduction in effective porosity and infiltration rate was primarily caused by organic particle accumulation. The contribution of the accumulated organic particle to the process of clogging was greater than that of biofilm growth and the clogging mainly occurred in the upper layer in starch-fed systems. The SWISs fed with glucose were not clogged till the end of experiments. The hydraulic retention time (HRT) increased with time in start-up period and was almost invariable after mature in glucose-fed systems; in starch-fed systems, clogging of substrate prolonged the HRT. The two identical experimental SWISs were almost equal efficiencies for the removal of chemical oxygen demand (COD). The removal efficiencies of COD were not influenced by clogging under the experimental conditions. Ammonia N removal efficiency was higher in glucose-fed systems than that in starch-fed systems.

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Impact of design and operation variables on the performance of vertical-flow constructed wetlands and intermittent sand filters treating pond effluent

Cited by 107 publications

References 21 publications

Efficiency of Slow Sand Filter in Purifying Well Water

Efficiency of Slow Sand Filter in Purifying Well Water

Comportamento diário ao longo do período de alimentação do primeiro estágio do sistema francês de wetland vertical, em termos de remoção de matéria orgânica e amônia

Characteristics of subsurface wastewater infiltration systems fed with dissolved or particulate organic matter

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