A study of the bacteriological quality of roof-harvested rainwater and an evaluation of SODIS as a suitable treatment technology in rural Sub-Saharan Africa

Nalwanga, Rosemary; Muyanja, Charles; McGuigan, Kevin G.; Quilty, Bríd

doi:10.1016/j.jece.2016.12.008

Cited by 24 publications

(24 citation statements)

References 32 publications

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“…The protocol involves exposing water in UV-visible transparent containers to direct sunlight for a minimum of 6 h (48 h in cloudy conditions). Nalwanga et al (2018) investigated the use of SODIS with 2 L polyethylene-terephthalate (PET) bottles for the treatment of harvested rainwater in Uganda. While the viable counts of Escherichia coli and faecal enterococci exceeded drinking water standards in the majority of the untreated samples analysed, culture-based analysis indicated that after SODIS, the concentrations of these bacteria were significantly reduced (detailed information on counts not presented) (Nalwanga et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Nalwanga et al (2018) investigated the use of SODIS with 2 L polyethylene-terephthalate (PET) bottles for the treatment of harvested rainwater in Uganda. While the viable counts of Escherichia coli and faecal enterococci exceeded drinking water standards in the majority of the untreated samples analysed, culture-based analysis indicated that after SODIS, the concentrations of these bacteria were significantly reduced (detailed information on counts not presented) (Nalwanga et al, 2018). The major limitations associated with the use of a simple SODIS system are, however, the small volume of treated water generated (1 to 5 L) and the treatment time required for sufficient disinfection of the water.…”

Section: Introductionmentioning

confidence: 99%

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Predatory bacteria in combination with solar disinfection and solar photocatalysis for the treatment of rainwater

et al. 2020

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The predatory bacterium, Bdellovibrio bacteriovorus, was applied as a biological pre-treatment to solar disinfection and solar photocatalytic disinfection for rainwater treatment. The photocatalyst used was immobilised titanium-dioxide reduced graphene oxide. The pre-treatment followed by solar photocatalysis for 120 min under natural sunlight reduced the viable counts of Klebsiella pneumoniae from 2.00 × 10 9 colony forming units (CFU)/mL to below the detection limit (BDL) (<1 CFU/100 µL). Correspondingly, ethidium monoazide bromide quantitative PCR analysis indicated a high total log reduction in K. pneumoniae gene copies (GC)/mL (5.85 logs after solar photocatalysis for 240 min). In contrast, solar disinfection and solar photocatalysis without the biological pre-treatment were more effective for Enterococcus faecium disinfection as the viable counts of E. faecium were reduced by 8.00 logs (from 1.00 × 10 8 CFU/mL to BDL) and the gene copies were reduced by ~3.39 logs (from 2.09 × 10 6 GC/mL to ~9.00 × 10 2 GC/mL) after 240 min of treatment. Predatory bacteria can be applied as a pre-treatment to solar disinfection and solar photocatalytic treatment to enhance the removal efficiency of Gram-negative bacteria, which is crucial for the development of a targeted water treatment approach.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predatory bacteria in combination with solar disinfection and solar photocatalysis for the treatment of rainwater

et al. 2020

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“…The most significant environmental impact is the spatiotemporal migration of pollutants in rainwater during social activities [14][15][16], especially that of air pollutants [17][18][19]. However, there are clear regional differences in the features of roof rainwater runoff pollution [20][21][22]. The rainwater runoff pollution of a region should be characterized accurately in the light of regional conditions, rather than generalized from the features in other regions [23].…”

Section: Introductionmentioning

confidence: 99%

Features of Roof Rainwater Runoff Pollution in a Northern Coastal City under the Effects of Multiple Factors

Zhang¹,

Liu²,

Zheng³

et al. 2020

IJSDP

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This paper attempts to disclose the features of roof rainwater runoff pollution under the effects of air pollution, season, rainfall intensity, and antecedent dry period. Targeting an inclined tile roof in Yantai, China, this paper samples rainwater multiple times from March to November, 2018. The quality of roof rainwater samples in 12 representative natural rainfalls was monitored, and the curves of the main pollutants in these samples were plotted. On this basis, the authors analyzed the change features and outflow laws of the main pollution indices of roof runoff rainwater under the effects of different factors. The results show that: The degree of air pollution directly bears on rainwater quality. The rainfall also has a certain impact on air pollution indices. Season is the leading influencing factor of the quality of roof runoff rainwater. The best rainwater quality was observed in autumn, followed by that in spring and then that in summer. In the first 10-20min of each rainfall, the pollutant contents decreased at a growing rate with the increase of rainfall intensity. The increments of the initial pollutant contents reached the maximum at the antecedent dry period of 10d. The changes of all pollution indices of roof runoff rainwater could be divided into the sudden change phase, the transition phase, and the stable phase. Roof rainwater runoff has an obvious initial washing effect, and exerts a secondary washing effect. The research results provide a good reference for northern coastal cities to rationalize the parameters of rainwater purification facilities.

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“…Dispor de água limpa é um direito essencial do ser humano, necessário para sua sobrevivência e para o progresso da população (TERÊNCIO et al, 2018). A falta de água potável é responsável por 80% das enfermidades ocorrentes em países pobres, como por exemplo, o Quênia, Índia, Uganda, Bangladesh, Paquistão, Nepal, Butão, Siri Lanka e Bolívia (FUENTES-GALVÁN et al, 2018;KEOGH et al, 2017;MAHMOOD et al, 2017;QUAGHEBEUR et al, 2019), sendo a disenteria, a febre tifoide e a cólera as doenças de maior prevalência (CLARK et al, 2019;GÓMEZ-COUSO et al, 2012;LAWRIE et al, 2015;MAHMOOD et al, 2017;NALWANGA et al, 2018). No Brasil esta realidade não é diferente, sendo as populações rurais e urbanas de baixa renda as mais afetadas, das quais as comunidades ribeirinhas amazônicas estão entre as mais marginalizadas.…”

Section: Introductionunclassified

Avaliação da qualidade das Águas da Baia do Guajará para consumo humano

Costa

Benjamim

Neto

et al. 2020

RICA

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A população ribeirinha da ilha de Jutuba, pertencente ao município de Belém, não possui abastecimento público de água, sendo obrigada a recorrer ao consumo das águas da Baia do Guajará, bacia que banha a ilha, porém que recebe diariamente o despejo in natura do esgoto da cidade. Nesta perspectiva, o objetivo deste trabalho é avaliar a qualidade da água da Baia do Guajará utilizada para o consumo humano pela população ribeirinha da Ilha de Jutuba. Foram avaliadas as variáveis: cor aparente, turbidez, potencial hidrogeniônico, alcalinidade, sólidos dissolvidos totais , condutividade elétrica, dureza total, coliformes totais e Escherichia coli. As análises das amostras demonstraram que somente as variáveis sólidos totais dissolvidos, dureza total e pH apresentaram valores apropriados para ingestão, enquanto a cor aparente, turbidez, coliformes totais e Escherichia coli inadequados aos limites de potabilidade nacional.

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A study of the bacteriological quality of roof-harvested rainwater and an evaluation of SODIS as a suitable treatment technology in rural Sub-Saharan Africa

Cited by 24 publications

References 32 publications

Predatory bacteria in combination with solar disinfection and solar photocatalysis for the treatment of rainwater

Predatory bacteria in combination with solar disinfection and solar photocatalysis for the treatment of rainwater

Features of Roof Rainwater Runoff Pollution in a Northern Coastal City under the Effects of Multiple Factors

Avaliação da qualidade das Águas da Baia do Guajará para consumo humano

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