Degradation of DBPs' precursors in river water before and after slow sand filtration by photo-Fenton process at pH 5 in a solar CPC reactor

Moncayo-Lasso, Alejandro; Pulgarín, C.; Benítez, Norberto

doi:10.1016/j.watres.2008.07.014

Cited by 64 publications

(31 citation statements)

References 39 publications

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“…which shows the slightly higher peaks for DBCM, and BDCM in comparison with CHCL 3 and BF. Interestingly, the overall removal efficiencies achieved was found to be greatest for CHCL 3 and least for BF. This is attributed to the volatility of THMs [81], where CHCL 3 with vapour pressure of 26.3 kPa could more easily escape and react with the gaseous reactive species than BF at a vapour pressure of 0.6 kPa.…”

Section: Thm Degradation Study and Dbp Reduction Potentialmentioning

confidence: 98%

“…Nitrates formed under acidic conditions undergo several reactions to form peroxynitrite acid [72]. Lukes et al [73] reported that the oxidative ability of reactive nitrogen species is lower than reactive oxygen species as they are formed by consuming the stronger oxidant ÁOH which in turn converts to HNO 3 . Plasma discharges to water also generates H 2 O 2 [72,74].…”

Section: Role Of Active Speciesmentioning

confidence: 99%

“…DBPs, including trihalomethanes, can be formed as a consequence of the reaction of chlorine with natural organic matter (NOM) present in both surface and ground water [2]. NOM comprises of two fractions; humic substances (HS), which are composed of humic acids, fulvic acids, and non-humic substances (non-HS), which include carbohydrates, lipids, and amino acids [3]. Furthermore, humic acids constitute a major fraction of NOM, of which the soluble portion (aromatic compounds) of humic substances may react with chlorine to form trihalomethanes [4].…”

Section: Introductionmentioning

confidence: 99%

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Humic acid and trihalomethane breakdown with potential by-product formations for atmospheric air plasma water treatment

Sarangapani¹,

Lü²,

Behan³

et al. 2018

Journal of Industrial and Engineering Chemistry

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A B S T R A C TIn this study an atmospheric air plasma reactor was studied for the degradation of HA and THMs in water. Plasma treatment showed significant breakdown efficacies for HA and THMs. At an applied voltage of 80 kV about 93% of HA and >70% of THMs were degraded after 15 min and 30 min treatment time respectively, with the degradation following a first order kinetic model. Plasma induced reactive species including nitrates and H 2 O 2 were quantified in the treated water. The results of FTIR analysis revealed that the molecular structure of HA was altered by the plasma treatment, with a decrease in aromaticity observed.

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Section: Thm Degradation Study and Dbp Reduction Potentialmentioning

confidence: 98%

Section: Role Of Active Speciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Humic acid and trihalomethane breakdown with potential by-product formations for atmospheric air plasma water treatment

Sarangapani¹,

Lü²,

Behan³

et al. 2018

Journal of Industrial and Engineering Chemistry

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“…Além disso, o aumento do pH favorece a formação de hidróxidos de ferro, os quais são insolúveis em água, o que paralisa a reação de Fenton. Todavia, encontram-se na literatura trabalhos (MONCAYO-LASSO et al, 2008;ZEPP et al, 1992) que objetivam investigar faixas de pH acima de 3, como forma de aperfeiçoar esta tecnologia. Esta possibilidade decorre da geração de íons H + durante a reação (Equações 2 e 5), permitindo uma redução do pH.…”

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Prospecção Tecnológica Da Aplicação De Tratamento Eletroquímico E Reação De Fenton Na Remediação De Água De Produção De Biodiesel

Araújo

Soletti

Zanta

et al. 2017

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<p>Visando promover um mapeamento dos trabalhos relacionados ao uso de processos eletroquímicos e/ou da reação de Fenton na remediação de efluentes da produção de biocombustíveis, utilizou-se bancos de patentes (INPI, Derwent Innovations Index, WIPO, Espacenet e Lens) e de artigos (Periódicos), de forma a elucidar as tendências científicas e tecnológicas impostas a estas fontes alternativas de energia. Identificou-se a liderança de EUA e China tanto na produção científica quanto patentária no tema. Países como Brasil, Tailândia, Coreia do Sul e Colômbia foram identificados como bons desenvolvedores científicos, apesar da modesta produção tecnológica. Não foram encontradas citações de trabalhos ou patentes que agregassem simultaneamente a produção de biodiesel e o tratamento por meio de reação de Fenton e pela via eletro-oxidação. A maior parte das patentes identificadas com o tema está classificada com os códigos C02F, C12P, C10L e B01D.</p>

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“…Hydrophobic and high MW fractions of NOM are preferably decomposed by AOPs, and as a result, after the treatments more hydrophilic and low MW fractions are produced (Bazri et al, 2012;Liu et al, 2008;Park and Yoon, 2007;Sanly et al, 2007), which are less reactive with OH radicals and thus not mineralized completely (Sanly et al, 2007). Many studies have reported that AOPs could significantly reduce the SUVA 254 of treated water (Liu et al, 2008;Moncayo-Lasso et al, 2008;Sanly et al, 2007), and therefore 50-90% of THM and HAA precursors could be removed (Liu et al, 2008;Moncayo-Lasso et al, 2012;Park and Yoon, 2007).…”

Section: Advanced Oxidation Processes (Aops)mentioning

confidence: 99%

Novel chemical and biological pre-treatments to improve water quality in drinking water treatment

Liu¹

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Natural organic matter (NOM) is ubiquitous in surface water and the reactions between NOM and free chlorine can generate undesired disinfection by-products (DBPs). Therefore, an adequate degree of NOM removal is important for drinking water treatment plants (WTPs). Recently, the long-established approach of biofiltration applied as pre-treatment, including riverbank filtration (RBF) and slow sand filtration (SSL), has attracted attention for its relatively low cost and reliable performance in improving the quality of surface waters. Thus, the overall aim of this thesis is to gain in-depth understanding of NOM and DBP precursors removal during the biofiltration process and to develop approaches to improve the performance of the biofiltration.Firstly, a novel enhanced zero valent iron (ZVI) process that employs granular activated carbon as interspersed cathodes was evaluated as a pre-treatment step in drinking water production to remove NOM. Lab-scale batch tests indicated that, in the GAC enhanced-ZVI process, dissolved organic carbon (DOC) and ultraviolet absorbance at 254 nm (UV 254 ) were reduced by 61±3% and 70±2%, respectively, during 24 h treatment corresponding to 1.8 minutes empty bed contact time (EBCT).This process was superior to ZVI alone, GAC alone, and the sum of ZVI alone and GAC alone, confirming the synergic mechanism leading to increased iron dissolution rate. The dominant mechanism in terms of NOM removal during enhanced-ZVI was found to be coagulation following iron dissolution, while oxidation was occurring to a lesser degree, converting some nonbiodegradable into biodegradable DOC (BDOC). Therefore, the enhanced-ZVI process has the potential to improve biodegradation in a subsequent biofiltration step.Then, the long-term performance of the enhanced-ZVI process and its synergy with the subsequent biofiltration were investigated. Lab-scale flow-through experiments showed that, after 10,000-bed volumes, the enhanced-ZVI bed became passivated. However, sulphuric acid was able to regenerate the passivated enhanced-ZVI bed, recover the capacity of enhanced-ZVI in removing NOM, and hence make the best use of the available ZVI. The acidic rinsing solution containing dissolved iron was suitable as a supplemental source of iron for coagulation. In addition, during the long-term experiments, the biofilters (6 mins EBCT) following enhanced-ZVI (1.8 mins EBCT) removed more NOM than biofilters without any pre-treatment. This could be explained by the formation of BDOC during the enhanced-ZVI process and the precipitation of iron in the biofilters. Based on these findings, a novel water treatment train, incorporating enhanced-ZVI with periodical regeneration, biofiltration, and coagulation/filtration, was proposed and evaluated.ii Lab-scale biofiltration experiments (with 6 days hydraulic retention time (HRT)) were conducted with raw water from a water treatment plant, and the results showed that biodegradation is the main NOM removal mechanism for biofiltration. With the consumption of dissolved o...

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Degradation of DBPs' precursors in river water before and after slow sand filtration by photo-Fenton process at pH 5 in a solar CPC reactor

Cited by 64 publications

References 39 publications

Humic acid and trihalomethane breakdown with potential by-product formations for atmospheric air plasma water treatment

Humic acid and trihalomethane breakdown with potential by-product formations for atmospheric air plasma water treatment

Prospecção Tecnológica Da Aplicação De Tratamento Eletroquímico E Reação De Fenton Na Remediação De Água De Produção De Biodiesel

Novel chemical and biological pre-treatments to improve water quality in drinking water treatment

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