Formation and Removal of Biodegradable Ozonation By-Products during Ozonation-Biofiltration Treatment: Pilot-Scale Evaluation

Griffini, O.; Bao, Meihua; Barbieri, K.; Burrini, D.; Santianni, D.; Pantani, Francesco

doi:10.1080/01919519908547261

Cited by 41 publications

(23 citation statements)

References 18 publications

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“…Correlation between aldehydes and assimilable organic carbon (AOC) has been shown by Schechter and Singer (2). Griffini et al (12) have also observed a relationship between the biodegradable dissolved organic carbon and the sum of aldehydes and ketoacids. A correlation between AOC and ketoacids has been also reported (9)(10)(11).…”

Section: Introductionmentioning

confidence: 93%

Influence of Ozonation Conditions on Aldehyde and Carboxylic Acid Formation.

Nawrocki¹,

Świetlik²,

Raczyk-Stanisławiak³

et al. 2003

Ozone: Science & Engineering

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The influence of ozonation conditions (i.e. ozone dose and contact time) on the aldehyde and carboxylic acids formation was studied on a pilot scale. The data derived from changes in the molecular weight distribution of natural organic matter (NOM) and the concentration of residual ozone can be applied to a selection of the optimum ozonation conditions. The results confirm the relative ease with which ozone reacts with the organic matter. The short contact time (4-6 min) appeared to be sufficient for the reaction. The higher molecular weight (1600 D) fraction of NOM seems to be slightly more reactive to ozone than the lower molecular weight fraction (500 D). It was also observed that carboxylic acids had been formed at much higher quantities than aldehydes. Two differently acting groups of aldehydes were identified. The concentration of the first one (i.e. formaldehyde, acetaldehyde) strongly depends on ozone dose, while the concentration of the second group of aldehydes (i.e. glyoxal, methylglyoxal) seems to be relatively independent of the ozone dose.

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Section: Introductionmentioning

confidence: 93%

Influence of Ozonation Conditions on Aldehyde and Carboxylic Acid Formation.

Nawrocki¹,

Świetlik²,

Raczyk-Stanisławiak³

et al. 2003

Ozone: Science & Engineering

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“…Other major by-products identified in this study include three ketoacids (i.e., glyoxylic, pyruvic, and ketomalonic acids) and two carboxylic acids (i.e., formic and oxalic acids). These oxidation by-products are more biodegradable than their precursors, thus probably raising the risk of microbial regrowth in water distribution systems (Gagnon et al, 1997;Griffini et al, 1999;DiGiano et al, 2001). The yields of aldehydes and acetone after ozonation and catalytic ozonation of individual NOM fractions are summarized in Table 2.…”

Section: Oxidation By-productsmentioning

confidence: 99%

“…According to former researches (Gagnon et al, 1997;Griffini et al, 1999;DiGiano et al, 2001), all of these oxidation byproducts are readily biodegradable. Schechter and Singer (1995) showed a correlation between aldehydes and assimilable organic carbon (AOC).…”

Section: Oxidation By-productsmentioning

confidence: 99%

“…Natural organic matter (NOM) dominates the DOC even after the surface water is coagulated and sand-filtered. It is known that NOM is the precursor of disinfection by-products and the nutrients source for bacteria reproduction in water distribution systems (Griffini et al, 1999;Singer, 1999). Therefore, it is necessary to elucidate the impact of catalytic ozonation on NOM besides the enhanced degradation of the refractory pollutants.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of ozonation and synthetic goethite-catalyzed ozonation of individual NOM fractions isolated and fractionated from a filtered river water

Zhang

Lü

et al. 2008

Water Research

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HON) and hydrophilic acid and base (HIA and HIB) were four major NOM fractions isolated from a filtered river water; so ozonation and catalytic ozonation were carried out on these fractions. Results indicate that in comparison to ozonation alone, catalytic ozonation can enhance ozone consumption, UV 254 and DOC reduction, fragmentation of fraction components with MW43000 Da, and formation of oxalic acid for these fractions under normal reaction conditions commonly adopted in water treatment plants. In addition, catalytic ozonation can enhance aldehydes formation and increase the percentage of easy biodegradable organic carbon compared with ozonation alone for HIA and HIB, but exert much less effect on these items for HOA and HON.

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“…Dissolved natural organic matter (DOM) dominates in DOC before and after conventional water treatment processes. Moreover, DOM is the precursor of disinfection by-products (DBPs) and the nutrient for bacteria reproduction in water distribution systems (Singer, 1999;Griffini et al, 1999). Therefore, it is very important to investigate the impact of catalytic ozonation on DOM destruction in comparison to ozonation alone.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

et al. 2008

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Fluorescence spectra were applied to investigate the structural changes of four dominant dissolved natural organic matter (DOM) fractions of a filtered river water before and after ozonation and catalytic ozonation. The ozonation and catalytic ozonation with synthetic goethite (FeOOH) and cerium dioxide (CeO 2 ) were carried out under normal conditions, i.e. pH 7, reaction time of 10 min, and ozone/DOC ratio of about 1. The fluorescence spectra were recorded at both excitation-emission matrix (EEM) and synchronous scanning modes. EEM results reveal that ozonation of these DOM fractions causes a significant decrease of the aromaticity of humic-like structures and an increase of electron withdrawing groups, e.g., carboxylic groups. The catalysts can further improve the destruction of the humic-like structures in catalytic ozonation. Synchronous spectra reveal that ozonation of hydrophobic acid and hydrophilic acid (HIA) yields a significant amount of by-products with low aromaticity and low molecular weight. Catalytic ozonation enhances substantially the formation of these by-products from HIA and improves the destruction of highly polycyclic aromatic structures for all examined DOM fractions.

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Formation and Removal of Biodegradable Ozonation By-Products during Ozonation-Biofiltration Treatment: Pilot-Scale Evaluation

Cited by 41 publications

References 18 publications

Influence of Ozonation Conditions on Aldehyde and Carboxylic Acid Formation.

Influence of Ozonation Conditions on Aldehyde and Carboxylic Acid Formation.

Comparative study of ozonation and synthetic goethite-catalyzed ozonation of individual NOM fractions isolated and fractionated from a filtered river water

Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

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