Inhibition of Hydroxyl Radical Reaction with Aromatics by Dissolved Natural Organic Matter

Lindsey, Michele E.; Tarr, Matthew A.

doi:10.1021/es990457c

Cited by 264 publications

(137 citation statements)

References 55 publications

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“…This is probably due to the presence of additional organic material liberated form the sludge during the biological treatment, the so called dissolved organic matter, like humic acids and other constituents (Baker and Spencer 2004;Simjouw et al 2005). Humic acid, for instance, is known to inhibit reactions of aromatic compounds by radicals (Lindsey and Tarr 2000), while on the other hand; it may also be substrate for mineralization (Li et al 1997b). This can explain the delayed release of radioactive CO 2 in the first few hours (see Fig.…”

Section: Discussionmentioning

confidence: 99%

Combined biological–chemical procedure for the mineralization of TNT

Kröger

Fels

2006

Biodegradation

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Contamination of ground and surface water with 2,4,6-trinitrotoluene (TNT) and its biological and chemical transformation products are a persisting problem at former TNT production sites. We have investigated the photochemical degradation of TNT and its aminodinitro-(ADNT) and diaminonitrotoluene (DANT) metabolites using OH-radical generating systems like Fenton and hydrogen peroxide irradiated with UV, in order to compare the degradation and mineralization rate of ADNT- and DANT-isomers with TNT itself. As a result, we find that the aminoderivatives were mineralized much faster than TNT. Consequently, as ADNTs and DANTs are the known dead-end products of biological TNT degradations, we have combined our photochemical procedure with a preceding biological treatment of TNT by a mixed culture from sludge of a sewage plant. This consecutive degradation procedure, however, shows a reduced mineralization rate of the ADNTa and DANTs in the biologically derived supernatant as compared to the pure substances, suggesting that during the biological TNT treatment by sludge competing substrates are released into the solution, and that a more defined biological procedure would be necessary in order to achieve an effective, ecologically and economically acceptable mineralization of TNT from aqueous systems.

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Section: Discussionmentioning

confidence: 99%

Combined biological–chemical procedure for the mineralization of TNT

Kröger

Fels

2006

Biodegradation

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“…It is well known that natural organic matter can act as the major reservoir for hydroxyl free radicals, and the same might apply to free aromatic radicals (Schwarzenbach et al, 1993). In addition, Lindsey et al (2000) reported that the natural organic matter including humic and fulvic acids inhibits the degradation of aromatic compounds by means of the free hydroxyl radical, such as phenol and o-cresol; however, they suggested that the most likely reason for the observed inhibition was a result of decreased reactivity of aromatic compounds through the partitioning to natural organic matter and not the scavenging of the hydroxyl radical by natural organic matter.…”

Section: Resultsmentioning

confidence: 99%

Deodorization of pig manure using lignin peroxidase with different electron acceptors

Yan

Wei

Yuan

et al. 2016

Journal of the Air & Waste Management Association

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Odor pollution is a big environmental problem caused by large-scale livestock production in China, and developing a practical way to reduce these odors is pressing. In this study, a combination of 0.2-1.0 U/mL lignin peroxidase (LiP) and one of three peroxides (H 2 O 2 , CaO 2 , 2Na 3 CO 3 ·3H 2 O 2 ) was examined for its efficiency in reducing the release of eight chemicals (propionic acid, isobutyric acid, isocaproic acid, isovaleric acid, phenol, p-cresol, indole, and skatole), NH 3 , H 2 S, and odor intensity from pig manure. The results showed an approximately 90% reduction in p-cresol, 40-60% reduction in odor intensity, 16.5-40% reduction in indolic compounds, and 25-40% reduction in volatile fatty acids. Being the electron acceptors of LiP, 2Na 3 CO 3 ·3H 2 O 2 and CaO 2 performed better than H 2 O 2 in reducing the concentration of eight chemicals, NH 3, H 2 S, and odor intensity from pig manure. The effect of deodorization can last for up to 72 hr.Implications: In China, one of the major environmental problems caused by confined feeding is odor pollution, which brings a major threat to the sustainability, profitability, and growth of the livestock industry. To couple the LiP with the electron acceptors, a low-cost, simple, and feasible method for odor removal was established in this study. Based on the study results, a practical treatment method was provided for odor pollution and supply the farm operators a more flexible time to dispose treated manure.PAPER HISTORY

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“…It consumes ozone molecule and thus prevents the further interactions between ozone molecular and DCAA. Furthermore, HA are considered as exceptional radical scavengers (Lindsey and Tarr 2000), the radicals produced in ozone decomposition tend to be quenched, resulting in a lowered efficiency in DCAA oxidation. After the bentonite particles are added, they disperse rapidly in the water, and are fluidized under the affects of the gas bubbling, thus interactions among gas (ozone), liquid (water) and solid (bentonite particles) phases are enhanced.…”

Section: Discussionmentioning

confidence: 99%

Removal of dichloroacetic acid from drinking water by using adsorptive ozonation

et al. 2011

Ecotoxicology

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Chloroacetic acids, formed during the disinfection process in potable water production, are considered to pose a potential risk to human health. This article deals with dichloroacetic acid (DCAA) removal from drinking water by using a process of bentonite based adsorptive ozonation. This process is formed by combined addition of ozone, bentonite and Fe(3+). During the reaction, DCAA is removed by the joint effect of adsorption, ozonation and catalytic oxidation. In addition, under the effect of the adsorption, natural organic matters (NOM) can be adsorbed onto the bentonite surface, resulting in a reduced scavenging effect toward HO· radicals, and hence eliminate the negative effect of NOM on DCAA removal. At the initial stage of the reaction, Fe(3+) is rapidly hydrolyzed to polycations and adsorbed onto the bentonite surface or into its structural layers. This positively charges the surface of the bentonite and increases its surface area, resulting in a strong adsorption of HA or DCAA. Furthermore, Fe(3+) catalyzes ozone decomposition to form HO· thus further improving the efficiency. The adsorptive ozonation has been shown to be potentially advantageous in destruction of toxic, dissolved pollutants in drinking water, and appears to have great potential for a wide range of treatment applications.

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Inhibition of Hydroxyl Radical Reaction with Aromatics by Dissolved Natural Organic Matter

Cited by 264 publications

References 55 publications

Combined biological–chemical procedure for the mineralization of TNT

Combined biological–chemical procedure for the mineralization of TNT

Deodorization of pig manure using lignin peroxidase with different electron acceptors

Removal of dichloroacetic acid from drinking water by using adsorptive ozonation

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