Conditioning of aluminium-based water treatment sludge with Fenton’s reagent: Effectiveness and optimising study to improve dewaterability

Tony, Maha A.; Zhao, Yaqian; Fu, Jianfeng; Tayeb, Aghareed M.

doi:10.1016/j.chemosphere.2008.03.032

Cited by 132 publications

(69 citation statements)

References 15 publications

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“…This finding is in agreement with the previous observations. [10,21] The results, illustrated in Figure 2b,s h o was i g n i ficant enhancement of the degradation process when the H 2 O 2 concentration was increased from 100 to 400 mg L ¡1 . Increasing H 2 O 2 concentration results in the generation of additional reaction intermediates, ¢OH radicals, that enhance the degradation process.…”

Section: Effect Of Fenton's Reagent Concentrationsmentioning

confidence: 92%

“…AOPs are characterised by the use of highly reactive intermediates, hydroxyl radicals (¢OH), which attack the organic pollutants in the wastewater and mineralise them. [10,15] Such processes include UV, O 3 /H 2 O 2 , [1] O 3 /UV, [16] TiO 2 photocatalysis, and Fenton and photo-Fenton processes. [17,18] Among those AOPs, the Fenton's reagent, a homogeneous catalytic system comprising hydrogen peroxide and a ferrous salt, is an interesting solution because it allows high mineralisation levels at room temperature and pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

“…[5,8] Conversely, adsorption processes are superior to other techniques for wastewater treatment in terms of simplicity of design/operation and insensitivity to toxic substances. [9,10] Among several materials used as adsorbents, activated carbon has undoubtedly been the most popular and widely used adsorbent in wastewater treatment throughout the world. [11] Unfortunately, activated carbon also presents disadvantages, i.e., it is highly microporous and these small pores create limited diffusion by slowing pollutant uptake and reducing material efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Treatment of laundrette wastewater using Starbon and Fenton's reagent

Tony

Parker

Clark

2016

Journal of Environmental Science and Health, Part A

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Section: Effect Of Fenton's Reagent Concentrationsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Treatment of laundrette wastewater using Starbon and Fenton's reagent

Tony

Parker

Clark

2016

Journal of Environmental Science and Health, Part A

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“…However, as the polymer flocculation agent is difficult to degrade, its persistent impacts on environment after final disposal is still a technological hurdle (Tony et al, 2008).…”

Section: Addition Of Flocculation Agentmentioning

confidence: 99%

“…Lu et al(2003) applied Fenton-like reagent (Fe 3+ /H 2 O 2 ) on WAS and attained promising effect (Reduction rate of SRT by around 85%) (Tony et al, 2008 Beyond classical Fenton process, lab-scale photo-Fenton process was also applied in sludge treatment. Tokumura et al (2007) incorporated a photo reactor with a UV lamp as the photo source.…”

Section: Application In Sludge Conditioningmentioning

confidence: 99%

Improving dewaterability of waste activated sludge through advanced oxidization process

Zhou¹

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The production of excess sludge in biological wastewater treatment processes has been a serious issue for the operation of wastewater treatment plants (WWTPs) on both economic and environmental sides. To reduce the volume of sludge to be disposed of, the sludge dewaterability needs to be improved through conditioning processes. Many conditioning methods have been developed and applied for this purpose. Among them, the advanced oxidization process is a promising technique due to its high efficiency, and economical and environmental advantages. The aim of this thesis is to apply a series of novel advanced oxidization techniques on sludge conditioning process for the improvement of sludge dewaterability, such as the indigenous iron activated peroxidation and zero-valent iron (ZVI)/hydrogen peroxide, zero-valent iron/persulfate. Also, the role of extracellular polymeric substances (EPS) during the advanced oxidization process was also investigated to expand the knowledge of basic mechanism on the sludge dewaterability.Capillary suction time stands for the time needed for completing the filtration of sludge, is used as quantitative indexes for the evaluation of the sludge dewaterability.The indigenous iron was firstly utilized as the substitute for externally supplied iron salt to improve dewaterability of waste activated sludge through catalysing the hydrogen peroxide. Significant improvement in sludge dewaterability was attained after the addition of hydrogen peroxide at 30 mg/g total solid (TS) and 28 mg/g TS under acidic conditions (pH = 3.0), with the highest reduction of capillary suction time being 68% and 56%, respectively, for sludge containing an iron concentration of 56 mg Fe/g TS and 25 mg Fe/g TS, respectively. The observations were due to Fenton reactions between the iron contained in sludge (indigenous iron) and hydrogen peroxide. For the sludge with an insufficient level of indigenous iron, the addition of iron salt was found to be able to improve the sludge dewaterability.To expand the understanding of the indigenous iron activated advanced oxidization process, the effect of indigenous iron activated peroxidation on methane production from waste activated sludge was also investigated. Pre-treatment of waste activated sludge for 30 min at 50 mg H 2 O 2 /g TS and pH 2.0 (iron concentration in sludge was 7 mg/g TS) substantially enhanced waste activated sludge solubilization. Biochemical methane potential tests demonstrated that methane production was II improved by 10% at a digestion time of 16 d after incorporating the indigenous iron activated peroxidation pre-treatment.The combined conditioning process with zero-valent iron and hydrogen peroxide was applied to improve dewaterability of a full-scale waste activated sludge. The combination of ZVI and hydrogen peroxide at pH 2.0 substantially improved the waste activated sludge dewaterability due to Fentonlike reactions. The highest improvement in waste activated sludge's dewaterability was attained at 500 mg ZVI/L and 250 mg hydrogen peroxide/...

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Effect of astaxanthin and aluminum chloride on erythrocyte G6PD and 6PGD enzyme activities in vivo and on erythrocyte G6PD in vitro in rats

Temel

Bengü

Akkoyun

et al. 2017

J Biochem & Molecular Tox

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In this study, we investigated the effect of astaxanthin (Ast) and aluminum (Al) on the erythrocyte glucose-6-phosphate dehydrogenase (G6PD) and 6-phosphogluconate dehydrogenase (6PGD) enzymes activities in vivo and on G6PD enzyme in vitro in rats. For in vitro studies, G6PD enzyme was purified from rat erythrocyte by using 2',5'-ADP-Sepharose 4B affinity gel. The effects of Ast and Al ion were investigated on the purified enzyme. It was determined that Ast increased the enzyme activity, whereas Al inhibited the enzyme activity noncompetitively (IC values; 0.679 mM, K values 1.32 mM). For in vivo studies, the rats were divided into the groups: control (Cont.), Al, Ast, and Al + Ast. The last three groups were compared with the control group. In Al group, a significant degree of inhibition was observed in the activity of G6PD and 6PGD enzymes when compared with the control group (P < 0.05), whereas there was an increase in the activities of G6PD and 6PGD enzymes in Ast and Al + Ast groups (P < 0.05).

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Conditioning of aluminium-based water treatment sludge with Fenton’s reagent: Effectiveness and optimising study to improve dewaterability

Abstract: Publication informationChemosphere, 72 (4): 673-677Publisher Elsevier

Cited by 132 publications

References 15 publications

Treatment of laundrette wastewater using Starbon and Fenton's reagent

Treatment of laundrette wastewater using Starbon and Fenton's reagent

Improving dewaterability of waste activated sludge through advanced oxidization process

Effect of astaxanthin and aluminum chloride on erythrocyte G6PD and 6PGD enzyme activities in vivo and on erythrocyte G6PD in vitro in rats

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