Advanced oxidation processes for the treatment of olive-oil mills wastewater

Cañizares, Pablo; Lobato, Justo; Paz, R.; Rodrigo, Manuel A.; Sáez, Cristina

doi:10.1016/j.chemosphere.2006.10.064

Cited by 188 publications

(107 citation statements)

References 26 publications

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“…Similar conclusions were presented by Canizares and others [18]. According to their research these high concentrations of refractory carbon also appear in the Fenton oxidation of other kind of aqueous wastes [13] and seem to be characteristic of this oxidation process.…”

Section: Fenton Process 1-stepsupporting

confidence: 72%

Combined Chemical-Biological Treatment of Effluents from Soil Remediation Processes by Surfactants Solutions Flushing

Hallmann¹,

Tomczak-Wandzel²,

Mędrzycka³

2012

Ecological Chemistry and Engineering S

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Abstract:In recent years combined chemical-biological wastewater treatment processes have received increasing interest. In the present study wastewater from soil remediation processes were treated by means of 1-step processes like Fenton, aerobic degradation and 2-steps combined method. The effluents resulting from soil remediation processes consist of high surfactant concentration solutions, mobilized oils and oil-in-water (o/w) emulsions. The effectiveness of wastewater treatment was evaluated by COD reduction and surfactant removal. The application of Fenton process alone showed around 80% of COD and surfactant removal, and in case of aerobic process only 60% of COD and 50% of surfactant removal was accomplished. However, the maximum COD reduction and surfactant removal from wastewater samples, above 90%, was obtained in aerobic degradation with Fenton process as pretreatment. Thus, the Fenton process could be effectively applied as a pretreatment step to improve the reduction of both COD and surfactant from wastewater resulting from soil remediation.

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Section: Fenton Process 1-stepsupporting

confidence: 72%

Combined Chemical-Biological Treatment of Effluents from Soil Remediation Processes by Surfactants Solutions Flushing

Hallmann¹,

Tomczak-Wandzel²,

Mędrzycka³

2012

Ecological Chemistry and Engineering S

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“…The decolorization of wastewater with increasing time is attributed to the enhancement of mass transfer of ozone from air-ozone bubbles to the liquid phase as a result of the ability of the rising bubbles to induce radial momentum [24] and increase in the gas hold up [25]. Ozonation process was observed as potential option for wastewater treatment [26]. Faster decoloration than the COD reduction during the whole process may be due to the fragmentation of the initial structures of the aromatic colored compounds [3], [6].…”

Section: Ozonationmentioning

confidence: 99%

“…The efficiency of the integration is higher due the presence of more number of oxidizing species in the system as compared to the individual process [26], [33] and heat produced by UV lamp as well as vigorous mixing of water [34].…”

Section: F Integration Of Treatment Processesmentioning

confidence: 99%

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Combined Biological and Advanced Oxidation Treatment Processes for COD and Color Removal of Sewage Water

Mehmood¹,

Batool²,

Qazi³

2013

IJESD

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Abstract-Wastewater (WW) generation is inevitable in rapidly growing and urbanizing societies resulting in significant damage to the quality and quantity of fresh water resources. The study was intended to harness the reuse potential of sewage WW using integrated wastewater treatment process. Composite sample of sewage WW was collected from inlet of sewage wastewater treatment plant. The WW sample was batch wise subjected to activated sludge process (ASP), ozonation, UV irradiation, H 2 O 2 oxidation and sand filtration separately for different time intervals (i.e. 0 to 60 min) and concentrations of H 2 O 2 (0.1 to 1.0 mlL -1 ), followed by the integration of all the processes at their optimum conditions. Batch experiments were performed in pyrex containers using 1.5L sample except for ASP that is 20L. Efficiencies were measured in terms of COD, color and TSS removal along with changes in pH and temperature. Biological diversity of WW was also determined using cultural techniques followed by biochemical tests. Color reduction was much higher and faster than COD in all the tested treatment processes. Ozonation was the fastest process to remove 78% color in 30 minutes however, ASP was more economical for the same efficiency but requires high hydraulic retention time (HRT). Increase in UV irradiation time reduced COD and color by 54 and 69% after 60min respectively. Sand filter efficiently removed 97% TSS with marginal reduction in COD. Integration of 4 hr ASP, 24 min ozonation and 10 min UV exposure with 1 ml L -1 H 2 O 2 dose yielded 98 and 100% COD and Color reduction respectively.

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“…In recent years, electrochemical oxidation with conductive-diamond anodes has become one of the most promising technologies in the treatment of industrial wastes polluted with organics [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] and in the electrosynthesis of inorganic oxidants [13,[33][34][35]. Compared with other electrode materials, conductive-diamond has shown higher chemical and electrochemical stability as well as a higher current efficiency.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

et al. 2007

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 3043 Abstract A new method for the synthesis of peroxomonophosphate, based on the use of boron-doped diamond electrodes, is described. The amount of oxidant electrogenerated depends on the characteristics of the supporting media (pH and solute concentration) and on the operating conditions (temperature and current density). Results show that the pH, between values of 1 and 5, does not influence either the electrosynthesis of peroxomonophosphate or the chemical stability of the oxidant generated. Conversely, low temperatures are required during the electrosynthesis process to minimize the thermal decomposition of peroxomonophosphate and to guarantee significant oxidant concentration. In addition, a marked influence of both the current density and the initial substrate is observed. This observation can be explained in terms of the contribution of hydroxyl radicals in the oxidation mechanisms that occur on diamond surfaces. In the assays carried out below the water oxidation potential, the generation of hydroxyl radicals did not take place. In these cases, peroxomonophosphate generation occurs through a direct electron transfer and, therefore, at these low current densities lower concentrations are obtained. On the other hand, at higher potentials both direct and hydroxyl radical-mediated mechanisms contribute to the oxidant generation and the process is more efficient. In the same way, the contribution of hydroxyl radicals may also help to explain the significant influence of the substrate concentration. Thus, the coexistence of both phosphate and hydroxyl radicals is required to ensure the generation of significant amounts of peroxomonophosphoric acid.

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Advanced oxidation processes for the treatment of olive-oil mills wastewater

Cited by 188 publications

References 26 publications

Combined Chemical-Biological Treatment of Effluents from Soil Remediation Processes by Surfactants Solutions Flushing

Combined Chemical-Biological Treatment of Effluents from Soil Remediation Processes by Surfactants Solutions Flushing

Combined Biological and Advanced Oxidation Treatment Processes for COD and Color Removal of Sewage Water

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

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