Journal ArticleDOI
Wet oxidation lumped kinetic model for wastewater organic burden biodegradability prediction.
Svetlana Verenich,Juha Kallas +1 more
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TLDR
This work proposes a model that can describe the oxidation process via organic concentration characteristics such as chemical oxygen demand, biochemical oxygen demand and immediately available BOD and so can allow the prediction of biodegradability (i.e., BOD/COD ratio).Abstract:
In many cases, treatment of wastewaters requires a combination of processes that very often includes biological treatment. Wet oxidation (WO) in combination with biotreatment has been successfully used for the treatment of refractory wastes. Therefore, information about the biodegradability of wastewater solutes and particulates after wet oxidation is very important. The present work proposes a model that can describe the oxidation process via organic concentration characteristics such as chemical oxygen demand (COD), biochemical oxygen demand (BOD), and immediately available BOD (IA BOD) and so can allow the prediction of biodegradability (i.e., BOD/COD ratio). The reaction mechanism includes the destruction of nonbiodegradable substances bytwo pathways: oxidation to carbon dioxide and water and oxidation to larger biodegradable compounds with their further degradation to smaller ones measured via IA BOD. The destruction of small biodegradable compounds to end products is also included in the model. The experiments were performed at different temperatures (170-200 degrees C) and partial oxygen pressures (0.5-1.5 MPa) in a batch stainless steel high-pressure autoclave. The model of concentrated thermomechanical pulp circulation water was selected for the experiments. The proposed model correlates with the experimental data well and it is compared with other WO models in the literature.read more
Citations
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A review of wet air oxidation and Thermal Hydrolysis technologies in sludge treatment.
TL;DR: Current hydrothermal technologies, roles of wet air oxidation and thermal hydrolysis in sludge treatment, and challenges faced by these technologies are reviewed.
Journal ArticleDOI
Synthesis and Photocatalytic Activity of Zn2GeO4 Nanorods for the Degradation of Organic Pollutants in Water
TL;DR: The results revealed that the Zn(2)GeO(4) nanorods have a much higher photocatalytic activity for decomposing organic pollutants in aqueous solution than both Zn (2) GeO( 4) prepared by a conventional solid-state reaction and widely used TiO( 2) (Degussa P25).
Journal ArticleDOI
Synthesis and Photocatalytic Activity of Calcium Antimony Oxide Hydroxide for the Degradation of Dyes in Water
TL;DR: In this paper, the physicochemical properties of the as-synthesized CaSb2O5(OH)2 photocatalyst were characterized by X-ray diffraction, UV−vis diffuse reflectance spectroscopy, transmission electron microscopy, electron spin resonance, and Xray photoelectron spectrography.
Journal ArticleDOI
Fundamental mechanisms and reactions in non-catalytic subcritical hydrothermal processes: A review
TL;DR: The fundamental mechanism for hydrothermal processing of sludge and the formation of different free radicals and intermediates therein is reviewed, and the proposed kinetic models for the two processes are reviewed and the advantages and disadvantages of each model are outlined.
Journal ArticleDOI
Thermal and thermo-chemical pre-treatment of four waste residues and the effect on acetic acid production and methane synthesis.
P. J. Strong,Daniel J. Gapes +1 more
TL;DR: This study illustrated the power of wet oxidation for solids destruction and its potential to improve methane yields generated during anaerobic digestion.
References
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Journal ArticleDOI
Automatic Selection of Methods for Solving Stiff and Nonstiff Systems of Ordinary Differential Equations
TL;DR: Test results indicate that many problems can be solved more efficiently using this scheme than with a single class of methods, and that the overhead of choosing the most efficient methods is relatively small.
Journal ArticleDOI
Integration of chemical and biological oxidation processes for water treatment: Review and recommendations
Jon P. Scott,David F. Ollis +1 more
TL;DR: The literature of studies which used a combination of chemical and biological degradation (usually oxidative) of organic contaminants in water is reviewed in this paper, where four wastewater contaminant types are identified which can benefit from combined processes: recalcitrant compounds, biodegradable wastes, inhibitory compounds and intermediate dead-end products.
Journal ArticleDOI
Generalized kinetic model for wet oxidation of organic compounds
TL;DR: In this article, a generalized kinetic model for wet oxidation of organic compounds was developed based on a simplified reaction scheme considering acetic acid as the rate-limiting intermediate, and the selectivity of product vs. intermediate formations was quantified by the ratio of the two reaction rate constants.
Journal ArticleDOI
Catalytic and Noncatalytic Wet Oxidation
TL;DR: In this paper, the reactivity of organic compounds composed of C, H, and O, dyes, amides, and water-soluble polymers was correlated well with their carbon content in the molecule (C/MW).
Journal ArticleDOI
Comparison of Catalyzed and Noncatalyzed Oxidation of Azo Dye and Effect on Biodegradability
Jelka Donlagic,Janez Levec +1 more
TL;DR: In this paper, both catalytic and non-catalytic oxidations of diluted azo dye (Orange II) solutions were performed at temperatures from 180 to 240 °C and oxygen partial pressure of 10 bar.
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