H. Robey

Bio: H. Robey is an academic researcher. The author has contributed to research in topics: Inert waste & Household hazardous waste. The author has an hindex of 1, co-authored 1 publications receiving 13 citations.

Wet air oxidation for hazardous waste control

Abstract: The Wetox® process has been proven effective on a variety of industrial and municipal waste streams. Many of these streams contained chemicals which An advantage of the technology is that elements such as sulphur, chlorine and nitrogen are retained in solution, thus minimizing any potential air poll The first commercial Wetox system has been installed at a chemical company in Ontario in the spring of 1982. This unit is being designed to treat about

Application of response surface methodology and central composite design for the optimization of textile dye degradation by wet air oxidation

Abstract: Background The present study is aimed at investigating the degradation of azo dye solution of AR 274 by wet air oxidation conditions. The central composite design matrix and response surface methodology were applied in designing the experiments to evaluate the interactive effects of the three most important operating variables. Thus, the interactive effects of oxygen pressure (3.0 to 5.0 MPa), temperature (100°C to 250°C), and time (30 to 90 min) on the degradation of dye were investigated.

Integrated biorefinery wastewater design

Abstract: Regardless of their feedstock, all ethanol-producing biorefineries face the common challenges of treating their effluent efficiently and economically to meet local discharge requirements, and minimising their net water consumption. In terms of process integration, these twin requirements can be addressed by (i) improving existing secondary (i.e. biological) treatment methods to maximise COD reduction, (ii) incorporating a tertiary ‘polishing’ stage to remove colour, and (iii) using (reverse osmosis) membrane technology to recover process water. This paper considers disposal and/or treatment options for the post-biological treatment of ethanol stillage. The illustrative examples presented show how the secondary and tertiary treatment stages in a biorefinery can be energy integrated via the (biogas derived) power from the anaerobic digester.

Some intermediates in the wet air oxidation of phenanthrene adsorbed on powdered activated carbon

Abstract: The tricyclic aromatic hydrocarbon, phenanthrene, was rapidly destroyed when sorbed on Nuchar SA powdered activated carbon and subjected to conditions typical of wet air regeneration. Hydrodarco H carbon was less efficient. Fifteen intermediate degradation products were identified, ranging in complexity from phenol to oxygenated biphenyl derivatives; degradation appeared to involve the participation of very reactive and unselective oxidants, such as the hydroxyl radical, on the activated carbon surface. Dichloromethane-extractable products with some toxicity to yeast (Saccharomyces cerevisiae) were produced during the early stages of wet air regeneration of carbon with sorbed phenanthrene, but the toxicity decreased in later stages. Similar extracts of phenanthrene-loaded and wet air regenerated carbon were not mutagenic in a standard microbial assay (Ames test).

Pd–Pt/Al2O3 bimetallic catalysts for the advanced oxidation of reactive dye solutions

Abstract: The Pd–Pt/Al 2 O 3 bimetallic catalysts showed high activities toward the wet oxidation of the reactive dyes in the presence of 1% H 2 together with excess oxygen. Palladium was believed to act as a co-catalyst to spillover the adsorbed H 2 onto the surface of the oxidized Pt surface, and thereby the reducibility of the Pt increased greatly. The organic dye molecule adsorbed on the reduced Pt surface more easily than the oxidized Pt surface under the competition with excess oxygen, which is an essential step for the catalytic wet oxidation (CWO). The Pd–Pt/Al 2 O 3 catalysts also produced H 2 O 2 from H 2 /O 2 mixture, and the hydroxyl radical was formed through the subsequent decomposition of H 2 O 2 . Additional oxidation of the reactive dyes was obtained with hydroxyl radical. The high activities of the Pd–Pt/Al 2 O 3 catalysts were believed to be due to the combined effects of the faster redox cycle resulting from the increased reducibility of Pt surface and the additional oxidation of the reactive dyes with hydroxyl radical.

The radiation treatment of waste water solutions containing 2-mercaptobenzothiazole and N-oxydiethylene-2-benzothiazolesulfenamide

Abstract: The effect of γ-radiation on waste water solutions containing 2-mercaptobenzothiazole and N-oxydiethylene-2-benzothiazolesulfenamide was studied by UV spectrosocopy, COD, BOD5 and TOC determination and Pitter's kinetic test of biodegradation. No improvement in biodegradability of model solutions was detected and in case of 2-mercaptobenzothiazole colloidal turbidity removable by coagulation appeared.