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At least 991 records · Page 55Linked to original sources
PubMed2002

Effect of chemical treatment on soluble residual COD in textile wastewaters.

The effect of chemical treatment on the magnitude of soluble residual COD in the biological treatment effluent is investigated for knit fabric finishing wastewater. Bentonite is selected for its potential to remove soluble COD together with color and particulate components. Chemical treatment using bentonite, when applied prior to biological treatment removes around 40% of the biodegradable as well as soluble inert COD initially present in the wastewater. As a chemical post-treatment, it acts as a polishing step, removing particulate matter and a minor portion of around 20% of the remaining soluble COD. These findings suggest chemical pre-treatment as a better alternative for the optimization of soluble COD removal.

Bentonite↗
PubMed2002

Decolorization of textile wastewater by ozonation and Fenton's process.

The aim of this study is to investigate the effect of some operational parameters on the efficiency of ozonation and Fenton's process for decolorization and COD removal. Acid Red 337 and Reactive Orange 16 dye solutions and the effluents of acid and reactive dye-bath effluents were used in the experiments. The influence of ozone dose and pH for color and COD removal from the wastewater were studied. Increasing the ozone dose increased the rate constants, and color and COD removal efficiencies. Ozone consumption ratio per unit color and COD removal at any time was found to be almost the same while the applied ozone dose was different. pH did not significantly affect color and COD removal from the wastewater by ozonation. In spite of having high color removal efficiencies (60-91%), limited COD removal efficiencies between 9-17% at 30 minutes ozonation time were obtained. In the Fenton oxidation experiments, the effects of pH, temperature, dosage of ferrous sulfate and hydrogen peroxide, and the proper ratio of Fe(II)/H2O2 were studied. The result indicates that up to 99% color removal and 82% COD removal can be obtained by Fenton's oxidation. While Fenton's oxidation was greatly affected by the pH value, temperature of wastewater did not significantly affect the Fenton process for color removal. Increasing the dose of both hydrogen peroxide and ferrous sulfate enhanced the removal efficiencies of color and COD. Suitable ratios of Fe(II)/H2O2 were found to be between 0.5 and 0.83.

Coloring Agents↗
PubMed2002

[Application of different textile vascular grafts in the aorto-femoral location and ways for their improvement].

A comparative analysis of 220 reconstructions of the aortofemoral segment with the application of vascular prostheses of firms "Sever" and "Vascutek" was made. It was established that in patients with obvious anemia and hemodilution (hematocrit less than 25%, hemoglobin less that 80 g/l) an important condition for less total blood loss was to impart the zero surgical porosity to the graft wall at the preoperative stage. However, the biological impregnation used for these purposes reinforces the inflammatory component in the implantation of the vascular graft. The authors propose to use a more inert polytetrafluoroethylene film to impart the zero surgical porosity to the graft wall.

Aorta↗