摘要:

Activated hydrogen peroxide produces very reactive OH-radicals which destroy hazardous contaminants in water. The principles and different methods of activation are described. Results from laboratory studies show the numerous applications of this new technology. A successful scaleup of laboratory tests to an industrial level is discussed. Finally, a cost estimate for treating different types of water with hydrogen peroxide is presented.

ISSN:0191-9512    

DOI:10.1080/01919519508547541

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Ozone used in preoxidation for water treatment processes allows the removal of inorganic compounds such as iron and manganese. The reactivity of ozone and manganese has been studied in a wide pH range. However, some difficulties appeared in the determination of the different species because of secondary reactions, the main difficulty being the interaction between indigo (used to determine ozone concentration) and manganese dioxide formed during ozonation.

ISSN:0191-9512    

DOI:10.1080/01919519508547542

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Metal-complex azo dyes constitute a significant fraction of the dyes used in the textile industry and exhibit properties such as superior light- and wash-fastness. While effluent color is not always regulated, the textile finishing industry often decolorizes wastewater using processes including chemical oxidation. In this study, the use of ozone, hydrogen peroxide/ozone and UV/ozone oxidant systems was examined for treatment of two common metal-complex (premetalized) dyes, Acid Black 52 (chromium) and Direct Blue 80 (copper). Oxidant dosages required for decolorization of these dyes were determined. The effect of bicarbonate alkalinity on the ozonation and the hydrogen peroxide/ozone processes also was examined.

ISSN:0191-9512    

DOI:10.1080/01919519508547543

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Competition of direct and decomposition reactions that ozone can undergo in water when a given compound is present is studied according to concepts of absorption theories. The importance of different parameters, such as pH, rate constants, mass transfer coefficients and concentration of reactants, is considered to clarify which reaction prevails. Parameters like Hatta numbers (film theory) or diffusion and reaction times (surface renewal theories) are key factors to check the competition of these reactions.

ISSN:0191-9512    

DOI:10.1080/01919519508547544

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The purpose of this study was to point out processes that can provide triazine oxidation via hydroxyl radical production in a water treatment line. We focus our attention on:

ISSN:0191-9512    

DOI:10.1080/01919519508547545

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Bacterial assay which can detect the genotoxicity, induction of error-prone repair genes on DNA was applied to samples which were collected at a night soil treatment plant. The genotoxicity of each sample was measured by using this bacterial assay, called the umu test. Strong genotoxic potency was found in the sediments of raw night soil, that is, human feces. There are some substances which show toxicity to the DNA and are attributable to the baked foods or metabolites in human digestive organs. These potencies could not be removed easily in the biological decomposition process through survey of the treatment plant. It was quite clear that more effective reduction could be achieved by ozonation at the treatment condition of about 1 mg O3/mg C.

ISSN:0191-9512    

DOI:10.1080/01919519508547546

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This study statistically examined the impacts of ozone application methods on the two representative types of pulp mill effluents. To facilitate statistical evaluation, the experiments were designed as paired block experimental series, and the pooled experimental errors in each block were used for t-test and ANOVA analysis.

ISSN:0191-9512    

DOI:10.1080/01919519508547547

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor