摘要:

Mass Transfer of ozone absorbed by water in a semi-comtinuous stirred reactor is studied at the lab scale. Experimental investigation using a complete factorial scheme shows a predominant effect of agitation speed and gas flow and results in a correlation for the mass transfer coefficient, k1a. Solubility of ozone in water is estimated by evaluation of an apparent Henry's law constant for different temperatures (20* and 50*C), pH values (2 and 7) and a t constant ionic strength (0.13).

ISSN:0191-9512    

DOI:10.1080/01919518708552384

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The ozonation of glyoxylic acid in aqueous solution is investigated in semicontinuous and continuous reacting systems to follow the evolution of both chemical products and kinetics. Evidence is given of formation of small amounts of formic acid and -of the promoting effect of peroxidic intermediates upon oxalic acid ozonation. Kinetic results indicate that the ozonation process develops according to a radical chain mechanism initiated by ozone attack on glyoxylic acid.

ISSN:0191-9512    

DOI:10.1080/01919518708552385

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In an aqueous solution of the water-soluble constituents of kerosene, naphthalenes were destroyed more quickly by ozone than alkylbenzenes at both pH 5 and pH 9. When a kerosene surface film was ozonized, selective attack on aromatic relative to aliphatic hydrocarbon constituents occurred. Alkylbenzoic acids were the major products. Other oxygenated products (aldehydes, alcohols, peroxides) also were detected at lower concentrations. When ozonized separately, naphthalene reacted to form 2-formylcinnamaldehyde, 1-methylnaphthalene produced methylated isomers of 2-formylcinnamaldehyde, and tetrahydronaphthalene formed 1-tetralone.

ISSN:0191-9512    

DOI:10.1080/01919518708552386

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Starting in the early 1970s, the application of ozone for drinking water treatment began to evolve from primarily single-purpose, single-stage use for disinfection, taste and odor control or iron and manganese oxidation, to multipurpose uses of ozone. As a result, most of the newer drinking water treatment plants have installed two- and even three-stages of ozonation. in order to maximize the technological benefits of ozone and to minimize the costs involved.

ISSN:0191-9512    

DOI:10.1080/01919518708552387

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Pilot plant studies were carried out on the effect of ozone on the chemical content of a secondary domestic and industrial sewage. Results are expressed in terms of COD, BOD5, nitrite ion concentrations, bacterial counts, XAD-4-extraetable compounds, and free amino acid concentrations. Ozone dosages of 6 to 12 mg/L were found to reduce levels of fecal bacteria, COD and nitrite ion concentrations significantly, to modify the nature and the concentration of XAD-4-extraetable compounds, and to increase the concentration of free amino acids.

ISSN:0191-9512    

DOI:10.1080/01919518708552388

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0191-9512    

DOI:10.1080/01919518708552383

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor