摘要:

The ozonation of aniline and anilinium ion in aqueous solution is investigated by determining the product distributions at different degrees of ozonation. Results indicate that anilinium ion, although less reactive than aniline, still has a remarkable reactivity towards ozone. The high anilinium ion reactivity and the observed product distributions are explained by assuming a radical mechanism for anilinium ion ozonation, whereas the behavior of aniline appears to be regulated mainly by the electrophilic ozonolysis mechanism.

ISSN:0191-9512    

DOI:10.1080/01919518508552361

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Ozonation has been successfully applied in experimental fish culture recirculation systems, especially to oxidize some of the most important metabolites (such as nitrite, ammonium, BOD) at times when these concentrations reach a daily peak level. In this study the oxidation rates for ammonium, nitrite, and BOD have been determined for each of these components separately or in combination, using an improved design of the contacting chamber. Two flow rates and three ozone concentrations were employed. Ammonia oxidation rates were slowest while nitrite and BOD removal was rapid. Ozone concentrations substantially influenced the oxidation rates for ammonium ion. Nitrate was oxidized equally rapidly under almost all operational conditions. Slight differences in oxidation rates were noted for both ammonia and nitrite as long as the BOD was high.

ISSN:0191-9512    

DOI:10.1080/01919518508552362

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Industrial wastewater effluent standards in the United States are being established in terms of both conventional parameters like BOD and specific organic compounds called priority pollutants. Some of these compounds are difficult to treat biologically and the removal mechanisms may include biodegradation, stripping, sorption, and/or combinations of these removal mechanisms. Biorefractory organic compounds that are resistant or difficult to biodegrade, toxic, and/or are inhibitory to microbial growth may present problems in biological treatment systems. Powdered activated carbon addition and chemical oxidation with ozone-assisted biological treatment systems have been investigated with some of these compounds. This paper includes data from controlled activated sludge systems, systems receiving powdered activated carbon, and systems with preozonation assist. Complete mass balances, including influent, effluent, waste sludge and off-gas analyses of the specific compounds were conducted to determine the actual fate of these compounds.

ISSN:0191-9512    

DOI:10.1080/01919518508552363

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Microbiological stability in water mains has become an increasing problem for waterworks where more and more surface water is used for distribution requirements. Even when surface water is treated, appropriately, it usually contains a higher amount of organic compounds than does groundwater, and during certain periods, can attain temperatures between 20 and 25°C. Furthermore, ozonization applied during treatment modifies structures of the dissolved organic materials.

ISSN:0191-9512    

DOI:10.1080/01919518508552364

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Ozonation can improve the properties of paper pulps. This is why the use of ozone is considered for improving recyclable paper pulps. Ozonation has no deinking effect. According to the composition of the recycled papers, it is possible to improve their mechanical or optical properties. It is difficult to foresee if these results will be significant from the technical and economical point of view because of the heterogeneity of the starting material. However, in certain cases, ozonation certainly is an alternative not to be neglected.

ISSN:0191-9512    

DOI:10.1080/01919518508552365

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Addition of hydrogen peroxide to water during ozonation increases the rate of oxidation of organic compounds and ozone transfer. Coupling ozone with hydrogen peroxide can increase the efficiency of a drinking water treatment line, for example in removing THM precursors. To optimize this oxidation process, the quantity of hydrogen peroxide added and the point of injection must be carefully selected.

ISSN:0191-9512    

DOI:10.1080/01919518508552366

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0191-9512    

DOI:10.1080/01919518508552360

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor