摘要:

Pilot scale experiments were performed to evaluate the ability of ozonation, ozone/hydrogen peroxide treatment and nanofiltration to reduce levels of organic matter, mutagenicity, total adsorbable halogens, color and turbidity from purified and bank-filtered surface water rich with humic material.

ISSN:0191-9512    

DOI:10.1080/01919512.1994.10555747

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Ozone application at low level seems to be a good treatment to control bulking. The best treatment can be 0.5 to 1 mg O3/g TVM.h (total volatile matter hour); φR= 30 min. The injection of the ozone is into the recirculation sludge pipe. It is possible to improve the settling and obtain good reduction of the dissolved organic matter. The mechanisms of ozone's action on the sludge is approached by the determination of byproducts: amino acids, sugars, phosphorus compounds.

ISSN:0191-9512    

DOI:10.1080/01919512.1994.10555748

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Concerns regarding bacteria in runoff entering Santa Monica Bay were validated by the isolation of human enteric virus in storm drain effluents. As an alternative to chlorination, ozonation was investigated for disinfection of dry-weather urban runoff. Ozone at 10-20 mg/L reduced coliform counts an average of 3.4-logs, with 6-log maximal disinfection. Although varying contaminant concentrations complicate the analyses, total organic carbon predicted ozone demand, and effluent coliform counts were correlated with ozone residuals.

ISSN:0191-9512    

DOI:10.1080/01919512.1994.10555749

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Modelling the efficiency of ozone disinfection in a bubble column was completed using two kinetic approaches: an axial dispersion model (ADM) and a back-flow cell model (BFCM). Using these models, the effects of flow directions and mixing on disinfection performance were examined. Both models predicted the concentration profiles of dissolved ozone in water equally well. However, the BFCM could be solved much more easily than the ADM with regard to the degree of inactivation without the solution being plagued by divergence.

ISSN:0191-9512    

DOI:10.1080/01919512.1994.10555750

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Bromate ion formation during ozonation processes in water works is regarded as an issue of great interest because of its potential for carcinogenicity. In this research, genotoxicity of bromate ion was investigated by theumu-test usingSalmonella typhimuriumTA 1535/pSK1002. The time-course study showed that theumuCgene related to error-prone repair of damaged DNA was induced by bromate ion after 12 hours exposure of the test strain. However, a further study revealed that this induction was inactivated by metabolism with rat liver microsome when bromate ion concentration was less than 0.88 mg BrO3−/mg as protein of the S9 fraction. This inactivation was assumed to depend on -SH compounds in liver microsome.

ISSN:0191-9512    

DOI:10.1080/01919512.1994.10555751

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0191-9512    

DOI:10.1080/01919512.1994.10555746

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor