ISSN:0191-9512    

DOI:10.1080/01919512.1979.10684565

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Ozone and chlorine inactivation curves were determined in three types of freshwater at 20 C for the destruction of the fish pathogensAeromonas salmonicidathe etiologic agent of furunculosis, andYersinia ruckerithe enteric redmouth bacterium (ERM). Ozone and chlorine inactivation curves were also obtained in the same water types at 10 C for the fish pathogenic viruses infectious hematopoietic necrosis (IHNV), and infectious pancreatic necrosis (IPNV). Acute toxicity tests using the rainbow trout as a representative salmonid revealed that ozone was highly toxic at the dose levels used. Partial chronic (3. mo.) testing revealed that ozone exposure at 2 μg/L causes only minimal physiological changes, none of which would be expected to compromise biological function.

ISSN:0191-9512    

DOI:10.1080/01919512.1979.10684566

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The elimination of toxic wastes is necessary in an intensive fish culture operation. Many methods employing biological filtration have been explored and the conclusion reached that biological filtration alone is insufficient to ascertain a water supply of suitable quality. A recycling system which employs ozone for the culture of fish is described.

ISSN:0191-9512    

DOI:10.1080/01919512.1979.10684567

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Studies to determine the feasibility of using ozone to disinfect seawater for use in controlled environment shrimp culture were run at the University of Arizona University of Sonora Environmental Shrimp Culture Station at Puerto Peñasco, Mexico. Ozone was injected into seawater containing known natural populations ofVibriospp. and known introduced populations ofFusarium solani. Total residual oxidant (TRO) concentrations and total viable plate counts for these pathogens were made during and post ozonization. TRO at a concentration of 2.6 mg/l was sufficient to kill greater than 99.9% of theVibriospp. present in the seawater within a 5-min exposure period. Greater than 99.9% of the introduced conidiospores ofF. solaniwere killed within 5 minutes after exposure to approximately 2.1 mg/l TRO.

ISSN:0191-9512    

DOI:10.1080/01919512.1979.10684568

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Disease transmission via the aquatic route, including recreational water, drinking water, and seafood from polluted water, has been and continues to be a problem. The primary objective of the research study reported herein is to evaluate the feasibility of ozone for disinfection under stringent bacteriological standards that may be required for wastewater discharges in or near shellfish waters. The factors influencing ozone disinfection to high levels along with high level disinfection data obtained from full-scale pilot facilities are discussed.

ISSN:0191-9512    

DOI:10.1080/01919512.1979.10684569

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Part I of this study describes the results of ozonation and biodegradation studies on three different types of water samples. The results indicate that ozonation improves the biodegradation of the organics in these samples. Part II describes activated carbon adsorption studies on one type of the water sample, the water collected from a river containing organics originating from human activities as well as natural vegetative degradation. Activated carbon adsorption isotherms were obtained before and after ozonation and after biodegradation. These showed that ozonation does not change, consistently, the adsorptivity of organics, however, biodegradation markedly improves adsorptivity. Continuous column studies indicate that granular carbon adsorption removes Total Organic Carbon according to the adsorptive equilibrium indicated by the isotherm studies and preozonation was shown to have little effect on organic removal. Activated carbon is also shown to be an excellent adsorbent for organic halogens and polycyclic aromatic hydrocarbons. A shock loading of orthochorophenol is shown to be adsorbed completely after the adsorbents appeared to reach adsorptive saturation by non–halogenated organics.

ISSN:0191-9512    

DOI:10.1080/01919512.1979.10684570

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

In order to transfer experience from one waterwork to another, it is helpful to know (i) the spontaneous ozone requirement, (ii) the lifetime of the ozone, and (iii) the oxidation efficiency of the secondary oxidants derived from decomposed ozone (OH* radicals) in the different waters. The spontaneous ozone requirement of surface and ground waters (0.1 to 1 mg/l) and the lifetime of the ozone (30 to 2,000 sec at pH 8) can easily be measured. The effect of the secondary oxidants (OH* radicals) can best be characterized by following the elimination rate of the individual suitable referenced micropollutant as a function of the amount of ozone decomposed. This way the “Oxidation-Competition Value”, Ω, of the water can be determined. This Ω is a linear sum of the concentrations of all impurities which consume OH* radicals, multiplied by the individual “Oxidation-Competition Coefficient.” The Ω values have been determined for 40 different types of waters. For the elimination of benzene (reference solute) to its 37% value, the required amount of ozone decomposition (e.i. Ω {benzene}) varied in lakewater from 0.5 mg/l (mesotrophic lake) to 2.2 mg/l (highly eutrophic lake) and in groundwater from 0.3 mg/l (soft mountain groundwater) to 2 mg/l (medium loaded groundwater).

ISSN:0191-9512    

DOI:10.1080/01919512.1979.10684571

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0191-9512    

DOI:10.1080/01919512.1979.10684564

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor