摘要:

The two 125-mgd oxygen activated sludge wastewater treatment plants for the City of Indianapolis, Indiana use ozone disinfection. The process was constructed in 1983, and has maintained continuous, reliable operation since 1985. Disinfection is required at Indianapolis from April 1 through October 31. Equipment performance characteristics were evaluated during the 1985 disinfection season, and disinfection performance characteristics were optimized during the 1986 season. The evaluation documents the effect of cooling water temperatures on equipment performance, and the utilization of ozone contactor off-gas control of disinfection performance. The capital cost of both ozone systems represented about eight percent of the plants' total construction cost. The ozone system O & M cost represents about 1.9 percent and 3.7 percent of the total plant O & M cost at the Belmont and Southport plants, respectively.

ISSN:0191-9512    

DOI:10.1080/01919518808552255

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

In laboratory testing as well as in tests using a semi-technical plant it was found that removal of the gaseous N2O5as a by-product of ozone generation from air can be realized from a chemical point of view by gas scrubbing using treated drinking water, and forming nitric acid. At the same time this measure accomplishes a reduction of the trichloronitromethane (TCNM = chloropicrin) concentration in the treated water from Lake Constance by 30%. Surprisingly it was also found that the material used herein (stainless steel DIN 1.4571) will be attacked under conditions such as these.

ISSN:0191-9512    

DOI:10.1080/01919518808552256

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

At 600 mgd (2,270 ML/day), the recently completed Los Angeles Aqueduct Filtration Plant (LAAFP) is one of the world's largest water' treatment facilities utilizing ozone for pretreatment. The treatment process features direct filtration at rates of up to 13.5 gpm/ft2(33 m/h). Under the optimized full-scale operation, preozonation has resulted in significantly reduced THM levels and very low effluent turbidity with low operating costs.

ISSN:0191-9512    

DOI:10.1080/01919518808552257

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

It was demonstrated that, in natural waters, the overall kineticsof dissolved ozone consumption can be characterized by the “specific ozone utilization rate”,w[time−1]. The dependency ofwon the chemical quality of the raw water was analyzed. And, the variation ofwvalues measured in different water samples was explained in terms of the pH, alkalinity, and total organic carbon content of the solution matrix.

ISSN:0191-9512    

DOI:10.1080/01919518808552258

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Poor sludge settleability is a problem encountered in many activated sludge wastewater treatment plants. This study was aimed at combatting the unwanted biological growths at the root of this phenomenon with ozone. Ozone dosed directly into the aeration basins of small activated sludge pilot plants treating both domestic and synthetic fuel wastewaters led to a substantial reduction of the bulking problem even at dosages as low as 6 to 10 mg/L. Ozone did not interfere in the delicate nutrient removal processes and significantly enhanced effluent quality.

ISSN:0191-9512    

DOI:10.1080/01919518808552259

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

In Japan, ozone is used for potable water treatment, night soil and industrial wastewater treatment, and for offensive gas treatment at sewage and night soil treatment plants. This paper describes its implementation, and presents experimental findings of the combined ozone and ultraviolet radiation as a new ozone utilization technology.

ISSN:0191-9512    

DOI:10.1080/01919518808552260

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Mass transfer of ozone and oxygen to water was investigated both in pilot plant countercurrent bubble column and in a Rushton type laboratory stirred reactor supplied with a variable speed turbine agitator. A comparison was made for different hydrodynamic conditions with the main task of developing an engineering approach for determination of the physical volumetric mass transfer coefficient (KLoa), specific interfacial area (a), and physical masstransfer coefficient (KLO). The mass transfer characteristics of ozone and oxygen can be determined quickly in a pilot plant or laboratory apparatus, and employed to optimize the performance ofthe full scale water treatment plant.

ISSN:0191-9512    

DOI:10.1080/01919518808552261

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0191-9512    

DOI:10.1080/01919518808552254

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor