ISSN:0191-9512    

DOI:10.1080/01919518608552408

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A linear isotherm model, modified to account for a non-adsorbable fraction, was found to fit adequately the adsorption equilibrium of organic matter from a tertiary treated wastewater. The isotherm slope varied significantly among sample days, but the range of variability did not exceed a factor of two. A moderate ozone dose (0.5 g O3/g DOC) enhanced adsorbability in both laboratory and full-scale systems, whereas higher doses appeared to decrease adsorption. Preozonation had little effect on the nonadsorbable portion of DOC.

ISSN:0191-9512    

DOI:10.1080/01919518608552409

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Performance data for GAC columns treating surface water are analyzed to determine the relative importance of physical adsorption and biological activity, with and without pre-ozonation. Kinetic and equilibrium adsorption parameters for the source water are used in the Homogeneous Surface Diffusion model to predict GAC performance over 83 weeks. The model underestimates removal of TOC for ozonated and unozonated streams by 46% and 28%, respectively, which is attributed to omission of biological removal in the model.

ISSN:0191-9512    

DOI:10.1080/01919518608552410

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Measurement of the 254 nm absorption of organics was chosen for monitoring the ozonation processes used to remove organic matter in a drinking water because of its ability to reflect the performance of ozonation. Ozone flow rate, ozone concentration in the gas (phase, addition of H202and seasonal variations on kinetics of the reduction of UV absorption were varied and the efficiency of ozonation was determined. For several yearst ozonation has been applied at different points in potable water treatment. The original goal of ozonation was reduction in taste and odor and disinfection without by products of organoleptic concern (e.g.. chlorophenols). Ozone also has the capacity to oxidize organic matter.

ISSN:0191-9512    

DOI:10.1080/01919518608552411

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

1,2–Dichloroethane (DCE) and trichloroethylene (TCE) were used as model compounds to study the oxidation of organic chemicals by ozone/ultraviolet radiation, ozone, and hydrogen peroxide/ultraviolet radiation. It was found that ozone/ultraviolet radiation oxidized both 1,2–dichloroethane and trichloroethylene in batch systems, at pH = 2 (phosphate buffer). At ozone concentrations in the 1 to 5 mg/L range, the reaction was first order in both ozone and substrate. At pH = 2 and initial ozone concentration 2.2–2.6 mg/L, rate constants (k)Q = 25 and 130 M-1sec-1were observed for the ozone/ultraviolet radiation oxidation of DCE and TCE, respectively. The rat e constants for ozone oxidation of DCE and TCE without ultraviolet radiation were 4.3 and 47 M-1sec-1, respectively.

ISSN:0191-9512    

DOI:10.1080/01919518608552412

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The effect of preozonation on activated sludge effluent before activated carbon treatment was evaluated in terms of its effect on the adsorption process. It was found that the total removal of organic substances by the combined action of ozone and activated carbon was superior than by either ozone or activated carbon separately. Although ozonation leads to a decrease in the adsorbability of organic substances, the overall removal of organic substances is not impaired except during the early stages of operation before an effective biogrowth is established. Preozonation extends the operational life of activated carbon. This is explained, in part, by improved desorption and biodegradation of the adsorbate.

ISSN:0191-9512    

DOI:10.1080/01919518608552413

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor