摘要:

The responses of fecal coliforms and multiple‐antibiotic‐resistant (MAR).Escherichia colito incremental doses of ozone were examined in three batches of activated sludge effluent from the same plant. The dose‐response function of fecal coliforms resembled the “breakpoint”; response typical of ozone disinfection of polluted waters. A logit model adequately described the dose‐response function after the breakpoint. The MARE. colidisplayed random variation throughout the entire range of applied ozone doses. It was concluded that the ozone dose had no apparent effect on the antibiotic‐resistance profile of wastewater.

ISSN:0143-2060    

DOI:10.1080/09593338709384458

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Sediment samples are pre‐treated with acid, mixed with silica and Soxhlet‐extracted with benzene/hexane. Humic substances and elemental sulfur are removed by passing the extract through a Chromatographie column containing basic alumina on which sodium sulfite and sodium hydroxide were adsorbed. After silica fractionation the concentrations of PAH's, PCB's and chlorinated pesticides are determined gas chromatographically. Recovery experiments with added standards gave recoveries of between 90% and 102%.

ISSN:0143-2060    

DOI:10.1080/09593338709384459

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Biofilms from anaerobic fixed film reactors (anaerobic filter, upflow anaerobic sludge blanket, and anaerobic fluidized bed) developed under identical experimental conditions, were characterized in terms of chemical, microbiological, and morphological composition. Using Scanning Electron Microscopy (SEM), the nature of the biofilms are described. Factor 420 analysis showed the fluidized bed to have the highest level of the coenzyme. However, factor 420 levels were not related to COD removal or gas production. Large amounts of inorganic matter were found in each of the biofilms.

ISSN:0143-2060    

DOI:10.1080/09593338709384460

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

This paper presents the evaluation of an anaerobic fluidized bed reactor for the treatment of effluent of a tapioca plant. The volume of the reactor was about 40 liters; actived carbon was used as support of bacteria. The influent had 6,4 kg m‐3COD and contained 4,4 kg m‐3suspended solids (SS). The hydraulic retention time varied from 5 to 29 hours. The values of efficiency varied from 57.9 to 88.3%COD for an average yield of biogaz of 2.2 to 6.5, i.e. in the range of 0.355 to 0.54 m3biogaz kg‐1COD.

ISSN:0143-2060    

DOI:10.1080/09593338709384461

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The paper records the results of investigations of Lead content in soil in the neighbourhood of the Domestic Glassware Plant “Irena”; in Inowroclaw. A considerable degree of contamination with lead of the surface layers of soul in the close vicinity of the emission source has been found, exceeding the average content of this element in unpolluted soils by the ten‐ to twentyfold and up to some dozens of times. The existence of a statistically significant dependence between the lead content in the soil and the sampling depth as well as the distance of the sampling points from the glassware plant has been demonstrated‐ The forms of chemical binding in the soil and the kinetics of lead dissolution in solutions are described. On the basis of the investigated results attempt has been made to evaluate the noxiousness of the emitted dusts to the natural environment.

ISSN:0143-2060    

DOI:10.1080/09593338709384462

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A multi‐stage biological process is described for treating effluents containing high levels of calcium sulphate, soluble organic matter and. heavy metals. Sulphate is reduced anaerobically to sulphide which is used to precipitate heavy metals, while the remaining H2S is stripped off. Residual soluble organic matter from the first stage is removed aerobically in a second stage. Effluent saturated with respect to calcium sulphate required 3 g molassesl‐1effluent to convert 90% of the influent sulphate to sulphide.

ISSN:0143-2060    

DOI:10.1080/09593338709384463

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Anaerobic degradation of 2‐, 3‐, and 4‐chlorophenol, with and without phenol supplementation, was investigated. 2‐Chlorophenol was readily degraded and mineralized at concentrations as high as 285 mg L‐1. However, 3‐ and 4‐chlorophenol were only degraded after very long acclimation times. Concentrations >30 mg L‐1of 3‐or 4‐chlorophenol inhibited ultimate phenol degradation whereas concentrations of 2‐chlorophenol < 97 mg L‐1were not inhibitory to ultimate phenol degradation. Semi‐continuous cultures demonstrated degradation of 2‐chlorophenol at 100 mg L‐1with methane production.

ISSN:0143-2060    

DOI:10.1080/09593338709384464

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

X‐Ray fluorescence is an useful method for quantitative analyses of aerosol assuming the thin layer hypothesis. Analytical results by this method for three standards are compared to reference values. A good agreement is obtained when the thin layer condition is met. In a second step, the range of application of this method for some elements is determined by studying thickness and grain size effects.

ISSN:0143-2060    

DOI:10.1080/09593338709384465

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Two rotating biological contactors (RBC) were operated according to a sequencing batch reactor (SBR) strategy. The reactor basins were periodically filled and drained. A thin biofilm developed in the reactor in which the substrate concentation was maintained at a relatively low level (slow fill strategy). In contrast, a very voluminous biofilm developed, and sloughing occured in the reactor in which the substrate concentration was allowed to increase rapidly (fast fill strategy). It is concluded that periodic changes of the substrate concentration are to be minimized in order to enable exploitation of the capacity of biofilm reactors.

ISSN:0143-2060    

DOI:10.1080/09593338709384466

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The musty odor producing microorganisms, the musty odor compounds and several environmental factors relating to the musty odor occurrence in Lake Kasumigaura were determined. When the musty odor occurred in the water of Tsuchiurairi site in October 1984, 2‐methylisoborneol was detected in the sediment with high actinomycete numbers. Moreover, a remarkable increase of carbohydrate was found in the sediment. Musty odor producing potential of sediment using actinomycetes was very high at the odor occurrence. It seemed that the investigation of actinomycete numbers and carbohydrate content in the sediment was important for the prognostication of the musty odor occurrence in Lake Kasumigaura.

ISSN:0143-2060    

DOI:10.1080/09593338709384467

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor