ABSTRACT
The dyestuff manufacturing and textile industries consume a high volume of water and produce a great amount of wastewater containing various toxic substances. Different methods are used to remove dye compounds from wastewaters. Removal of dyes from water by adsorption processes received considerable attention and a number of studies focused on the adsorption of some dyes by non-conventional low cost and effective adsorbents. In this study, the suitability of the canola stalks for acid orange 7 adsorption was assessed. The dry canola stalks obtained from the research farm were milled and screened and the particles size ranged between 0.4-0.7 mm were used in all experiments. Acid orange 7 supplied by Alvan Sabet. Initially, the effects of initial dye concentration, pH and temperature on adsorption were examined. The kinetic and equilibrium data obtained for various concentrations of evaluated on the basis of Langmuir and Freundlich isotherms. The results showed that the absorption efficiency depended strongly on pH and slightly on the temperature. Absorption of acid orange 7 on ne canola stalks was fairly rapid and more than 95% of adsorption occurred within the initial 5 minutes of the treatment. Both Langmuir and Freundlich models were applicable for the description of acid orange 7 dye adsorption by canola stalks. According to the Langmuir model, the highest capacity of canola stalks for acid orange 7 adsorption was found 24.8 mg/g which was higher than the capacity of beech wood sawdust and soil mixture with fly ash
Subject(s)
Coloring Agents , Water Purification , Azo CompoundsABSTRACT
Mutagenic activity of ethanolamine mono-and dichloramines, histamine mono and dichloramines, and taurine mono- and dichloramines was studied in vitro using the S.tvphimurium strains TA 98 and TA 100. TA 100 was the most sensitive strain to mono-and dichloramines, and, when incubated the most active mutagens were ethanolamine and histamine dichloramines. Chloramines such as taurine mono or dichloramines were inactive. Glucose metabolism of the bacteria was critical to determine the mutagenicity. Chloramines were mutagenic when added to bacteria with glucose at 37°C, but killing predominated when chloramines were added at 4°C or 15°C, or at 37°C without glucose
Subject(s)
Chloramines , MutagensABSTRACT
The effects of recombinant erythropoietin on Haemostasis were studied in 5 patients with end stage renal disease maintained on haemodialysis. Results showed significant shortening of the bleeding time together with an increase in the levels of both factors II and X. No changes were observed in the natural anticoagulants, Protein C, Protein S, Anti-thrombine III, and the fibrinolysis inhibitors