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RISS 인기검색어
- 검색키워드
- 저자 : Aiman Eid Al-Rawajfeh (검색결과 2 건)
- 무료
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Enhancement effect of phosphate and silicate on water defluoridation by calcined gypsum
Al-Rawajfeh, Aiman Eid,Alrawashdeh, Albara I.,Aldawdeyah, Asma,Hassan, Shorouq,Qarqouda, Ruba Techno-Press 2013 Advances in environmental research Vol.2 No.1
Research work on removal of fluoride from water, referred to as water defluoridation, has resulted into the development of a number of technologies over the years but they suffer from either cost or efficiency drawbacks. In this work, enhancement effects of phosphate and silicate on defluoridation of water by low-cost Plaster of Paris (calcined gypsum) were studied. To our knowledge, the influence of silicate on defluoridation was not reported. It was claimed, that the presence of some ions in the treated water samples, was decreasing the fluoride removal since these ions compete the fluoride ions on occupying the available adsorption sites, however, phosphate and silicate ions, from its sodium slats, have enhanced the fluoride % removal, hence, precipitation of calcium-fluoro compounds of these ions can be suggested. Percentage removal of $F^-$ by neat Plaster is 48%, the electrical conductance (EC) curve shows the typical curve of Plaster setting which begins at 20 min and finished at 30 min. The addition of phosphate and silicate ions enhances the removal of fluoride to high extent > 90%. Thermodynamics parameters showed spontaneous fluoride removal by neat Plaster and Plaster-silicate system. The percentage removal with time showed second-order reaction kinetics.
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CaCO3–CO2–H2O system in falling film on a bank of horizontal tubes: Model verification
Aiman Eid Al-Rawajfeh 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
The purpose of this work is to model the CaCO3–CO2–H2O system in falling film on a bank of horizontal tubes. The model was applied on a 5-effects reference thermal vapor compression multiple-effect distiller (MED-TVC) operating at top brine temperatures (TBT) of 60–70 8C. The model can predict pH values, CaCO3 deposition and fouling resistance with greater accuracy. Through the MED stages, the HCO3 and CO2 concentrations slightly increased while the CO32 concentration slightly decreased. The pH decreased from 8.8 in the first stage to 8.4 in the 5th stage. The CO2 release rates as well as the CaCO3deposition rates increase with increasing top brine temperature (TBT). CO2 release rates decrease from 36.4 g/t feed water in the first stage to 32.5 g/t in the last stage. The specific CaCO3 deposition decreases from 127.3 g/t feed water in the first stage to 100.1 g/t in the last stage. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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