A detailed study regarding the optimization of a complete system for the purification of water waste is presented.Three main concerns are addressed:the nature of the absorbing material,the efficiency dependence on sca...A detailed study regarding the optimization of a complete system for the purification of water waste is presented.Three main concerns are addressed:the nature of the absorbing material,the efficiency dependence on scale and the management of the final waste of the assembly.These three points have to be optimized in the best acceptable way from an environmental point of view.Subsequently,the wet filling material,comprised of the absorbent and the absorbed dye,was buried in dry soil,promoting soil bacterial and fungal growth.The absorbance of CO2 was determined.The use of natural vegetative material as absorbents of chemical dyes in industrial water waste is an environmentally friendly solution.Combination with the utilization of the final solid waste as fertilizer is an optimum solution,promoting sustainability within an industrial ecology framework.The adsorption column scale-up studied herein,for the removal of basic dyes from wastewaters,using methylene blue as a representative adsorbate and barley straw as a representative waste biomass adsorbent,was successful,as regards consistency and reliability(judged by low absolute and relative standard deviation)of results.展开更多
This paper reports the practicability of using coffee residues to remove widely used basic dyes like MB （Methylene Blue） from wastewaters. The effect of different batch system parameters, namely stirring speed, pH, ...This paper reports the practicability of using coffee residues to remove widely used basic dyes like MB （Methylene Blue） from wastewaters. The effect of different batch system parameters, namely stirring speed, pH, initial dye concentration and contact time were studied. Moreover, in continuous fixed-bed column systems, the effects of parameters such as bed-depth, flow rate and initial dye concentration were examined. The experimental batch systems data were simulated using （a） Freundlich, Langmuir and Sips isotherm models and （b） 1st order, 2nd order, and intra-particle kinetic models. The results revealed that the MB is fairly adsorbed on coffee residues. This process could be a low cost technique for the removal of basic dyes from aqueous systems.展开更多
This paper contributes to the Industrial Ecology Concept by using a common urban solid waste, i.e., coffee residues, to clean industrial wastewaters polluted by basic dyes, e.g., Methylene Blue. For the data from the ...This paper contributes to the Industrial Ecology Concept by using a common urban solid waste, i.e., coffee residues, to clean industrial wastewaters polluted by basic dyes, e.g., Methylene Blue. For the data from the continuous fixed-bed column system, two common models, namely （a） Bohart and Adams and （b） Clark were implemented. The Bohart and Adams capacity was up to N = 46,166 mg.L-1 or q0 = 104.5 mg.g-1 for bed-depth 15 cm, initial dye concentration 800 mg.g-1 and flow rate 20 mL.min-1. The results revealed that the Methylene Blue is fairly adsorbed on coffee residues. Consequently, this process can be applied as a low cost technique for cleaning basic dyes from the aquatic environment.展开更多
This work reports the practicability of using spruce to remove widely-used basic dyes, like Methylene Blue from wastewaters. In continuous fixed-bed column systems, the effects of parameters, such as bed-depth, flow r...This work reports the practicability of using spruce to remove widely-used basic dyes, like Methylene Blue from wastewaters. In continuous fixed-bed column systems, the effects of parameters, such as bed-depth, flow rate and initial dye concentration, were examined. The results revealed that the Methylene Blue is fairly adsorbed on spruce. This process could be a low-cost technique for the removal of basic dyes from aqueous systems.展开更多
In this work, the Holland＇s methodology is modified for the categorization of human personalities by including queries （in the corresponding questionnaire that serves as an evaluation tool） investigating its respon...In this work, the Holland＇s methodology is modified for the categorization of human personalities by including queries （in the corresponding questionnaire that serves as an evaluation tool） investigating its responders＇ attitude as regards his/her willingness to be professionally engaged with the natural or/and anthropogenic environment. The population used as representative sample consisted of 250 students following courses at high school and university level. The quantitative methods used were descriptive statistics, parametric and non-parametric statistics hypothesis （on causal relations） testing, categorical semantics, ontological mapping fuzzy sets and interval algebra. The results obtained showed relative significant internal consistency at macro-level for almost half of the interviewees, but the dependence of answers to environmental queries on the rest responds to the rest queries was insignificant, indicating lack of specific knowledge and clarification of the corresponding concepts at micro-level.展开更多
文摘A detailed study regarding the optimization of a complete system for the purification of water waste is presented.Three main concerns are addressed:the nature of the absorbing material,the efficiency dependence on scale and the management of the final waste of the assembly.These three points have to be optimized in the best acceptable way from an environmental point of view.Subsequently,the wet filling material,comprised of the absorbent and the absorbed dye,was buried in dry soil,promoting soil bacterial and fungal growth.The absorbance of CO2 was determined.The use of natural vegetative material as absorbents of chemical dyes in industrial water waste is an environmentally friendly solution.Combination with the utilization of the final solid waste as fertilizer is an optimum solution,promoting sustainability within an industrial ecology framework.The adsorption column scale-up studied herein,for the removal of basic dyes from wastewaters,using methylene blue as a representative adsorbate and barley straw as a representative waste biomass adsorbent,was successful,as regards consistency and reliability(judged by low absolute and relative standard deviation)of results.
文摘This paper reports the practicability of using coffee residues to remove widely used basic dyes like MB （Methylene Blue） from wastewaters. The effect of different batch system parameters, namely stirring speed, pH, initial dye concentration and contact time were studied. Moreover, in continuous fixed-bed column systems, the effects of parameters such as bed-depth, flow rate and initial dye concentration were examined. The experimental batch systems data were simulated using （a） Freundlich, Langmuir and Sips isotherm models and （b） 1st order, 2nd order, and intra-particle kinetic models. The results revealed that the MB is fairly adsorbed on coffee residues. This process could be a low cost technique for the removal of basic dyes from aqueous systems.
文摘This paper contributes to the Industrial Ecology Concept by using a common urban solid waste, i.e., coffee residues, to clean industrial wastewaters polluted by basic dyes, e.g., Methylene Blue. For the data from the continuous fixed-bed column system, two common models, namely （a） Bohart and Adams and （b） Clark were implemented. The Bohart and Adams capacity was up to N = 46,166 mg.L-1 or q0 = 104.5 mg.g-1 for bed-depth 15 cm, initial dye concentration 800 mg.g-1 and flow rate 20 mL.min-1. The results revealed that the Methylene Blue is fairly adsorbed on coffee residues. Consequently, this process can be applied as a low cost technique for cleaning basic dyes from the aquatic environment.
文摘This work reports the practicability of using spruce to remove widely-used basic dyes, like Methylene Blue from wastewaters. In continuous fixed-bed column systems, the effects of parameters, such as bed-depth, flow rate and initial dye concentration, were examined. The results revealed that the Methylene Blue is fairly adsorbed on spruce. This process could be a low-cost technique for the removal of basic dyes from aqueous systems.
文摘In this work, the Holland＇s methodology is modified for the categorization of human personalities by including queries （in the corresponding questionnaire that serves as an evaluation tool） investigating its responders＇ attitude as regards his/her willingness to be professionally engaged with the natural or/and anthropogenic environment. The population used as representative sample consisted of 250 students following courses at high school and university level. The quantitative methods used were descriptive statistics, parametric and non-parametric statistics hypothesis （on causal relations） testing, categorical semantics, ontological mapping fuzzy sets and interval algebra. The results obtained showed relative significant internal consistency at macro-level for almost half of the interviewees, but the dependence of answers to environmental queries on the rest responds to the rest queries was insignificant, indicating lack of specific knowledge and clarification of the corresponding concepts at micro-level.
