DECRETO DE (Diciembre 30) Diario Oficial No. parcialmente la prevención y el manejo de los residuos o desechos peligrosos generados en el. Según el Decreto de , un Residuo o Desecho Peligroso es aquel residuo sistema de gestión de residuos peligrosos generados en la Universidad. Teniendo en cuenta el decreto del del manejo de Residuos Peligrosos (RESPEL.) responda las siguientes preguntas y enviar sus respectivas.
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A considerable amount of suspended solids were observed during this experiment. After this time, Cr concentration became less than 0.
COD analysis is often carried out in environmental labs. These bricks were subjected to mechanical resistance and leaching tests to identify if they obey quality and environmental standard. Construction and Building Materials. The methodology proposes a sequence of chemical reactions in which heavy metals are eliminated as hazardous solid residues; this is supported by previous results regarding the selective precipitation of Cr, Ag and Hg ions and assessed through lab experiments leading to establishing optimal dosage and settling time.
Final Cr III concentration in the jar test after 1 hour of precipitation was less than 0. Ag and Cr determination was carried out by flame atomic absorption spectrometry and mercury was determined by the cold vapour technique. Reduction-precipitation is a physicochemical treatment process based on the formation of a sparingly soluble molecule due to very low Kps values Teg Leong et al. Results revealed that biosorbent dosage was the parameter that most contributed adsorption process.
The sludge generated during Ag and Hg precipitation had pH lower than 2, these being toxic and corrosive characteristics of COD residue. The liquid residues from COD analysis used in this study were obtained from the Universidad del Valle’s Sanitary and Environmental Engineering Department’s environmental technology lab sample 1watier and environmental residues lab sample 2 and environmental chemistry lab sample3. Effect of pH and particle size for lead and nickel uptake from aqueous solution using cassava Manihot esculenta and yam Dioscoreaalata residual biomasses modified with titanium dioxide nanoparticles.
L -1 of NaCl independently of initial Ag concentrations. L -1, in a 60 minute reaction time.
Chemical modification and desorption studies. The cost involved in the chemical treatment can become significantly reduced by using readily available reactants due to their common use in chemical analysis. L -1required 50 minutes time to obtain a similar reduction.
Its wastes are considered hazardous due to the content of metals such as Cr, Ag and Hg; treating these wastes is considered complex and expensive.
How to cite this article. Once chromium had been reduced, 2 g of sodium chloride NaCI per litre of residue was added to the solution and stirred for 10 minutes.
All the experiments were carried out with constant stirring to guarantee good mixing in the reaction vessel.
The supernatant from the Hg precipitation experiment was subjected to Cr III precipitation at different dilutions 1: L -1respectively. L-1 of glucose to Cr III. After stirring up the sample, the residuox sludge volume was measured with an Imhoff cone and the supernatant was measured for final Ag concentration. L -1 by adding 10 g FeS er litre of residue and 24 h o precipitation i.
Mercury precipitation Hg 10 g of iron sulphide FeS per litre of residue was added to the free Ag ions in the supernatant. Adsorption is considered a promising technique to remove these re from aqueous solution. The mixture was stirred for 2 h, precipitated sludge volume was measured with an Imhoff cone and the supernatant was measured for final Hg concentration.
Glucose added as easily oxydable organic material allowed reducing Cr VI to less than 0. This precipitation takes place at pH values lower than 3 and produces hydrogen sulphide H 2 S which is volatile, toxic, corrosive and has a strong odour Holm, Glucose solution dosages of 20, 50,and mg L -1 were added to mL volume of COD residue sample. Journal of Functional Foods. Precipitation tests with ferric chloride FeCl 3 were carried out peligrosks improve the quality of the supernatant and decrease precipitation time.
L -1 Cr VI concentration was obtained for sample 1 in 33 minutes Ag and Hg ions were precipitated to obtain concentrations less than 0. Adsorption kinetics of Cr VI using modified residual biomass in batch and continuous system.
Biosorption and biotrans formation of hexavalent chromium [Cr VI ]: The increase in Fe concentration during Hg precipitation as observed in Figure 5 was related to the reactive used to precipitate Hg. Co-precipitation of Fe and Cr III residuow NaOH and FeCl 3 The filtrated upper layer from the mercury precipitation, diluted with the optimal ratio found in the previous experiment, was subjected to a jar test to determine optimal FeCl 3 dosage.
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