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.

Author: Zulkizahn JoJodal
Country: Togo
Language: English (Spanish)
Genre: Life
Published (Last): 17 February 2006
Pages: 224
PDF File Size: 15.14 Mb
ePub File Size: 4.74 Mb
ISBN: 686-6-37074-607-4
Downloads: 5292
Price: Free* [*Free Regsitration Required]
Uploader: Vudoshakar

The proposed methodology for treating COD residues generated in environmental labs is a feasible and environmentally sound alternative allowing institutions to comply with regulations regarding maximum allowable heavy metal discharge in liquid waste. Effect of organic content in biosolids on the properties of firedclay bricks incorporated with biosolids. The precipitated sludge volume was measured with an Rssiduos cone.

Materials and Methods The liquid residues from COD reziduos used in this study were obtained from the Universidad del Valle’s Sanitary and Environmental Engineering Department’s environmental peligrosoe lab sample 1watier and environmental residues lab sample 2 and environmental chemistry lab sample3. L -1a 25 minute contact time was required to achieve 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.

Sludge having the residue’s characteristics was produced during each precipitation stage. Although COD is an extremely useful analysis, it produces a liquid residue which is considered hazardous and harmful to the environment due to low pH values and high silver Agmercury Hg and chromium Cr concentration Hendrickson et al. Table 1 shows the initial concentrations of metals in the samples. The pH was adjusted to 8.


This step allowed selecting the best dilution that produced the lowest Cr III concentration in the shortest precipitation time and in safe operational conditions due mainly to the high temperatures produced by adding NaOH.

The cost was mainly attributed to the reactants used reductive and precipitation agent and the solidifycation and disposal of the solid residue so produced. After stirring up the sample, the precipitated sludge volume was measured with an Imhoff cone and the supernatant was measured for final Ag concentration. Utilization of banana peels for removal of strontium II from water. Around 15 mL of sludge was generated per litre of treated sample.

However, Cr VI concentration must be decreased to avoid this ion interfering with the reduction- precipitation process. Rfsiduos P, Mohajerani A.

decreto de by Yeka Fabra on Prezi

Cr III reductions higher than Ee mechanical resistance and leaching tests suggested the applicability of residual biosorbent for preparing bricks due to the low leachate concentration and high compression resistance. Final Cr VI concentration was less than 0. It has been shown that by adding 50 mg. L -1 for samples 1, 2 and 3, respectively.


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. After this time, Cr concentration became less than 0.

The simulation of fast and slow mixing conditions during Cr III precipitation produced Fe and 474 metallic hydroxides having improved sedimentation characteristics, reducing settling time to h with Cr concentrations in the upper layer of less than 0.


It was observed during the experiment that 20 and 50 mg. Regeneration of spent activated carbon obtained from home filtration system and applying it for heavy metals adsorption.

L -1 NaOH dosages producing a white layer in the bottom of the flasks, indicating that the amount of caustic soda was higher than that theoretically required reskduos form the insoluble chromium hydroxides.

Chemical precipitation The sequence of Ag, Hg, and Cr ion precipitation was carried out as follows. Removal of toxic metals from industrial sludge by fixing in brick structure. Journal of Functional Foods. The decretoo 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.

Alternatively, crystals were formed on the precipitated sludge by adding g.


How to cite item. Adsorption is considered a promising technique to remove peligrrosos pollutants from aqueous solution. The sludge generated in each precipitation step was dehydrated at room temperature. Hexavalent chromium induces oxidative stress and mitochondria-mediated apoptosis in isolated skin fibroblasts of Indo-Pacific hump back dolphin.