Percorrer por autor "Vertonha, Maria Thais"
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- Heavy metals removal of leachates from a mechanical biological municipal solid waste treatment plant for use as fertilizersPublication . Cardoso, Jonathan; Vertonha, Maria Thais; Roman, Fernanda; Silva, Adriano S.; Díaz de Tuesta, Jose Luis; Brito, Paulo; Gomes, HelderLeachates produced from treatment plants contains carbon, nitrogen, phosphorus, potassium and trace elements. This work aims to develop heavy metals removal processes using solid adsorbents synthetized at CIMO and LSRE-LCM laboratories at Polytechnic Institute of Bragança, such as activated carbon produced from a compost material from the same treatment plant and modified clays obtained through a partnership with a Kazakhstan institution, to adequate the leachate from the composting line of a mechanical and biological treatment facility, into commercial fertilizers which fit the requirements of the European Legislation. Preliminary results show that the adsoption materials promoted a reduction in the heavy metals content, but this reduction also affected the organic carbon content. However, the activated carbons presented a better potencial for heavy metals removal.
- Heavy metals removal of leachates from a mechanical biological municipal solid waste treatment plant for use as fertilizersPublication . Cardoso, Jonathan; Vertonha, Maria Thais; Roman, Fernanda; Silva, Adriano S.; Díaz de Tuesta, Jose Luis; Brito, Paulo; Gomes, HelderLeachates produced from treatment plants contains carbon, nitrogen, phosphorus, potassium and trace elements. This work aims to develop heavy metals removal processes using solid adsorbents synthetized at CIMO and LSRE-LCM laboratories at Polytechnic Institute of Bragança, such as activated carbon produced from a compost material from the same treatment plant and modified clays obtained through a partnership with a Kazakhstan institution, to adequate the leachate from the composting line of a mechanical and biological treatment facility, into commercial fertilizers which fit the requirements of the European Legislation. Preliminary results show that the adsoption materials promoted a reduction in the heavy metals content, but this reduction also affected the organic carbon content. However, the activated carbons presented a better potencial for heavy metals removal.
- Heavy metals removal on leachate for use as fertilizersPublication . Cardoso, Jonathan; Vertonha, Maria Thais; Cabral, David; Silva, Adriano S.; Roman, Fernanda; Díaz de Tuesta, Jose Luis; Arrobas, Margarida; Brito, Paulo; Gomes, HelderMunicipal landfill leachates typically contain high ammonium and organic concentration which could contribute to its use in agriculture, leading to the reduction of costs for the respective waste treatment plants. However, due to the nature of the leachates, they may contain phytotoxic substances. The landfillleachate samples differ by many factors such as the composition of the treated waste, elapsed time, geochemical and weather conditions [1-3]. Taking into account these considerations, leachate samples from a storage tank at the "Residuos do Nordeste, ElM" mechanical and biological treatment plant, were collected in February 2019, and stored :at 4°C. The leachate samples were processed using activated carbon adsorbents produced from the compost of the referred company, and H2S04 activated clays obtained from a partnership with a Kazakhsta1n institution. The leachate samples were mixed with the adsorbents for 48 hours, centrifugated and the supernatant was reserved. TOC analysis in a Shimadzu TOC-L equipment and metals quantification by atomic absorption spectroscopy using a Varian SpectrAA 220 apparatus were carried out. :Selected results are presented in Fig. 1. The original leachate presents an organic carbon content closer to the requirements of the EU legislation for liquid organo-mineral fertilizers. The activated carbon promoted greater TOC removal in comparison with the activated clays. Both materials showed interaction with the heavy metals. However, Cr still remains present in higher conten1ts and K presents lower values than the legislation requirements. Overall, the activated carbons presented a greater potential for heavy metals removal. However, ion-exchange resins will be tested for a more efficient heavy metals removal to minimize possible secondary elimination of components sue:h as nutrients and organic carbon.
- Potential use of leachates from a mechanical biological municipal solid waste treatment plant as fertilizersPublication . Cardoso, Jonathan; Vertonha, Maria Thais; Mees, Juliana B.; Brito, Paulo; Gomes, HelderLeachates produced from treatment plants contains carbon, nitrogen, phosphorus, potassium and trace elements. This work aims to assess if a leachate, generated from a mechanical and biological treatment of compost, can be used as a potential source for fertilizers, and thus develop and design a sequence of processes which could effectively convert the leachates to commercial fertilizers according to the requirements of the proposal of regulation of the European Parliament of 2016. The analysis shows that the leachate could result in an organo-mineral fertilizer with high organic carbon content. However, some heavy metals, nitrogen and phosphorous contents do not fulfill the legislation requirements, and potassium content remains to be characterized.
- Potential use of leachates from a mechanical biological municipal solid waste treatment plant as fertilizersPublication . Cardoso, Jonathan; Vertonha, Maria Thais; Mees, Juliana B.; Brito, Paulo; Gomes, HelderLeachates produced from treatment plants contains carbon, nitrogen, phosphorus, potassium and trace elements. This work aims to assess if a leachate, generated from a mechanical and biological treatment of compost, can be used as a potential source for fertilizers, and thus develop and design a sequence of processes which could effectively convert the leachates to commercial fertilizers according to the requirements of the proposal of regulation of the European Parliament of 2016. The analysis shows that the leachate could result in an organo-mineral fertilizer with high organic carbon content. However, some heavy metals, nitrogen and phosphorous contents do not fulfill the legislation requirements and potassium content remains to be characterized.
- Remoção de metais pesados em lixiviados para uso como fertilizantesPublication . Cardoso, Jonathan; Fernández-Delgado, Marina; Vertonha, Maria Thais; Cabral, David; Silva, Adriano S.; Roman, Fernanda; Díaz de Tuesta, Jose Luis; Arrobas, Margarida; Brito, Paulo; Gomes, HelderThe aim of this work is to offer a sequence of processes to convert leachate liquid stream with a highly variable composition, collected from the composting line of a mechanical and biological treatment facility, into commercial fertilizers, which fit the composition requirements of the European Legislation. The leachate was first characterized by total organic carbon (TOC), density, fixed and volatile solids, nutrients as organic and ammoniacal nitrogen, phosphorus, potassium, and heavy metals content, to verify the accordance with the European Legislation for fertilizers. The preliminary characterization showed that the leachate contains low levels of organic and ammoniacal nitrogen and phosphorus but high contents of potassium and TOC, which are interesting to fertilizing purposes, and chromium, which needs to be removed to fit the specifications. To chromium removal, some adsorbents materials were proposed: activated carbon produced from the compost of the referred company and acid activated clays obtained from a partnership with a Kazakhstan institution. The results after the adsorption process showed an interaction between the adsorbents and TOC, which was not intended, and a reduction in the heavy metals content, more efficient for Pb, Cd, Zn and Cu, but less for Cr removal. For future work, the study of the use of ionic resins was proposed through the development of an experimental design, in order to obtain the optimized parameters for the minimization of TOC loss, and promotion of heavy metals removal, especially chromium, using a response surface methodology.
- Use of leachates from a mechanical biological municipal solid waste treatment plant as fertilizersPublication . Cardoso, Jonathan; Vertonha, Maria Thais; Mees, Juliana B.; Díaz de Tuesta, Jose Luis; Brito, Paulo; Gomes, HelderLeachate liquid streams originated from treatment plants contain carbon, nitrogen, phosphorus, potassium and trace elements. The present work aims to assess if a leachate, generated from a composting line of a mechanical and biological treatment facility, can be used as a potential source for liquid fertilizers, and thus propose and design a sequence of processes which could effectively convert the leachates to commercial liquid fertilizers according to the requirements of the proposal of regulation of the European Parliament of 2016 [1], [2]. The analysis shows that the leachate exhibits potential to be converted in an organo-mineral fertilizer, since it exhibits high organic carbon content. However, some heavy metals and nitrogen and phosphorous nutrient contents do not fulfill the legislation requirements which implies a tuning of the liquid waste composition.
- Use of leachates from a mechanical biological municipal solid waste treatment plant as fertilizersPublication . Cardoso, Jonathan; Vertonha, Maria Thais; Mees, Juliana B.; Díaz de Tuesta, Jose Luis; Brito, Paulo; Gomes, HelderLeachate liquid streams originated from treatment plants contain carbon, nitrogen, phosphorus, potassium and trace elements. The present work aims to assess if a leachate, generated from a composting line of a mechanical and biological treatment facility, can be used as a potential source for liquid fertilizers, and thus propose and design a sequence of processes which could effectively convert the leachates to commercial liquid fertilizers according to the requirements of the proposal of regulation of the European Parliament of 2016. The analysis shows that the leachate exhibits potential to be converted in an organo-mineral fertilizer, since it exhibits high organic carbon content. However, some heavy metals and nitrogen and phosphorous nutrient contents do not fulfill the legislation requirements which implies a tuning of the liquid waste composition.
- Valorization of leached waters through conversion in liquid fertilizersPublication . Vertonha, Maria Thais; Brito, Paulo; Gomes, Helder; Mees, Juliana B.An unprecedented demographic explosion occurred in the last decades at a global level. The negative impacts of this event stand out, affecting the social, economic and mainly environmental spheres. In the environmental aspect, an important consequence is the growing production of solid wastes, due partially to the population increase. However, the development of effective technologies for the treatment of these wastes did not accompany such growth, and currently the most used method for this is landfill disposal. Even with the possibility of alternatives, the use of landfills for the disposal of solid wastes will be necessary over a long period, with the inevitable consequence of the generation of leachate streams. The objective of this work is the development, design and implementation of processes for physicochemical conversion of leachate liquid effluents from a composting process in liquid fertilizers with a standardized and reproducible composition. The leachate sample was collected in February 2019 from the slurry storage tank of the company “Resíduos do Nordeste”, EIM (Urjais, Mirandela, Portugal). The stream is produced and recovered from a composting line from a mechanical and biological waste treatment plant. From this original sample, three additional materials were obtained: a filtered sample for the removal of the solid fraction (Filtro 03/04), two concentrated samples by simple distillation, with two concentration levels in volume basis: 1,19x and 1,85x in relation to the original leachate sample. The four samples (the original leachate and the three processed samples) were submitted to a sequence of analyzes, in order to compare its composition and properties with the current Portuguese and European legislation specifications for liquid fertilizers. The selected characterization parameters were: Total Organic Carbon (TOC), pH, Conductivity, Percentage of Dry Matter, Density, and Heavy Metals, Phosphorus, Potassium and Nitrogen contents. Adsorption tests were performed with the Filter 03/04 sample, with two adsorbents of different origin, the first produced from an organic compound, resulting from a centralized composting process, obtained from the same landfill that provided the Original sample. The second adsorbent tested is activated clays, originating from four different deposits in Kazakhstan. After treatment with the adsorbents, the same analyzes were performed previously, aiming to evaluate the efficiency of the adsorbents. The characterization results were then used to verify the framework for later use of the original leachate and/or the processed samples as liquid organomineral fertilizers, and to assess the specific needs of composition tuning for the non-processed leachate sample. A concentration process for the original sample of 1,19x (v/v) has been determined to allow the reaching of at least 3% TOC, a content legally required. Additionally, treatment is required for the removal of nickel and chromium from the samples. The metals zinc, copper, cadmium and lead have been quantified and are within the limits specified in the Regulation of the European Parliament and of the Council (2019). A flowchart for the proper treatment of this leachate was proposed, with the intention of using it as liquid organomineral fertilizer.