114 documents found, page 1 of 12
Solar-driven thermo-photocatalytic CO2 methanation over a structured RuO2:TiO2/...
Paulista, Larissa Oliveira; Ferreira, Alexandre; Castanheira, Bruna; Ðolić, Maja B.; Martins, Ramiro; Boaventura, Rui; Vilar, Vítor J.P.A new hybrid catalyst composed of mesostructured silica SBA-15 functionalized with TiO2 and further loaded with RuO2 was developed to efficiently promote thermo-photocatalytic CO2 hydrogenation into methane at low temperatures. The catalytic activity was assessed with respect to TiO2:RuO2 loading, catalyst dosage, illumination source (polychromatic sunlight and monochromatic LEDs) and power, [H2]:[CO2] molar ra...
Leather tanning sludge in cement mortar: Sustainable valorisation
Martins, Ramiro; Cabral, Rafaela Mulinari; Pietrobelli, Juliana Martins TeixeiraThis study aims to investigate the valorisation of sludge from Leather Tannery Wastewater Treatment Plants (LTWWTP) by incorporating it into cement mortars. Theoretical framework: The substantial quantity of waste generated by industries coupled with the scarcity of natural resources calls for the analysis, development, and implementation of treatment methods to recover and reuse materials, thereby minimising t...
Solar thermo-photocatalytic methanation using a bifunctional RuO2:TiO2/Z13X pho...
Paulista, Larissa O.; Ferreira, Alexandre F.P.; Rodrigues, Alírio; Martins, Ramiro; Boaventura, Rui; Vilar, Vítor J.P.; Silva, Tânia F.C.V.A novel bifunctional photocatalyst/adsorbent material based on the RuO2:TiO2/zeolite 13X (Z13X) composite was developed to enhance solar-driven methanation through simultaneous carbon dioxide (CO2) capture and thermo-photoconversion. The activity/stability of the hybrid material towards methane (CH4) production was assessed by varying the (i) photocatalyst composition (Ru load and semiconductor type), (ii) bifu...
Treatment of Pomace Olive Oil Wastewater by Peroxy-Electrocoagulation with Alum...
Martins, Ramiro; Tesuka, Leticia Harumi; Grabowski, Thais Theomaris dos SantosThe extraction of olive pomace oil is a significant aspect of the edible oil industry in Mediterranean regions where olives are widely cultivated. The resulting wastewater generated from this industry is known to harbor pollutants, including residual solvents, oils, and chemicals from the refining process, that can have adverse effects on the environment and public health. Peroxy-electrocoagulation (PEC) is a m...
Treatment for the Olive Pomace Oil Extraction Industry by Appling Peroxy-Electr...
Martins, Ramiro; Pinheiro, Luis Felipe do Nascimento; Grabowski, Thais Theomaris dos SantosThis study aimed to assess the effectiveness of peroxy-electrooxidation (PEO) for treating wastewater from the olive pomace oil extraction industry. The response surface methodology was utilized to optimize the efficiency of the PEO process under varying conditions of electrolysis time, current density, and hydrogen peroxide (H2O2) dosage. Appling graphite/aluminum sheets as cathode/anode in the treatment proce...
Treatment and Valorisation of Pomace Olive Oil Wastewater
Martins, Ramiro; Grabowski, Thais Theomaris dos SantosWastewater generated during the production of pomace olive oil is complex and highly variable due to different cultivation and processing characteristics. It has a high toxic organic load, low pH, and high chemical and biological demands. To reduce the concentration of chemical oxygen demand (COD) and total phenolic compounds (TPh) in pomace olive oil wastewater, several treatment processes have been studied. T...
Eco-friendly cement mortar with wastewater treatment plant sludge upcycling
Grabowski, Thais Theomaris dos Santos; Pietrobelli, Juliana Martins Teixeira; Martins, RamiroThis study aimed to investigate the technical feasibility of replacing cement in mortar production with sludge generated in wastewater treatment plants (WWTPs), prepared using different treatments. The sludge used in the experiments was processed using four different methods to investigate the effect of processing on the mechanical strength of the specimens. The sludge was then mixed with mortar in different pr...
Mining waste as an eco-friendly adsorbent in the removal of industrial basazol ...
Hawerroth, Mariane; Pereira, Eduardo; Almeida, Lariana N.B. de; Martins, Ramiro; Pietrobelli, Juliana Martins TeixeiraThe circular economy seeks to better use materials and minimize waste generation. This article evaluated the use of granite rock powder, a mining residue, as an adsorbent for the Basazol Yellow 5G (BY5G) dye and the reuse of the residue generated by the by treating this effluent in construction products. Characterization of the adsorbent material by N2 physisorption indicated a surface area of 1514 m2 g−1. Ener...
Partial replacement of cement by sewage treatment plant sludge in eco-friendly ...
Martins, Ramiro; Pietrobelli, Juliana Martins Teixeira; Grabowski, Thais Theomaris dos SantosAiming to create alternatives for the disposal of sludge generated in wastewater treatment plants (WWTP) considering the circular economy principles and contributing to the reduction of environmental impacts generated by civil construction, the objective of this work was to evaluate the technical feasibility of the partial replacement of cement in the production of mortars by the sludge produced at the Bragança...
Multistage treatment for olive mill wastewater: Assessing legal compliance and ...
Vuppala, Srikanth; Paulista, Larissa Oliveira; Morais, Daniela F.S.; Pinho, Inês L.; Martins, Ramiro; Gomes, Ana I.; Moreira, Francisca C.A treatment train for the remediation of a raw olive mill wastewater (OMW) was investigated, aiming to comply with the emission limit values (ELVs) for direct discharge into water bodies. The following stages were proposed: (i) pre-treatment (filtration and sedimentation), (ii) coagulation, (iii) biological oxidation, and (iv) advanced oxidation process (AOP). Under the best-operating conditions for coagulation...