Simultaneous removal of Co, Cu, and Cr from water by electrocoagulation

This study provides an electrocoagulation process for the removal of metals such as cobalt, copper, and chromium from water using magnesium as anode and galvanized iron as cathode. The various parameters like pH, current density, temperature, and inter electrode distance on the removal efficiency of metals were studied. The results showed that maximum removal efficiency was achieved for cobalt, copper, and chromium with magnesium as anode and galvanized iron as cathode at a current density of 0.025 A dm À2 at pH 7.0. First-and second-order rate equations were applied to study adsorption kinetics. The adsorption process follows second-order kinetics model with good correlation. The Langmuir and Freundlich adsorption isotherm models were studied using the experimental data. The Langmuir adsorption isotherm favors monolayer coverage of adsorbed molecules for the adsorption of cobalt, copper, and chromium. Temperature studies showed that adsorption was endothermic and spontaneous in nature

A comparative study of long short-term memory based long-term electrical load forecasting techniques with hyperparameter optimization

Long-term load forecasting (LTLF) is crucial for reliable electricity supply, infrastructure planning, and informed energy policies, ensuring grid stability and efficient resource allocation. Traditional methods, like statistical models and expert judgment, rely on historical data but may struggle with dynamic changes in technology, regulations, and consumer behavior. Addressing challenges such as economic uncertainties, seasonal variations, data quality, and integrating renewable energy requires advanced forecasting models and adaptive strategies. This research aims to develop an efficient LTLF model for the Coimbatore region in Tamil Nadu, India, using long short-term memory (LSTM) networks. While LSTM has limitations in capturing long- term dependencies and requires high data quality and complex management, optimizing hyperparameters, including through the opposition-based hunter- prey optimization (OHPO) technique, is explored to enhance its predictive performance. The results show that the proposed OHPO-configured LSTM model for LTLF achieves superior performance compared to other techniques, with a mean square error (MSE) of 0.25, root mean square error (RMSE) of 0.5 and mean absolute percentage error (MAPE) of 0.27. This research underscores the significance of improving LTLF precision for informed decision-making in infrastructure planning and energy policy formulation

Microbial Production of Amylase from Cassava Waste

Bacterium mura was isolated from cassava waste, (Tamil Nadu, India) for the production of extracellular amylase. On screening for amylase producing bacteria, 5 isolates showed positive results, of which Bacterium mura showed best amylase activity. The optimal conditions for the amylase activity were found at pH 6.0 (39 U/ml) and at temperature 37°C. Amylase activity was found to be higher when lactose (31 U/ml), casein, barley (42 U/ml) and SDS (32 U/ml) were used as the carbon source, nitrogen source, agro waste source and as additives respectively. The enzyme was partially purified by dialysis and the molecular mass was found to be 65kDa by SDS-PAGE. The partially purified and crude amylase was confirmed by zymogram. The partially purified amylase was used in bread making, which improved the softening of the bread and was used as a de-sizing agent

Acute upper limb ischaemia complication of thrombosed arteriovenous fistula

Thrombosed arteriovenous fistula is usually uncomplicated and adherent to the wall. Thrombosed vascular access causing acute limb ischaemia is rare, with only 16 cases reported in the literature. Varying treatment modalities such as percutaneous catheter-directed thrombolysis, aspiration, embolectomy, segmental aneurysm resection and ligation have been described in the literature for acute limb ischemia secondary to thrombosed fistula. The surgical approach aims to restore vascular patency, arterial stenosis and recurrence of acute limb ischaemia. This case series describes three cases of acute limb ischaemia due to a thrombosed fistula with a embolectomy via arterialized vein graft and ligation of the fistula at juxta-anastomosis. The clinical management and learning experience are shared within the report. This case report would timely contribute to the growing literature on thrombosed vascular access associated with acute limb ischaemia

Electroactivity across the cell wall of Gram-positive bacteria

Funding Information: This work was supported by national funds through FCT? Funda??o para a Ci?ncia e a Tecnologia, I.P. Project UIDB/04612/2020, UIDP/04612/2020 and PTDC/BIA-BQM/30176/2017, and by the European Union's Horizon 2020 research and innovation programme under grant agreement No 810856. Funding Information: This work was supported by national funds through FCT– Fundação para a Ciência e a Tecnologia, I.P., Project UIDB/04612/2020, UIDP/04612/2020 and PTDC/BIA-BQM/30176/2017, and by the European Union’s Horizon 2020 research and innovation programme under grant agreement No 810856. Publisher Copyright: © 2020 The Author(s) Copyright: Copyright 2021 Elsevier B.V., All rights reserved.The growing interest on sustainable biotechnological processes for the production of energy and industrial relevant organic compounds have increased the discovery of electroactive organisms (i.e. organisms that are able to exchange electrons with an electrode) and the characterization of their extracellular electron transfer mechanisms. While most of the knowledge on extracellular electron transfer processes came from studies on Gram-negative bacteria, less is known about the processes performed by Gram-positive bacteria. In contrast to Gram-negative bacteria, Gram-positive bacteria lack an outer-membrane and contain a thick cell wall, which were thought to prevent extracellular electron transfer. However, in the last decade, an increased number of Gram-positive bacteria have been found to perform extracellular electron transfer, and exchange electrons with an electrode. In this mini-review the current knowledge on the extracellular electron transfer processes performed by Gram-positive bacteria is introduced, emphasising their electroactive role in bioelectrochemical systems. Also, the existent information of the molecular processes by which these bacteria exchange electrons with an electrode is highlighted. This understanding is fundamental to advance the implementation of these organisms in sustainable biotechnological processes, either through modification of the systems or through genetic engineering, where the organisms can be optimized to become better catalysts.publishersversionpublishe

O3/H2O2 BASED AOPS FOR PPCPS REMOVAL: KINETIC STUDIES ON THE INFLUENCE OF INITIATOR, PROMOTER AND INHIBITOR WITH THE PRESENCE/ABSENCE OF NOM/EFOM

Ph.DDOCTOR OF PHILOSOPH

Larvicidal activity of CuO and ZnO nanoparticles against Aedes aegypti and Anopheles stephensi mosquito vectors-a greener approach by Phaseolus vulgaris L. aqueous extract as bio-reductant

In order to eradicate mosquito-borne diseases like malaria, chikungunya, dengue, and Zika virus which are mostly found in temperate zones, synthetic pesticides are widely used as a form of fumigation. This has resulted in a rise in mosquito-borne disease transmission dynamics and a substantial rise in atmospheric pollution. In light of this, the current work used an aqueous extract of Phaseolus vulgaris to formulate bioencapsulated CuO and ZnO NPs to combat mosquito vectors. The synthesized CuO and ZnO NPs were characterized using UV–visible, XRD, FT-IR, FE-SEM & EDX, AFM, and DLS techniques. According to analytical characterization, the CuO and ZnO NPs had monoclinic and hexagonal crystallites with average sizes of 13.7 nm and 185 nm, respectively. FE-SEM analysis confirms the spherical and flower-like morphology of CuO and ZnO NPs and their respective elemental composition was identified by EDX studies. The average particle size of CuO and ZnO NPs was determined to be 22.6 nm and 662 nm. CuO and ZnO NPs possessed zeta potential values of −23.2 mV and −29.7 mV respectively. The larvae of the malaria vector Anopheles stephensi and the dengue vector Aedes aegypti were subjected to compare the larvicidal bioassays in a range of concentrations of P. vulgaris aqueous extract with methanol extracts, and CuO NPs with ZnO NPs (6.25, 12.5, 25, 50, 100 µg/mL). The results showed the larvicidal activity of the aqueous extract is superior to the methanol extract and ZnO NPs are superior to the CuO NPs. This study further revealed that Aedes aegypti vulnerable than Anopheles stephensi to a given concentration of crude aqueous, methanol extracts of P. vulgaris and to CuO and ZnO NPs. The overall findings of this research demonstrated the feasibility of using these biosynthesized nanoparticles as highly effective, eco-friendly natural mosquito control pesticides

Organics removal in high strength petrochemical wastewater with combined microbubble-catalytic ozonation process

10.1016/j.chemosphere.2020.12798026