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Mosquitoes are carriers of diseases like malaria, dengue fever, chikungunya, zika fever, and lymphatic filariasis, which can be deadly in Tropical Africa and certain subtropical regions. The World Health Organization recognizes mosquito bites as the primary cause of over a million deaths annually due to malaria. It is crucial to reduce or eliminate the mosquito population in Africa if possible. Presently, malaria vector control methods mainly involve using insecticide-treated bed nets, long-lasting insecticidal nets, or indoor residual spraying. However, many existing mosquitos control products have not proven to be effective in eradicating mosquitoes in these regions. In this study, a solar-powered mosquito killer with voice activation was developed using an Arduino board, an ultrasonic sensor, an electric fence driver, a direct current (DC) fan, and UV lights. The Ultraviolet (UV) lights are visible to some insects and enhance the trapping effect by combining heat and carbon dioxide. The device has voice activation to minimize human contact. It is an improvement over previous methods that utilized voiceactivated equipment without harmful elements or irritating insecticides. The device mimics a mosquito's sensory receptors to attract and ultimately eliminate them. The equipment includes a 5V DC fan operating at 1800-3700 rev/min, a mist humidifier emitting mist at regular intervals (operating frequency of 0.8MHz - 1.75MHz), an electric fence producing over 1000 volts to render mosquitoes lifeless upon contact, and a voice module for device control. The device is powered by an external outlet power cord supplying 5-12 volts to activate the micro-controller. [ABSTRACT FROM AUTHOR]

The current literature lacks a comprehensive discussion on the trade-off between pollutant degradation/mineralization and treatment time costs in utilizing UV light in combination with H 2 O 2 -based electrochemical advanced oxidation processes (EAOPs). The present study sheds light on the benefits of using the photoelectro-Fenton (PEF) process with UVA or UVC for methylparaben (MetP) degradation in real drinking water. Although light boosts the photodegradation of refractory Fe(III) complexes and the photolysis of H 2 O 2 (with UVC only), the energy-intensive nature of light-based treatments is acknowledged. To help tackle the high energy consumption issue, a novel approach was employed: partial application of UVA or UVC light after a predetermined electro-Fenton electrolysis time. The proposed treatment approach yielded satisfactory comparable results to those obtained from the application of PEF/UVA or PEF/UVC in terms of total organic carbon removal (ca. 100%), with notably lower energy consumption (ca. 50%). The study delves into the combined method's feasibility, analyzing pollutant degradation/mineralization process and overall energy consumption. The research identifies possible degradation routes based on intermediate detection and radical quenching experiments. Finally, toxicological assessments evaluate the toxicity levels of MetP and its intermediates. The findings of this study bring meaningful contributions to the fore and point to the highly promising potential of the proposed approach, in terms of sustainability and cost-effectiveness, when applied for decentralized water treatment. [Display omitted] • Combining H 2 O 2 -based electrochemical advanced oxidation processes with UV light for the oxidation of pollutants. • EF + UVC system can outperform in 50% the PEF process in terms of specific energy consumption per TOC. • A possible intermediate route is proposed; most intermediates and by-products have not harmful toxicity. • A sustainable cost-effective decentralized system for water treatment was obtained. [ABSTRACT FROM AUTHOR]