Articles

Water management is a critical challenge for uranium processing operations in arid regions, where industrial activities depend heavily on limited groundwater resources. This study evaluates the performance of the filter cloth washing water recycling circuit at the Aïr Mining compagny (SOMAÏR) uranium processing plant in Niger and identifies the principal factors limiting continuous water reuse. The investigation combined operational water-flow monitoring, historical production records, field sampling from Pit 3, physicochemical characterization of recycled water, suspended-solids determination, and particle-size analysis. Under normal operating conditions, the recycling circuit achieved an average recycling efficiency of 57.5%, corresponding to approximately 850 m³/day of industrial water savings. The recycled water exhibited a density of 0.994 g/cm³, pH of 2.53, oxidation- reduction potential of 480 mV, and suspended-solids concentration of 2052 mg/L. Particle-size analysis showed that approximately 97.6% of the suspended particles were smaller than 200 μm, allowing a substantial fraction of solids to bypass the 250 μm vibrating-drainer screen and accumulate in Decanter 1. Progressive sediment accumulation, together with screen deterioration and mechanical limitations, reduced clarification capacity and ultimately interrupted the recycling circuit. Engineering measures including improved fine-particle separation, optimization of screen aperture, systematic screen maintenance, improved sludge removal, and continuous monitoring are therefore proposed. These measures could enhance recycling reliability, reduce freshwater consumption, and improve water- management sustainability at SOMAÏR.

We have reported novel solid-cancer treatment modality of nano-thermal ablation therapy using two medical devices of 100kHz electromagnetic field radiator and heat-generating nanoparticles of MCL particle [1]. External 100kHz electromagnetic field radiation induced heat generation of MCL particle in tumor tissue and caused tumor specific cytotoxicity and blood vessel disruption [1]. MCL particle was designed to be about 100nm diameter and to move within tumor tissue by composing heat-generating magnetite (Fe₃O₄) with neutral and cationic lipids [1]. However, concerning 100kHz radiator, rational concept of its performance and specification was not fully discussed. Purpose of this seminar is to describe significance of 100kHz magnetic flux density for rational designing, specification and usage of the radiator, referring to our unpublished data during 2004~2025. At first, our calibration method of 100kHz magnetic flux density was shown, and then its application to density distribution analysis of our radiators HTS-5010H and Hi-Heater 5010 was described. And, based on density distribution profile of Hi-Heater 5010 radiator, effective density at tumor locus in the standard treatment condition of the therapy was confirmed 15mT. Based on the recorded data of clinical research using HTS-5010H radiator, safety radiation condition toward groin, breast, thigh, neck, chest and arm were shown with density distribution in patient bodies. With all respect, quoting MFH^®300F (100kHz) radiator [2], availability of three types radiators for various target cancers was discussed on the basis of effective tumor density and mitigation of normal tissue heating. According to Design Control Guidance of medical device [3], design process of the radiator was exemplified by drafted documents of design input and output.

The objective of this study was to examine the barriers to effective solid waste management in the Komenda-Edina-Eguafo-Abrem Municipality in the Central Region of Ghana. This study adopted the cross-sectional descriptive survey research design. The population for the study comprised all residents of 18 years or older as well as waste management agencies in the KEEA Municipality. A simple random sampling technique was used to select 380 residents together with 45 staff of the Zoomlion Company Ltd in the KEEA Municipality for the study. The questionnaire was the main instrument used for the data collection. Frequencies, percentages, means and standard deviations were used to analyse the questionnaire items on the research questions. This was done with the use of the Statistical Package for Service Solutions (SPSS) version 21. There were a number of barriers to effective solid waste management practices. Some of the barriers were inadequate environmental education; inadequate logistics and funds; inadequate depots, skips and dustbins; lack of adequate skilled personnel to manage services efficiently; and apathetic attitude/inertia on the part of some of the residents. Some other barriers included: irregular collection of waste by waste management companies; lack of appropriate sites for waste disposal; unwillingness of some households to pay for the collection and appropriate disposal of solids; and refuse dumps located very far from home. It is recommended that the government through the Ministry of Local Government should provide adequate logistics and funds for the procurement of dustbins in order to ensure proper solid waste management. The Assembly should ensure that Zoomlion collects waste regularly. The Assembly should encourage residents to pay for the collection of waste and sanction recalcitrant residents who do not adhere to appropriate solid waste management practices.

The purpose of this study was to examine the effectiveness of environmental solid waste management policies and practices for sustainable development in Komenda-Edina-Eguafo-Abrem Municipality in the Central Region of Ghana. The case study research design was adopted for the study. Using the simple random sampling procedure, 425 respondents comprising of 380 residents and 45 Zoomlion staff were involved in the study. The data were analysed through the computation of frequencies, percentages, as well as means and standard deviations. On the waste management strategic action plan for sustainable development, it can be concluded that, regular monitoring system should be in place to ensure that households adhere to the solid waste management practices; and education/training programmes on solid waste management should be provided for employees so that they can appreciate the need for sustainable development practices. It can also be concluded that, most of the environmental management policies and practices of solid waste management were not effective in the KEEA Municipality because the residents were uncertain about the effectiveness of the environmental policies that have been put in place. Perhaps, the Assembly does not conduct regular monitoring to find out solid waste management practices of the various households. It could be that the Assembly does not enforce bye-laws on sanitation on appropriate solid waste management practices. It is recommended that, the Environmental Protection Agency (EPA), and the Assembly should conduct regular monitoring system in order to ensure that residents adhere to the solid waste management practices. Again, the Assembly should make available a reliable data on solid waste generation for households in the Municipality. It is also recommended that, the Environmental Protection Agency (EPA) and the Assembly should ensure proper enforcement of the bye-laws on sanitation on appropriate solid waste management practices. Residents of the KEEA Municipality should be encouraged by the Environmental Protection Agency (EPA) to consider reuse and recycling as important activities.

The purpose of the study was to examine solid waste disposal situation and its resultant effects in Winneba The research adopted quantitative approach for the study. The design for this research was a descriptive survey. The population for the study were residents of Winneba Township the capital of the Effutu municipality. The area is a fast growing urban community. Stratified sample sampling technique was used to select the respondents for the study. One hundred and fifty-six (156) residents were selected using strata sampling to answer questionnaires. The data entry and analysis was done by using the SPSS software package. The data was edited, coded and analysed into frequencies, percentages with interpretations. The study revealed that there was irregular or lack of routine collection of waste by WMD of EMA and ZoomLion Ghana Ltd. The study also indicated that, the landfill did not meet the requirement of a sanitary landfill as in the case of EMA and therefore could be described as an open dump. It is recommended that, adequate dustbins and skips should be provided by ZoomLion Ghana Ltd. in collaboration with the WMD and Municipal Assembly for residents in the Municipality for waste storage. It is recommended that the landfill site should be properly managed to avoid heaping of waste and burning.

Waste collection system has become a challenging task, occasioned by the overflowing garbage bins littered all over the environment, causing environmental hazard and further leading to incurable diseases which endanger life. The present-day waste collection system has proven to be inefficient, taking into consideration the advancement in the technologies on the rise in recent years as well as the continuous increase in population growth. As a result of this inefficiency observed, this work developed a model for electronic waste collection system in a telecommunication driven environment. In the system's implementation, PIC18F4620 based instrumentation, integrated with proximity sensor for external monitoring and level sensors for internal monitoring was adopted, while the controlling of the opening and closing of the cabins was implemented using a smart switching board. A remote reporting to the waste management authority so as to systematically plan route-map for garbage collection when the waste cabin is fully filled was done by deploying a 900MHz transmitter interfaced with the system’s controller. The result shows that with this model the waste cabin opens only on account of a user approaching the sensing distance of the system and the cabin is not filled. But when the cabin gets filled and a user approaches the sensing distance of the system, it directs the user to use the nearest waste cabin by displaying a message on the LCD (Liquid Crystal Display), while communicating with relevant authority for the evacuation of the cabin via SMS. It was obviously seen that the automation incorporated into the system had zero impact on the success rate of the system or system availability while introducing a latency of 5.6seconds, which is just 28.0% of the maximum allowable latency of this kind of system, while protecting the environment from environmental pollution and spread of diseases. This work highlights the potentials of (EWCS) Electronic Waste Collection System in monitoring and controlling waste disposal for healthy and clean environment.