Design and evaluation of a solar-powered water purification system for rural communities

Thesis Abstract

Access to safe and potable water remains a significant challenge in many rural communities, largely due to inadequate infrastructure, reliance on contaminated sources, and limited financial resources. This study addresses the critical need for sustainable water treatment solutions by designing and evaluating a solar-powered water purification system tailored for rural environments where traditional energy sources are scarce or unreliable. The primary aim is to develop an efficient, cost-effective, and environmentally sustainable system that can provide continuous access to clean water. Specific objectives include analyzing the technical feasibility of integrating photovoltaic technology with water purification methods, assessing the system's operational performance in real-world rural settings, evaluating community acceptance and usability, and determining the system’s economic viability. The research employs a mixed-methods approach, combining quantitative and qualitative data collection and analytical techniques. The quantitative component involves designing and constructing a prototype solar-powered water purification system based on ultrafiltration, UV sterilization, and solar photovoltaic (PV) modules. The system is deployed in three rural communities with populations ranging from 250 to 500 residents, selected through stratified random sampling to ensure representative insights. Data collection instruments include water quality tests (microbiological and chemical analyses), system performance logs, and surveys administered to 150 community members to gauge user perceptions, acceptance, and system usability. Complementary qualitative data are gathered through focus group discussions and Key Informant Interviews (KIIs) with community leaders and local health officials to explore socio-cultural factors influencing adoption. Data analysis involves descriptive statistics for water quality parameters, system efficiency metrics, and survey responses. Inferential statistics such as ANOVA evaluate differences in water quality before and after treatment, and multiple regression analysis identifies factors influencing community acceptance. Thematic analysis interprets qualitative data, revealing contextual factors affecting system integration and sustainability. System performance is further modeled using energy-efficiency analyses and life-cycle cost assessments to determine economic feasibility. Expected findings anticipate significant reductions in microbial contamination and chemical pollutants, with water quality meeting WHO standards post-treatment. The analysis is also expected to reveal high user acceptance driven by system simplicity, perceived health benefits, and cost savings. The study will demonstrate that the solar-powered purification system operates reliably under varying climatic conditions, with an estimated payback period of three years, making it an economically viable intervention. It is projected that the system can provide sustainable access to safe water, substantially reducing waterborne diseases in rural populations. This research contributes novel insights into the integration of renewable energy and water treatment technologies within rural settings, filling existing knowledge gaps on system design optimization, community engagement, and operational sustainability. The findings will inform policymakers, development agencies, and local governments about the practical viability and scalability of solar-powered water purification solutions, promoting decentralized and sustainable water access initiatives. The study concludes that a well-designed solar-powered water treatment system can significantly improve water quality and public health in rural communities when complemented by targeted community sensitization and capacity-building programs. Recommendations include scaling up system deployment through government-subsidized programs, enhancing community participation, and conducting long-term maintenance training for local technicians. Future research should explore innovations in low-cost materials, automation in system operation, and integration with decentralized sanitation infrastructure to optimize sustainability and impact.