Author Archives: Nadjib Drouiche

About Nadjib Drouiche

Dr. Nadjib Drouiche is a multidisciplinary researcher and policy analyst with an extensive academic background and a strong record of scientific publications across several domains. His research interests span semiconductor technology, energetics, and environmental sciences, with a particular emphasis on desalination, wastewater treatment, and sustainable water management.

Valorization of Desalination Brines into Molten Salts, Carbonates and Thermal Fluids

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The management of brines generated from seawater desalination has become a central issue in arid and semi-arid regions, particularly in Mediterranean basin countries and the Middle East. The rapid increase in desalination capacity, especially through reverse osmosis, has helped secure access to drinking water but has also generated a growing stream of hypersaline discharges. Global estimates indicate that worldwide brine production now exceeds 140 million m³/day, or more than 50 billion m³/year, with continuous growth driven by industrial desalination development [1]. One of the most widely studied pathways is the transformation of salts contained in brine into materials for thermal … Continue reading →

Critical Minerals and the Water–Environment Nexus: Challenges and Pathways for Sustainable Extraction

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The rapid acceleration of the global energy transition has placed critical minerals at the center of economic, technological, and geopolitical transformations. Minerals such as lithium, cobalt, nickel, rare earth elements, and copper are indispensable for renewable energy systems, electric vehicles, digital infrastructure, and energy storage technologies. International institutions including the International Energy Agency (IEA), the United Nations (UN), and the European Union (EU) increasingly describe these resources as the backbone of decarbonization pathways [1]. However, the expansion of critical mineral extraction raises profound environmental concerns, particularly regarding water consumption, water pollution, ecosystem degradation, and social inequalities. While these materials are … Continue reading →

British Coal as a Warning for the Global Energy Transition

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The history of the Industrial Revolution in Great Britain is often portrayed as a linear path of technological progress and economic expansion. Yet this narrative conceals structural costs that, in light of today’s energy transition challenges, deserve rigorous re-examination. The rise of coal in the 18th and 19th centuries formed the energy backbone of modern industrialization, enabling unprecedented growth in production, urbanization, and trade. However, this transformation came with deep and lasting social, environmental, and economic damages, some of whose underlying mechanisms risk being replicated today in the global energy transition, characterized by a heavy reliance on critical minerals whose … Continue reading →

Solid Waste Management in the Mediterranean – Challenges, and Success Stories

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Solid waste management in the Mediterranean region represents one of the most complex and pressing environmental challenges of the 21st century, shaped by a unique combination of demographic pressures, economic disparities, tourism intensity, and fragile ecosystems. The Mediterranean basin, home to over 500 million people and one of the world’s leading tourist destinations, generates rapidly increasing volumes of municipal solid waste (MSW), while facing persistent structural deficiencies in collection, treatment, and disposal systems. These challenges are particularly acute in the southern and eastern Mediterranean countries, where institutional, financial, and technical limitations hinder progress toward sustainable waste management systems. Scale of … Continue reading →

Hazardous Waste Management in MENA: Pathways, Challenges and Opportunities

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Hazardous waste management in the Middle East and North Africa (MENA) region has become a critical environmental, economic, and public health issue, shaped by rapid industrialization, demographic growth, urban expansion, and increasing consumption patterns. Hazardous waste, defined as waste exhibiting toxic, corrosive, reactive, or flammable properties requires specialized handling, treatment, and disposal systems to prevent harm to ecosystems and human health [1]. Globally, between 300 and 500 million tonnes of hazardous waste are generated annually, reflecting the scale of the challenge [2]. Within the MENA region, although comprehensive data remain fragmented, available evidence suggests that hazardous waste streams are rising … Continue reading →

Rethinking Desalination through Digital Twins: From Energy-Intensive Processes to Intelligent Water Systems

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The increasing global water scarcity driven by climate change, population growth, and industrial expansion has positioned desalination, particularly seawater reverse osmosis (SWRO), as a strategic solution for ensuring water security. However, desalination processes remain energy-intensive, operationally complex, and sensitive to variations in feedwater quality and membrane performance. In this context, the emergence of the Digital Twin represents a paradigm shift in the management and optimization of desalination systems. What is Digital Twin? A digital twin is generally defined as a dynamic virtual replica of a physical system that integrates real-time data, physics-based models, and advanced analytics to simulate, predict, and … Continue reading →

Desalination Membranes as RDF for Cement Kilns: Opportunities and Constraints

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The rapid expansion of desalination through reverse osmosis has significantly transformed global water resource management, but it has also created a growing challenge related to the management of end-of-life membranes. These industrial wastes, mainly composed of engineering polymers such as polyamide, polysulfone, and polypropylene, exhibit physicochemical properties that, while initially optimized for filtration, may become an asset within an energy recovery framework [1-2]. The average lifespan of reverse osmosis membranes ranges from five to ten years, generating substantial waste streams worldwide [1]. As an order of magnitude, a desalination plant with a capacity of 100,000 m³/day can generate between 2,000 … Continue reading →

Methane Emissions from Anaerobic Degradation of Organic Matter and Mitigation through Flaring

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Methane (CH₄) is a key product of the anaerobic degradation of organic waste and represents one of the most critical environmental challenges associated with waste management systems, particularly landfills and controlled disposal sites. The formation, emission, and mitigation of methane from such systems have been extensively studied due to its high global warming potential and its significant contribution to anthropogenic greenhouse gas emissions. This work provides a comprehensive discussion of methane generation through anaerobic degradation processes and evaluates mitigation strategies, with a particular focus on flaring, which converts methane into carbon dioxide (CO₂), thereby reducing its climate impact. The biodegradation … Continue reading →

Water-Food-Energy-Ecosystems Nexus in MENA: Role of Startups and Entrepreneurship

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The MENA region stands at the intersection of some of the most acute resource challenges globally. Water scarcity, energy dependency, food insecurity, and ecosystem degradation are not isolated crises; they are deeply interconnected, reinforcing one another in complex and often unpredictable ways. The Water–Energy–Food–Ecosystems (WEFE) Nexus has emerged as a conceptual and operational framework to address these interdependencies, promoting integrated resource management and cross-sectoral coordination. Yet, despite its conceptual maturity and policy recognition, the WEFE Nexus in MENA remains largely under-implemented. The missing link is not knowledge, nor policy ambition, it is execution. Increasingly, startups and entrepreneurship are emerging as … Continue reading →

Decentralized Brackish Water Desalination as a Catalyst for Climate-Resilient and Sustainable Agriculture

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Water scarcity has emerged as one of the most pressing challenges facing the Mediterranean basin, a region characterized by sharp climatic gradients, demographic pressures, and structural inequalities in resource distribution. Agriculture alone accounts for between 64% and 79% of freshwater withdrawals in many Mediterranean countries, particularly in the southern and eastern shores, where irrigation is essential for food security and rural livelihoods [1]. Climate change is intensifying these pressures through increased frequency of droughts, rising temperatures, and declining precipitation, thereby exacerbating groundwater depletion and salinization [2]. In this context, decentralized brackish water desalination is gaining recognition as a promising pathway … Continue reading →

Diversifying Water Resources as a Strategic Risk Management Approach: Case of Algeria’s Integrated Water Supply System

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Water scarcity has emerged as one of the most critical global challenges of the twenty-first century, particularly in arid and semi-arid regions where natural water availability is inherently limited and increasingly threatened by climate change. In such contexts, relying on a single water source is no longer sustainable. Scientific consensus increasingly supports the idea that no single solution can solve water scarcity; instead, diversification of water supply sources represents a robust and adaptive risk management strategy. This approach is particularly relevant for countries like Algeria, where water stress is structural, yet where significant investments have been made to mobilize a … Continue reading →

Aquaculture Using Desalination Brine: Transforming a Waste Stream into Sustainable Food Production

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The rapid expansion of desalination capacity in arid and semi‑arid regions has generated an urgent need to find sustainable uses for the concentrated brine by‑product produced by seawater and brackish water desalination plants. Traditionally, brine has been treated as a waste stream, often discharged into the sea or terrestrial environments with little or no value recovery. Because most desalination technologies, especially reverse osmosis, produce brine with salinities significantly higher than natural seawater, improper disposal of this stream can lead to negative environmental impacts, including increased salinity in coastal zones, benthic ecosystem disruption, and changes in water column chemistry. However, over … Continue reading →