Microbial contamination in urban wastewater systems: Emerging health threats and mitigation strategies

Microbial contamination in industrial wastewater poses significant threats to public health and the environment, necessitating a comprehensive understanding of microbial dynamics, detection, and control strategies. This review provides a detailed exploration of microbial contaminants in industrial wastewater, including bacteria (Escherichia coli, Salmonella, Vibrio cholerae), viruses (Hepatitis A, Norovirus), protozoa (Cryptosporidium, Giardia), and fungi, highlighting their sources, proliferation factors, and associated health risks. Emerging health threats, such as waterborne disease outbreaks, the rise of antibiotic-resistant microbes, and their disproportionate impact on vulnerable populations, are critically examined. Advanced detection and monitoring techniques, including culture-based methods, molecular tools like qPCR, biosensors, and metagenomic analyses, are discussed for their role in improving pathogen surveillance. Factors influencing microbial proliferation, such as temperature, pH, chemical composition, and seasonal variations, are explored to underscore the complexity of microbial dynamics in wastewater systems. Mitigation strategies, including primary, secondary, and tertiary treatment technologies, advanced oxidation processes, and disinfection methods such as chlorination, UV radiation, and ozone treatment, are evaluated for their effectiveness. The role of policy frameworks and international guidelines in promoting safe wastewater management is highlighted. The review also emphasizes the growing importance of nature-based solutions, such as constructed wetlands and green infrastructure, in achieving sustainable wastewater treatment. Future directions are outlined, including the integration of innovative microbial control technologies, real-time monitoring through AI and IoT, and policy innovations to foster international collaboration. This work concludes that addressing microbial contamination requires a multi-faceted approach involving technological advancements, policy development, and public education. Recommendations are made to prioritize real-time monitoring, capacity building, and the adoption of nature-based and advanced treatment technologies. By fostering collaborative efforts across research, regulatory, and industrial sectors, more sustainable and effective wastewater management systems can be developed to safeguard public health and environmental sustainability.