Climate change, conflict, and displacement are increasing the spread of mosquito-borne diseases. This WHO/UNICEF technical note offers practical guidance for implementing water, sanitation, and waste management measures to prevent these diseases, particularly in emergency situations.

This study reviewed materials used to remove petroleum and oil products from contaminated water. Fibrous sorbents are ideal for large spills, while dispersed or granulated ones work best for small slicks. Multilayer filters are most effective for wastewater purification. Modifying sorbent materials can enhance their properties and create new purification technologies.

A study combined numerical modeling and health risk assessment to evaluate the impact of oil depot leakage on groundwater pollution. The study found that organic pollutants pose the highest risk, followed by heavy metals and inorganic pollutants. The polluted area is expected to expand over time, posing both non-carcinogenic and carcinogenic health risks. This research provides valuable insights for protecting groundwater sources and informing remediation efforts.

Increased pesticide use in agriculture has led to elevated levels in water. This review examines various chemical, physical, and biological methods for pesticide removal, including advanced oxidation, adsorption, and membrane technologies. Both single and hybrid approaches are discussed, with hybrid methods showing potential for innovative solutions. Careful consideration of the best removal techniques is crucial for designing water treatment plants that maximize pesticide removal. Decentralized treatment is also a cost-effective approach for improving effluent water quality.

This project developed a water treatment system using magnetite nanoparticles to remove heavy metals and microbes. It optimized the adsorption of lead and arsenic onto surfactant-free magnetite nanoparticles, and developed a sustainable method for synthesizing the nanoparticles using household items. The system successfully removed heavy metals to meet EPA standards, and explored alternative methods for microbe removal using slow sand filters.

Papua New Guinea faces challenges in providing clean water and sanitation. A national policy and specific school standards have been developed to address this. The goal is to improve student health and education. All schools are expected to implement this policy, which will be used by all relevant stakeholders. Successful implementation is expected to positively impact the health of the country's youth.

A study in Nigeria's Niger Delta found that oil spillage negatively impacts groundwater quality. Water samples from areas with a history of spillage showed higher levels of hydrocarbons and turbidity, and were more acidic than samples from uncontaminated areas. This suggests the need for water treatment and comprehensive groundwater monitoring in the region.

Microbial pollution in water bodies poses a significant health risk. Current monitoring methods, like turbidity measurements, have limitations. This review examines the origins and behavior of waterborne microorganisms, existing optical detection methods, and proposes new research avenues, particularly in light of increased heavy rainfall due to climate change.