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By Rita Okoye
A newly published study has spotlighted a silent but pressing issue within the petroleum industry: mercury contamination in crude oil and gas condensates.
The research, led by Nigerian environmental scientist Dr. Omobayo Salawu, a Lecturer in the Department of Chemistry at King Fahd University of Petroleum and Minerals, developed silver nanoparticle-loaded activated carbon as an advanced adsorbent.
The material demonstrated remarkable efficiency in removing mercury from Arabian gas-condensate, a challenge that also reflects environmental risks in Nigeria’s Niger Delta.
While global attention on Nigeria’s oil sector often revolves around oil spills and gas flaring, mercury pollution is an equally dangerous but less visible threat. Naturally occurring mercury is often present in crude oil and gas reservoirs. Once released, it corrodes equipment, contaminates refining streams, and can enter surrounding water systems. In a country where communities already live under the shadow of industrial pollution, mercury poses an additional public health risk through bioaccumulation in fish and exposure in drinking water sources.
According to Salawu, the breakthrough rests on combining the adsorption capacity of activated carbon with the unique affinity of nanosilver for mercury. “Our composite material was able to capture mercury rapidly and with a higher efficiency than conventional adsorbents,” he explained. “Just as importantly, it can be regenerated and reused, which makes it practical for large-scale application in oil and gas processing.”
The findings have implications far beyond the laboratory. “For Nigeria, where gas condensates are central to both export and domestic refining, this technology points to a pathway for safer and cleaner operations,” Salawu noted. “It addresses not only environmental contamination but also the economic losses caused by mercury-induced corrosion in pipelines and equipment.”
Analysts warn that inadequate monitoring of trace metals, including mercury, has left a blind spot in Nigeria’s petroleum regulatory framework. With the government prioritizing gas expansion under its Decade of Gas initiative, the challenge is ensuring that environmental safeguards keep pace.
Salawu emphasized that science must work hand in hand with policy: “We cannot afford to treat mercury as an invisible problem. The technology is ready, but it will require strong collaboration between researchers, regulators, and industry to protect both people and ecosystems in the Niger Delta.”
This study underscores that the environmental footprint of oil and gas extends far beyond spills and flaring. By advancing mercury removal from condensates, the research provides a pathway that countries like Nigeria, with growing gas ambitions, can adapt to safeguard both industry and communities.”
