This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: According to a study conducted by researchers at Sultan Qaboos University, the material used to support microbial biofilms could influence their potential role in treating water generated during oil production. The research was led by Ph.D. candidate Arwa Al-Hadhrami under the supervision of Dr.
Daniel Blackburn and conducted by a Sultan Qaboos University team representing the College of Agricultural and Marine Sciences and the Water Research Center, Oman. The results are published in Environmental Advances. Produced water is the water brought to the surface during oil and gas extraction.
It is a major waste stream from the petroleum industry and may contain salts, hydrocarbons and other contaminants. Constructed wetlands can provide a nature-based approach to its treatment, partly by supporting microbial communities that interact with and potentially break down pollutants. In this study, researchers examined whether different supporting materials affect the formation, abundance and composition of biofilms inside a 14-hectare (35-acre) constructed wetland treating oil-produced water in Rima, Oman (managed by Veolia).
Biofilms are communities of microorganisms that attach to surfaces and grow within self-produced protective layers. The properties of the supporting surface can influence the establishment of microorganisms and the development of the community. The researchers placed plywood, polypropylene and natural marble surfaces across three tracks within the constructed wetland.
After 30 days, they collected and compared the biofilms that developed on the three materials. They also analyzed the microorganisms suspended in the produced water and those found in naturally floating biofilms. The results showed that the surface-attached biofilms contained approximately 240 to 3,100 times more bacteria than the surrounding produced water.
Among the three materials, plywood supported the highest bacterial counts. Depending on the wetland track, bacterial abundance on plywood was approximately 2 to 9 times greater than that on polypropylene and 3 to 11 times greater than that on marble. Plywood recorded the highest chlorophyll-a concentrations, reaching up to 6.9 micrograms per square centimeter.
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