Physicochemical Evaluation of Microbial Growth and Population of Mild Steel in Effluent, Sea and Fresh Water Environments
[1]
Usman Muhammad Tukur, General Studies, Emirate College of Health, Kabuga, Nigeria.
[2]
Rabi Rabi’u Abubakar, Science Laboratory Technology, Federal Polytechnic, Kazaure, Nigeria.
[3]
Sani Rabi’u, General Studies, School of Health Technology, Daura, Nigeria.
Microbial growth and population on carbon steel by effluent, Sea water and fresh water investigated using Culturing technique, FTIR, SEM and XRF methods. Weight loss was used to observed change in weight on metal surface due to accumulations of corrosion products. Culturing technique was used to indicate presences of microorganisms responsible for changes in weights of water environments thrive and produce acidic by products. Effluent was found to have average populations of 3.25×10-3cfu/ml and 3.28×10-3cfu/ml, Sea water was found to have average populations of 1.40×10-3cfu/ml and 2.53×10-3cfu/ml and Fresh water was found to have average populations of 1.07×10-3cfu/ml and 2.33×10-3cfu/ml before and after immersion of metal coupons of different bacterial species respectively. Similarly, same fungal species identified in both effluent and Fresh water, with average populations of 9.01×10-3cfu/ml and 7.22×10-3cfu/ml respectively, while different species with average populations of 2.98×10-3cfu/ml was found in Sea water after immersion of carbon coupons. Contaminated water environment is characterized by high value of biochemical oxygen demand (BOD), chemical oxygen demand (COD), colour and pH, because it causes rapid depletion of dissolved oxygen if it is directly discharge into the surface of water sources and are toxic to biological life. High alkalinity and traces elements adversely affect the aquatic life and also interfere with the biological treatment process. XRF results confirmed that, colonization of microorganisms in the water environments contains heavy and trace elements. FTIR results confirmed that, presence of functional groups such as amines, amides, Imines, aldehydes which are found in metabolites produced by microorganisms and some of these metabolites produced have a great impact, while some are said to be as waste end products as corrosion products. SEM shows the metal surface microgram. These changes in compositions of elements and weight of carbon steel is due to the presences of extensive micro pitting on the surface.
Corrosion, Microorganisms, Bacteria, Fungi, Carbon Steel, Effluent, Sea Water and Fresh Water
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