Sains Malaysiana 49(3)(2020): 671-682

http://dx.doi.org/10.17576/jsm-2020-4903-22

Influence of Environmental Parameters on Microbiologically Influenced Corrosion Subject to Different Bacteria Strains

(Pengaruh Parameter Persekitaran ke atas Subjek Kakisan Pengaruh Mikrob kepada Strain Bakteria Berbeza)

MUHAMMAD KHAIROOL FAHMY MOHD ALI¹, MARDHIAH ISMAIL¹, AKRIMA ABU BAKAR¹, NORHAZILAN MD. NOOR^1,2, NORDIN YAHAYA¹, LIBRIATI ZARDASTI^1* & ABDUL RAHMAN MD. SAM^1,2

¹School of Civil Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor Darul Takzim, Malaysia

²Construction Research Centre, School of Civil Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor Darul Takzim, Malaysia

Received: 20 June 2019/Accepted: 4 December 2019

Abstract

Microbiologically influenced corrosion (MIC) is capable on weakening the metal’s strength, eventually leads to pipeline leakage, environmental hazard and financial loss. Sulfate reducing bacteria (SRB) is the principal causative organism responsible for external corrosion on steel structures. To date, considerable works have been conducted in Malaysia on the mechanisms of SRB upon MIC on the marine environment instead of underground. Moreover, commercial bacteria strain represents local strain in terms of performance and behavior upon corrosion of steel structure is yet to be proven. Thus, this paper aims to investigate the influence of environmental parameters towards MIC in corroding pipeline. Two types of SRB strain were used designated as SRB ATCC 7757 (commercial) and SRB Sg. Ular (local strain) isolated from Malaysian soil. The behavior of both strains was critically compared by calculating the rate of corrosion upon carbon steel coupons in stipulated environmental parameters. Four influential parameters i.e. pH, temperature, salinity concentration and iron concentration were considered. Collected data presented and analyzed using graphical and statistical analysis, respectively. The results showed the difference of corrosivity between two SRB strains in terms of corrosion behavior upon the X-70 steel coupon. SRB Sg. Ular able to cause severe effects upon steel structure as compared to SRB ATCC 7757 due to its aggressiveness shown by the recorded metal loss data. Thus, future works related to MIC for local environment in particular, should not compromise with the type of SRB strains considered due to differences of performance of the microorganisms onto tested environment and materials.

Keywords: Environmental parameter; microbiologically influenced corrosion (MIC); pipeline; sulfate-reducing bacteria (SRB)

Abstrak

Kakisan Pengaruh Mikrob (MIC) akan melemahkan kekuatan logam, mengakibatkan kebocoran saluran paip, ancaman terhadap alam sekitar dan kerugian wang ringgit. Bakteria penurunan sulfat (SRB) merupakan organisma utama yang bertanggung jawab mengakibatkan kakisan luar terhadap struktur keluli. Di Malaysia khususnya, banyak kajian berkaitan mekanisma SRB terhadap MIC dalam persekitaran marin telah dijalankan, berbanding persekitaran bawah tanah. Kebanyakan kajian terdahulu menggunakan strain komersial untuk mengkaji mekanisma SRB kerana ia mudah didapati berbanding strain tempatan. Bagaimanapun, tiada kenyataan khusus yang bersetuju bahawa strain komersial secara praktiknya mampu mewakili strain tempatan sepenuhnya daripada segi penilaian prestasi dan perilaku. Dengan itu, kajian ini dijalankan bertujuan untuk mengkaji kesan SRB strain yang berbeza terhadap kadar kakisan logam. Kajian ini menggunakan dua jenis strain SRB iaitu strain komersial ATCC 7757 dan strain SRB tempatan yang diambil dari Sungai Ular. Empat parameter persekitaran diambil kira dalam uji kaji ini iaitu pH, suhu, tahap kemasinan dan kepekatan iron. Data yang dikumpulkan telah dibentangkan dan dianalisis dengan menggunakan analisis grafik dan statistik. Keputusan kajian semasa menunjukkan perbezaan yang amat ketara antara kedua-dua strain SRB daripada segi tahap kakisan terhadap kupon keluli X-70. SRB Sg. Ular merupakan strain yang agresif dan ia berupaya mengakibatkan kesan yang lebih teruk terhadap struktur keluli berbanding SRB ATCC 7757, ini dapat dibuktikan dengan jelas melalui data kehilangan logam yang direkodkan. Justeru, bagi mendapatkan ramalan kakisan yang tepat pada masa hadapan, kerja-kerja yang berkaitan MIC khususnya tidak dipandang remeh, terutama berkaitan pemilihan organisma yang ingin digunakan.

Kata kunci: Bakteria penurunan sulfat (SRB); kakisan pengaruh mikrob (MIC); parameter persekitaran; saluran paip

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*Corresponding author; email: libriati@utm.my