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      • KCI등재

        Petroleum sludge treatment and disposal: A review

        Olufemi Adebayo Johnson,Augustine Chioma Affam 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.2

        Petroleum industry produces one of the popular hazardous waste known as Petroleum Sludge. The treatment and disposal of petroleum sludge has created a major challenge in recent years. This review provides insights into various approaches involved in the treatment, and disposal of petroleum sludge. Various methods used in the treatment and disposal of petroleum sludge such as incineration, stabilization/solidification, oxidation, and bio-degradation are explained fully and other techniques utilized in oil recovery from petroleum sludge such as solvent extraction, centrifugation, surfactant EOR, freeze/thaw, pyrolysis, microwave irradiation, electro-kinetic method, ultrasonic irradiation and froth flotation were discussed. The pros and cons of these methods were critically considered and a recommendation for economically useful alternatives to disposal of this unfriendly material was presented.

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        The effect of divalent and trivalent cations on aggregation and surface hydrophobicity of selected microorganism

        M. Anwar Alias,Khalida Muda,Augustine Chioma Affam,Azmi Aris,Normala Hashim 대한환경공학회 2017 Environmental Engineering Research Vol.22 No.1

        This study investigated the effect of various cations (Ca<SUP>2+</SUP>, Mg<SUP>2+</SUP>, Al<SUP>3+</SUP>, Mn<SUP>2+</SUP>, Zn<SUP>2+</SUP>) on the autoaggregation (AAg) and surface hydrophobicity (SHb) of three different bacteria (Brevibacillus panacihumi strain (ZB1), Lysinibacillus fusiformis strain (ZB2) and Enterococcus faecalis strain (ZL)) using a 2-level factorial design. The AAg ratio was measured from the changes in the absorbance of the media. Results show that ZB2 had maximum AAg for the three bacteria investigated. A microscopic clustering of cells was observed when Ca<SUP>2+</SUP> was added to ZB2. The AAg was in the range of 62%, 58% and 34% for ZB2, ZB1 and ZL, respectively and correlated to the SHb. The aggregation and SHb of the microbial cells increased with increasing ionic strength due to the repulsive steric or overlap forces between the polymer covered surfaces. Ca<SUP>2+</SUP> demonstrated a more significant effect on aggregation and SHb of microbial cells due to an attractive binding force.

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