2Al - Futaisi Ahmed, Jamrah Ahmad, Yaghi Basma, et al. Assessment of alternative management techniques of tank bottom pe- troleum sludge in Oman[J]. Journal of Hazardous Materials, 2007, 141(3) :557 -564.
3Machin - Ramirez C, Okoh A I, Morales D, et al. Slurry - phase biodegradation of weathered oily sludge waste [ J ]. Chemo- sphere, 2008, 70(4) :737 -744.