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the treatment and disposal of sewage sludge is one of the hot spots in recent years, and the value of its energy utilization has gradually received attention by researchers. In this paper, the concept, yield, harm as well as the conventional disposal methods of sewage sludge are described, three kinds of main technologies of oil making from sewage sludge are introduced, including high temperature pyrolysis, low-temperature pyrolysis and direct thermo chemical liquefaction, and the research progress of these three technologies is reviewed.

The paper introduces the research status and progress of domestic and overseas researches on the effects of heavy metal ions on activated sludge microorganisms. The analysis of the research results show that the effects of heavy metals on microorganism vary with metal type, form and concentration.