Overview of Bio-Oil from Sewage Sludge by Direct Thermochemical Liquefaction Technology

Jing Liu, Xiaoxiong Zhang, Guanyi Chen

School of Environmental Science and Technology, Tianjin University, Tianjin, China.

DOI: 10.4236/jsbs.2012.24017                

Abstract

Sewage sludge is an unavoidable secondary pollution produced in the process of sewage treatment. At present traditional methods of treating sludge (e.g. landfill, incineration or land application) have some disadvantages and shortages. Direct thermochemical liquefaction of sludge is a new treatment method, which has the advantage of both treatment and energy recovery. Research progress and application prospect of sludge liquefaction technology are widely reported, typical liquefaction process with bio-oil production and its main influencing factors are introduced. Besides, the devel- opment of this process is illustrated, and resource and energy recovery of this technology are pointed out to be the ten- dency of sludge treatment in the future.

Keywords

Bio-Oil; Direct Thermochemical Liquefaction; Sewage Sludge

Conflicts of Interest

The authors declare no conflicts of interest.

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