Overview of the state of the art of processes and technical bottlenecks for coal gasification wastewater treatment.CGWW is major waste stream resulting from a number of activities of the low/medium temperature gasification unit that occurs during the production of natural gas.  So far, various technologies have been applied for treatment of CGWW, while few reviews are available in the literature.  Thus, this review attempts to offer a comprehensive picture about CGWW.  An overview about pretreatment, biological and advanced processes for treatment of CGWW is presented, and the degradation mechanism of toxic and refractory pollutants is also elaborated.  Finally, the prospects of treatment for CGWW are discussed based on the concept of "wastewater is money". 
CGWW
Overview of the state of the art of processes and technical bottlenecks for coal gasification wastewater treatment.CGWW is major waste stream resulting from a number of activities of the low/medium temperature gasification unit that occurs during the production of natural gas.  So far, various technologies have been applied for treatment of CGWW, while few reviews are available in the literature.  Thus, this review attempts to offer a comprehensive picture about CGWW.  An overview about pretreatment, biological and advanced processes for treatment of CGWW is presented, and the degradation mechanism of toxic and refractory pollutants is also elaborated.  Finally, the prospects of treatment for CGWW are discussed based on the concept of "wastewater is money". 
CGWW
Overview of the state of the art of processes and technical bottlenecks for coal gasification wastewater treatment.CGWW is major waste stream resulting from a number of activities of the low/medium temperature gasification unit that occurs during the production of natural gas.  So far, various technologies have been applied for treatment of CGWW, while few reviews are available in the literature.  Thus, this review attempts to offer a comprehensive picture about CGWW.  An overview about pretreatment, biological and advanced processes for treatment of CGWW is presented, and the degradation mechanism of toxic and refractory pollutants is also elaborated.  Finally, the prospects of treatment for CGWW are discussed based on the concept of "wastewater is money". 
CGWW