科研之友
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摘要
Thermophilic anaerobic digestion is significantly efficient to remove pathogens, but has been limited by an elevated energy requirement for heating the digester. However, recently it was reported that incorporating a 60 or 70 degrees C pretreatment phase can dramatically increase pathogen inactivation performance without decreasing net energy capture from anaerobic digestion. The objective of this research is to investigate net energy production and pathogenic bacteria inactivation during temperature phased anaerobic digestion (TPAD) of sewage sludge with different sludge retention time (SRT) of thermophilic stage. With the thermophilic SRT from 1 d to 7 d, the VS reduction and methane production increased and remained relatively stable for 5 and 7d. The net energy also increased with the SRT of thermophilic stage but decreased from 5d, with the most net energy production at the 5d. An increase in SRT of thermophilic stage from id to 3d substantially improved the pathogen decay in sewage sludge, and the contents of E. coli, Salmonella sp. and Shigella sp. were below the detection limit when the thermophilic SRT more than 2, 2 and 3d, respectively. This study confirms that TPAD with appropriate SRT of thermophilic stage is capable of highly efficient inactivation of bacterial pathogens in sewage sludge, and higher net energy production than that from conventional mesophilic and thermophilic treatment alone.
- 出版日期2014
- 单位江南大学
