中文摘要：

破解城市剩余污泥中的微生物细胞，释放细胞内有机成分，是提高污泥厌氧消化效率的关键问题。因此选取城市剩余污泥为试样，分别采用直流、交流电晕放电对其实施处理，采用重铬酸钾法测量污泥试样的溶解性化学需氧量（SCOD），分析电晕引发形式、电压极性、幅值及频率等参数对剩余污泥微生物细胞破解效果的影响规律。结果显示，采用直流或交流电晕处理污泥均可使其SCOD增大，达到破解污泥中微生物细胞的目的。当采用直流电晕破解污泥时，随着正直流电压从1kV升高至5kV，SCOD增长率从15．6％减小至6．8％；随着负直流电压从-1kV提高至-5kV，SCOD增长率从0．1％上升至21．4％。当采用交流电晕处理污泥时，其SCOD增长率与交流电压频率和幅值密切相关，交流电晕破解污泥的效果优于直流电晕。分析认为，电晕放电产生的羟基自由基、臭氧等强氧化性物质是导致微生物细胞膜破解，胞内有机成分释放的主要原因。随着电晕放电参数的改变，细胞膜破解的微观物理过程以及细胞外有机成分的降解过程均受到影响，从而导致SCOD增长率的变化。

英文摘要：

The disruption of microbial cells in urban excess sludge to release the intracellular organics is an important step for improving the efficiency of anaerobic digestion. So, excess sludge was employed to investigate the disruption behav- ior of the microbial cells within the sludge by means of DC and AC corona discharge. The Soluble Chemical Oxygen Demand （SCOD） of the sludge sample was measured to evaluate the disruption performance of the cells,and the effects of DC voltage magnitude, polarity and AC voltage frequency on the performance were discussed. The results indicated that the microbial cells could be disrupted by either DC or AC corona, which leaded to the increase in SCOD. With the appli- cation of DC corona, the growth rate of SCOD decreased from 15.6% to 6.8% as the positive DC voltage increased from 1 kV to 5 kV, whereas the growth rate of SCOD increased from 0.1% to 21.4% as the negative DC voltage grew from -1 kV to -5 kV. With the application of AC corona, the increase rate of SCOD showed a close relationship to frequency and magnitude. AC corona exhibited a better treatment performance compared with DC corona. It is suggested that the disruption of the cells, as well as the release of intraceUular organics, is due to the generation of oxidative species, such as hydroxyl radical and ozone within the corona discharge. The microphysical processes of cells disruption and extracellular organics degradation varies as a function of the parameters of corona discharge, which leads to the variation of SCOD in- crease rate.