DC反应器处理中药废水过程中出水的光谱分析

采用三维荧光(EEM)与傅立叶红外(FTIR)光谱技术,对不同运行条件下,新型双循环(DC)厌氧反应器处理中药废水的出水情况进行了分析,以期为厌氧反应器的有效监控提供新思路.结果表明,在HRT为24h时,COD去除率为94%左右,平均产气率达到0.37m3CH4/kgCOD,出水的EEM光谱中,Ex/Em=420/470nm处出现了明显的辅酶F420吸收峰;而HRT减少为12h后,虽然COD去除率仍达到90%左右,但出水EEM光谱中,辅酶F420的吸收峰有所降低,并出现了类富里酸的吸收峰,表明不宜再继续减少HRT.当温度由30oC降低为20oC时,温度的变化影响了厌氧污泥的性状,使得出水的FTIR光谱中3400cm-1处的吸收峰由原来的钝峰变为尖峰.而在进水中添加大黄酸后,造成了反应器内有机酸的累积,产甲烷菌活性受到严重影响,出水的EEM光谱中,腐殖酸与类富里酸的吸收峰显著增强.

Analysis of spectra of effluent from DC reactor for treating traditional Chinese medicine wastewater

The characteristics of effluent of a novel double circle (DC) reactor for treating the wastewater from traditional Chinese medicine were investigated at different operation conditions. The analytical techniques including 3D excitation- emission matrix (EEM) fluorescence spectra and fourier transform infrared (FTIR) spectra were adopted, which could provide new thoughts for effective monitoring of anaerobic reactor performance. The results showed that when HRT was 24h, the DC anaerobic reactor could achieve the COD removal efficiency of 94%, and the methane production rate of 0.37m3CH4/kg.COD. At the same time, the absorption peak of coenzyme F420 (Ex/Em = 420/470nm) appeared obviously in the EEM spectra of the effluent. When HRT reduced to 12h, although the COD removal rate was 90%, the absorption peak coenzyme F420 decreased, whereas the absorption peak of fulvic acid-like appeared, indicating that HRT should not be reduced further. When the temperature was reduced from to 30℃ to 20℃, the characteristics of anaerobic sludge were influenced by the variation of temperature. The absorption peak at 3400cm-1changed from blunt peak to sharp peak in the FTIR spectra of the effluent. Particularly, the addition of rhein in the influent caused the accumulation of organic acids in the reactor. Hence, the methanogens activity was severely inhibited. Meanwhile, the absorption peaks of humic acid and fulvic acid-like were significantly enhanced in the EEM spectra of the effluent.