通过对城市污水二级出水中溶解性有机物（ DOM）的Zeta电位和粒径变化规律的研究，探讨pH值对二级出水中DOM的荷电状态、聚集状态与光谱特性的影响．结果表明，城市污水二级出水中DOM在pH值小于4和大于10时具有自我凝聚的特性．随pH值增大，DOM的Zeta电位绝对值逐渐升高．pH值小于4时，随pH值降低，DOM的聚合度增大，粒径迅速增大，将荧光基团包裹在内，荧光峰荧光强度降低．随pH值增大，pH值在5—9时，DOM粒子聚合度降低，粒径减小，荧光强度有所增强；pH值大于10时，DOM的聚合度增大而将发射荧光基团包裹在内，荧光强度减弱． DOM的荧光等高线谱图表明其主要含有难降解的腐殖酸类有机物．荧光指数FI值在1．86—2．96内，表明DOM主要是生物来源且芳香度较低．DOM的E3／E4值表明随pH值增大， DOM腐殖化程度逐渐减小．UV253／UV203比值说明pH值不会明显地改变二级出水DOM苯环的取代程度．
The effect of pH on the charge aggregation and spectral characteristics of dissolved organic matters( DOM) in secondary effluent of municipal wastewater was investigated by measuring the Zeta potential and the particle size at different pH values. It was found that the Zeta potential of DOM increased gradually with the increae of pH value and the DOM self?agglomerated at pH below 4 and above 10. At pH below 4 the polymerization degree of DOM increased and the particle size increased rapidly with decreasing pH, in which the fluorscent groups were wrapped so the fluorescence intensity reduced. With pH increasing from 5 to 9, the polymerization degree of DOM particle reduced, and the particle size became smaller so that the fluorescence intensity increased. The fluorescence contour plot spectra of DOM showed that the refractory humic?like components were the dominant component of DOM. FI falls within the range of 1.86 to 2.96, which showed that the DOM was primarily from biological source and had lower aromaticity. The E3/E4 indicated that the degree of DOM humification gradually decreases with increasing pH. UV253/UV203 showed that the substitution degree of benzene in DOM did not obviously change with pH value.
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