超市废水的膜生物反应器中污泥特性之变化

Transformation of Sludge Characteristics in a Full-Scale Submerged Membrane Bioreactor(MBR) for Supermarket Wastewater Treatment

在以处理超市废水实际工程的基础上,通过对污泥性质中的胞外聚合物(EPS)、溶解性微生物产物(SMP)、污泥粒径分布(PSD)变化的分析,得出污泥性质在接种膜生物反应器(MBR)后发生了明显的变化。对SMP的荧光分析发现,芳香族蛋白质类物质的量随着运行时间的增加有减小的趋势,而色氨酸类蛋白质类物质的量则相反。同时,发现EPS中荧光峰发生了显著的位移,说明了EPS性质发生了变化;通过对污泥的红外分析,发现污泥主要以糖类、蛋白质和脂肪族类物质为主,而随着时间的变化,污泥中的代表羟基基团的峰强度发生了明显的变化,说明污泥性质发生了变化;此外,通过PSD分析发现,污泥粒径中大粒径颗粒(大于100μm)是逐渐减小的,而小粒径颗粒(10μm)逐渐增多。

On the basis of a full-scale submerged membrane bioreactor （MBR） for supermarket wastewater treatment, soluble microbial products （SMP）, extracellular polymer substances （EPS） and particle size distribution （PSD） in the mixed liquor were investigated. It was found that the properties of sludge obviously changed after inoculation of sludge in MBR. During the operation, it was observed that the amount of aromatic protein-like substances in the SMP gradually decreased with operation time; in contrast, the amount of tryptophan protein-like substances slowly increased. Meanwhile, the results show that the characteristics of EPS changes due to the shift of locations of peaks during the operation. According to the Fourier-transform infrared （FT-IR） spectroscopic analysis, it is concluded that sludge mainly consists of polysaccharides, proteins and aliphatic substances; with the increase of operation time, the change of intensity of peak, which is attributed to function group of O-H, implies that the change of sludge properties during the operation. Moreover, PSD analysis indicates that with the increase of operation time the particles （〉100μm） decreases, whereas, the particles （〈10μm） increases.