微生物絮凝剂促进厌氧污泥颗粒化及其机制的研究

以市政污水消化污泥为种泥，一组投加微生物絮凝剂MBF21，另一组不投加MBF21作为对照，研究了微生物絮凝剂MBF21在低浓度下UASB反应器启动过程中厌氧污泥颗粒化的作用机理．在为期102d的实验中，对厌氧污泥颗粒的形成期、成长期、成熟期进行了系统的考察．至实验结束时，投加微生物絮凝剂组的厌氧颗粒污泥平均直径比对照组大0．3mm，产甲烷活性比对照组高31％以上．对厌氧颗粒污泥的扫描电镜及荧光显微照片观察中均发现了大量产甲烷菌．对微生物絮凝剂的红外光谱分析及污泥性能的测定结果确定了微生物絮凝剂促进厌氧污泥颗粒化的作用主要是吸附架桥．

Mechanism of anaerobic granulation enhancement with bio-flocculant

Seeded with municipal anaerobic digested sludge, one (R1) was added with a bio-flocculant MBF21, the other (R2) was the control without any flocculant addition during their start-up of UASB treating low concentration wastewater. And the impact and mechanism of bio-flocculant MBF21 on anaerobic granulation were investigated. As the experiments ended, the granular sludge size from R1 was 0.3 mm larger than that from R2; and the special methanogenic activity (SMA) of granular sludge from R1 was 31% higher than that from R2. The properties of the anaerobic sludge during different period in the experiments were measured with SEM and fluorescence microscope photos. The results confirmed that it was the absorptive bridge between bio-flocculant and anaerobic microbes that enhancing the anaerobic granulation.