Li Jun, Liu Jun, Wang Danjun, Chen Tao, Ma Ting, Wang Zhihong, Zhuo Weilong
College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China.
College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China.
Int J Environ Res Public Health. 2015 Aug 21;12(8):10056-65. doi: 10.3390/ijerph120810056.
Micropowder (20-250 µm) made from ground dry waste sludge from a municipal sewage treatment plant was added in a sequencing batch reactor (R2), which was fed by synthetic wastewater with acetate as carbon source. Compared with the traditional SBR (R1), aerobic sludge granulation time was shortened 15 days in R2. Furthermore, filamentous bacteria in bulking sludge were controlled to accelerate aerobic granulation and form large granules. Correspondingly, the SVI decreased from 225 mL/g to 37 mL/g. X-ray Fluorescence (XRF) analysis demonstrated that Al and Si from the micropowder were accumulated in granules. A mechanism hypotheses for the acceleration of aerobic granulation by adding dry sludge micropowder is proposed: added micropowder acts as nuclei to induce bacterial attachment; dissolved matters from the micropowder increase abruptly the organic load for starved sludge to control overgrown filamentous bacteria as a framework for aggregation; increased friction from the movement of micropowder forces the filaments which extend outwards to shrink for shaping granules.
将城市污水处理厂的干污泥研磨制成的微粉（20 - 250微米）添加到序批式反应器（R2）中，该反应器由以乙酸盐为碳源的合成废水进料。与传统的序批式反应器（R1）相比，R2中的好氧污泥颗粒化时间缩短了15天。此外，膨胀污泥中的丝状菌得到控制，以加速好氧颗粒化并形成大颗粒。相应地，污泥体积指数（SVI）从225 mL/g降至37 mL/g。X射线荧光（XRF）分析表明，微粉中的铝和硅积累在颗粒中。提出了添加干污泥微粉加速好氧颗粒化的机制假说：添加的微粉作为核诱导细菌附着；微粉中的溶解物质突然增加了饥饿污泥的有机负荷，以控制过度生长的丝状菌作为聚集的框架；微粉运动增加的摩擦力迫使向外延伸的丝状菌收缩以形成颗粒。
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