降低负荷以提高反硝化颗粒污泥的稳定性  

Enhancing stability of denitrifying granular sludge by decreasing loading

作　　者：杨珊珊[1] 赵丰年[1] 金锡标[1] 徐宏勇[1] 刘勇弟[1] 

机构地区：[1]华东理工大学环境工程研究所,上海200237

出　　处：《环境工程学报》2009年第8期1379-1382,共4页Chinese Journal of Environmental Engineering

基　　金："十一五"国家科技支撑计划(2008BAE64B06)

摘　　要：在上流式污泥床反应器（USB）内，接种好氧活性污泥，以甲醇为碳源，NO3^-为电子受体，经过40多d培养，得到良好的反硝化颗粒污泥，粒径2～3mm，MLSS为36g／L，氮去除速率和COD去除速率分别在0．15gNO3-N／（gVSS·d）和0．8gCOD／（gVSS·d）。当负荷提高至6．44gNO3-N／（L·d）继续运行1周后，观察到反应器内颗粒污泥出现上浮，浓度降低，颗粒粒径多数在3～5mm，外观呈乳白色。为恢复反应器稳定运行，当负荷降至3．86gNO3-N／（L·d）时，上浮现象减轻，当负荷降至2．57gNO3-N／（L·d）时，上浮现象消失，颗粒污泥密度由不稳定时的1．0018g／cm^3提高到1．0126g／cm^3，颗粒粘连现象基本消失，污泥氮去除速率在0．19gNO3-N／（gVSS·d），连续运行30d，系统保持稳定。分析认为，颗粒污泥表面微生物生长速度过快是导致不稳定的主要因素，较长的泥龄有利于系统稳定。Well-formed denitrifying granular sludge was obtained within 40 days, when aerobic activated sludge was inoculated with methanol as a carbon source in upflow sludge bed reactor （USB）. The diameter of the mature sludge was 2 to 3 mm. MLSS of the USB was 36 g/L. It had a high sludge removal loading of N and COD, at 0. 15 g NO3-N/（g VSS · d） and 0. 8 g COD/（g VSS · d） respectively. When the number went up to 6.44 g NO3-N/（L· d） and stayed for a week, the MLSS began to decline rapidly with the floating of granular sludge. At this time, granular sludge was white and had a diameter of 3 - 5mm. Then reduced the volume loading. Floating phenomenon reduced when the figure was 3.86 g NO3-N/（L· d） to 5.14 g NO3-N/（ L · d） , and disappeared completely with a low volume loading at 2.57 g NO3-N/（ L · d）. The density of granules was increased from 1. 0018 g/cm3 , which was measured under unstable condition, to 1. 0126 g/cm3. Single granules＇ settleability was enhanced, adhesion of granules disappeared, N sludge removal loading was 0. 19 g NO3-N/（g VSS ·d）. The system maintained stable in 30 days＇ performance. The high growing rate of microorganism on the surface of granule is the main factor of instability, long solid retention time contributes to the system stability.

关 键 词：反硝化颗粒污泥 稳定性 负荷 

分 类 号：X703[环境科学与工程—环境工程]