好氧颗粒污泥膜生物反应器污泥性状研究

Sludge Characteristics in an Aerobic Granular Sludge Membrane Bioreactor

采用厌氧-好氧运行方式的颗粒污泥膜生物反应器(GMBR),连续运行近120 d表现出良好的有机物去除及同步硝化反硝化能力.对GMBR中污泥粒径分布变化研究表明,GMBR中污泥浓度的增加主要是由于粒径0.18-0.45 mm的小颗粒污泥及小于0.18 mm的絮状污泥的增加造成的,粒径大于0.45 mm的颗粒污泥能够基本稳定维持其颗粒形态,反应器运行末期,GMBR中颗粒污泥(粒径大于0.18 mm的污泥)含量稳定在污泥总量的60%-65%以上.污泥表面电荷量随着污泥组成形态的变化电负性逐渐增加,80 d后稳定在-0.42--0.80 meq.g-1之间.污泥表面电荷的负电性增加主要是由小于0.45 mm的污泥造成的,其中小于0.18 mm的絮状污泥对其影响最大.并且,污泥粒径越大污泥表面负电荷量越少,两者具有较好的线性关系.另外,GMBR中SVI稳定在60-90 mL/g之间,并且随着污泥表面电荷负电性的增加污泥SVI值增加,两者之间具有一定的相关性.

Granular sludge membrane bioreaetor（GMBR）, operated with alternating anaerobic-aerobic mode, showed good organics removal and simultaneous nitrification and denitrifieation（SND） performances during 120 clays operation. Moreover, sludge size distribution examination showed that the increase of sludge concentration in GMBR was mostly clue to the increase of small granular sludge with diameter between 0.18 - 0.45 mm and floeeulent sludge smaller than 0.18 ram, and most of granular sludge larger than 0.45 mm was stably existed in GMBR, at the end of operation granular sludge with diameter larger than 0.18ram remained 60% - 65% in GMBR. Sludge surface negative charge increased with the sludge size distribution variation, and surface charge remained- 0.42- -0.80 meq·g^-1 after 80 clays operation. The increase of sludge surface negative charge was mostly caused by sludge smaller than 0.45 mm, thereinto sludge smaller than 0.18 mm had the greatest effect. Moreover, results revealed that the sludge surface negative charge decreased as the sludge size increased, and a linear correlation can be obtained between sludge surface negative charge and sludge size. Sludge in GMBR had good settleability, and SVI was about 60 - 90 mug. Furthermore results showed that sludge surface charge was correlated with SVI, sludge SVI increased with surface negative charge increased.