| SBR加载不同粒径磁性活性炭对其污泥颗粒化进程的影响机制 |
| 摘要点击 1567 全文点击 527 投稿时间：2017-03-19 修订日期：2017-05-17 |
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| 中文关键词 污泥颗粒化 磁性活性炭 好氧颗粒污泥 粒径 |
| 英文关键词 sludge granulation magnetic activated carbon aerobic granular sludge particle size |
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| 中文摘要 |
| 在相同序批式活性污泥反应器（SBR）中分别加载1.5 g·L-1的80、140、200、和300目不同粒径的磁性活性炭（反应器编号依次为2、3、4、5号），同时以不投加磁性活性炭的SBR反应器（1号）作为对照组，研究各反应器污泥体积指数（SVI）、粒径分布特征、胞外聚合物（EPS）中胞外蛋白（PN）、胞外多糖（PS）的含量变化规律以及除污性能.结果表明，不同粒径磁性活性炭对污泥颗粒化进程有一定的影响，粒径过大、过小对促进污泥颗粒化进程的强化作用不明显，当磁性活性炭的粒径为140目和200目时，活性污泥很容易以其作为"成核"载体快速形成好氧颗粒污泥，并且形成的颗粒污泥结构紧密，沉降速率快.采用高斯函数分析污泥粒径分布和标准偏差发现，反应器运行的第50 d，3号和4号反应器内污泥平均粒径均达到了780μm以上，明显高于其他反应器，标准偏差分别为318.9μm和362.3μm，两反应器内形成的颗粒污泥粒径较均匀，处理系统较稳定.与此同时，投加不同粒径的磁性活性炭均有利于促进污泥胞外蛋白质PN含量的增加，对胞外多糖PS的含量影响不大；但合适的磁性活性炭粒径（140目和200目）越有利于污泥PN的分泌，颗粒化程度明显的3号和4号反应器的PN/PS比值均高于其他3个反应器.磁性炭基好氧颗粒污泥的形成符合"惰性内核模型".此外，3号、4号反应器对废水TN和TP的去除率分别达到50%和60%以上，均高于其他反应器. |
| 英文摘要 |
| In this paper, 1.5 g·L-1 of magnetic activated carbon with different particle sizes being 80, 140, 200, and 300 mesh (numbered 2, 3, 4, 5) were inoculated into the same sequencing batch reactor (SBR). The sludge volume index (SVI), particle size distribution characteristics, changes of extracellular proteins (PN), polysaccharide (PS), and polymeric substances (EPS) and their decontamination capability were studied and compared with a control group without addition (numbered 1). The results show that different particle diameters of magnetic activated carbon have certain influences on the granulation process. For example, it is easier for activated sludge to form aerobic granular sludge (AGS) when particle size are 140 mesh and 200 mesh acting as an inner core. Under these conditions, the AGS has a close structure and good sedimentation characteristics. Gaussian distribution was adopted to analyze the characteristics of Tparticle size distribution and standard deviations. The average diameter of the sludge in 3# and 4# all reached 780 μm within 50 days, which was higher than other reactors, with the same standard deviations being 318.9 μm and 362.3 μm respectively, which is lower than 2# and 3#. Besides, the granular sludge formed in both reactors was uniform in size and stable in operation. Different particle sizes of magnetic activated carbon were beneficial for the enhancement of proteins (PN), especially those with appropriate diameters (140 and 200 mesh), but had little effects on polysaccharides (PS). The formation of aerobic granular sludge based-magnetic activated carbon was in accordance with the inert kernel model. Meanwhile, the PN/PS in 3# and 4# were obviously higher than other SBRs with the same removal rate of TN and TP reaching 50% and 60% respectively. |
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