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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.
In the same sequencing batch activated sludge reactor (SBR) were loaded with 1.5 g · L -1 80,140,200, and 300 mesh different particle size of magnetic activated carbon (reactor numbers were 2,3 , No.4 and No.5 respectively). Meanwhile, SBR reactor (No.1) with no magnetic activated carbon was used as a control group to study sludge volume index (SVI), particle size distribution, extracellular polymer (EPS) The content of extracellular protein (PN), extracellular polysaccharides (PS) and the decontamination performance of the sludge were studied.The results showed that the magnetic activated carbon with different particle size had certain influence on the granulation process of sludge, the particle size was too large and too small Activated sludge can easily form aerobic granular sludge with its “nucleation” carrier when the size of magnetic activated carbon is 140 mesh and 200 mesh, and The formed granular sludge has compact structure and fast sedimentation rate.Using Gaussian function to analyze the particle size distribution and standard deviation of the sludge, it was found that the average sludge size in the 50th, the 3rd and the 4th reactor of the reactor reached 780μm above, significantly higher than the other reactors, the standard deviation were 318.9μm and 362.3μm, the formation of the two reactors At the same time, adding different sizes of magnetic activated carbon could promote the increase of extracellular protein (PN) content and little effect on the content of extracellular polysaccharide (PS). However, the suitable magnetic activated carbon (140 mesh and 200 mesh) is more conducive to the secretion of PN in the sludge, and the PN / PS ratio of No.3 and No.4 reactors with obvious degree of granulation is higher than that of the other three reactors. The formation of carbon-based aerobic granular sludge complies with the “inert core model.” In addition, the removal rates of waste water TN and TP of reactors No. 3 and No. 4 were above 50% and 60%, respectively, higher than those of other reactors .