Transformation between flocs and aggregates in the conditioned sludge suspensions during a rotational test using a torque rheometer
Transformation between flocs and aggregates in the conditioned sludge suspensions during a rotational test using a torque rheometer
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使用扭矩流变仪进行旋转测试期间调节后的污泥悬浮液中絮凝体和聚集体之间的转化
DOI：
10.1016/j.powtec.2010.12.018
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发表时间：
2011-03
影响因子：
5.2
通讯作者：
Mahmudov, R.
中科院分区：
文献类型：
--
作者：
Wang, Y. L.;Dentel, S. K.;Mahmudov, R.
絮凝试验仪是一种典型的用于研究絮凝剂和废水污泥絮凝特性的扭矩流变仪。本研究展示了条件厌氧消化污泥（ADS）流变学、几何特性的变化，以分析在絮凝流变仪的旋转试验中絮凝体和团聚体之间的转化。结果表明，以ADS的扭矩-时间曲线下面积为基础，聚合物zetag7557的最佳剂量时，网络强度和抗剪切能力达到最大。当聚合物剂量达到最佳剂量时，ADS悬浮液中出现较大的聚合体，甚至出现较大的污泥团块，并且随着剪切时间的延长，聚合体的平均尺寸继续增大。之后，随着剪切作用的延长，这些集料破碎成更小的集料或直接转化成越来越小的絮凝体。转矩-时间曲线中相应的转矩值与上述变化规律相似。在上述过程中，产生大团聚体的条件ADS悬浮液形成的网络最强，而单个团聚体最大或团聚体/絮凝体平均粒径最高的ADS悬浮液并不能保证形成最强的网络。条件ADS絮凝体的分形维数峰值与ADS悬液力矩-时间曲线的峰值高度不一致。
Floccky tester is a typical torque rheometer used to study flocculants and flocculation characteristics of wastewater sludges. This study presents the variations in rheological, geometric characteristics of conditioned anaerobic digested sludge (ADS) to analyze the transformation between flocs and aggregates during a rotational test with a floccky rheometer. The results revealed that the network strength and resistance to shear reach their maximum values at the optimum dose of polymer zetag7557 on the basis of the area under torque-time curves of ADS. Large aggregates, even big sludge lumps, were observed as soon as the optimum polymer dose was injected into the ADS suspensions, and they continued to grow in average size as the shear duration was prolonged. Afterwards, these aggregates broke into smaller ones or were directly transformed into smaller and smaller flocs with the extension of shear application. The corresponding torque values in the torque-time curve showed similar behavior to the above variations. During the above process, the strongest network formed in conditioned ADS suspensions in which large aggregates were generated, while the ADS suspension with the largest single aggregate or the highest average size of aggregates/flocs did not assure the strongest network. The climax of fractal dimensions for conditioned ADS flocs were not coincident with that of the peak height in the torque-time curves for these ADS suspensions.
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影响因子：
2.7
作者：
S. Langer;R. Klute;H. Hahn
通讯作者：
S. Langer;R. Klute;H. Hahn
DOI：
10.1061/(asce)0733-9372(1999)125:12(1133
发表时间：
1999-12
影响因子：
2.2
作者：
M. Abu-orf;S. Dentel
通讯作者：
M. Abu-orf;S. Dentel
影响因子：
6.9
作者：
Yili Wang;Jia Lu;Du Baiyu;Baoyou Shi;Dongsheng Wang
通讯作者：
Yili Wang;Jia Lu;Du Baiyu;Baoyou Shi;Dongsheng Wang
影响因子：
2.7
作者：
M. Abu-orf;S. Dentel
通讯作者：
M. Abu-orf;S. Dentel
影响因子：
2.7
作者：
H. W. Campbell;P. Crescuolo
通讯作者：
H. W. Campbell;P. Crescuolo