Kooijman Guido, Lopes Wilton, Zhou Zhongbo, Guo Hongxiao, de Kreuk Merle, Spanjers Henri, van Lier Jules
Department of Watermanagement, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628BC Delft, The Netherlands.
Department of Sanitary and Environmental Engineering, University of Paraiba State, Avenida Juvencio Arruda SN, Bairro Universitario, Campina Grande, Paraíba 58429-500, Brazil.
Membranes (Basel). 2017 Mar 23;7(2):18. doi: 10.3390/membranes7020018.
In this work, we investigated the effects of flocculation aid (FA) addition to an anaerobic dynamic membrane bioreactor (AnDMBR) (7 L, 35 °C) treating waste-activated sludge (WAS). The experiment consisted of three distinct periods. In period 1 (day 1-86), the reactor was operated as a conventional anaerobic digester with a solids retention time (SRT) and hydraulic retention time (HRT) of 24 days. In period 2 (day 86-303), the HRT was lowered to 18 days with the application of a dynamic membrane while the SRT was kept the same. In period 3 (day 303-386), a cationic FA in combination with FeCl₃ was added. The additions led to a lower viscosity, which was expected to lead to an increased digestion performance. However, the FAs caused irreversible binding of the substrate, lowering the volatile solids destruction from 32% in period 2 to 24% in period 3. An accumulation of small particulates was observed in the sludge, lowering the average particle size by 50%. These particulates likely caused pore blocking in the cake layer, doubling the trans-membrane pressure. The methanogenic consortia were unaffected. Dosing coagulants and flocculants into an AnDMBR treating sludge leads to a decreased cake layer permeability and decreased sludge degradation.
在本研究中，我们考察了向处理剩余活性污泥（WAS）的厌氧动态膜生物反应器（AnDMBR，7升，35℃）中添加助凝剂（FA）的效果。实验包括三个不同阶段。在阶段1（第1 - 86天），反应器作为传统厌氧消化器运行，固体停留时间（SRT）和水力停留时间（HRT）均为24天。在阶段2（第86 - 303天），应用动态膜将HRT降至18天，而SRT保持不变。在阶段3（第303 - 386天），添加了阳离子FA与FeCl₃的混合物。添加物导致粘度降低，预期这会提高消化性能。然而，FA导致底物不可逆结合，使挥发性固体的破坏率从阶段2的32%降至阶段3的24%。在污泥中观察到小颗粒的积累，平均粒径降低了50%。这些颗粒可能导致滤饼层的孔隙堵塞，使跨膜压力加倍。产甲烷菌群未受影响。向处理污泥的AnDMBR中投加凝聚剂和絮凝剂会导致滤饼层渗透率降低和污泥降解减少。
