Yoon Seong-Hoon
Global Research Center, ONDEO Nalco Company, Naperville, IL 60563-1198, USA.
Water Res. 2003 Apr;37(8):1921-31. doi: 10.1016/S0043-1354(02)00578-X.
In order to prevent excess sludge production during wastewater treatment, a membrane bioreactor-sludge disintegration (MBR-SD) system has been introduced, where the disintegrated sludge is recycled to the bioreactor as a feed solution. In this study, a mathematical model was developed by incorporating a sludge disintegration term into the conventional activated sludge model and the relationships among the operational parameters were investigated. A new definition of F/M ratio for the MBR-SD system was suggested to evaluate the actual organic loading rate. The actual F/M ratio was expected to be much higher than the apparent F/M ratio in MBR-SD. The kinetic parameters concerning the biodegradability of organics hardly affect the system performance. Instead, sludge solubilization ratio (alpha) in the SD process and particulate hydrolysis rate constant (k(h)) in biological reaction determine the sludge disintegration number (SDN), which is related with the overall economics of the MBR-SD system. Under reasonable alpha and k(h) values, SDN would range between 3 and 5 which means the amount of sludge required to be disintegrated would be 3-5 times higher for preventing a particular amount of sludge production. Finally, normalized sludge disintegration rate (q/V) which is needed to maintain a certain level of MLSS in the MBR-SD system was calculated as a function of F/V ratio.
为了防止废水处理过程中产生过多污泥，引入了膜生物反应器 - 污泥解体（MBR - SD）系统，其中解体后的污泥作为进料溶液循环回生物反应器。在本研究中，通过将污泥解体项纳入传统活性污泥模型建立了数学模型，并研究了运行参数之间的关系。提出了一种用于MBR - SD系统的F/M比新定义，以评估实际有机负荷率。预计MBR - SD中的实际F/M比远高于表观F/M比。与有机物生物降解性相关的动力学参数对系统性能影响不大。相反，SD过程中的污泥溶解率（α）和生物反应中的颗粒水解速率常数（k(h)）决定了污泥解体数（SDN），这与MBR - SD系统的整体经济性有关。在合理的α和k(h)值下，SDN将在3到5之间，这意味着为防止产生特定量的污泥，需要解体的污泥量将高出3至5倍。最后，计算了在MBR - SD系统中维持一定水平的MLSS所需的归一化污泥解体率（q/V）作为F/V比的函数。
