Inizan M, Freval A, Cigana J, Meinhold J
Anjou-Recherche/VEOLIA Water, chemin de la Digue, PO BOX 76, 78603 Maisons-Laffitte, France.
Water Sci Technol. 2005;52(10-11):335-43.
Aerobic granulation seems to be an a attractive process for COD removal from industrial wastewater, characterised by a high content of soluble organic compounds. In order to evaluate the practical aspects of the process, comparative experimental tests are performed on synthetic and on industrial wastewater, originating from pharmaceutical industry. Two pilot plants are operated as sequencing batch bubble columns. Focus was put on the feasibility of the process for high COD removal and on its operational procedure. For both wastewaters, a rapid formation of aerobic granules is observed along with a high COD removal rate. Granule characteristics are quite similar with respect to the two types of wastewater. It seems that filamentous bacteria are part of the granule structure and that phosphorus precipitation can play an important role in granule formation. For both wastewaters similar removal performances for dissolved biodegradable COD are observed (> 95%). However, a relatively high concentration of suspended solids in the outlet deteriorates the performance with regard to total COD removal. Biomass detachment seems to play a non-negligible role in the current set-up. After a stable operational phase the variation of the pharmaceutical wastewater caused a destabilisation and loss of the granules, despite the control for balanced nutrient supply. The first results with real industrial wastewater demonstrate the feasibility of this innovative process. However, special attention has to be paid to the critical aspects such as granule stability as well as the economic competitiveness, which both will need further investigation and evaluation.
好氧颗粒化似乎是一种从含有高浓度可溶性有机化合物的工业废水中去除化学需氧量（COD）的有吸引力的工艺。为了评估该工艺的实际应用情况，对源自制药行业的合成废水和工业废水进行了对比实验测试。两座中试装置作为序批式鼓泡塔运行。重点关注该工艺实现高COD去除率的可行性及其操作程序。对于这两种废水，均观察到好氧颗粒迅速形成，同时COD去除率很高。就这两种类型的废水而言，颗粒特性颇为相似。丝状细菌似乎是颗粒结构的一部分，并且磷沉淀在颗粒形成过程中可能发挥重要作用。对于这两种废水，溶解的可生物降解COD的去除性能相似（>95%）。然而，出口处相对较高浓度的悬浮固体降低了总COD去除方面的性能。在当前的装置中，生物量脱落似乎起到了不可忽视的作用。经过稳定运行阶段后，尽管对营养物供应平衡进行了控制，但制药废水的变化仍导致颗粒不稳定并损失。来自实际工业废水的初步结果证明了这种创新工艺的可行性。然而，必须特别关注颗粒稳定性以及经济竞争力等关键方面，这两方面都需要进一步研究和评估。
