tailieunhanh - Wastewater Purification: Aerobic Granulation in Sequencing Batch Reactors - Chapter 17 (end)

Aerobic công nghệ hạt đã được áp dụng cho điều trị cao hiệu quả của một rộng nhiều loại nước thải bao gồm nước thải độc hại, và nó đã được chứng minh trong các nhà máy quy mô thí điểm (de Bruin et al 2004; de Kreuk, de Bruin, và van Loosdrecht 2004; Liu et al. 2005), trong khi ứng dụng quy mô đầy đủ của nó chưa được báo cáo. Trong thực tế công nghiệp, khởi động nhanh chóng và dễ dàng chăn upflow bùn kỵ khí (UASB) lò phản ứng có thể được thực hiện bằng cách gieo hạt hạt kỵ khí. | 17 Pilot Study of Aerobic Granulation for Wastewater Treatment Qi-Shan Liu and Yu Liu CONTENTS Startup of Pilot-Scale Aerobic Granular Sludge Comparison of Pilot- and Laboratory-Scale Characteristics of Aerobic Granules Developed in Pilot- and Laboratory-Scale Granule Size and Settling Physical Microbial Startup of a Pilot-Scale SBR Using Stored Granules as Startup of a Pilot-Scale SBR Using Activated Sludge as INTRODUCTION Aerobic granulation technology has been applied for the high-efficiency treatment of a wide variety of wastewater including toxic wastewater and it has been demonstrated in pilot-scale plants de Bruin et al. 2004 de Kreuk de Bruin and van Loosdrecht 2004 Liu et al. 2005 while its full scale application has not yet been reported. In industrial practice the fast and easy startup of upflow anaerobic sludge blanket UASB reactors can be realized by seeding anaerobic granules directly into the reactor. This will significantly reduce the time required for anaerobic granulation which usually takes 2 to 8 months. A similar startup strategy is also applicable in initiating aerobic granular sludge sequencing batch reactors SBRs . Existing evidence shows that aerobic granules can be stored over a period of 7 weeks and its activity quickly recovered Zhu and Wilderer 2003 while J. H. Tay Liu and Liu 2002 also found that aerobic granules can be stably stored for 4 months at 4 C. These findings suggest that use of the stored aerobic granules as seed would be feasible in full-scale operation of aerobic granular sludge SBRs. 301 2008 by Taylor Francis Group LLC 302 Wastewater Purification FIGURE Morphology of bioparticles in the pilot-scale SBR at day 1 A day 5 B day 20 C and day 65 D . Scale bar 4 mm. From Tay J. H. et al. 2004. .