tailieunhanh - Wastewater Purification: Aerobic Granulation in Sequencing Batch Reactors - Chapter 15

Như thể hiện trong các chương trước, hiếu khí hạt là một môi trường phù hợp công nghệ sinh học để điều trị nhiều loại nước thải. Tương tự như để kỵ khí hạt, hạt hiếu khí là quá trình tự cố định vi khuẩn có nghĩa là thúc đẩy bởi áp lực chọn lọc trong các lò phản ứng hàng loạt trình tự (SBR) (xem chương 6). | 15 Filamentous Growth in an Aerobic Granular Sludge SBR Yu Liu and Qi-Shan Liu CONTENTS Causes of Filamentous Growth in the Activated Sludge Wastewater Substrate Availability. 260 Dissolved Oxygen Solids Retention Time SRT .261 Nutrient Outgrowth of Filamentous Bacteria in Aerobic Granular Sludge SBRs . 262 Causes of Filamentous Growth in Aerobic Granular Sludge Type of Long Solids Retention Time in Aerobic Granular Sludge Substrate Concentration and Concentration Dissolved Oxygen Deficiency in Aerobic Nutrient Deficiency in Aerobic Temperature Shift in Aerobic Granular Sludge Flow Patterns in Aerobic Granular Sludge Length of Aerobic Propagation Patterns of Filamentous Growth in Aerobic Granular Sludge Control Strategy for Filamentous INTRODUCTION As shown in the preceding chapters aerobic granulation is a tailored environmental biotechnology for treating a wide variety of wastewaters. Similar to anaerobic granulation aerobic granulation is a microbial self-immobilization process that is driven by selection pressures in the sequencing batch reactor SBR see chapter 6 . Experimental evidence shows instability of aerobic granules is the major technical 259 2008 by Taylor Francis Group LLC 260 Wastewater Purification problem encountered in operating an aerobic granular sludge SBR while filamentous growth has been commonly observed in aerobic granular sludge SBRs Tay Liu and Liu 2001 Pan 2003 McSwain Irvine and Wilderer 2004 F. Wang et al. 2004 Schwarzenbeck Borges and Wilderer 2005 . Once filamentous growth dominates the reactor settleability of aerobic granules becomes poor. This .