Chen Yao, Jiang Wenju, Liang David Tee, Tay Joo Hwa
College of Architecture and Environment, Sichuan University, Chengdu 610065, People's Republic of China.
Appl Microbiol Biotechnol. 2008 May;79(2):301-8. doi: 10.1007/s00253-008-1421-6.
Biodegradation, kinetics, and microbial diversity of aerobic granules were investigated under a high range of organic loading rate 6.0 to 12.0 kg chemical oxygen demand (COD) m(-3) day(-1) in a sequencing batch reactor. The selection and enriching of different bacterial species under different organic loading rates had an important effect on the characteristics and performance of the mature aerobic granules and caused the difference on granular biodegradation and kinetic behaviors. Good granular characteristics and performance were presented at steady state under various organic loading rates. Larger and denser aerobic granules were developed and stabilized at relatively higher organic loading rates with decreased bioactivity in terms of specific oxygen utilization rate and specific growth rate (muoverall) or solid retention time. The decrease of bioactivity was helpful to maintain granule stability under high organic loading rates and improve reactor operation. The corresponding biokinetic coefficients of endogenous decay rate (kd), observed yield (Yobs), and theoretical yield (Y) were measured and calculated in this study. As the increase of organic loading rate, a decreased net sludge production (Yobs) is associated with an increased solid retention time, while kd and Y changed insignificantly and can be regarded as constants under different organic loading rates.
在序批式反应器中，研究了在6.0至12.0 kg化学需氧量（COD）m⁻³ d⁻¹的高有机负荷率下好氧颗粒的生物降解、动力学和微生物多样性。不同有机负荷率下不同细菌种类的选择和富集对成熟好氧颗粒的特性和性能有重要影响，并导致颗粒生物降解和动力学行为的差异。在各种有机负荷率下的稳态下呈现出良好的颗粒特性和性能。在相对较高的有机负荷率下，形成了更大、更致密的好氧颗粒并使其稳定，同时就特定氧利用率、比生长速率（μ总）或固体停留时间而言生物活性降低。生物活性的降低有助于在高有机负荷率下维持颗粒稳定性并改善反应器运行。本研究测量并计算了相应的内源衰减率（kd）、观测产率（Yobs）和理论产率（Y）的生物动力学系数。随着有机负荷率的增加，净污泥产量（Yobs）的降低与固体停留时间的增加相关，而kd和Y变化不显著，在不同有机负荷率下可视为常数。
