Transformation and performance of granular sequence batch reactor under conventional organic loading rate condition
来源期刊：中南大学学报(英文版)2014年第7期
论文作者：ZHONG Chen(钟晨) WANG Ya-qin(王亚芹) Lü Jun-ping(吕俊平) LI Yao-chen(李耀辰) WANG Yong-jian(王永建) ZHU Jian-rong(竺建荣)
文章页码：2819 - 2825
Key words：aerobic granular; conventional organic loading rate; filamentous microorganisms; fungal granules; sequence batch reactor
Abstract: Laboratory experiments were conducted to investigate the transformation and performance of a granular sequence batch reactor (SBR) under the conventional organic loading rate (OLR) condition. Aerobic granules were successfully cultivated in a SBR by means of alternative feeding load combined with reducing settling time after 60 d operational period. Subsequently, the black fungal granules were presented in reactor because of the filamentous overgrowth on the surface of aerobic granules. A small amount of fungal granules had no effect on the performance of granular SBR. Aerobic granules completely vanished and fungal granules eventually became the dominant species in subsequent 90 d operation after granulation. The three-dimensional excitation emission matrix (EEM) spectra result shows that the extracellular polymeric substances (EPS) component in both granules has no much difference, whereas the content of EPS in fungal granules is higher than that in bacterial granules. Due to their low bioactivity, the chemical oxidation demand (COD) and NH4-N removal efficiencies gradually decrease from 90.4%–96.5% and 99.5% to 71.8% and 32.9% respectively while the fungal granules become dominant in the SBR.
ZHONG Chen(钟晨)1, WANG Ya-qin(王亚芹)1, Lü Jun-ping(吕俊平)1, LI Yao-chen(李耀辰)1, WANG Yong-jian(王永建)2, ZHU Jian-rong(竺建荣)1
(1. School of Environment, Beijing Normal University, Beijing 100875, China;
2. State Key Laboratory of Water Simulation (Beijing Normal University), Beijing 100875, China)
Abstract:Laboratory experiments were conducted to investigate the transformation and performance of a granular sequence batch reactor (SBR) under the conventional organic loading rate (OLR) condition. Aerobic granules were successfully cultivated in a SBR by means of alternative feeding load combined with reducing settling time after 60 d operational period. Subsequently, the black fungal granules were presented in reactor because of the filamentous overgrowth on the surface of aerobic granules. A small amount of fungal granules had no effect on the performance of granular SBR. Aerobic granules completely vanished and fungal granules eventually became the dominant species in subsequent 90 d operation after granulation. The three-dimensional excitation emission matrix (EEM) spectra result shows that the extracellular polymeric substances (EPS) component in both granules has no much difference, whereas the content of EPS in fungal granules is higher than that in bacterial granules. Due to their low bioactivity, the chemical oxidation demand (COD) and NH4-N removal efficiencies gradually decrease from 90.4%–96.5% and 99.5% to 71.8% and 32.9% respectively while the fungal granules become dominant in the SBR.
Key words:aerobic granular; conventional organic loading rate; filamentous microorganisms; fungal granules; sequence batch reactor
