Aerobic granular sludge formation and nutrients removal characteristics under low temperature
LIANG Dong-bo1, BIAN Wei2, WANG Wen-xiao3, ZHAO Qing4, SUN Yi-qi1, WU Yao-dong1, HOU Lian-gang1, LI Jun1
1. National Engineering Laboratory of Urban Sewage Advanced Treatment and Resource Utilization Technology, College of Architecture and Civil Engineering of Beijing University of Technology, Beijing 100124, China;
2. National Energy Investment Group Co., Ltd., Beijing, 100011, China;
3. Beijing Enterprises Water Group Ltd., Beijing 100024, China;
4. North China Municipal Engineering Design & Research Institute Co., Ltd., Tianjin 300202
In order to study the formation of aerobic granular sludge and nutrients removal characteristics under low temperature, a sequencing batch reactor (SBR) has been operated at 15℃. The results showed that the mature AGS which have good performance of partial nitrification were obtained within 60days and nitrite accumulation rate (NAR) can achieve above 90% in stable operation stages. The picture of scanning electron microscopy (SEM) showed that AGS mainly consisted of short bacillus and cocci. The nutrients removal performance of AGS in different particlesizes R1(1.0~2.0mm), R2(2.0~3.0mm), and R3(above 3.0mm) were investigated by gas collector batch tests under 15℃.The nutrients removal performanceof R2 and R3 were better than R1 and their NAR were above 90%. The increase of particle size would affect mass transfer of substrate and then provide appropriate places for ammonium oxidizing bacteria (AOB), nitrite oxidizing bacteria (NOB) and denitrifying bacteria which are good for nitrification. The depth of DO in AGS was 600~700μm when the DO in the bulk water was 6~7mg/L at 15℃ through the determination of microelectrode.
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