The effects of signal molecules on the characteristics of ANAMMOX granules in high-loaded UASB reactors
ZHANG Jing1, ZHANG Lin-hua1, JIANG Dong-dong2, LI Jun1, LI Yun1, ZHANG Yan-zhuo1
1. The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;
2. Guangdong Shaogang Engineering Technology Co Ltd, Shaoguan 512123, China
A typical setback of ANAMMOX granules was their flotation when the reactor was run at high loading rates. The effects of Acylated Homoserine Lactones (AHLs) on the characteristics of ANAMMOX granules in high-loaded UASB reactors were investigated. The results showed that the exogenous addition of 30mg/LN-octanoyl-PL-homoserine lactone (C8-HSL) had long-term effects on the settleability of ANAMMOX granules and was able to control the sludge floating effectively. At the beginning of the experiment (0~20d), C8-HSL was added to the reactor R2. While compared with the control group R1, the content of B-EPS in the granular sludge in R2was decreased by 15% and the granular sludge's value of PN/PS dropped from 4.22 to 2.14 on the 100th day. In addition, the hydrophobicity of the granular sludge in R2 was increased by 26% on the 100th day. Therefore, the settleability of sludge granules in R2 was improved significantly (the density of the granules was increased by 24%, and the settling velocity of the granules was increased by 90%). During the 100days, no obvious granule floatation was observed in R2. On the 100th day, the NLR was 12.9kg-TN/(m3·d) and the NRR was up to 11.3kg-TN/(m3·d) in R2. At the same time, the nitrogen removal efficiency was up to 88% in R2. C6-HSL improved the activity of the granular sludge, while C12-HSL had no effects on the characteristics of the granules in the high-loaded reactors.
张晶, 张林华, 姜冬冬, 李军, 李芸, 张彦灼. 信号分子对高负荷UASB中ANAMMOX颗粒特性的影响[J]. 中国环境科学, 2018, 38(2): 532-541.
ZHANG Jing, ZHANG Lin-hua, JIANG Dong-dong, LI Jun, LI Yun, ZHANG Yan-zhuo. The effects of signal molecules on the characteristics of ANAMMOX granules in high-loaded UASB reactors. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(2): 532-541.
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