Effect of iron scraps on anammox systems at low temperature
LI Tian-hao1, XU Yun-xiang1, GUQ Zhi-han1, HUANG Zi-chuan1, LIU Wen-ru1,2, SHEN Yao-liang1,2
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; 2. Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou 215009, China
Abstract：The effects of iron scraps addition and its dosing methods on the nitrogen removal performance and microbial community of anaerobic ammonia oxidation(anammox)reactors were investigated at low temperature (<20℃). The results showed that when the dosage of iron scraps was 10g/L, both the direct (R2) and indirect (R3) dosing methods caused short-term inhibition of anammox bacteria. Consequently, the total nitrogen removal effieiency reduced by 4.7% and 3.4%, respectively. The total nitrogen removal effieiency of the control group (R1), R2 and R3 all reached to about 70% after 30 days of continuous operation. During the stable operation,Rs(the ratio of NO2--N removal to NH4+-N removal) and Rp(the ratio of NO3--N generation to NH4+-N removal) of R2 were 1.57 and 0.22, Rs and Rp of R3 were 1.49 and 0.23, which were closer to the theoretical value of anammox than R2. The decrease of DO concentration and the increase of pH was observed likely due to the corrosion of iron scraps in the water. The iron concentration of sludge in R2 and R3 was 1.64 times and 1.93 times higher than that of in control reactor. These results suggested that the iron scraps addition not only improved the living habitats, but also supplyed iron for anammox bacteria. High-throughput sequencing results showed that during the 20~50days operation, the relative abundance of the dominant anammox bacteria Candidatus_Kuenenia in R1, R2, and R3 increased by -1.05%, 0.14%, and 0.96%, respectively. This indicated that the addition of iron scraps promoted the growth of anammox bacteria at low temperature, while the enhancment was more obvious with the indirect addition of iron scraps.
李天皓, 徐云翔, 郭之晗, 黄子川, 刘文如, 沈耀良. 低温下废铁屑对厌氧氨氧化系统的影响[J]. 中国环境科学, 2022, 42(4): 1688-1695.
LI Tian-hao, XU Yun-xiang, GUQ Zhi-han, HUANG Zi-chuan, LIU Wen-ru, SHEN Yao-liang. Effect of iron scraps on anammox systems at low temperature. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1688-1695.
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