Yu De-Shuang, Wu Guo-Dong, Li Jin, Zhou Tong, Wang Xiao-Jing
School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.
Huan Jing Ke Xue. 2018 Apr 8;39(4):1688-1696. doi: 10.13227/j.hjkx.201706023.
High salt content could result in the inhibition of microbes and affect biological treatment processes. At present, an important research topic is how to improve the efficiency of biological treatments. The anaerobic ammonia oxidation (ANAMMOX) process was used to treat high saline wastewater. Nitrogen removal performance with betaine was studied by analyzing the ANAMMOX activity, and ammonia nitrogen and nitrate nitrogen removal. The results showed that:① It has obvious improvement when betaine concentration was 0.1-0.4 mmol·L. It alleviated the salt stress on bacteria growth inhibition of ANAMMOX, and also promoted the growth of denitrifying bacteria. When betaine concentration was 0.4-0.5 mmol·L, denitrifying bacteria was found to have grown greatly. When betaine concentration was greater than 0.5 mmol·L, it was unable to alleviate the salt stress inhibiting denitrification efficiency. As a result, betaine concentration of 0.8 mmol·L completely inhibited bacteria. ② When concentration of betaine was 0.3 mmol·L, the optimal nitrogen removal efficiency was achieved. NH-N and NO-N increased by 16% and 32%, respectively. Nitrogen removal rate (NRR) increased by 26.8%. ③ At the end of the recovery experiment, with the decreasing concentrations of betaine, NH-N was 50.6%, NO-N was 63.7%, and NRR was 0.65 kg·(m·d), so the nitrogen removal efficiency underwent fast recovery.
高盐含量会导致微生物受到抑制并影响生物处理过程。目前，一个重要的研究课题是如何提高生物处理的效率。采用厌氧氨氧化（ANAMMOX）工艺处理高盐废水。通过分析厌氧氨氧化活性、氨氮和硝酸盐氮的去除情况，研究了甜菜碱对脱氮性能的影响。结果表明：①当甜菜碱浓度为0.1 - 0.4 mmol·L时，有明显改善。它减轻了盐胁迫对厌氧氨氧化细菌生长的抑制作用，还促进了反硝化细菌的生长。当甜菜碱浓度为0.4 - 0.5 mmol·L时，发现反硝化细菌大量生长。当甜菜碱浓度大于0.5 mmol·L时，无法缓解抑制反硝化效率的盐胁迫。结果，0.8 mmol·L的甜菜碱浓度完全抑制了细菌生长。②当甜菜碱浓度为0.3 mmol·L时，实现了最佳脱氮效率。NH-N和NO-N分别提高了16%和32%。脱氮率（NRR）提高了26.8%。③在恢复实验结束时，随着甜菜碱浓度降低，NH-N为50.6%，NO-N为63.7%，NRR为0.65 kg·(m·d)，因此脱氮效率迅速恢复。
