Wu Li-na, Peng Yong-zhen, Wang Shu-ying, Zhang Shu-jun
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
Huan Jing Ke Xue. 2008 Dec;29(12):3428-32.
A system consisting of a two-stage UASB and anoxic-oxic reactor was used to study the influence of FA on short-cut nitrification of the actual municipal landfill leachate with high ammonia concentration. In the UASB1, denitrification and methanogenesis took place simultaneously. The effluent COD of UASB1 was further removed in the UASB2. Then the denitrification of nitrite and nitrate in the returned sludge by using the residual COD and nitrification was finished in the A/O reactor. The experiment experienced three stages during 79 d. The stable short-cut nitrification was achieved in the first stage (40 d). The short-cut nitrification was damaged in the second stage (19 d), and the short-cut nitrification was recovered in the last stage (20 d). The results of 79 d showed that when the FA concentration was about 40-70 mg x L(-1), the stable short-cut nitrification could be achieved. For example, the nitrite accumulation was 97% in the system during the first stage, and the ammonia removal efficiency was 99%. But when the FA concentration was about 160 mg x L(-1), the nitrification would be inhibited. In the third stage, raw leachate was diluted by tap water in order to decrease the FA concentration. And then the short-cut nitrification was recovered soon. In a word, the FA concentration is an important factor to achieve the short-cut nitrification of the municipal landfill leachate.
采用由两级上流式厌氧污泥床（UASB）和缺氧-好氧反应器组成的系统，研究游离氨（FA）对实际高氨浓度城市垃圾渗滤液短程硝化的影响。在UASB1中，反硝化和产甲烷同时发生。UASB1的出水COD在UASB2中进一步去除。然后，利用剩余COD和硝化作用，在A/O反应器中完成回流污泥中亚硝酸盐和硝酸盐的反硝化。实验在79天内经历了三个阶段。第一阶段（40天）实现了稳定的短程硝化。第二阶段（19天）短程硝化受到破坏，最后阶段（20天）短程硝化得以恢复。79天的实验结果表明，当FA浓度约为40 - 70mg·L⁻¹时，可实现稳定的短程硝化。例如，第一阶段系统中亚硝酸盐积累率为97%，氨去除率为99%。但当FA浓度约为160mg·L⁻¹时，硝化作用会受到抑制。在第三阶段，用自来水稀释原渗滤液以降低FA浓度。随后短程硝化很快得以恢复。总之，FA浓度是实现城市垃圾渗滤液短程硝化的重要因素。
