Fu Kun-Ming, Wang Hui-Fang, Su Xue-Ying, Zhou Hou-Tian
Key Laboratory of Urban Storm Water System and Water Environment, Ministry of Education, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Huan Jing Ke Xue. 2016 Nov 8;37(11):4261-4267. doi: 10.13227/j.hjkx.201604221.
A completely autotrophic nitrogen removal over nitrite (CANON) reactor with haydite as carrier was operated in a sequencing batch biofilm reactor. The effect of different initial pH on nitrogen removal performance and NO emission was investigated using synthetic inorganic ammonia-rich wastewater as influent at 30℃±1℃. During the experiment, the pH of influent was controlled at 6.64, 6.98, 7.15, 7.88 and 7.95 under the same influent ammonia concentration condition, with hydraulic retention time of 5 hours and aeration rate of 6 m·(m·h). The results showed that, when the initial pH was between 6.64 and 7.95, the performance of autotrophic nitrogen removal over nitrite was basically stable. The total nitrogen removal efficiencies were 81.38%, 87.32%, 92.12%, 88.21% and 86.84%, respectively. And the total nitrogen removal loads were all higher than 1.56 kg·(m·d). Initial NO emission rates were basically equal and decreased after rising to a peak value. Besides, the lower the initial pH was, the higher the maximum NO emission rate was. In addition, NO emissions and ratios decreased with rising initial pH. Initial pH between 6.64 and 7.95 had little influence on nitrogen removal but NO emissions. Initial pH should be kept at about 7.90 to achieve high efficient nitrogen removal and reduction of NO emission synchronously.
以陶粒为载体的完全自养亚硝酸盐氮去除（CANON）反应器在序批式生物膜反应器中运行。在30℃±1℃下，以合成无机富氨废水为进水，研究了不同初始pH对脱氮性能和NO排放的影响。实验期间，在进水氨浓度相同的条件下，将进水pH控制在6.64、6.98、7.15、7.88和7.95，水力停留时间为5小时，曝气速率为6 m·（m·h）。结果表明，当初始pH在6.64至7.95之间时，亚硝酸盐自养脱氮性能基本稳定。总氮去除效率分别为81.38%、87.32%、92.12%、88.21%和86.84%。并且总氮去除负荷均高于1.56 kg·（m·d）。初始NO排放速率基本相等，上升至峰值后下降。此外，初始pH越低，最大NO排放速率越高。另外，NO排放和比率随初始pH升高而降低。初始pH在6.64至7.95之间对脱氮影响较小，但对NO排放有影响。应将初始pH保持在约7.90，以实现高效脱氮并同时减少NO排放。
