太原理工大学学报

2019, v.50;No.225(05) 572-578

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微氧条件下FA、FNA和pH对半短程硝化的影响
Effect of FA, FNA and pH on Partial-nitrification Under Micro-aerobic Conditions

刘禹晟;朱薇;端允;
LIU Yusheng;ZHU Wei;DUAN Yun;College of Environmental Science and Engineering, Taiyuan University of Technology;

摘要(Abstract):

采用微孔曝气与机械搅拌相结合的序批式反应器(SBR),研究了微氧条件(0.3~0.5 mg/L溶解氧)下游离氨(FA)、游离亚硝酸(FNA)的质量浓度和pH对半短程硝化过程的影响。试验结果表明:在温度为(28±2)℃,进水pH值为7.8~8.3,FA的质量浓度为16~120 mg/L时均可实现稳定的半短程硝化,其中,FA的质量浓度为40 mg/L时亚硝酸盐积累率(NAR)最大,为95%.反应过程中发现,随着反应进行,FA浓度下降,FNA浓度上升,有利于抑制亚硝酸盐氧化细菌(NOB)生长,使实验过程中无需额外持续投加NaHCO_3维持恒定pH,可节约NaHCO_3约40%.反应运行94 d,氨氧化速率由40 mg/(L·h)上升到115 mg/(L·h).高通量测序发现,亚硝化单胞菌占比由32%增至39%;当FA的质量浓度高于40 mg/L时会明显降低氨氧化细菌(AOB)的增长速率,导致Nitrospira数量增多。
The sequencing batch reactor(SBR) combined with microporous aeration and mechanical agitation was used to study the effect of free ammonia(FA), free nitrous acid(FNA) and pH on partial-nitrification under micro-oxygen conditions(dissolved oxygen at 0.3~0.5 mg/L). The results show that stable partial-nitrification occurred at temperature of(28±2) ℃, pH of 7.8~8.3, with influent FA concentration from 16 to 120 mg/L. The nitrite accumulation rate(NAR) reached the maximum at FA concentration of 40 mg/L, which was 95%. During the reaction, as FA concentration decreased, FNA concentration increased accordingly, which benifited inhibiting the growth of nitrite oxidizing bacteria(NOB). No additional NaHCO_3 was required to maintain constant pH, thus NaHCO_3 was saved by about 40%. After 94 days of operation, the ammoxidation rate in the reactor increased from 40 to 115 mg/(L·h). By high-throughput sequencing technology the proportion of nitrosomonas was found to increase from 32% to 39%. When FA was higher than 40 mg/L, the growth rate of ammonia-oxidizing bacteria(AOB) was significantly reduced, resulting in an increase in the number of Nitrospira.

关键词(KeyWords): 半短程硝化;游离氨;游离亚硝酸;pH
partial-nitrification;free ammonia;free nitrous acid;pH

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基金项目(Foundation): 山西省重点研发计划(201603D221028-1)

作者(Author): 刘禹晟;朱薇;端允;
LIU Yusheng;ZHU Wei;DUAN Yun;College of Environmental Science and Engineering, Taiyuan University of Technology;

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