XUELei,ZENGLing-cong,LIZheng-hao,et al.Nitrogen Removal Performance through Synergistic Operation of Aerobic Granular Sludge and Anaerobic Ammonium Oxidation Granular Sludge[J].China Water & Wastewater,2025,41(23):132-140.
好氧颗粒污泥-厌氧氨氧化颗粒污泥工艺脱氮性能
- Title:
- Nitrogen Removal Performance through Synergistic Operation of Aerobic Granular Sludge and Anaerobic Ammonium Oxidation Granular Sludge
- Keywords:
- aerobic granular sludge; anaerobic ammonium oxidation granular sludge; continuous flow reactor; expanded granular sludge blanket; sequencing batch reactor; autotrophic nitrogen removal
- 摘要:
- 构建了好氧颗粒污泥（AGS）-厌氧氨氧化颗粒污泥（AnGS）耦合工艺，旨在为赣南离子型稀土矿山尾水自养脱氮提供技术支持。运行过程中，连续流反应器（CFR）中的AGS以及膨胀颗粒污泥床（EGSB）和序批式反应器（SBR）中的AnGS形状均变化不大，始终维持着95%以上的颗粒化率。通过限氧曝气，辅之进水氨氮及碱度调控，第35天后CFR出水氨氮与亚硝态氮比值逐渐稳定在1∶1.01~1∶1.36之间，亚硝酸盐积累率（NAR）基本保持在80.27%~98.59%之间，总无机氮（TIN）去除率逐渐稳定在25%~35%左右。游离氨（FA）对亚硝酸盐氧化菌（NOB）的选择性抑制是实现稳定半量短程硝化的关键。EGSB的脱氮效果很不稳定，第64天后对TIN的去除率降至10%以下，导致CFR-EGSB耦合工艺对TIN的去除率亦波动较大（24.84%~78.83%），CFR及EGSB对TIN去除的贡献率分别为28.35%~96.79%和3.32%~71.65%。第61~80天游离亚硝酸（FNA）的增加可能是EGSB脱氮性能下降的主要原因。第81~90天SBR对TIN的去除率呈上升趋势，自第91天开始基本维持在60%~70%之间。CFR-SBR耦合工艺对TIN的去除率逐渐增大至80.36%，SBR对TIN去除的贡献率逐渐增大至60%左右。
- Abstract:
- A coupled system integrating aerobic granular sludge (AGS) and anaerobic ammonium oxidation granular sludge (AnGS) was developed to provide technical support for autotrophic denitrification of wastewater from ionic rare earth mines in Southern Jiangxi Province. During operation, the morphologies of AGS in the continuous flow reactor (CFR), as well as those of AnGS in the expanded granular sludge blanket (EGSB) and sequencing batch reactor (SBR), remained largely stable, with granulation rates consistently exceeding 95% throughout the experimental period. Through oxygen- limited aeration, combined with the regulation of influent ammonia nitrogen and alkalinity, the ratio of ammonia nitrogen to nitrite nitrogen in the CFR effluent gradually stabilized between 1∶1.01 and 1∶1.36 after day 35. The nitrite accumulation rate (NAR) consistently remained within the range of 80.27% to 98.59%, while the total inorganic nitrogen (TIN) removal efficiency gradually stabilized at approximately 25% to 35%. The selective inhibition of nitrite-oxidizing bacteria (NOB) by free ammonia (FA) was crucial for achieving stable partial nitrification. The nitrogen removal performance of the EGSB reactor was highly unstable. After the 64th day, the TIN removal efficiency declined below 10%, leading to significant fluctuations in the overall TIN removal efficiency within the CFR-EGSB system, ranging from 24.84% to 78.83%. The contribution rates of the CFR and EGSB to TIN removal varied between 28.35% and 96.79%, and 3.32% and 71.65%, respectively. The rise in free nitrous acid (FNA) between day 61 and day 80 might be the primary factor contributing to the deterioration of nitrogen removal performance in the EGSB. The TIN removal efficiency of the SBR exhibited a consistent upward trend from day 81 to day 90 and remained relatively stable between 60% and 70% thereafter. In contrast, the TIN removal efficiency of the CFR-SBR coupled process gradually increased, reaching a maximum of 80.36%. Concurrently, the contribution rate of SBR unit to TIN removal rose progressively to about 60%.
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