| 引用本文: | 李冬,刘名扬,张杰,任纪元.水力筛分间歇饥饿CANON工艺参数调控及稳定运行[J].哈尔滨工业大学学报,2022,54(2):1.DOI:10.11918/202102040 |
| LI Dong,LIU Mingyang,ZHANG Jie,REN Jiyuan.Optimization and stable operation of CANON process of intermittent starvation based on hydraulic screening[J].Journal of Harbin Institute of Technology,2022,54(2):1.DOI:10.11918/202102040 |
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| 水力筛分间歇饥饿CANON工艺参数调控及稳定运行 |
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李冬1,刘名扬1,张杰1,2,任纪元1
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(1.水质科学与水环境恢复工程北京市重点实验室(北京工业大学),北京 100124;2.城市水资源与水环境国家重点实验室(哈尔滨工业大学),哈尔滨 150090)
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| 摘要: |
| 为探究水力筛分间歇饥饿策略运行CANON工艺的稳定性及相关参数的设置,采用SBR反应器运行CANON工艺,定期通过水力筛分排出絮状污泥,之后对其进行间歇饥饿,以此抑制NOB的生长繁殖,探讨沉降时间和饥饿周期两项参数的调控,实现CANON工艺处理低氨氮污水的稳定运行。结果显示,不同的沉降时间对于粒径分布和功能菌活性有较大影响,1.5 min以上的沉降时间可将ANAMMOX菌基本留存在反应器中,AOB在颗粒污泥和絮状污泥中均有分布,NOB则主要分布于传质阻力小的絮状污泥中。AOB在缺氧饥饿期间的活性衰减速率基本保持稳定,而NOB在面对缺氧饥饿时表现得更为敏感,活性衰减速率大于AOB。在恢复阶段,由于AOB具有一种独特的机制来应对饥饿,能够将细胞保持在经历短时饥饿后立即以最大速率开始氧化NH+4-N的状态,使其在恢复3 d时的底物降解速率就达到0.097 g/(g·d),恢复至饥饿前的86%,而NOB因无法快速适应环境的变化活性恢复速率滞后于AOB。采用4 d饥饿和3 d恢复的模式运行反应器,NOB得到有效抑制,出水NO-3-N呈现下降趋势,之后调整间歇饥饿周期为4 d饥饿和5 d恢复,更好地提升了AOB的活性,处理效果进一步提升,进入稳定阶段,出水NH+4-N和NO-3-N平均值分别为2.69和7.79 mg/L,氨氮去除率和总氮去除率分别达到96%和79%。采用水力筛分间歇饥饿CANON工艺处理低氨氮污水运行性能稳定,出水满足GB 18918—2002《城镇污水处理厂污染物排放标准》中所规定的一级A标准。 |
| 关键词: 全程自养脱氮 水力筛分 间歇饥饿 好氧氨氧化菌 亚硝酸盐氧化菌 |
| DOI：10.11918/202102040 |
| 分类号:X703 |
| 文献标识码:A |
| 基金项目:北京高校卓越青年科学家计划项目(BJJWZYJH01201910005019) |
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| Optimization and stable operation of CANON process of intermittent starvation based on hydraulic screening |
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LI Dong1,LIU Mingyang1,ZHANG Jie1,2,REN Jiyuan1
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(1.Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering (Beijing University of Technology), Beijing 100124, China; 2.State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology), Harbin 150090, China)
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| Abstract: |
| In order to explore the stability of the completely autotrophic nitrogen removal over nitrite (CANON) process and the setting of related parameters in the intermittent starvation based on hydraulic screening, sequencing batch reactor (SBR) was used for the CANON process. Flocculent sludge was periodically discharged through hydraulic screening, and intermittent starvation was performed on it to inhibit the growth and reproduction of nitrite-oxidizing bacteria (NOB). The adjustment of two parameters (sedimentation time and starvation period) was investigated to realize the stable operation of CANON process. Experimental results show that sedimentation time had great impact on the particle size distribution and functional bacteria activity. A sedimentation time of more than 1.5 min could basically retain the ANAMMOX bacteria in the reactor. Ammonia-oxidizing bacteria (AOB) were distributed in flocculent sludge and granular sludge, and NOB was mainly distributed in the flocculent sludge with low mass transfer resistance. The activity decay rate of AOB during hypoxic starvation remained basically stable, while NOB was more sensitive in the face of hypoxic starvation, and the activity decay rate of NOB was greater than that of AOB. In the recovery phase, since AOB has a unique mechanism to deal with starvation that it can keep the cells in a state of oxidizing NH+4-N at the maximum rate immediately after experiencing a short-term starvation, it could reach the substrate degradation rate of 0.097 g/(g·d) when the inlet water has been fed for 3 d, which was 86% of the pre-starvation rate. However, NOB could not quickly adapt to the changes in the environment, causing its activity recovery rate to lag behind AOB. When the reactor was operated in the mode of 4 d starvation and 3 d recovery, NOB was effectively suppressed that the NO-3-N in the effluent showed a downward trend. Afterwards, the intermittent starvation period was adjusted to 4 d starvation and 5 d recovery, which improved the activity of AOB and the treatment effect was further enhanced. Entering the stable stage, the average values of effluent NH+4-N and NO-3-N were 2.69 and 7.79 mg/L respectively, and the removal rates of ammonia nitrogen and total nitrogen reached 96% and 79% respectively. The use of hydraulic screening and intermittent starvation CANON process to treat low-ammonia nitrogen wastewater has stable operation performance, and the effluent meets the first-level A standard specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918—2002). |
| Key words: completely autotrophic nitrogen removal over nitrite (CANON) hydraulic screening intermittent starvation ammonia-oxidizing bacteria (AOB) nitrite-oxidizing bacteria (NOB) |
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