Efficient organics utilization of low C/N ratio domestic sewage through partial nitritation SBR

doi:10.11949/j.issn.0438-1157.20160980

Abstract

Abstract:

In order to efficiently utilize carbon source of low C/N ratio domestic sewage, two methods (reducing organics input and increasing carbon source consumption through denitrification) were introduced through the partial nitritation SBR. In this study, five factors, i.e. influent volume, drainage ratio, aeration time, precipitation time and stirring time after aeration were investigated to assess the effect on the utilization efficiency of carbon source(the ratio between the quality of carbon source consumption through denitrification and the total organics input). The results showed that when the drainage ratio was decreased from 50% to 35%, the utilization efficiency improved from 15.1% to 24.8%; when the aeration time was increased from 2 h to 2.25 h, the utilization efficiency increased from 24.8% to 27.5% and when 1.5 h of stirring time after aeration was added, the utilization efficiency increased by 3.8%. Meanwhile, the nitrite accumulation rate of the effluent was 94.8% and the NO₂^--N/NH₄⁺-N was 1.7, indicating that the partial nitrification was stably maintained, and the effluent was more proper for simultaneous anammox and denitrification (SAD) process. All in all, the organics utilization efficiency was promoted gradually through the adjustment of the operational parameters above, by which the aeration energy for consuming organics was saved, and then the multiplication of aerobic heterotrophic bacteria was weakened which avoided striking the ammonia oxidizing bacteria (AOB) effectively, keeping the nitritation effect stable.

Key words: partial nitritation, low C/N ratio, domestic sewage, aeration, precipitation, drainage, organics utilization efficiency

摘要：

为实现低C/N比生活污水中碳源的充分利用，以部分短程硝化SBR为研究对象，通过减少进水输入碳源的量和增加反硝化利用碳源的量两方面来提高碳源利用率（反硝化利用碳源的量与总进水碳源的量的比值），分别考察了进水量、排水比、曝气时间、沉淀时间、曝气后搅拌时间对碳源利用率的影响。结果表明，排水比由50%变为35%，碳源利用率由15.1%提高到24.8%；曝气时间由2 h增加到2.25 h，碳源利用率由24.8%提高到27.5%；曝气后增加1.5 h的搅拌过程，碳源利用率又提高了3.8%，此时出水的亚硝态氮积累率（NAR）为94.8%，NO₂^--N/NH₄⁺-N为1.7，表明了系统稳定的短程硝化效果，且能为同步厌氧氨氧化-反硝化（SAD）工艺提供更适宜的进水。通过调节以上运行参数，部分短程硝化SBR对于低C/N比生活污水的碳源利用率得以提升，节省了后期曝气去除有机物的能耗，进而削弱好氧异养菌的生长，有效避免好氧异养菌过度增殖对氨氧化菌（AOB）的冲击，维持系统稳定的短程硝化效果。

关键词: 部分短程硝化, 低C/N比, 生活污水, 曝气, 沉淀, 排水, 碳源利用率

CLC Number:

X703.1

ZHAO Mengyue, WANG Bo, GUO Yuanyuan, PENG Yongzhen. Efficient organics utilization of low C/N ratio domestic sewage through partial nitritation SBR[J]. CIESC Journal, 2016, 67(11): 4825-4836.

赵梦月, 王博, 郭媛媛, 彭永臻. 部分短程硝化SBR实现低C/N比生活污水碳源的充分利用[J]. 化工学报, 2016, 67(11): 4825-4836.

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