School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Technical Center of Sewage Treatment Industry in Gansu, Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou, 730070, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Dec;28(46):65462-65473. doi: 10.1007/s11356-021-15531-9. Epub 2021 Jul 28.
Real domestic wastewater was treated initially in a sequencing batch reactor (SBR), with partial nitrification achieved before the effluent was used as the influent for an anaerobic ammonium oxidation (anammox) reactor (ASBR) system. The effects of three factors, hydraulic retention time (HRT), substrate (NO/NH) ratio, and the ratio of COD to NH (C/N), on the removal of carbon and nitrogen by an anammox and denitrification process were investigated in the ASBR reactor at 24°C. The response surface methodology was used to explore the interactions of the three factors. The results indicated that the nitrogen and carbon removal efficiency was optimum when HRT, substrate ratio, and C/N ratio were 33 h, 1.4-1.6, and 3-5, respectively. The optimal removal rates of NH, NO, and COD were 96.30%, 97.79%, and 72.91%, respectively. The ΔNO/ΔNH and ΔNO/ΔNH ratios of the first two conditions were less than the theoretical anammox values of 1.32 and 0.26 due to heterotrophic denitrification. The optimum nitrogen and carbon removal efficiencies of the third condition could be realized by the synergistic effect of denitrification and the anammox process. Analysis of variance (ANOVA) results showed that when the HRT was 33.48 h, the substrate ratio was 1.46, and the C/N ratio was 4.28, the total nitrogen removal rate (TNR) was optimum (90.12 ± 0.1%), verified by parallel experiments.
实际生活污水先在序批式反应器（SBR）中进行处理，在出水作为厌氧氨氧化（anammox）反应器（ASBR）系统的进水之前实现部分硝化。在 24°C 下，在 ASBR 反应器中研究了水力停留时间（HRT）、底物（NO/NH）比和 COD 与 NH 的比值（C/N）这三个因素对 anammox 和反硝化过程去除碳和氮的影响。采用响应面法来探索这三个因素的相互作用。结果表明，当 HRT、底物比和 C/N 比分别为 33 h、1.4-1.6 和 3-5 时，氮和碳的去除效率最佳。NH、NO 和 COD 的最佳去除率分别为 96.30%、97.79%和 72.91%。由于异养反硝化作用，前两种条件下的 ΔNO/ΔNH 和 ΔNO/ΔNH 比值均小于理论 anammox 值 1.32 和 0.26。第三种条件下的最佳氮和碳去除效率可以通过反硝化和 anammox 过程的协同作用来实现。方差分析（ANOVA）结果表明，当 HRT 为 33.48 h、底物比为 1.46、C/N 比为 4.28 时，总氮去除率（TNR）最佳（90.12±0.1%），平行实验验证了这一结果。
