WANG Xiao-ting,LI Xiao-ling,LU Zhao-lin,et al.Effect of S/N Ratio on Dissimilatory Nitrite Reduction Process in Activated Sludge System[J].China Water & Wastewater,2021,37(23):95-100.
活性污泥系统中S/N对硝酸盐异化还原过程的影响
- Title:
- Effect of S/N Ratio on Dissimilatory Nitrite Reduction Process in Activated Sludge System
- Keywords:
- sulfur autotrophic denitrification; S/N ratio; dissimilatory nitrite reduction to ammonia(DNRA); oxidation-reduction potential (ORP); microbial community analysis
- 摘要:
- 硝酸盐异化还原成铵（DNRA）作为硝酸盐异化还原途径的重要过程而备受关注，为研究活性污泥系统中硫对硝酸盐异化还原过程（反硝化和DNRA过程）的影响，以硫化钠为电子供体、硝酸盐为电子受体，在活性污泥系统中分析控制不同S/N的效果。当S/N=1.0时，系统主要进行硫自养反硝化；当S/N分别为1.3、1.5、1.7、2.0时，系统同时发生硫自养反硝化和DNRA过程，且DNRA所占的百分比（PDNRA）在S/N=1.7时最大，说明活性污泥硫自养反硝化体系中电子供体充足时会出现DNRA过程，且PDNRA随电子供体/受体的比例不同而发生改变。系统中的氧化还原电位（ORP）对硝酸盐还原过程有一定的指示作用，ORP值越低越有利于DNRA的发生。微生物测定结果表明，Thiobacills、Hydrogenophilaceae、Pseudoxanthomonas和Burkholderiaceae是与硫自养反硝化和DNRA过程相关的主要菌群，进一步确定了DNRA过程的发生。
- Abstract:
- Dissimilatory nitrite reduction to ammonia (DNRA), an important component of nitrate dissimilatory reduction pathway, has attracted much attention. To explore the effect of sulfur on denitrification and DNRA process in activated sludge system, effect of different S/N ratio on nitrate dissimilation reduction pathway in activated sludge system was analyzed by using sodium sulfide as electron donor and nitrate as electron acceptor. When S/N ratio was 1.0, sulfur autotrophic denitrification process was dominated in the system. When S/N ratios were 1.3, 1.5, 1.7 and 2.0, respectively, both sulfur autotrophic denitrification and DNRA processes occurred simultaneously in the system, and the proportion of DNRA (PDNRA) reached the maximum when S/N ratio was 1.7. The results indicated that DNRA occurred when the electron donor was sufficient in the activated sludge sulfur autotrophic denitrification system, and the PDNRA changed with the ratio of electron donor to acceptor. Oxidation-reduction potential (ORP) of the system could indicate the nitrate reduction process to some extent, and lower ORP was more beneficial to DNRA occurrence. Thiobacills,Hydrogenophilaceae,Pseudoxanthomonas and Burkholderiaceae were main microbial community of the process of sulfur autotrophic denitrification and DNRA, further confirming the occurrence of DNRA process.
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