S/N对硫化物型自养反硝化性能及NO-2-N积累的影响  

Effect of S/N on sulfide autotrophic denitrification performance and nitrite accumulation

作　　者：付昆明[1] 赵静[1] 靳怡然 卞逸豪 FU Kun-ming;ZHAO Jing;JIN Yi-ran;BIAN Yi-hao(Sino-Dutch R&D Center for Future Wastewater Treatment Technologies,Key Laboratory of Urban Storm Water System and Water Environment,Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学雨水系统与水环境教育部重点实验室中-荷污水处理技术研发中心,北京100044

出　　处：《应用化工》2023年第5期1347-1352,共6页Applied Chemical Industry

基　　金：国家自然科学基金(52000007);北京建筑大学市属高校基本科研业务费专项(X20136)。

摘　　要：以Na 2S为硫源,采用批次实验探究不同初始S/N(摩尔比)对硫化物自养反硝化性能及NO_(2)^(-)-N积累的影响。结果表明,当S/N≤2.80时,NO_(3)^(-)-N及NO-X-N(NO_(2)^(-)-N+NO_(3)^(-)-N)去除效果随S/N的升高而显著提升,S/N由0.35升高到2.80时,前6 h内NO_(3)^(-)-N及NO-X-N去除率分别提高了3.7倍及3.6倍,当S/N继续增至4.20时,NO_(3)^(-)-N及NO-X-N去除效果较S/N为2.80时变化不大;当S/N≤0.70时系统内可以获得一定的NO_(2)^(-)-N积累,反应结束时NO_(2)^(-)-N积累率(0.35,0.7)分别可达47.9%及24.5%,当S/N≥1.40时难以稳定积累NO_(2)^(-)-N,NO_(2)^(-)-N最高积累率(1.40,2.80,4.20)分别为55.0%,33.3%,39.7%。S/N≤0.70时可获得一定的NO_(2)^(-)-N积累,而S/N在1.40~2.80范围内时,升高S/N可以提供更多电子用于反硝化,缓解各种反硝化酶对于电子的竞争,降低中间产物积累,提升脱氮效果。Batch experiments with Na 2S as the sulfur were used to investigate the effects of different S/N(molar ratios)on the denitrification performance of sulfide autotrophic denitrification and nitrite accumulation.The results showed that the removal effect of NO_(3)^(-)-N and NO-X-N increased significantly with the increase of S/N when it≥2.80,the removal rate of NO_(3)^(-)-N and NO-X-N increased by 3.7 times and 3.6 times in the first 6 h respectively when S/N increased from 0.35 to 2.80,but the removal effect of NO_(3)^(-)-N and NO-X-N changed little when it increased from 2.80 to 4.20.Stable NO_(2)^(-)-N accumulation can be obtained in the system when S/N≤0.70,and the NO_(2)^(-)-N accumulation rate(0.35,0.70)can reach 47.9%and 24.5%at the end of the reaction.However,it is difficult to stably accumulate NO_(2)^(-)-N when S/N≥1.40,and the highest accumulation rate(1.40,2.80,4.20)of NO_(2)^(-)-N was 55.0%,33.3%and 39.7%.Stable NO_(2)^(-)-N accumulation can be obtained when S/N≤0.70,while increasing S/N will provide more electrons for denitrification,alleviate the competition of various denitrifying enzymes for electrons,reduce the accumulation of intermediates,and improve the effect of denitrification when it is in the range of 1.40~2.80.

关 键 词：硫化物 自养反硝化 S/N 脱氮性能 NO-2-N积累 

分 类 号：TQ031.9[化学工程] X703[环境科学与工程—环境工程]