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碳氮比对生物反硝化中N_2O产量的影响

Keywords: N2O,碳氮比,全程反硝化,短程反硝化

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Abstract:

利用间歇式反应器(sequencingbatchreactor,SBR),以乙醇作为外加碳源,考察不同化学需氧量(chemicaloxygendemand,COD)与氮的质量浓度的比值对全程和短程反硝化脱氮过程中N2O产量的影响.全程反硝化过程中,调节ρ(COD)/ρ(N)为1.56、2.83、4.56、6.01和10.0,短程反硝化中调节ρ(COD)/ρ(N)为1.51、2.45、3.33、4.13和9.7.结果表明,全程和短程反硝化的最佳ρ(COD)/ρ(N)分别为6.01和4.13,硝酸盐和亚硝酸盐完全被还原,反硝化过程中几乎没有N2O产生,1g混合液悬浮固体(mixedliquorsuspendedsolids,MLSS)每天还原的硝态氮和亚硝态氮分别可达0.077和0.089g.在碳源充足的条件下,反硝化速率不再随着有机物的增加而增加.在低ρ(COD)/ρ(N)时,短程反硝化过程中N2O产量远大于全程反硝化过程,最高可达0.607mg/L.在碳源不足时,亚硝酸盐对氧化亚氮还原酶(N2Oreductase,N2OR)的抑制作用和ρ(COD)/ρ(N)不足是影响系统N2O产量增加的主要原因.

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