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NaCl盐度对SBR工艺短程硝化反硝化的影响

Keywords: 短程硝化反硝化,序批式活性污泥法,冲击负荷,亚硝态氮

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Abstract:

利用序批式活性污泥反应器(sequencingbatchreactor,SBR)研究了NaCl盐度、水力停留时间(hydraulicretentiontime,HRT)和进水负荷对短程硝化反硝化的影响.结果表明,在pH、温度和溶解氧(dissolvedoxygen,DO)质量浓度分别为7.5~8.5、30~35℃和0.5~1mg/L的条件下,当NaCl盐度、进水化学需氧量(chemicaloxygendemand,COD)和氨氮质量浓度分别为5.8~25.0g/L、450~550mg/L和35~45mg/L时,NO2--N累积率大于50%.在NaCl盐度14.5g/L的条件下,当HRT为6.21h,进水中每天1kg悬浮物中所含的CDD和氨氮量分别为5.03×10-2和2.24×10-3kg时,亚硝酸盐累积率高于99%.高盐环境下控制HRT、有机负荷与氨氮负荷可实现短程硝化反硝化,实现短程硝化的耐盐极限为25g/L.

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