低C/N生活污水短程硝化及其机理探究:溶解氧的影响
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摘要
生活污水低C/N特性导致传统全称硝化反硝化工艺脱氮效率低下,短程硝化-反硝化具有节约碳源,减少曝气量,脱氮效率高的特点。以实际生活污水为探究对象探究了溶解氧对低C/N生活污水短程硝化反硝化的影响。结果表明DO浓度为化学需氧量(COD)去除影响不显著,而高浓度DO有助于氨氮的去除。DO浓度为0.8~1.0 mg/L时,总氮去除效率最高为85%,该DO浓度下,NO_2~--N的最高浓度为6.8 mg/L,显著高于其他DO组别,NO_3~--N的最高浓度随DO含量升高而升高。
The low C/N characteristics of domestic sewage resulted in low nitrogen removal efficiency in the traditional nitrification and denitrification process. Shortcut nitrification and denitrification had the characteristics of saving carbon source,reducing aeration amount and high denitrification efficiency. In this study,the effect of dissolved oxygen on shortcut nitrification and denitrification of low C/N domestic sewage was investigated with real sewage as the object. The results showed that the concentration of DO had no significant effect on the removal of chemical oxygen demand( COD),while the high concentration of DO contributed to the removal of ammonia nitrogen. When the concentration of DO was 0. 8-1. 0 mg/L,the maximum nitrogen removal efficiency was 85%,and the highest concentration of NO_2~--N was 6. 8 mg/L,which was significantly higher than that of other DO groups. The highest concentration of NO_3~--N increased with the increase of DO content.
The low C/N characteristics of domestic sewage resulted in low nitrogen removal efficiency in the traditional nitrification and denitrification process. Shortcut nitrification and denitrification had the characteristics of saving carbon source,reducing aeration amount and high denitrification efficiency. In this study,the effect of dissolved oxygen on shortcut nitrification and denitrification of low C/N domestic sewage was investigated with real sewage as the object. The results showed that the concentration of DO had no significant effect on the removal of chemical oxygen demand( COD),while the high concentration of DO contributed to the removal of ammonia nitrogen. When the concentration of DO was 0. 8-1. 0 mg/L,the maximum nitrogen removal efficiency was 85%,and the highest concentration of NO_2~--N was 6. 8 mg/L,which was significantly higher than that of other DO groups. The highest concentration of NO_3~--N increased with the increase of DO content.
引文
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[2]张攀,李智勤,李领明,等.SBR法短程硝化反硝化处理生活垃圾机械脱除水[J].中国给水排水,2018(1):68-73.
[3]王盟,卞伟,侯爱月,等.两段式曝气工艺的短程硝化反硝化特性[J].化工学报,2016,67(4):1497-1504.
[4]Castro-Barros C M,Rodríguez-Caballero A,Volcke E I P,et al.Effect of nitrite on the N 2 O and NO production on the nitrification of low-strength ammonium wastewater[J].Chemical Engineering Journal,2016,287:269-276.
[5]雷经纶,杨帆.浅谈实现短程硝化反硝化的影响因素[J].环境研究与监测,2017(2):45-48.
[6]赵群英,李侃,杨学福.短程硝化反硝化过程中N_2O释放特性及微观机理[J].西安工业大学学报,2016,36(11):872-875.
[7]杨旭.CRI系统短程硝化反硝化脱氮调控方法研究[D].成都:西南交通大学,2016.
[8]彭永臻,赵骥,王晓霞,等.强化生物除磷耦合同步短程硝化反硝化实现低C/N比污水同步脱氮除磷的装置和方法:CN105923772A[P].2016.