集成模块系统同步硝化反硝化处理低碳氮比污水的试验

Performance characteristics of simultaneous nitrification and denitrification(SND) for low carbon to nitrogen (C/N) ratio wastewater in an integrated device

以模拟低 C/N 比污水为研究对象,采用集成模块式污水处理装置与技术,在反应器主反应区实现了同步硝化反硝化（SND）,研究了在不同 DO、HRT、C/N 比、pH 值下污水氨氮、总氮的去除,研究结果表明,DO=1.2～1.4mg/L,总 HRT=20h（主反应区 HRT=8h）,原水C/N=5：1,pH=7.5时,NH3--N可以从15mg/L降至2.5mg/L,总氮可以从20mg/L降至4mg/L,去除率可以达到83%和80%；主反应区SND动力学模型求解得出集成模块式污水处理 SND 动力学方程及反硝化过程中硝酸盐氮饱和常数K 3NO N-=1.55mg/L,远高于普通活性污泥反硝化-过程中的饱和常数0.06～0.2mg/L.集成模块式污水处理技术能高效去除低C/N比污水中的总氮,且具有运行稳定和抗冲击等优点.为中小城镇生活污水深度脱氮提供了技术支持和理论基础.

Ammonia and total nitrogen （TN） removal efficiencies of SND in an integrated device and its influence factors, such as DO concentration, HRT, C/N ratio, influent pH, etc., were studied and analyzed. Dynamic model of SND in the system was established and solved. The results showed that total nitrogen was decreased to 4mg/L from 20mg/L （80%）, ammonia to 2.5mg/L from 15mg/L （83%） by the SND in the integrated device at conditions of DO 1.2～1.4mg/L, HRT 20h （8h in the first reaction zone）, C/N ratio 5：1, influent pH 7.5. K 3NO N-1.55, which was well above that of traditional active-sludge process （0.2～0.5mg/L）, was obtained by solving dynamic model of SND in the system. The results indicated that nitrogen in low C/N ratio wastewater could be efficiently removed by this technology. The integrated wastewater treatment technology was of operation stability and the ability to resist shock loading, and could be a basis for advanced nitrogen removal of low C/N ratio small discharge from small town.