循环活性污泥法处理生活污水的脱氮性能实验研究

本以城市生活污水为处理对象，通过在主反应器前设置缺氧选择器，同时改变运行周期和进水-曝气方式，研究CAST工艺的生物降解过程及脱氮机理，并考察该工艺去除有机碳和脱氮的性能。结果表明，CAST生物脱氮工艺中最佳周期为4h。其出水CODCr质量浓度为61.80mg／L，去除率为84．52％；出水TN质量浓度平均为25．17mg／L，去除率为54．56％。非限制性曝气没有太大优势。建议采用限制性曝气与非连续性进水方式，以节约能耗和提高脱氮效果。

RESEARCH ON EFFECT OF NITROGEN REMOVAL FROM DOMESTIC WASTEWATER BY CYCLIC ACTIVATED SLUDGE TECHNOLOGY

The present paper is engaged in the study of the process of biological degradation with the domestic wastewater by following its recycling change and its way of influent and aeration. The paper has also studied the removing capacity of the organic carbon and nitrogen. In treating domestic wastewater, the author has established an anoxia selector in the front of the main reactor. The experimental results with the trial use of the selector indicate that 4 h is the best cycle of CAST biological denitrifying process. In order to save energy, it is suggested to use the intermittent influent and the restricted-aeration. If the indexes of the effluent in the above mentioned conditions can be CODCr: 61. 80 mg/L, the removal efficiency: will reach 84. 52%. While TN is 25. 17 mg/L, the removal efficiency can only reach 54. 56%.