Biological Processes Laboratory, São Carlos School of Engineering (EESC), University of São Paulo (USP), São Carlos, Brazil.
Bioprocess Biosyst Eng. 2018 Aug;41(8):1115-1120. doi: 10.1007/s00449-018-1940-1. Epub 2018 Apr 20.
This study assessed the simultaneous nitrification and denitrification processes and remaining organic matter removal from anaerobic reactor effluent treating wastewater in a single reactor. A structured-bed reactor, with polyurethane foam as support media, was subjected to intermittent aeration and effluent recirculation. Aerated/non-aerated periods varied in the range of 2/1-1/3 h. The chemical oxygen demand (COD) in the effluent remained between 26 and 42 mg L throughout all the aeration conditions. Aeration periods of 1/2 h removed 80 and 26% of Total Kjeldahl Nitrogen and Total Nitrogen, respectively. A low solid production was observed during the 300 days of operation, resulting in a solid retention time of 139 days. The results indicate that the non-aerated periods generated alkalinity that favored nitrification, maintaining low COD concentrations in the effluent. The structured bed reactor presented a low solid production and effluent loss below 20 mgSSV L, similar to concentrations obtained in secondary decanters.
本研究评估了在单个反应器中从厌氧反应器流出物中处理废水的同时硝化反硝化过程和剩余有机物去除。采用具有聚氨酯泡沫作为支撑介质的结构化床反应器，进行间歇曝气和回流。曝气/非曝气时间在 2/1-1/3 h 范围内变化。在所有曝气条件下，废水中的化学需氧量（COD）保持在 26 至 42 mg L 之间。曝气时间为 1/2 h 时，总凯氏氮和总氮的去除率分别为 80%和 26%。在 300 天的运行期间，观察到固体产量低，导致固体停留时间为 139 天。结果表明，非曝气期产生的碱度有利于硝化作用，使出水的 COD 浓度保持在较低水平。结构化床反应器的固体产量低，出水损失低于 20 mgSSV L，类似于二级澄清池的浓度。
