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首页> 外文期刊>Journal of environmental science and health >Piggery waste treatment by using down-flow anaerobic fixed bed reactors
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Piggery waste treatment by using down-flow anaerobic fixed bed reactors

机译：顺流式厌氧固定床反应器处理猪场废物

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A study of the role of the depth in the performance of laboratory-scale down-flow anaerobic fixed-bed reactors (DFAFBR) was carried out at different nominal hydraulic retention times (HRT_N) using piggery waste as substrate at different influent concentrations (2, 4, 6 and 8 g COD/L). The profiles of soluble chemical oxygen demand (COD) (SCOD), organic nitrogen (O.N.), ammonia nitrogen (A.N.), pH and electrical conductivity (E.C.) through the reactor depths showed an initial highly active zone, which was located around the first half of the reactor depth, and a second zone with a lower biological activity. It was found that the depth of the active zone decreased as the HRT_N increased and that the slopes of the profiles obtained increased with the rise in the influent concentration. A hydraulic test showed an increase in the dispersion number when the HRT_N increased. The reactors showed a hydraulic pattern between plug-flow and back-mix. The real values of HRT(Θ) also defined as real contact times were determined to be 0.7, 2.1, 3.4, 4.7, 6.4 and 8 days for values of HRT_N of 1, 2, 3, 4, 5 and 6 days, respectively. It was found that the concentration of SCOD within the reactor decreased exponentially with the increase in the value of θ. Additionally, the influent concentration had a strong influence on the SCOD variation concentration, mainly at values of θ under 1.5 days, which corresponded to the first part of the reactors.
机译：在不同的名义水力停留时间（HRT_N）下，以猪粪为底泥，在不同的进水浓度下，对深度在实验室规模的下流式厌氧固定床反应器（DFAFBR）性能中的作用进行了研究（2， 4，6和8 g COD / L）。通过反应器深度的可溶性化学需氧量（COD）（SCOD），有机氮（ON），氨氮（AN），pH和电导率（EC）的分布图显示了一个初始的高活性区，该区位于第一个反应器深度的一半，以及生物活性较低的第二个区域。发现随着HRT_N的增加，活动区的深度减小，并且获得的剖面的斜率随着进水浓度的增加而增加。水力测试显示，当HRT_N增加时，分散数增加。反应器在活塞流和回混之间显示出水力模式。对于HRT_N值分别为1、2、3、4、5和6天，HRT（Θ）的实际值也定义为实际接触时间，分别为0.7、2.1、3.4、4.7、6.4和8天。已经发现，随着θ值的增加，反应器内SCOD的浓度呈指数下降。此外，进水浓度对SCOD变化浓度有很大影响，主要在1.5天以下的θ值上，这对应于反应器的第一部分。

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