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Intermittent operating characteristics of an ecological soil system with two-stage water distribution for wastewater treatment

机译：具有两级配水的污水处理生态土壤系统的间歇运行特征

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Ecological soil systems (ESSs) are usually used to remove nitrogen from wastewater. Due to the poor denitrification performance of traditional ecological soil systems (ESSs), this study proposes a two-stage water distribution system to improve the nitrogen removal. The effects of different distribution ratios on the system treatment effect were studied in an intermittent operation mode. After determining the optimal distribution ratio and intermittent operation conditions, the dynamics of system inflow, outflow, and nitrogen removal were monitored. Theoretical analysis of the denitrification mechanism was carried out. The results showed that the optimum water distribution ratio was 2: 1, and a mean total nitrogen removal rate of 60.42% was achieved, which is 23.09% greater than that is typically achieved by the single-section ecological system. Under optimum distribution ratio conditions, the system also demonstrated effective removal of chemical oxygen demand (COD), total phosphorus (TP) and ammonia nitrogen (NH4+-N), allowing the effluent to satisfy China's urban sewage treatment plant level B emission standards. (C) 2018 Elsevier Ltd. All rights reserved.
机译：生态土壤系统（ESS）通常用于去除废水中的氮。由于传统生态土壤系统（ESS）的反硝化性能差，因此，本研究提出了一种两阶段的配水系统，以提高氮的去除率。在间歇运行模式下研究了不同分配比对系统处理效果的影响。确定最佳分配比和间歇运行条件后，监测系统流入，流出和脱氮的动力学。对反硝化机理进行了理论分析。结果表明，最佳水分配比为2：1，平均总氮去除率达到60.42％，比单节生态系统通常实现的平均去除率高23.09％。在最佳分配比条件下，该系统还显示出有效去除化学需氧量（COD），总磷（TP）和氨氮（NH4 + -N）的能力，使废水达到了中国城市污水处理厂的B级排放标准。 （C）2018 Elsevier Ltd.保留所有权利。

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