Abstract This study investigated the denitrification potential of an optimized solid-phase filter with activated carbon fiber (ACF) setting at the top and bottom under hydraulic retention time (HRT) shorter than 60 min from the synthetic secondary effluent. The results showed that, high nitrate removal efficiencies (>99 %) were obtained in reactors filled with poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) 3020 at initial stage of start-up. During stable operation under either HRT 40 min or 30 min, the reactor with PHBV 3020 as carrier achieved 90 %–100 % nitrate removal without nitrite accumulation. Moreover, it reached the maximum denitrification rates of 41.8 mg-N/Lh at HRT of 30 min which was significantly higher than that of the reactors filled by ACF/quartz grains and quartz grains at top and bottom. Microbial community in this reactor was dominated by the phylum Proteobacteria as well as Bacteroidetes. The ACF worked as favorable habitat for denitrifying bacteria Hydrogenophaga, Thiothrix, Desulfomicrobium and Sulfurimonas. The genera Ottowia, Limnohabitans, and Propionivibrio attached to ACF at top tended to degrade remaining organics. The optimized solid-phase denitrification filter with ACF showed good application potential for nitrate removal from the secondary effluent.

中文翻译：

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工艺安全与环保：一种优化的固相反硝化过滤器，采用活性炭纤维进行二次出水处理

摘要 本研究调查了在合成二级出水的水力停留时间 (HRT) 短于 60 分钟的情况下，顶部和底部装有活性炭纤维 (ACF) 的优化固相过滤器的反硝化潜力。结果表明，在启动初期，填充有聚（3-羟基丁酸-共-3-羟基戊酸）（PHBV）3020 的反应器获得了高硝酸盐去除效率（>99%）。在 HRT 40 分钟或 30 分钟的稳定运行期间，以 PHBV 3020 为载体的反应器实现了 90%–100% 的硝酸盐去除，而没有亚硝酸盐积累。此外，它在 HRT 30 分钟时达到了 41.8 mg-N/Lh 的最大反硝化率，明显高于顶部和底部填充 ACF/石英颗粒和石英颗粒的反应器。该反应器中的微生物群落以变形杆菌门和拟杆菌门为主。ACF 是反硝化细菌 Hydrogenophaga、Thiothrix、Desulfomicrobium 和 Sulfurimonas 的有利栖息地。附着在 ACF 顶部的 Ottowia、Limnohabitans 和 Propionivibrio 属倾向于降解剩余的有机物。优化的带有 ACF 的固相反硝化过滤器在去除二级出水中硝酸盐方面显示出良好的应用潜力。