Identification of optimal parameters for treatment of high-strength ammonium leachate by mixed communities of heterotrophic nitrifying/ aerobic denitrifying bacteria
Identification of optimal parameters for treatment of high-strength ammonium leachate by mixed communities of heterotrophic nitrifying/ aerobic denitrifying bacteria
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DOI：
10.1016/j.biortech.2021.125415
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发表时间：
2021-06-28
影响因子：
11.4
通讯作者：
Holmes, Dawn E.
中科院分区：
文献类型：
--
作者：
Liu, Xinying;Dang, Yan;Holmes, Dawn E.
异养硝化好氧反硝化细菌（HNADB）对于高浓度铵渗滤液的部分硝化处理具有重要意义。然而，它们在混合反应器系统中实现最佳性能的条件尚未确定。在这项研究中，确定了最佳参数，包括游离氨（FA）浓度低于40毫克/升，溶解氧浓度为1.2毫克/升，碳氮比为5，回流比为4。这些条件应用于连续缺氧/好氧膜移动生物膜反应器处理高总铵氮（TAN = 1400毫克/升）的原始焚烧渗滤液。氨转化率和脱氮率分别达到99%和86%。当 FA 浓度高于 25 mg/L 时，自养氨氧化细菌受到抑制。 HNADB，特别是副球菌属物种，在高 FA (25-40 mg/L) 下有助于铵转化。这些结果表明，具有高 TAN 和 FA 的渗滤液可以使用支持 HNADB 生长的参数进行处理。
Heterotrophic nitrifying and aerobic denitrifying bacteria (HNADB) are important for partial nitrification treatment of high strength ammonium leachate. However, conditions for their optimal performance in mixed reactor systems have yet to be determined. In this study, optimal parameters were identified and included free ammonia (FA) concentrations below 40 mg/L, a dissolved oxygen concentration of 1.2 mg/L, a carbon to nitrogen ratio of 5 and a reflux ratio of 4. These conditions were applied to a continuous anoxic/oxic membrane moving biofilm reactor treating raw incineration leachate with high total ammonium nitrogen (TAN = 1400 mg/ L). Ammonium conversion and nitrogen removal efficiencies of 99% and 86% were achieved. Autotrophic ammonia oxidizing bacteria were inhibited at FA concentrations above 25 mg/L. HNADB, particularly Paracoccus species, contributed to ammonium conversion at high FA (25-40 mg/L). These results show that leachate with high TAN and FA can be treated using parameters that support the growth of HNADB.