Mitigation of nitrous oxide emissions from wastewater treatment systems using nitrous oxide respiring bacteria

使用一氧化二氮呼吸细菌减少废水处理系统中一氧化二氮的排放

• 批准号: 515585785
• 负责人: Professorin Dr. Susanne Lackner
• 金额: --
• 依托单位: Arbeitsgruppe Microbial Energy Conversion and Biotechnology
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/515585785?language=en
• 关键词: Mitigation; nitrous; oxide; emissions; wastewater

Nitrous oxide (N2O; laughing gas) is a potent greenhouse gas and ozone depleting substance. Over the last century the atmospheric concentration of N2O has been constantly on the rise as a consequence of the invention of man-made nitrogen fixation (the Haber-Bosch process) and intensification of agricultural fertilization practices that resulted in a severe anthropogenic imbalance of the global biogeochemical nitrogen cycle. Despite the fact that N2O emissions have been recognized to play an important role in climate change, corresponding mitigation strategies remained underexplored. The aim of this interdisciplinary and collaborative project is to investigate N2O respiring bacteria (NrB) and their applicability to mitigate N2O emissions from wastewater treatment plants. The two main objectives are (i) to identify the best-suited NrB for the task and (ii) to expose these organisms under continuous conditions that are realistic for wastewater treatment. The work program includes a thorough microbiological characterization of representative NrB in short-term batch experiments including scrutiny of nitrous oxide respiration towards the presence of dissolved oxygen and other relevant factors such as carbon source and impact of the wastewater matrix. Suitable NrB will be exposed to wastewater-like conditions in continuous long-term experiments. These trials will be performed in lab-scale reactors under varying conditions, e.g. dynamic changes in the dissolved oxygen concentration. The project will provide a suitability assessment regarding the use of NrB under wastewater conditions and the implementation of NrB in wastewater treatment systems. It will also contribute to exploit the almost untouched natural resource of N2O respiring bacteria.

一氧化二氮（N2 O;笑气）是一种强有力的温室气体和臭氧消耗物质。在过去的世纪，大气中N2 O的浓度一直在不断上升，这是由于人工固氮（Haber-Bosch过程）的发明和农业施肥实践的强化，导致全球地球化学氮循环的严重人为失衡。尽管N2 O排放已被确认在气候变化中发挥重要作用，但相应的减缓战略仍未得到充分探讨。这个跨学科和合作项目的目的是调查N2 O呼吸细菌（NrB）及其适用性，以减轻污水处理厂的N2 O排放。两个主要目标是（i）确定最适合的NRB的任务和（ii）暴露这些生物体在连续的条件下，是现实的废水处理。该工作计划包括在短期批量实验中对代表性NrB进行彻底的微生物表征，包括对溶解氧和其他相关因素（如碳源和废水基质的影响）的氧化亚氮呼吸的审查。合适的NrB将在连续的长期实验中暴露于废水样条件。这些试验将在实验室规模的反应器中在不同的条件下进行，例如溶解氧浓度的动态变化。该项目将提供有关在废水条件下使用NrB以及在废水处理系统中实施NrB的适用性评估。它还将有助于开发几乎未被触及的N2 O呼吸细菌自然资源。