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Ammonia removal in anaerobic digestion by biogas stripping: an evaluation of process alternatives using a first order rate model based on experimental findings

机译:通过沼气剥离进行厌氧消化中的氨去除:使用基于实验结果的一级速率模型评估过程备选方案

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摘要

The feasibility of biogas stripping to remove ammonia in the anaerobic digestion of source segregated food waste was investigated. It was found in batch experiments that ammonia could be removed from digestate and that the removal followed 1st order kinetics with respect to total ammonia nitrogen concentration. Increasing temperature, biogas flow rate and initial pH all increased removal rates. Using kinetic data gathered in these experiments allowed the integration of ammonia stripping with an anaerobic digestion plant to be modelled for different configurations. Four scenarios were identified: post digestion, in situ, side-stream and pre-digestion ammonia removal relating to where in the process the ammonia stripping was performed. The modelling showed that in situ ammonia removal may be best able to reduce in-digester ammonia concentrations over a wide range of organic loading rates whereas pre-digestion showed most promise in terms of application due to the flexibility to control each part of the process separately. Further experimental work is required into these scenarios to confirm their viability.
机译:研究了在源分离食品垃圾的厌氧消化过程中,沼气汽提去除氨的可行性。在间歇实验中发现,可以从消化物中去除氨,并且去除相对于总氨氮浓度遵循一级动力学。温度升高,沼气流速和初始pH值均提高了去除率。利用在这些实验中收集的动力学数据,可以针对不同配置对氨气汽提与厌氧消化装置的集成进行建模。确定了四种方案:消化后,原位,侧流和消化前的氨去除,这与在该过程中在何处进行氨汽提有关。该模型表明,就地氨去除可能最能在很宽的有机负载量范围内降低消化器中的氨浓度,而预消化由于可灵活地分别控制过程的各个部分而在应用方面显示出最大的希望。这些场景需要进一步的实验工作,以确认其可行性。

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