Serna-Maza Alba, Heaven Sonia, Banks Charles J
a Faculty of Engineering and the Environment , University of Southampton , Southampton , UK.
Environ Technol. 2017 Dec;38(24):3216-3224. doi: 10.1080/09593330.2017.1291761. Epub 2017 Feb 22.
Previous studies have suggested the use of digester biogas mixing systems for in situ ammonia removal from anaerobic digestates. The feasibility of this was tested at moderate and complete gas mixing rates at mesophilic and thermophilic temperatures in a 75-L digester. Experimental results showed that at gas mixing rates typical of full-scale commercial digesters the reduction in total ammonia nitrogen concentrations would be insufficient to allow stable acetoclastic methanogenesis in mesophilic conditions, or to prevent total inhibition of methanogenic activity in thermophilic food waste digestion. Simulation based on batch column stripping experiments at 55°C at gas violent flow rates of 0.032 m m min indicated that ammonia concentrations could be reduced below inhibitory values in thermophilic food waste digestion for organic loading rates of up to 6 kg VS m day. These mixing rates are far in excess of those used in full-scale gas-mixed digesters and may not be operationally or commercially feasible.
先前的研究表明，可使用消化器沼气混合系统对厌氧消化液进行原位氨去除。在一个75升的消化器中，于中温及高温条件下，以适度和完全的气体混合速率对其可行性进行了测试。实验结果表明，在全规模商业消化器典型的气体混合速率下，总氨氮浓度的降低不足以在中温条件下实现稳定的乙酸裂解产甲烷作用，或在高温食物垃圾消化过程中防止产甲烷活性的完全抑制。基于在55°C下以0.032 m m min的气体剧烈流速进行的间歇柱式汽提实验的模拟表明，对于高达6 kg VS m 天的有机负荷率，在高温食物垃圾消化中氨浓度可降低至抑制值以下。这些混合速率远远超过全规模气体混合消化器所使用的速率，在操作或商业上可能不可行。
