Department of Civil & Environmental Engineering, Virginia Tech, Blacksburg, VA 24061, USA.
Water Res. 2011 Jan;45(2):618-24. doi: 10.1016/j.watres.2010.08.014. Epub 2010 Aug 17.
A unique sludge digestion system consisting of anaerobic digestion followed by aerobic digestion and then a recycle step where thickened sludge from the aerobic digester was recirculated back to the anaerobic unit was studied to determine the impact on volatile solids (VS) reduction and nitrogen removal. It was found that the combined anaerobic/aerobic/anaerobic (ANA/AER/ANA) system provided 70% VS reduction compared to 50% for conventional mesophilic anaerobic digestion with a 20 day SRT and 62% for combined anaerobic/aerobic (ANA/AER) digestion with a 15 day anaerobic and a 5 day aerobic SRT. Total Kjeldahl nitrogen (TKN) removal for the ANA/AER/ANA system was 70% for sludge wasted from the aerobic unit and 43.7% when wasted from the anaerobic unit. TKN removal was 64.5% for the ANA/AER system.
研究了一种独特的污泥消化系统，该系统由厌氧消化、好氧消化和再循环步骤组成，其中好氧消化器中的浓缩污泥被循环回厌氧单元。研究目的是确定其对挥发性固体（VS）减少和氮去除的影响。结果发现，与传统的中温厌氧消化相比，组合的厌氧/好氧/厌氧（ANA/AER/ANA）系统提供了 70%的 VS 减少，而 SRT 为 20 天，而与 15 天厌氧和好氧 SRT 的组合厌氧/好氧（ANA/AER）消化相比，减少了 62%。对于从好氧单元中浪费的污泥，ANA/AER/ANA 系统的总凯氏氮（TKN）去除率为 70%，而从厌氧单元中浪费的污泥去除率为 43.7%。对于 ANA/AER 系统，TKN 去除率为 64.5%。
