Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077 Toulouse, France.
Bioresour Technol. 2010 Apr;101(8):2629-36. doi: 10.1016/j.biortech.2009.10.065. Epub 2009 Dec 2.
The efficiency of hyper-thermophilic (65 degrees Celsius) aerobic process coupled with a mesophilic (35 degrees Celsius) digester was evaluated for the activated sludge degradation and was compared to a conventional mesophilic digester. For two Sludge Retention Time (SRT), 21 and 42 days, the Chemical Oxygen Demand (COD) solubilisation and biodegradation processes, the methanisation yield and the aerobic oxidation were investigated during 180 days. The best results were obtained at SRT of 44 days; the COD removal yield was 30% higher with the Mesophilic Anaerobic Digestion/Thermophilic Aerobic Reactor (MAD-TAR) co-treatment. An increase of the sludge intrinsic biodegradability is also observed (20-40%), showing that the unbiodegradable COD in mesophilic conditions becomes bioavailable. However, the methanisation yield was quite similar for both processes at a same SRT. Finally, such a process enables to divide by two the volume of digester with an equivalent efficiency.
评估了高温（65°C）好氧工艺与中温（35°C）消化器偶联对活性污泥降解的效率，并将其与传统中温消化器进行了比较。对于两个污泥停留时间（SRT），21 和 42 天，在 180 天内研究了化学需氧量（COD）的溶解和生物降解过程、甲烷产量和需氧氧化。在 SRT 为 44 天时获得了最佳结果；与中温厌氧消化/高温好氧反应器（MAD-TAR）联合处理相比，COD 去除率提高了 30%。还观察到污泥内在生物降解性的增加（20-40%），表明在中温条件下不可生物降解的 COD 变得可用。然而，在相同 SRT 下，两种工艺的甲烷产量相当。最后，该工艺能够使消化器的体积减少一半，而效率相当。
