Zupanèiè Gregor D, Grilc Viktor, Ros Milenko, Uranjek-Zevart Natasa
National Institute of Chemistry, Hajdrihova 19, PO Box 660, SI-1001, Ljubljana, Slovenia.
Water Sci Technol. 2008;58(6):1237-43. doi: 10.2166/wst.2008.351.
An autothermal aerobic sequencing batch process for sludge digestion and "class A" biosolids production was developed. The process was tested in laboratory and pilot scale size up to 150 PE, which can be considered a full scale size in some cases. In this process the maximum temperatures of 61.2 degrees C and 60.2 degrees C were achieved in laboratory scale in pilot scale equipment, respectively. The degradation efficiency of total chemical oxygen demand of sludge was between 50 and 70%. Similar results were achieved using pure oxygen in laboratory scale and oxygen/air mixture 1:1 by volume. The reactor scale greatly affects the achievement of thermophilic temperature. In smaller sizes the convective heat losses are the prevailing heat sink and the process is unable to produce enough heat to reach thermophilic temperature. Larger systems produce excess heat and can be installed with less intense aeration systems. The limit of air aeration system is at the size of about 500 PE.
开发了一种用于污泥消化和“A级”生物固体生产的自热好氧序批式工艺。该工艺在实验室和中试规模（高达150人口当量，在某些情况下可视为全规模）进行了测试。在此工艺中，实验室规模和中试规模设备分别达到了61.2℃和60.2℃的最高温度。污泥总化学需氧量的降解效率在50%至70%之间。在实验室规模下使用纯氧以及按体积比1:1的氧气/空气混合物也取得了类似结果。反应器规模对嗜热温度的实现有很大影响。在较小规模时，对流热损失是主要的热汇，该工艺无法产生足够热量达到嗜热温度。较大系统会产生过多热量，并且可以安装曝气强度较小的系统。空气曝气系统的极限规模约为500人口当量。
