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Effect of micro-aeration on anaerobic digestion of primary sludge under septic tank conditions

机译：化粪池条件下微曝气对一次污泥厌氧消化的影响

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Micro-aeration, which refers to the addition of very small amounts of air, is a simple technology that can potentially be incorporated in septic tanks to improve the digestion performance. The purpose of this study was to investigate and compare the effects of micro-aeration on anaerobic digestion of primary sludge under septic tank conditions. 1.6 L batch reactor experiments were carried out in duplicate using raw primary sludge, with 4.1 % total solids, and diluted primary sludge, with 2.1 % total solids. Reactors were operated for 5 weeks at room temperature to simulate septic tank conditions. Micro-aeration rate of 0.00156 vvm effectively solubilised chemical oxygen demand (COD) and improved the subsequent degradation of COD. Micro-aeration also increased the generation of ammonia and soluble proteins, but did not improve the reduction in total and volatile solids, or the reduction in carbohydrates. Experiments using diluted sludge samples showed similar trends as the experiments with raw sludge, which suggest that initial solids concentration did not have a significant effect on the degradation of primary sludge under septic tank conditions.
机译：微曝气是指添加少量空气的一种简单技术，可以将其掺入化粪池中以提高消化性能。这项研究的目的是调查和比较微曝气对化粪池条件下初级污泥厌氧消化的影响。使用原始粗泥（总固体含量为4.1％）和稀释的原始泥（总固体含量为2.1％），一式两份地进行1.6 L分批反应器实验。反应器在室温下运行5周以模拟化粪池的状况。 0.00156 vvm的微曝气速率可有效溶解化学需氧量（COD），并改善随后的COD降解。微曝气还增加了氨和可溶性蛋白质的产生，但并未改善总固体和挥发性固体的减少或碳水化合物的减少。使用稀释污泥样品的实验显示出与使用原始污泥的实验相似的趋势，这表明在化粪池条件下，初始固体浓度对原始污泥的降解没有显着影响。

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