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A potential explanation for the effect of carbon source on the characteristics of acetate-fed and glucose-fed aerobic granules

机译：碳源对乙酸和葡萄糖喂养的好氧颗粒特性影响的潜在解释

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This paper proposes a new theory to account for the effect of carbon source on the characteristics of acetate-fed and glucose-fed aerobic granules. It is well known that reactor pH can vary in response to the oxidation of glucose or sodium acetate. As such, the effects associated with the carbon sources may be explained by the changed pH. The proposal was explored by experiments. Aerobic granules were cultivated in three identical sequencing batch reactors (SBRs, R1, R2 and R3), fed with sodium acetate, glucose, glucose and maintained pH at 4.5 - 5.5 (the variation of reactor pH in the oxidation of glucose), 4.5 - 5.5 and 7.5 - 8.5 (the variation of reactor pH in the oxidation of sodium acetate), respectively, and the effects of carbon source and reactor pH on the characteristics of aerobic granules were assessed. The results showed that the characteristics of aerobic granules, including microbial structure, mixed liquor suspended solids (MLSS), sludge volume index (SVI) and nitrification-denitrification, were strongly affected by reactor pH, but were independent with the carbon source supplied. These results fully supported the validity of the new theory. The theory suggests that the cultivation of aerobic granules with glucose or sodium acetate should take more attention to reactor pH rather than carbon source itself. The implications of this theory are discussed with regards to the other common carbon sources as well as better understanding of the mechanisms of aerobic granulation.
机译：本文提出了一种新的理论来说明碳源对醋酸盐喂养和葡萄糖喂养的好氧颗粒特性的影响。众所周知，反应器pH可以响应于葡萄糖或乙酸钠的氧化而变化。这样，与碳源有关的影响可以通过改变pH值来解释。该提案已通过实验进行了探索。好氧颗粒在三个相同的顺序分批反应器（SBR，R1，R2和R3）中培养，加入乙酸钠，葡萄糖，葡萄糖并保持pH在4.5-5.5（反应器pH在葡萄糖氧化中的变化），4.5-分别评估了5.5和7.5-8.5（醋酸钠氧化过程中反应器pH的变化）以及碳源和反应器pH对好氧颗粒特性的影响。结果表明，好氧颗粒的特性，包括微生物结构，混合液悬浮固体（MLSS），污泥体积指数（SVI）和硝化-反硝化，都受到反应器pH值的强烈影响，但与所提供的碳源无关。这些结果完全支持了新理论的有效性。该理论表明，用葡萄糖或乙酸钠培养好氧颗粒应更多地注意反应器的pH，而不是碳源本身。讨论了该理论的含义，涉及其他常见碳源以及对好氧造粒机理的更好理解。

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