| 体积溶氧传递系数在好氧颗粒污泥系统中的变化特性初步分析 |
| 摘要点击 1914 全文点击 1032 投稿时间：2012-05-18 修订日期：2012-12-17 |
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| 中文关键词 体积溶氧传递系数 好氧颗粒污泥 污水处理 絮体结构 |
| 英文关键词 volumetric oxygen transfer coefficient aerobic granular sludge wastewater treatment floc structure |
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| 中文摘要 |
| 取成熟的好氧颗粒污泥,在同一测试装置中采用相同的曝气条件进行体积溶氧传递系数(kLa)的测试,当传统活性污泥和成熟好氧颗粒污泥浓度 MLSS为2000、4000、6000、8000 mg·L-1时,其 kLa(min-1)值分别为 0.5861±0.0095、0.5861±0.0272、0.5556±0.0168、0.5338±0.0268和0.6455±0.0276、0.6320±0.0755、0.6185±0.0625、0.6406±0.0555,表明颗粒污泥kLa值高于同浓度条件下的絮体污泥,且随浓度增加,絮体污泥氧传递效率下降而颗粒污泥无明显变化. 对好氧颗粒污泥进行筛分后,大颗粒和小颗粒在污泥浓度相同、体积相同、表面积相同以及个数相同的情况下二者的kLa值均无明显差别,由此可以推断,这些因素对好氧颗粒污泥 kLa的影响可以忽略. 研究结果对于污水处理厂节能运行具有一定的参考价值. |
| 英文摘要 |
| The volumetric oxygen transfer coefficient (kLa) was tested with mature aerobic granules in the same aeration measurement device and under the same aeration conditions. The kLa (min-1) was 0.5861±0.0095, 0.5861±0.0272, 0.5556±0.0168, 0.5338±0.0268 for floc sludge, and 0.6455±0.0276, 0.6320±0.0755, 0.6185±0.0625, 0.6406±0.0555 for aerobic granules, when the sludge concentration MLSS (mg·L-1) was controlled at 2000, 4000, 6000, 8000, respectively. This indicated that granular sludge exhibited higher kLa values than the flocs, and the kLa value of floc sludge decreased with the increase of the sludge concentration; however, insignificant decease was found for granular sludge. After screening of granules with different diameter, the kLa values of the aerobic granular sludge with different sizes which had the same MLSS, volume, surface area and particle number were compared, and insignificant difference was found, suggesting that the effects of these factors on the kLa of granular sludge were negligible. The findings of this work may have significance for the energy-saving operation of wastewater treatment plants. |
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