| 营养物质缺乏引起的好氧颗粒污泥膨胀及其恢复 |
| 摘要点击 2442 全文点击 1016 投稿时间：2011-11-21 修订日期：2012-03-11 |
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| 中文关键词 好氧颗粒污泥 污泥膨胀 碳氮磷比 SBR 废水处理 |
| 英文关键词 aerobic granular sludge sludge bulking m(COD)/m(N)/m(P) SBR wastewater treatment |
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| 中文摘要 |
| 采用5个相同的序批式反应器(sequencing batch reactor, SBR)研究了不同碳、氮、磷比条件下好氧颗粒污泥形态、沉降性能和有机物去除情况,并根据SVI30值分析了由营养物缺乏引起的好氧颗粒污泥膨胀情况及其恢复方法. 结果表明,当进水m(COD)/m(N)/m(P)为100/5.8/1.2时,颗粒污泥结构完整,颗粒密实,SVI30在15~30 mL·g-1之间波动,COD 去除率可保持在90%以上,系统总体运行稳定,没有出现污泥膨胀. 当进水m(COD)/m(N)/m(P)为100/3/0.6和100/1.9/0.4时,系统中的颗粒污泥出现解体现象,但是SVI30 值仍然低于35 mL·g-1,没有发生丝状菌膨胀; 在整个试验过程中系统COD去除率在85%以上. 当进水m(COD)/m(N)/m(P)为100/0.5/0.1和没有投加任何氮磷物质时,系统SVI30均达到150 mL·g-1,污泥难以沉降,系统发生了丝状菌污泥膨胀. 两系统COD去除率差别较大,前者COD去除率在试验后期保持在65%~80%之间,而后者COD去除率从试验前期一直降低,最后达到10%以下,系统完全崩溃. N、P营养物质缺乏引起的膨胀好氧颗粒污泥,通过补充充足营养物质运行48个周期后,2个系统膨胀污泥的沉降性能及有机物降解率完全恢复,但是污泥形态(除污泥颜色)恢复不明显. |
| 英文摘要 |
| Under 5 m(COD)/m(N)/m(P) ratios, the shape, settle ability and organic removal performance of aerobic granules were investigated in 5 identical SBRs. The performance of aerobic granules bulking and its recovery methods were also analysed based on SVI30 value. The results indicated that when m(COD)/m(N)/m(P) was 100/5.8/1.2, the granules had integral and dense structures with the SVI30 of 15~30mL·g-1 and COD removal of above 90%. The system operated stably without any bulking. When m(COD)/m(N)/m(P) was 100/3/0.6 and 100/1.9/0.4, although the granules disintegration was observed, SVI30 was lower than 35 mL·g-1and the granules had no bulking, and high COD removal was keeping at above 85%. When m(COD)/m(N)/m(P) was 100/0.5/0.1 and 100/0/0, the SVI30 in both systems reached 150 mL·g-1, and the granules was hard to settle due to sludge bulking in both systems. There is a significant difference of COD removal rate in two systems. The former COD removal rate stayed at 65%-80% in late experiment, while the latter COD removal was quite low during the early operation and finally reduced to about 10% until the system broke down. Aerobic granule bulking due to the lack of N and P could be recovered by adding sufficient nutrient to the systems. After 48 cycles’ operation, granules settle ability and organic removal were fully recovered, however there was no obvious recovery on granules morphology except for the color. |
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