| 微膨胀对好氧颗粒污泥脱氮过程中N2O产生量的研究 |
| 摘要点击 3373 全文点击 1681 投稿时间：2012-12-30 修订日期：2013-03-22 |
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| 中文关键词 低溶解氧 微膨胀颗粒污泥 污泥容积指数 去除效能 N2O产生量 |
| 英文关键词 low DO sludge micro-bulking sludge volume index (SVI) removal efficiency N2O production |
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| 中文摘要 |
| 采用控制低溶解氧 (DO)在 SBR反应器内,研究了好氧颗粒污泥微膨胀的实现; 考察了微膨胀颗粒污泥对 COD和氨氮去除效能以及温室气体N2O产生量. 结果表明,在低 DO条件下可以获得微膨胀颗粒污泥,污泥容积指数 (SVI)大都在 150~250 mL ·g-1之间. 微膨胀颗粒污泥对 COD和氨氮去除量影响不大, COD去除率从 89.45%上升到90.99%; 氨氮去除率从 77.29%降至68.29%; 硝化速率从38.95×10-3 mg ·(g ·min)-1降至 33.46×10-3 mg ·(g ·min)-1. 微膨胀颗粒污泥对 N2O产生量影响很大,微膨胀颗粒污泥 N2O产生量为2.42 mg ·m-3是没有发生微膨胀颗粒污泥N2O产生量的1.26倍. 微膨胀颗粒污泥N2O释放速率由 3.63×10-3 mg ·(L ·min)-1上升到4.72×10-3 mg ·(L ·min)-1. |
| 英文摘要 |
| Controlled low dissolved oxygen (DO) in a sequencing batch reactor (SBR) was used to study the realization of micro-expansion of aerobic granular sludge, and the removal efficiency of COD and NH4+-N as well as the production of the greenhouse gas N2O by the micro-expansion of granular sludge was investigated. The results showed that under the condition of low dissolved oxygen micro-expansion of sludge could be achieved, and the sludge volume index (SVI) was mostly in the range of 150-250 mL ·g-1. The micro-expansion of granular sludge did not have significant influence on the removal of COD and NH4+-N. The COD removal rate increased from 89.45% to 90.99%, the NH4+-N removal rate decreased from 77.29% to 68.29%, and the nitrification rate dropped from 38.95×10-3 mg ·(g ·min)-1 to 33.46×10-3 mg ·(g ·min)-1. The micro-expansion of granular sludge had a big influence on the production of N2O, and theN2O production by the micro-expanded granular sludge was 2.42 mg ·m-3, which was 1.26 times of the N2O production of the granular sludge without micro-expansion. The N2O release rate in the micro-expanded granular sludge increased from 3.63×10-3 mg ·(L ·min)-1 to 4.72×10-3 mg ·(L ·min)-1. |
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