| 膜序批式生物反应器脱氮性能研究 |
| 摘要点击 3798 全文点击 1957 投稿时间：2007-10-26 修订日期：2007-11-29 |
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| 中文关键词 氮去除 膜序批式反应器 曝气强度 FISH-CLSM 交换比 |
| 英文关键词 nitrogen removal membrane sequencing batch reactor aeration strength FISH-CLSM volumetric exchange ratio |
| DOI 10.13227/j.hjkx.20081019 |
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| 中文摘要 |
| 采用厌-好氧交替膜序批式反应器， 实验室人工合成配水，连续运行300 d，对反应器脱氮性能进行了研究.结果表明，污泥浓度达到18 g·Ｌ-1时，污泥粒径大小在100 μm以上的占96%，污泥出现颗粒化.FISH-CLSM分析AOB及NOB的群落空间分布表明它们在污泥中大量存在. NH+4-N进水50 mg·Ｌ-1左右时出水在1 mg·Ｌ-1以下，硝化反应在180～210 min就可以完成.曝气强度与硝化反应速率密切相关，曝气强度为100 m3·(m2·h)-1时，NH+4-N降解速率最佳达24.25 mg·（Ｌ·h)-1，系统硝化性能稳定.影响系统脱氮的主要因素是反硝化速率，曝气强度为69 m3·（m2·h)-1时，对NO-3-N的利用率为10.98 mg·（Ｌ·h)-1，出水NO-3-N浓度为4.4 mg·Ｌ-1，滞留在厌氧段的浓度3.5 mg·Ｌ-1为最低，反硝化效果最好.曝气过量或不足时反硝化速率都低.在保证系统处理能力的同时，大的交换比0.35有利于系统脱氮运行.C/N比为2时，反硝化速率最高,>2时出现NO-2-N的积累. |
| 英文摘要 |
| Nitrogen removal performance was investigated using synthetic wastewater as feed without sludge discharge in an anaerobic/aerobic membrane sequencing batch reactor (MSBR) during 300 days operation. The results showed that MLSS in reactor was retained up to about 18 g·Ｌ-1, sludge size larger than 100 μm was 96%, and aerobic granular sludge was developed. The bacterial community observation of AOB and NOB by FISH-CLSM for sludge revealed that they were existed in larger numbers. When influent NH+4-N concentration was about 50 mg·Ｌ-1, effluent NH+4-N concentration was lower than to 1 mg·Ｌ-1, and nitrification could complete in 180_210 min. There was a good correlation between nitrification reaction and aeration strength. When aeration strength was 100 m3·（m2·h)-1, NH+4-N degradation rate 24.25 mg·（Ｌ·h)-1, and nitrification reaction in MSBR was stable. The main factor determining nitrogen removal of the system was denitrification rate, which was optimal at aeration 69 m3·（m2·h)-1, when the nitrification rate of NO-3-N 10.98 mg·（Ｌ·h)-1, effluent NO-3-N 4.4 mg·Ｌ-1, and NO-3-N in the beginning of anaerobic phase 3.5 mg·Ｌ-1. The denitrification performance was not benefited by excessive aeration or deficient aeration. Bigger volumetric exchange ratio was helpful for nitrogen removal and the system treatment capacity. The C/N ratio 2 was suitable to good denitrification rate, while there was a NO-2-N accumulation if C/N ratio was larger than 2. |
