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厌氧氨氧化污泥驯化及其工艺条件优化【字数:7963】

2024-11-03 09:27编辑: www.jxszl.com景先生毕设

目录
摘要Ⅱ
关键词Ⅱ
AbstractⅢ
引言
引言1
1材料与方法1
1.1实验装置 1
1.2接种污泥 1
1.3实验用水 1
1.4实验方法 2
1.4.1厌氧氨氧化污泥驯化 2
1.4.2进水溶解氧浓度对厌氧氨氧化反应的影响2
1.4.3底物浓度对厌氧氨氧化反应的影响2
1.4.4进水总氮容积负荷对厌氧氨氧化反应的影响2
1.5分析方法 3
1.5.1测定项目与方法 3
1.5.2计算公式 3
2结果与分析3
2.1厌氧氨氧化污泥驯化4
2.2进水溶解氧浓度对厌氧氨氧化反应的影响5
2.3底物浓度对厌氧氨氧化反应的影响7
2.4进水总氮容积负荷对厌氧氨氧化反应的影响9
3讨论 10
致谢12
参考文献12
厌氧氨氧化污泥驯化及其工艺条件优化
摘要
本课题研究目的是在富集驯化厌氧氨氧化污泥的基础上优化工艺条件,建立高效的厌氧氨氧化系统。首先在批式ASBR中接种活性污泥并加入人工模拟废水,经过120d运行成功驯化出了稳定的厌氧氨氧化污泥,氨氮和亚硝氮的去除率分别稳定在95%和80%以上。进一步研究了溶解氧浓度和底物浓度对厌氧氨氧化反应的影响,得出最适工艺条件为溶解氧小于等于3 mg/L,底物浓度在氨氮300 mg/L和亚硝氮400 mg/L以下。在连续进水方式下,通过缩短水力停留时间和提高底物浓度,使厌氧氨氧化反应器的总氮容积负荷成功提高到0.464 kg/(m3d),并实现了稳态运行。本研究结果对于高氨氮废水的深度脱氮处理具有潜在应用价值。
ACCLIMATION OF ANAMMOX SLUDGE AND PROCESS OPTIMIZATION
ABSTRACT
The present study was aimed to establish highefficiency anaerobic ammoni *51今日免费论文网|www.51jrft.com +Q: ^351916072
a oxidation (ANAMMOX) system through acclimation of ANAMMOX sludge and process optimization. Acclimation of ANAMMOX sludge was initiated in an anaerobic sequencing batch reactor (ASBR) by using artificial wastewater and inoculation of activated sludge. After an acclimation period of about 120 days ANAMMOX bacteria were successfully enriched as indicated by high ammonia removal rate of 95% and nitrite removal rate of 80%. The effects of dissolved oxygen (DO) and substrate concentration on the ANAMMOX activity were further investigated in ANAMMOX reactor operating in batch mode and the following process condition was achieved: DO≤ 3 mg/L, NH4+N≤ 300 mg/L and NO2N≤ 400 mg/L. In subsequent experiment steadystate operation was achieved in continuous mode and the influent volumetric load was successfully increased up to 0.464 kg/ (m3 d) by shortening hydraulic retention time (HRT) and raising the substrate concentration. Results from the present study would be of good potential for nitrogen removal from highstrength ammoniabearing wastewater.
Key words: anaerobic ammonia oxidation;biological nitrogen removal;concentration of substrate;dissolved oxygen;influent TN volumetric load
引言
目前由于人类生产生活产生了大量含氮污水,这不仅影响了氮素在自然界的正常循环,同时也带来了严重的环境污染问题,因此脱氮技术是个重要的研究热点。传统的生物脱氮技术基建投资高,脱氮效率低,不适合处理高浓度含氮污水[1],国内外学者提出了多种新型生物脱氮技术,其中厌氧氨氧化(ANAMMOX)技术的优点尤为突出。该技术是利用厌氧氨氧化菌,在厌氧条件下将氨氮氧化生成氮气来实现脱氮的[2]。利用该反应进行生物脱氮,不需要进行外部氧气供应,也不需要外加有机物,因此效率高,而能耗、运行费用低[3]。但是ANAMMOX菌生长缓慢,对环境因素要求苛刻,很难快速启动反应系统,因此这成为了该技术工程化应用的最大难点。所以研究ANAMMOX的影响因素,对于快速富集ANAMMOX菌有重要意义。

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