| 全自养硝化污泥的颗粒化过程研究 |
| 摘要点击 1523 全文点击 1767 投稿时间：2008-11-16 修订日期：2009-05-07 |
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| 中文关键词 好氧颗粒污泥 自养污泥 硝化 颗粒化 废水处理 机制 |
| 英文关键词 aerobic granular sludge autotrophic sludge nitrification granulation wastewater treatment mechanism |
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| 中文摘要 |
| 利用SBR反应器，以浓度（以N计，下同）120～650 mg/L的自配氨氮废水，在0.48～3.60 kg/(m3·d)的氨氮负荷下，探讨了自养硝化颗粒污泥的形成过程．结果表明，以硝化污泥接种，氨氮负荷为0.48 kg/(m3·d)，温度为30℃±2℃，逐渐缩短沉淀时间至10 min的条件下，硝化颗粒可以在第22 d形成，并在第43 d进入相对稳定期，平均粒径达到500 μm左右．颗粒污泥的平均粒径变化经历了迟滞期、快速增长期和稳定期3个阶段．污泥平均粒径由接种污泥的127 μm增长到稳定期的500 μm左右．在快速增长期，平均粒径增长速度可达12 μm/d．成熟颗粒污泥的形状规则、分界清晰，分布有大量杆菌，粒径>300 μm的颗粒污泥所占比例达74.6%，污泥相中已基本没有絮状污泥．污泥在颗粒化过程中，颜色由接种污泥的灰褐色转变为颗粒污泥的黄红色．硝化颗粒污泥表面分布有大量杆菌和块状的EPS结构. |
| 英文摘要 |
| The formation of aerobic granular sludge was investigated by seeding completely autotrophic nitrifying sludge in sequencing batch reactors (SBR) using synthetic wastewater containing ammonia in the range of 120-650 mg/L under the loading rates of 0.48-3.60 kg/(m3·d). The experimental results indicated that the granular sludge could be formed on day 22 in SBR by inoculating nitrifying sludge when ammonium loading rate was 0.48 kg/(m3·d), temperature was 30℃±2℃ and the settling time was gradually decreased to 10 min. The size variation of granular sludge underwent three stages: stagnant, rapid increase and stable stages. The granules kept increasing in size to around 500 μm at rate of 12 μm/d and became stable on 43 days. The mature granules held regular shapes and clear outline. The granular sludge with diameter larger than 300 μm accounted for 74.6%, there was almost no flocculate sludge in the reactor. During the granulation process, the color of the sludge became yellow reddish from grey. There were great amount of bacillus and clump of EPS distributed on the surface of granular sludge. |
