等负荷下好氧颗粒污泥的脱氮特性研究-环境工程专业论文.docxVIP

华中科技大学硕士学位论文 华 中 科 技 大 学 硕 士 学 位 论 文 II II Abstract In recent years, aerobic granular sludge, as a new biological wastewater treatment technology, has been given much attention. It is featured by high biomass, excellent settling ability and so on，and its application in nitrogen removal is important in the research. This research focused on the characteristics of nitrogen removal of aerobic granular sludge. The cultivation process and nitrogen removal process were investigated, in order to provide reference for industrial application in the future. The research consists of two parts. The first was the cultivation of aerobic granular sludge, which investigated the effect of Ca2+ on the formation of aerobic granular sludge. The influent concentrations of CaCl2 were 60mg/L(A) and 0mg/L(B) in two SBRs, respectively. The results showed that Ca2+ had no significant effect on the granulation but the stability and maturity of aerobic granules were seriously affected. In the first 30th day, the average particle size of aerobic granular sludge in two reactors were both 0.26mm, while the granular sludge in reactor B was irregular and filamentous bacteria existed. In the 82th day, aerobic granular sludge in reactor A had smooth edge, compact structure, and regular shape. The SVI, MLSS, average particle size and MLVSS/MLSS were 50mL/g, 4500mg/L, 0.76mm and 0.4, respectively. Furthermore, NH3-N removal efficiency was perfect, and the removal rate could reach 99%. However in reactor B, no Ca2+ was added, the granules could not successfully grow up, and too much filamentous bacteria was in the sludge, leading to failure of cultivation finally. The second part of the research focused on nitrogen removal characters of aerobic granular sludge under the same volume loading and the nitrogen removal process was analyzed. The operating cycle of reactor A and reactor B was 6h and 12h, respectively. In equal volume loading, reactor B had high and stable average ammonia nitrogen removal rate