Development of a continuous single tank nitrification-denitrification process

连续单槽硝化反硝化工艺的开发

基本信息

批准号：
07455210
负责人：
TSUNO Hiroshi
金额：
$ 3.65万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

Continuous single tank nitrification-denitrification process was developed to overcome the lssues pointed out in the conventional nitrogen removal processes. Drafttube type reactor was applied to sewage treatment and operational and design parameters of this reactor were examined. Ability of aerobic denitrifier is utilized was also examined.Empirical equations on velocity of circulating flow and K_La in the draft-tube type reactor are constructed both experimentally and theoretically. Based on the results, continuous sewage treatment was performed. The results showed that 70-75% TN removal efficiency can be obtained in this reactor. It was also found that both aerobic zone ratio and anoxic zone ratio are necessary to be kept more than 0.35 to obtain more than 80% of both nitrification and denitrification ratio. C / N ratio in the influent is necessary to be kept about 3 (mg C / mgN). The ratio of draft tube diameter to reactor diameter (D_1 / D_0) influences TN removal efficiency. In the reactor which has effective depth of 4m, more than 70% TN can be removed only when D_1 / D_0 is 0.19. Analysis of DO decreasing rate in the annulus part shows that the higher effective depth of the reactor is, the easier both aerobic and anoxic zone can be created. Operational and designed parameters for nitrogen removal in the draft tube type reactor were examined extnsively by using the mathematical model.A selective determination method of the aerobic denitrifier in the mixed liquor is developed with immuno assay. Examination by using the mathematical model shows that the ratio of aerobic denitrifier increased in the mixed liquor by increasing BODMLSS loading rate.

连续单槽硝化反硝化工艺的开发是为了克服传统脱氮工艺中指出的问题。将尾水管式反应器应用于污水处理，并对该反应器的运行和设计参数进行了检验。并考察了好氧反硝化器的利用能力。从实验和理论上建立了尾水管式反应器中循环流速和K_La的经验方程。根据结果，进行了连续污水处理。结果表明，该反应器可以获得70-75%的TN去除效率。研究还发现，好氧区比和缺氧区比均需保持在0.35以上，才能获得80%以上的硝化和反硝化率。进水C/N比需保持在3（mg C/mgN）左右。尾流管直径与反应器直径之比（D_1 / D_0）影响TN去除效率。在有效深度为4m的反应器中，只有当D_1/D_0为0.19时，才能去除70%以上的TN。环空部分DO下降率分析表明，反应器有效深度越高，越容易形成好氧区和缺氧区。利用数学模型对尾流管式反应器的脱氮操作和设计参数进行了广泛的检验。建立了免疫分析法选择性测定混合液中好氧反硝化剂的方法。通过数学模型检验表明，通过提高BODMLSS负载量，可以提高混合液中好氧反硝化菌的比例。