【作者】 吴姝媛；

【导师】 罗固源；

【作者基本信息】 重庆大学 ， 环境工程， 2007， 硕士

【摘要】 OGO工艺是本课题组在OCO工艺基础上进行试验分析及改进,形成的一种简易、高效、经济的污水脱氮除磷新工艺。该工艺目前已获得国家实用新型专利(ZL2005 2 0010545.7)。本论文结合OGO工艺特点,对该反应系统中的同时硝化反硝化脱氮现象进行了深入的探讨和试验分析。研究的具体内容如下:①研究了OGO系统中的同时硝化反硝化脱氮现象,并对其效果及原理进行了分析;②研究了OGO系统中各项运行参数(DO、C/N、MLSS等)对同时硝化反硝化脱氮的影响;③研究了活性污泥絮体特性及其与OGO系统运行效果的关系;④对OGO系统中的脱氮微生物进行了试验研究。通过以上试验研究发现:1)OGO反应系统外环中发生了明显的同时硝化反硝化脱氮现象,在进水TN和NH4+-N的浓度分别为31.15～42.26mg/L和27.53～38.58mg/L时,系统对总氮和氨氮的平均去除率分别为75.47%和84.29%,反应系统对氮素的去除57.93%是通过外环同时硝化反硝化脱氮来实现的;2)DO、C/N、MLSS的变化对OGO系统同时硝化反硝化脱氮的影响较大,系统好氧区中段适宜的溶解氧浓度为2.0mg/L左右,在保持活性污泥氮负荷基本不变的情况下,最适的进水C/N为7～18,OGO系统的活性污泥浓度应保持在3000mg/左右;3)OGO系统中硝化细菌数量和硝酸盐氮含量具有较好的正相关性,相关系数r=0.98,亚硝化菌数量和氨氮含量有一定的负相关性,相关系数r=-0.91;4)宏观分区理论、微环境理论以及微生物学理论均适用于OGO反应系统中发生的同时硝化反硝化脱氮现象。本研究是“中国西部小城镇环境基础设施经济适用技术及示范(荷兰政府赠款项目)”和国家自然科学基金课题“基于理想流态的城市污水生物处理反应技术研究”(50378095)的部分内容。本文的研究内容可以为OGO工艺的工程应用提供依据。更多还原

【Abstract】 OGO process has been formed as a modification of OCO process through test research. As a advanced technology, it has the functions of phosphorus removal and denitrification with facilitation,effectiveness and economic. OGO technology has already been approved as Utility Model Patent (ZL2005 2 0010545.7). According to the characteristic of OGO system, the dissertation carried out test and analysis on the simultaneous nitrification and denitrification (SND).The followings were studied:①The nitrogen removal effect and mechanism of simultaneous nitrification and denitrification in the OGO system were analyzed;②The effect of operating parameters (dissolved oxygen (DO) concentration, influent C/N ratio, mixed liquor suspended solids (MLSS) etc.) on the simultaneous nitrification and denitrification were studied;③Research has been done to study the relation between the activated sludge characteristic and operational effects of the OGO system;④The nitrogen removing microorganisms in OGO system were tested through the experiment.According to the above study, it is concluded that:1) The OGO system occur obvious phenomena of simultaneous nitrification and denitrification in the out-loop; when influent total nitrogen(TN) and ammonia nitrogen(NH4+-N) are 31.15～42.26 mg/L and 27.53～38.58 mg/L respectively, the average removal efficiencies of TN, NH4+-N achieve 75.47% and 84.29%; 57.93% of the nitrogen removal amount is achieved by simultaneous nitrification and denitrification in the OGO system; 2) The change of DO concentration, influent C/N ratio and MLSS influence the SND effect significantly in the OGO system, the suitable operating condition is: the DO concentration in the middle of the aerobic area is about 2.0mg/L, C/N ratio is from 7 to 18, MLSS is about 3000mg/L; 3) The correlation between nitrobacteria and nitrate nitrogen(NO3--N) is 0.98 , while the correlation between nitrosobacteria and NH4+-N is -0.91; 4) Bioreactor macro-environment, floc micro-environment and novel microorganisms with non-traditional biochemical activities for SND are existed in OGO system. The study is one of the Netherlands government grant projects (economic feasible processes and demonstrations for environmental infrastructures in western China’s small towns) and it is a part of the project“Treatment technique research of municipal sewage based on ideal flow pattern”, which is funded by state’s natural science foundation. This research acquired the values of important parameters that could be used in actual design and control as well as provide support for the engineering utilization of OGO in municipal wastewater treatment.更多还原