实际氧转移效率测定方法探讨及工程验证  

Discussion on the measurement method of actual oxygen transfer efficiency and engineering verification

作　　者：韩文杰 周家中 刘妍 余军 贺珊珊 温巧贤 彭进湖 吴迪 HAN Wenjie;ZHOU Jiazhong;LIU Yan;YU Jun;HE Shanshan;WEN Qiaoxian;PENG Jinhu;WU Di(Qingdao Spring Water Treatment Co.,Ltd.,Qindao 266510,China;Dongguan Water Group Engineering Co.,Ltd.,Dongguan 523113^China;Central Southerti China Municipal Engineering Desigfi and Research Institute Co.,Ltd.,Wuhcui 430014,China;Dongguan Water Group Co.,Ltd.,Dongguan 523106,China)

机构地区：[1]青岛思普润水处理股份有限公司,青岛266510 [2]东莞市水务集团工程有限公司,东莞523113 [3]中国市政工程中南设计研究总院有限公司,武汉130011 [4]东莞市水务集团有限公司,东莞523106

出　　处：《给水排水》2022年第2期25-32,共8页Water & Wastewater Engineering

基　　金：青岛西海岸新区自主创新重大专项(2019-20)。

摘　　要：为探究污水处理系统曝气设备实际氧转移效率(AOTE)与标态氧转移效率(SOTE)之间的关系及适用条件,建立了AOTE与SOTE的关系模型,探讨了传统SOTE测定方法的局限性,提出了用改进的气体分压法和需氧量核算法测定AOTE.并在微污染水、市政污水两个实际工程项目中进行了验证,同步分析了悬浮载体存在时对SOTE的影响。结果表明.AOTE相比SOTE更适合作为不同水质、不同工艺氧转移效率的评价指标,建议采用气体分压法测定并通过AOR加以校对。气体分压法测定应根据测定区功能及环境条件,合理选择是否忽略二氧化碳,水蒸气影响。对于市政污水,忽略二氧化碳影响会带来约10%的测定误差。微污染水实际氧转移效率低于市政污水,主要受环境影响因子(E_(B))较低所致;穿孔曝气系统结合悬浮载体可提高系统标态氧转移效率至4.0%/m以上.达到与微孔曝气接近的水平,提高穿孔曝气系统的悬浮载体填充率可增加SOTE。悬浮载体的投加通过气泡切割和延长气液接触时间提高了SOTE。对于MBBR工艺,悬浮载体均匀流化是确保该工艺正常运行、良好传质的关键。In order to research the relative relationship and applicable conditions between actual oxygen transfer efficiency(AOTE) and standard oxygen transfer efficiency(SOTE) of aeration equipment in wastewater treatment system, the relationship model between AOTE and SOTE is established, the limitations of traditional SOTE determination methods are discussed, oxygen demand accounting method are proposed to measure the AOTE, which are verified in municipal wastewater and the micro-polluted water simultaneously, the influence of suspended carrier on SOTE is analyzed. The results show that AOTE is more suitable to be used as the evaluation index of oxygen transfer efficiency of different water quality and different processes. It can be measured by gas partial pressure method, and can be calibrated by AOR. For the determination of gas partial pressure method, whether to ignore the influence of carbon dioxide and water vapor shall be reasonably selected according to the function and environmental conditions of the measurement area. For municipal wastewater, ignoring the influence of carbon dioxide will lead to a determination error of about 10%. Due to low environmental impact factor(E;), the AOTE of micro-polluted water is lower than that of municipal wastewater;The perforated aeration system combined with suspended carrier can make E;reach more than 4.0%/m, which is close to the same level as microporous aeration. Improving the filling rate of suspended carrier of perforated aeration system can strengthen the cutting of carrier to bubbles and prolong the gas-liquid contact time, so as to improve SOTE. For MBBR Process, uniform fluidization of suspended carrier is the key to ensure the normal operation and good mass transfer of the process.

关 键 词：氧转移效率 微孔曝气 穿孔曝气 纯膜MBBR 微污染水 市政污水 填料 

分 类 号：TU992[建筑科学—市政工程] X70[环境科学与工程—环境工程]