气升式环流反应器在生化处理中的中试试验  

Pilot Test of Airlift Loop Reactor in Biochemical Treatment

作　　者：吴振虎 顾镛 袁方 杨强[1] WU Zhenhu;GU Yong;YUAN Fang;YANG Qiang(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237

出　　处：《水处理技术》2024年第8期98-102,共5页Technology of Water Treatment

基　　金：国家自然科学基金(52025103,52200053)。

摘　　要：生化处理是炼油废水处理过程中的关键环节,目前的生化处理工艺以氧化塘、SBR为主,但好氧反应区域存在气液混合不均匀、发泡尺寸较大等问题,进而导致氧气利用率低、能耗高。为提高生化反应效率,缩短曝气时间,本文设计了气升式环流反应器(ALR),通过安装微细气泡曝气盘配合曝气环产生分形气泡以强化气-液-固三相传质和混合,将二级生化处理单元中的好氧反应区和沉淀区集成在同一个反应器内,并开展了中试试验。研究对比了ALR和SBR对气浮出水的处理效果,衡量了两者的技术经济性指标。试验结果表明:在ALR与SBR在油含量、COD和氨氮去除效果相当的情况下,ALR的污泥负荷提升了10倍,COD容积负荷提升了5倍;同时,ALR的吨水处理的鼓气量减少了57%,吨水处理占地面积仅为SBR的50%左右,吨水处理的能耗降低了22.9%,解决了传统生化处理工艺占地面积大、能耗高等问题,为未来生化反应器的升级改造提供了重要参考。Biological treatment is a critical process in the treatment of refinery wastewater.Among the biological treatment methods,oxidation ponds and sequencing batch reactors(SBR) are commonly used in the current state.However,these processes suffer from insufficient gas-liquid mixing and the generation of relatively large-size bubbles,leading to low oxygen utilization efficiency and high energy consumption.To improve the efficiency of biological reactions and reduce aeration time,this study designed an Airlift Loop Reactor(ALR).The ALR enhanced gas-liquid-solid mass transfer and mixing by installing a microbubble aerator in combination with an aeration loop to generate fractal bubbles of different sizes.It integrates the aerobic reaction and sedimentation zones of biological treatment into a single reactor and conducts pilot-scale experiments.A comparison of the treatment performance of ALR and SBR on effluent from dissolved air flotation(DAF) was conducted,and the technical and economic indicators of the two processes were evaluated.The experimental results showed that the ALR and SBR exhibited similar performance in terms of oil removal,but the COD,ammonia nitrogen removal,and ALR increased the sludge load by 10 times and the COD volumetric load by 5 times.Additionally,the ALR reduced the aeration rate per ton of treated water by 57%,occupying only about 50% of the area required by the SBR and reducing energy consumption per ton of treated water by 22.9%.This addresses issues associated with the large footprint and high energy consumption of traditional biological treatment processes,providing valuable insights for the upgrade and development of biological reactors in the future.

关 键 词：生化处理 炼油废水 气升式环流反应器 SBR 

分 类 号：X742[环境科学与工程—环境工程]