静态螺旋切割优化A^(2)/O曝气工艺处理生活污水的研究

Experimental study on aeration process optimization of A^(2)/O domestic sewage treatment by static spiral cutting

A^(2)/O是一种常见的生活污水处理工艺,其好氧段的曝气方式通常采用传统的底部曝气,溶氧效率较低。为了实现对污水高质高效的处理,基于气-液传质强化和流体力学理论,自主开发了一种无动力驱动静态螺旋切割器,可将气-液混合溶液中的大气泡切割细化成微纳米量级的小气泡,可在较短的时间内提高溶氧,且控制气体流量即可实现对溶氧量的调节。对无曝气、传统底部曝气采用静态螺旋切割进行对比实验,结果表明:与传统底部曝气工艺相比,静态螺旋切割对固体悬浮物(SS)的去除率提高了12.3%,对COD的去除率提高了5.6%,对氨氮(NH_(3)-N)和总磷(TP)的去除率分别提高了约8.1%和8.5%,饱和态溶氧(DO)浓度提高了48.2%。静态螺旋切割器具有结构简单和经济性好的优势,因此对于优化污水处理曝气具有较好的应用前景。

A^(2)/O is a common domestic sewage treatment process.The aeration method of aerobic section is usually the traditional bottom aeration,which has low oxygen dissolution efficiency.In order to achieve high quality and efficient treatment of sewage,a static spiral cutter without power drive was developed based on gas-liquid mass transfer enhancement and fluid mechanics theory.Large bubbles in gas-liquid mixture could be cut into micro-nanometer scale small bubbles,which can improve dissolved oxygen in a short time,and control gas flow to achieve the adjustment of dissolved oxygen.Experiments with no aeration,traditional bottom aeration,and static spiral cutting were carried out.The results showed that compared with the traditional bottom aeration process,with the static spiral cutting,the removal rate of solid suspended solids(SS) increased by 12.3%,the removal rate of COD by 5.6%,the removal rates of ammonia nitrogen (NH_(3)-N) and total phosphorus (TP) were increased by 8.1% and 8.5% respectively,and the concentration of saturated dissolved oxygen (DO) was increased by 48.2%.Overall,static spiral cutter has advantages of simple structure and good economy,it has a promising application for the optimization of sewage treatment aeration.