摘要
针对传统普通强化脱氮AO工艺总氮(TN)去除率较低的问题,采用规模为5万m~3/d的生物反应池开展试验。在保持总池容不变的条件下重新分配缺氧段和好氧段的池容,将其改进为“缺氧-好氧-缺氧-好氧”结构的多级AO脱氮工艺。改造后实现缺氧段水力停留时间从4.44 h提高至7.45 h,好氧段从6.70 h降低至3.69 h,新增缺氧段底部采用曝气可调和推流搅拌技术。同时采用基于DO浓度布设液态碳源投加点技术,进一步提高碳源利用率。实践结果表明,2021年多级AO工艺平均出水TN质量浓度为11.9 mg/L,平均TN去除率为61.5%,最高达77.8%,平均TN去除率比普通强化脱氮工艺下的47.6%提高了约29.2%,具有更好的脱氮效果,能实现出水TN和氨氮《城镇污水处理厂污染物排放标准》(GB 18918-2002)中的一级A稳定达标排放,同时具有一定的节能降耗效应。
The test is carried out in biological reactor with 50000 m3/d processing capacity to solve the issue of low total nitrogen(TN)removal rate in conventional enhanced denitrification anoxic/oxic(AO)process.Some technical improvements by reassigning anoxic and oxic tank volume are implemented to transform it to multi-stage AO denitrification process with AOAO structure on the condition of total tank volume invariant.Therefore,the hydraulic retention time(HRT)of anoxic section increases from 4.44 h to 7.45 h,while the HRT of oxic reduces from 6.70 h to 3.69 h.In addition,the creative technologies of adjustable aeration and agitators push flow are put into use in the bottom of the renewal anoxic section,and liquid carbon dosing positions are designed on the base of long-term monitoring in dissolved oxygen to realize more efficient carbon utilization.As a result of years’running the multisection AO process,it indicated in 2021 the average effluent TN was 11.9 mg/L and the highest TN removal rate reaches 77.8%,and the average TN removal rate is 61.5% which increased by almost 29.2% than that of 47.6% under conventional enhanced denitrification AO process.It makes clear that the multi-section AO process has better denitrification effect and can stably achieve TN and ammonia nitrogen to come up to the first A criteria of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).In addition,it can reduce power consumption and carbon source.
作者
段凯波
DUAN Kaibo(Fujian Sunyuan Environment Protection Co.,Ltd.,Fuzhou 350019,China;Fuzhou Chuangyuan Tongfang Water Affairs Co.,Ltd.,Fuzhou 350018,China)
出处
《净水技术》
CAS
2023年第5期77-83,115,共8页
Water Purification Technology
基金
福建省科技计划创新资金项目(2021C0029)。
关键词
总氮(TN)
常规强化脱氮AO
多级AO
水力停留时间
脱氮效果
total nitrogen(TN)
conventional enhanced denitrification AO
multi-stage AO
hydraulic retention time(HRT)
denitrification effect
作者简介
通信作者:段凯波(1983-),男,博士,高级工程师,主要从事污水处理技术研究及水环境监测,E-mail:duankaibo@sina.com。
