氧化沟工艺在低碳源城镇污水厂的脱氮除磷潜力研究  

Study on the Potential of Nitrogen and Phosphorus Removal in Oxida⁃tion Ditch Process in Low Carbon Source Urban Sewage Plant

作　　者：王利 马阁 WANG Li;MA Ge(Shaanxi Biaoyuan Environmental Protection Technology Co.,Ltd.,Xi'an 710076,China;School of Geography Science and Tourism,Shaanxi Normal University,Xi'an 710119,China)

机构地区：[1]陕西标远环保科技有限公司,陕西西安710076 [2]陕西师范大学地理科学与旅游学院,陕西西安710119

出　　处：《河南科技》2024年第16期84-88,共5页Henan Science and Technology

摘　　要：[目的]以某城镇污水厂为例,探讨氧化沟工艺在低碳源城镇污水厂脱氮除磷潜力挖掘的可行性,为全国其他污水厂氧化沟工艺的改造提供方向。[方法]首先关闭原氧化沟回流门并对其钢砼加固,在加固后的回流门竖向方向安装两台低扬程大流量穿墙泵,强力推进硝化液回流,使氧化沟内部回流比达到300%~400%。其次在氧化沟两个弯段处增设曝气盘,来调整氧化沟及缺氧区内的溶解氧(Dissolved Oxygen,DO)浓度。最后将原设计的单污泥回流至厌氧池,改为双污泥回流至厌氧池和氧化沟缺氧区,污泥回流比提高至100%~200%。[结果]改造后,氧化沟TN和TP的出水水质有明显提升,TN出水浓度由改造前的25~30 mg/L降低至10~19 mg/L,脱氮潜力释放了11%~22%。TP出水浓度由改造前的1~1.5 mg/L降低至0.1~0.5 mg/L,除磷潜力释放了14%~23%。[结论]通过对氧化沟回流门,曝气盘、污泥回流点及回流比的调整,氧化沟系统的脱氮除磷潜力得到进一步的挖掘与释放。当前,全国各省市级的大型污水厂中有占比很大的氧化沟工艺在运行,挖掘其脱氮除磷潜力,不失为污水厂节能降耗的一个方向。[Purposes]Taking an urban sewage plant as an example,this paper discusses the feasibility of excavating the potential of oxidation ditch process in low carbon source urban sewage plant,which pro-vides a direction for the transformation of oxidation ditch process in other sewage plants in China.[Meth-ods]Firstly,the original oxidation ditch reflux door was closed and its steel concrete was reinforced.Two low-head and large-flow through-wall pumps were installed in the vertical direction of the reinforced re-flux door,which strongly promoted the reflux of nitrification liquid,so that the internal reflux ratio of the oxidation ditch reached 300%~400%.Secondly,an aeration disc was added at the two curved sections of the oxidation ditch to adjust the dissolved oxygen(DO)concentration in the oxidation ditch and the anoxic zone.Finally,the original single sludge was refluxed to the anaerobic tank,and the double sludge was refluxed to the anaerobic tank and the anoxic zone of the oxidation ditch.The sludge reflux ratio was increased to 100%~200%.[Findings]After the transformation,the effluent quality of TN and TP in the oxidation ditch was significantly improved,and the effluent concentration of TN was reduced from 25~30 mg/L before the transformation to 10~19 mg/L,and the nitrogen removal potential was released by 11%~22%.The effluent concentration of TP was reduced from 1~1.5 mg/L before the modification to 0.1~0.5 mg/L,and the phosphorus removal potential was released by 14%to 23%.[Conclusions]Through the adjustment of the oxidation ditch reflux gate,the aeration disk,the sludge reflux point and the reflux ratio,the potential of nitrogen and phosphorus removal of the oxidation ditch system is further explored and released.Since there is a large proportion of the oxidation ditch process in the large sewage treatment plants in operation,excavating its potential of nitrogen and phosphorus removal can be re-garded as a direction of energy saving and consumption reduction of sewage treatment plants.

关 键 词：低碳源污水 氧化沟 提标改造 脱氮除磷 

分 类 号：X703[环境科学与工程—环境工程]