摘要
采用人工快速渗滤(CRI)系统对氧化沟出水进行深度处理试验研究,在水力负荷为2.0 m/d、水力负荷周期为24 h、湿干比为1:1条件下运行2个多月后出水稳定,系统对COD(化学需氧量),NH_(4)^(+)-N,TN(总氮),TP(总磷)的平均去除率分别为46.30%,73.89%,55.94%,94.24%.在不同湿干比(1:1,1:2,1:3)、不同水力负荷(1.5,2.0,2.5 m/d)和不同水力负荷周期(8,12,24 h)下进行正交试验,结果表明:CRI系统在水力负荷为2.0 m/d,湿干比为1:3,水力负荷周期为8 h时处理效果最好,为最优运行参数.对试验前后的海绵铁填料进行XRD(X射线衍射)、XRF(X射线荧光)和XPS(X射线光电子能谱)的材料表征,结果表明:海绵铁缓释的Fe^(3+)与水中PO_(4)^(3-)结合,并在填料表面形成沉淀,是CRI系统具有良好除磷效果的主要原因.
The constructed rapid infiltration(CRI) system was established for advanced treatment of the oxidation ditch effluent under the operational condition of a hydraulic load of 2.0 m/d,a hydraulic retention time(HRT) of 24 h,and a wet-to-dry ratio of 1:1,and the effluent of the CRI system reached stability after over two-month operation.The average removal rates of chemical oxygen demand,ammonia nitrogen,total nitrogen and total phosphorus were 46.30%,73.89%,55.94%,and 94.24%,respectively.Moreover,the orthogonal tests were carried out with different wet-to-dry ratios(1:1,1:2,1:3),different hydraulic loads(1.5,2.0,2.5 m/d),and different HRTs(8,12,24 h).Results show that the CRI system has a better removal performance with the hydraulic load of 2 m/d,the wet-dry ratio of 1:3,and the HRT of 8 h,indicating it could be the optimal operational parameters.In addition,the sponge iron fillers were characterized by X-ray diffraction,X-ray fluorescence,and X-ray photoelectron spectroscopy before and after the test,the results show that the slow-release Fe^(3+) in sponge iron combines with PO_(4)^(3-) in water and forms precipitation on the surface of the filler,which is the main reason for the good phosphorus removal effect of the CRI system.
作者
陆谢娟
余屿锋
陶铭
杨帆
LU Xiejuan;YU Yufeng;TAO Ming;YANG Fan(School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;China Construction Third Bureau Green Industry Investment Co.Ltd.,Wuhan 430058,China)
出处
《华中科技大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2022年第10期115-122,共8页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家重点研发计划资助项目(2016YFC0400704).
关键词
人工快速渗滤
海绵铁
运行参数优化
极差分析
除磷机理
constructed rapid infiltration
sponge iron
operational parameter optimization
range analysis
phosphorus removal mechanism