摘要
对处理西北黄土塬地区集雨水砂滤工艺的石英砂滤料进行了改性试验,同时进行了滤速的选定试验。通过改性滤料对COD_(Cr)的去除率确定改性剂(三氯化铁)的最佳浓度、改性滤料在烘箱中被搅拌的最佳次数、最佳焙烧温度及最佳焙烧时间,确定了最佳改性条件下表面覆膜物质含量及氧化膜的附着强度。试验结果表明:改性剂浓度为2 mol/L,无搅拌,焙烧温度为550℃,焙烧时间为3 h时,所得到的改性滤料对集雨水COD_(Cr)的去除效果最好;最佳改性条件下表面覆膜物质的含量为2.14mg/g,其在酸性和机械震荡条件下的脱附率分别为0.551%、0.119%。在砂滤滤速的选定试验中,通过对不同滤速下,出水的浊度和总产水量分析,选定了最佳滤速为6 m/h。
Experiment on quartz sand modification and filtration rate selection for removing the contaminant from rain water in northwest loess tableland area was carried out. The optimal concentration, stirring number calcinations temperature and time of the modifier （ FeCU ） were determined by C0D＆ removing rate. Concentration and adhesion strength of the material covering quartz sand were measured under the optimal modification conditions. Results turned out that the optimal modification concentration was 2 mol/L, no stirring, calcinations temperature was 550 丈,and calcinations time was 3 h. The content of surface coating material was 2.14 mg/g,and desorption rates were 0.551% and 0.119% under the condition of acid and mechanical shock. The optimal filtration rate was determined to be 6 m/h,through the analysis of effluent turbidity and periodic total water quantity by different filtration rate.
作者
杨晓妮
杨浩
Yang Xiaoni;Yang Hao(College of Resources and Environment,Gansu Agricultural University,Lanzhou 730070, China;College of Environment and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《净水技术》
CAS
2017年第11期50-54,共5页
Water Purification Technology
基金
城市雨水系统与水环境省部共建教育部重点实验室研究基金
关键词
砂滤
雨水
改性条件
滤速
西北黄土塬地区
sand filtration rain water modification condition filtration rate northwest loess tableland area
