摘要
对自制涂铁砂进行过滤和反冲洗试验,研究不同滤层(每层为12 cm)的截污性能,并与原始石英砂和活性炭-涂铁砂组合滤料的性能进行对比研究,探讨涂铁砂对浊度和有机物的过滤效果及其再生能力。结果表明,(1)涂铁砂存在一个使用成熟期,约3个工作周期。成熟期后,其对浊度和有机物的去除率最高,为96.5%、75.4%。(2)涂铁砂对浊度的有效截污滤层集中在前2层,总去除率为88.73%。(3)经相同强度气水反冲洗后,涂铁砂滤层厚增加幅度最大(为5 cm),过滤周期为石英砂的1.5倍。(4)改进后的气水反冲洗强度为:气冲4 min,q气=12L.m-.2s-1;气水同时冲5 min,q气=12 L.m-.2s-1,qNaOH=10 L.m-2.s-1,NaOH=0.1 mol.L-1;清水漂洗3 min,q水=10 L.m-2.s-1。(5)反冲洗后,活性炭-涂铁砂组合滤料中涂铁砂表面的块状及针状形态学特征不变,对有机物的去除效果保持不变,为74.1%。
Do filtration and backwash test for homemade iron oxide coated sand filter （the following was referred to as iron-coated sand）, studying the interception performance of different filter layers （each layer＇s thickness was 12 cm）,and do comparative study with the original quartz sand and activated carbon - iron-coated sand combined filter＇s performance, discussing the effect iron-coated sand on turbidity and organic matter and its regeneration ability. The results showed that：（1）There existed a use maturity period of iron-coated sand,which was about 3 working cycles. After maturity, the removal rate of turbidity a0d organic matter were highest,which could reach 96.5% 75.4% ,respectively. （2）the effective pollutant filter layer of Iron-coated sand concentrated in the former two,the total removal rate was 88.73%. （3）After the same intensity of air-water backwashing,the thickness of sand filter layer got the maximum amplitude （5 cm） and its filtration cycle was 1.5 times more than quartz sand.（4）The improved intensity of air water backwashing： air impact 4 min, q ~ = 12 L. m-2. sl; simultaneous air and water drawing 5 min, q气 = 12 L·m-2·s-1, qNaOH= 10L·m-2·s-1, NaOH=0.1 mol. L-1; Water rinse 3 min, q水 =10 L·m-2·s-1. After backwashing, the block and acicular morphology on the surface of iron-coated sand was unchanged for activated carbon - iron- coated sand combined filter ,and the removal effect of organics remained unchanged which was74. 1%.
出处
《水处理技术》
CAS
CSCD
北大核心
2012年第3期103-106,110,共5页
Technology of Water Treatment
基金
国家自然科学基金(51108094)
粤港关键领域重点突破项目(2010Z524)
广东省科技计划项目(2010B030900001)
关键词
涂铁砂
活性炭-涂铁砂
有机物
使用成熟期
过滤性能
反冲洗
去除率
形态学特性
iron-coated sand
activated carbon-iron-coated sand combined filter
organic matter
use of maturity
filter performance
backwash
morphological properties
