摘要
针对硅钢钝化液废水利用NaHSO3处理Cr^6+、CODCr超标的难题,改用FeSO4和H2O2为处理剂,利用Fe^2+的还原性和在酸性条件下Fe^2+与H2O2形成Fenton试剂的催化氧化特性,对废水中的Cr^6+和CODCr进行同步去除。FeSO4/H2O2处理硅钢钝化液废水适宜参数为:n(Fe^2+):n(H2O2)=1:2、Fe^2+投加量n(Fe^2+):n(Cr^6+)=5.2:1、pH值3~4、温度15~35℃。在此条件下,可使初始浓度为Cr^6+=2959mg/L、CODCr=1351mg/L的废水,处理后Cr^6+、CODCr分别降为0.421mg/L、25.6mg/L,去除率为99.99%和98.11%,达到了《钢铁工业水污染物排放标准》(GB13456—92)中的一级排放要求。
FeSO4and H2O2 were used to decrease CODCr in silicon steel passivating wastewater with the reducibility of Fe( Ⅱ ) and the catalysis-oxidation properties of Fenton reagent formed by Fe( Ⅱ ) and H2O2 in acidic medium, to avoid the problem met in NaHSO3 treatment with Cr^6+ ,CODcr exceeding the discharge standard. The appropriate parameters were as follows: n(Fe^2+) : n(H2O2)=1: 2, n(Fe^2+ ) : n(Cr^6+)=5.2 : 1, pH 3-4, temperature 15-35 ℃. Under these conditions, the removal rate of Cr(Ⅵ) and CODer was 99.99 % and 98. 11 % respectively, the Cr (Ⅵ)and CODCr of the influent reduced from 2 959 mg/L and 1 351 mg/L to 0. 421 mg/L and 25.6 mg/L respectively, and the effluent concentration achieved 1-class in "Steel Industrial Water Pollutant Discharge Standard(GB 13456-92) ".
出处
《钢铁》
CAS
CSCD
北大核心
2010年第11期90-93,共4页
Iron and Steel
基金
江苏省自然科学基金项目(SBK200930405)
国家“十一五”水重大专项项目(2008ZX07101-007-01)
关键词
硅钢废水
钝化液
含铬废水
FENTON试剂
silicon steel wastewater
passivation wastewater
chromium-containing wastewater
fenton reagent