摘要
采用Fenton法对难降解的类长填龄渗滤液进行处理,考察其氧化和絮凝作用对有机物去除的贡献.结果表明:以CODCr去除率最大为目标,试验在最优条件下,c(H2O2)/c(Fe2+)为7.0,Fe2+投加量(c(Fe2+))为60 mmol/L,pH为3.0,此时CODCr总去除率为60%;其中氧化作用去除率为44%,氧化和絮凝作用的效率比为2.7.c(H2O2)/c(Fe2+),c(Fe2+)和pH的变化对氧化和絮凝作用有明显影响,氧化作用对CODCr去除率随H2O2投加量增大而增大.絮凝作用对CODCr的去除率不仅受Fe2+投加量直接影响,随其增加而增大;还间接受氧化作用去除率影响,氧化作用去除率越大,剩余有机物大分子所占比例降低,絮凝作用对有机物的去除率越低.
Fenton method was applied in the treatment of non-degradable mature landfill leachate. The indicator of CODcr was used to determine the roles of oxidation and coagulation in reducing the refractory organics of mature leachate. The results showed that, with the purpose of achieving maximum CODcr removal rate, under the optimal condition of c（H2O2 ）/c（Fe^2＋ ） = 7.0, c（Fe^2＋ ） = 60 mmol/L and pH =3.0, 60% of total CODcr was removed, of which 44% was removed by free radical oxidation, and the ratio of CODcr removal by oxidation to coagulation was 2.7. The changes in action conditions （c （H2O2 ）[c （Fe^2＋ ）, c （Fe^2＋ ） and pH） have significant effects on the relationship of oxidation and coagulation. The efficiencies of CODcr removal by oxidation increases by increasing the dosages of H2O2 . Meanwhile, not only were the efficiencies of CODcr removal by coagulation influenced directly by ferrous dosages, which increased by adding the ferrous dosage, but also they could be influenced by oxidation efficiencies indirectly. The high oxidation efficiency means high fraction of low molecular weight organics residual in the water, resulting in the decrease of CODcr removal efficiency by coagulation.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2008年第4期20-24,共5页
Research of Environmental Sciences
基金
国家自然科学基金项目(50578115,50538080)
国家科技支撑计划课题(2006BAJ04A06)
