摘要
以焦化废水为例,采用连续过滤及化学分析的方法考察了悬浮组分、胶体组分及溶解组分对生物出水残余COD的贡献,并结合紫外-可见光谱和GC/MS图谱定性解析各形态组分的有机构成特征,构建了一种废水生物出水COD构成解析的评价方法.实验结果显示,焦化废水生物处理出水中悬浮态和胶体态组分对残余COD的贡献分别占COD总量的25.9%—46.3%和18.7%—44.4%,建议优先考虑采用混凝沉淀工艺去除约35.0%—45.0%的COD,使处理出水基本能够达标排放;溶解组分的COD占COD总量的24.6%—40.7%,其中4.3%—15.8%的COD由硫化物、硫氰化物等还原性物质贡献,其余部分主要由链状烃类、酯类及醇类等溶解有机组分贡献,建议采用氧化或吸附工艺进行处理,以满足更高的出水水质要求.
The contribution of the suspended substance,colloid and dissolved components to residual COD value in the biological effluent of coking wastewater was investigated by the methods of sequential filtration and chemical analysis.The UV-vis spectrum and GC/MS measurements were used to analyze the properties of organic compounds,aiming to establish an evaluation method for the analysis of COD composition in wastewater treatment.The results showed that the major contributions to residual COD values were suspended substance and colloid,and the ratio was 25.9%—46.3% and 18.7%—44.4%,respectively.It was indicated that about 35%—45% of the total COD from suspended and colloid components were removed by coagulation.The COD of dissolved components was 24.6%—40.7% of the total COD,and therein 4.3%—15.8% of the total COD was contributed by the reducing inorganic such as sulphide and thiocyanide.The remaining COD was contributed by chain alcohols,hydrocarbons,esters and other dissolved organic matters.Oxidation and adsorption are the suggested methods for decreasing the COD of the dissolved components in order to satisfy the higher standards.The results also provide an important theory basis for the selection of advanced treatment technologies for coking wastewater.
出处
《环境化学》
CAS
CSCD
北大核心
2012年第10期1494-1501,共8页
Environmental Chemistry
基金
国家自然科学基金重点项目(21037001)
"十一五"国家科技支撑计划重点项目(2008BAC32B06-1)
国家高技术研究发展计划项目(2009AA06Z319)
华南理工大学中央高校基本科研业务经费(2011ZP0006)资助
关键词
残留COD
COD组分
胶体组分
还原性无机组分
residual COD
COD fractionations
colloid components
reducing inorganic components
