废水处理生物出水中COD构成的解析——以焦化废水为例  

Analysis of COD composition in biological effluent:an example from coking wastewater treatment

作　　者：曹臣[1] 韦朝海[1] 杨清玉[1] 吴超飞[1] 吴海珍[2] 胡芸[1] 任源[1] 卢彬 

机构地区：[1]华南理工大学环境科学与工程学院工业聚集区污染控制与生态修复教育部重点实验室污染控制与生态修复广东省普通高等学校重点实验室,广州510006 [2]华南理工大学生物科学与工程学院,广州510006 [3]广州境天环保科技有限公司,广州510640

出　　处：《环境化学》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

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.

关 键 词：残留COD COD组分 胶体组分 还原性无机组分 

分 类 号：X784[环境科学与工程—环境工程]