研究报告
徐荣华,武恒平,贺润升,韦朝海.焦化废水中不同极性组分的光谱分析及可生物降解特性[J].环境科学学报,2016,36(3):900-906
焦化废水中不同极性组分的光谱分析及可生物降解特性
- Spectral analysis and biodegradation characteristics of different polar fractions in coking wastewater
- 基金项目：国家自然科学基金项目(No.51278199);广东省教育厅学科建设专项资金项目(No.2013CXZDA004)
- 作者
- 单位
- 徐荣华
- 华南理工大学环境与能源学院, 广州 510006
- 武恒平
- 华南理工大学环境与能源学院, 广州 510006
- 贺润升
- 中国科学院广州地球化学研究所, 广州 510640
- 韦朝海
- 1. 华南理工大学环境与能源学院, 广州 510006;2. 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 摘要：焦化废水是典型难降解工业有机废水,构成其成分的复杂及种类的繁多使其难以实现高效的生物降解过程,制约了水处理的水质达标.为了探明其中生物降解强抑制组分,采用DAX-8大孔树脂将焦化废水分离出疏水酸性组分(HOA)、疏水碱性组分(HOB)、疏水中性组分(HON)和亲水性组分(HIS)等4种极性不同的组分,分析了各组分的有机物含量分布,紫外吸收光谱和三维荧光光谱,并用两种方法考察了各组分的可生物降解性能.结果表明,HOA是主要的有机组分,其COD和TOC分别占比55.9%和56.8%;HOA也是主要的芳香物质及荧光组分,而HON是芳香构造化程度最高和类腐殖质占比P(Ⅲ+Ⅴ)最高的组分;各组分的BOD5/COD值及脱氢酶活性的抑制结果显示其难降解程度依次为HON> HOB> HIS> 原水> HOA,而HON是焦化废水中生物抑制最强组分,其BOD5/COD值仅为0.21±0.02,对脱氢酶活性的抑制达到38.5%;SUVA和P(Ⅲ+Ⅴ)与可生物降解性的关联分析发现,焦化废水中难降解组分并不都是芳香性化合物造成的,类腐殖质对其中难降解有机组分的指示作用相比SUVA更加灵敏.
- Abstract：Coking wastewater is a typical refractory industrial organic wastewater with complicated composition; efficient biodegradation of coking wastewater is hard to achieve, thus making its effluent hard to meet the discharge standard. In order to ascertain its refractory components, DAX-8 resin was applied to separate coking wastewater into four different polar fractions:hydrophobic acids (HOA), hydrophobic bases (HOB), hydrophobic neutrals (HON) and hydrophilic substances (HIS). Then the organic content distribution, UV absorption spectra, three-dimensional fluorescence excitation-emission matrix (3D EEMs) of each polar fractions were analyzed and their biodegradability was evaluated. The results showed that HOA was the main organic component, accounting for 55.9% and 56.8% of the total COD and TOC, respectively. HOA was also a major constituent of aromatic and fluorescent substances, but HON had the highest degree of aromatic structure and proportion of humic-like substances P(Ⅲ+Ⅴ). The BOD5/COD values and the dehydrogenase activity inhibition of different polar fractions showed that the order of refractory degree was HON> HOB> HIS> raw water> HOA. It was found that HON was the most refractory component for biodegradation inhibition in coking wastewater, whose BOD5/COD value was only 0.21±0.02 and the inhibition degree of dehydrogenase activity reached 38.5%. The correlations among SUVA, P(Ⅲ+Ⅴ) and biodegradability revealed that not all refractory substances in coking wastewater were aromatic compounds, while humic-like matter (Ⅲ+Ⅴ) was more sensitive to indicate refractory substances compared to SUVA.
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