煤气化废水溶解性有机物水质特征研究

煤气化废水中的溶解性有机物(DOM)决定着处理药剂和微生物生长等,直接影响废水处理工程效果,DOM的光谱表征可反映各组分在氧化、降解或吸附等方面的特性。在分析某煤气化生产尿素企业的废水产生节点基础上,采集脱酚氨后废水,采用树脂分离方法对气化废水中的DOM进行6组分(HoA、HoB、HoN、HiA、HiB、HiN)分离,通过紫外-可见光谱、三维荧光光谱等分析方法对其水质特征进行分析。结果表明:废水DOM中HoA、HoN组分占比高达43.21%和33.65%,废水中含有较多非饱和结构的芳香族化合物;脱酚后废水各组分的E300/E400数值都较低,为2.88~5.00,说明废水的腐植化程度很高,主要为难生化降解的苯环结构物质;三维荧光光谱分析表明煤气化废水DOM各组分的最强荧光响应区域对应的有机物质主要包括类腐植酸、类富里酸、类酪氨酸以及类色氨酸这四大类有机物,为控制和处理煤气化废水中有机污染物提供理论依据。

Dissovled organic matters characteristics in coal gasification waste water

The dissolved organic matters (DOM) in coal gasification waste water determined the treatment agent and microbial growth,meanwhile,the effects of waste water treatment project were directly influenced by them.The spectral characterization of DOM reflected the oxidation,degradation and absorption characteristics of all kinds of the components.Some waste water after removing phenol ammonia from one urea production enterprise which adopted coal gasification technology was analyzed.The HoA,HoB,HoN,HiA,HiB,HiN in the waste water were separated with resin separation method.The waste water characteristics were tested by ultraviolet-visible spectrum and three dimensional fluorescence spectrum.The experimental results showed that the proportion of HoA and HoN components in DOM were up to 43.21％ and 33.65％ respectively which meant there were many aromatic compounds with unsaturated structure in the waste water.The E300/E400 of 6 components in dephenolized waste water ranged from 2.88 to 5.00,the low value of E300/E400 showed the high humification degree of waste water and the main refractory organics with benzene ring structure.According to three dimensional fluorescence spectrum,the strongest fluorescence response region of 6 components in DOM mainly included 4 kinds of organics such as humic-like acid,fulviclike acid,tyrosine-like acid and tryptophan-like acid.All these analysis provided theoretical basis for controlling and treating the organic pollutants of the coal gasification waste water.