组合工艺处理养猪废水DOM组成特征分析

Analysis of DOM Composition Characteristics of Swine Wastewater Treated by Combination Process

采用三维荧光技术分析组合工艺处理养猪废水过程中可溶性有机物(DOM)变化过程,以平行因子分析模型探究废水DOM组成。结果表明,经三维电化学+生物处理,出水中类酪氨酸和高激发波长色氨酸的荧光强度基本消失,类富里酸和类腐殖酸荧光显著下降。平行因子分析发现,废水DOM含有2个组分:组分1的主次峰(Ex/Em)为色氨酸(210 nm/360 nm)和可溶解性微生物产物(270 nm/360 nm),组分2的主次峰为类富里酸(230 nm/425 nm)和类腐殖酸(300 nm/425 nm)。出水中也有2个组分:组分1(240 nm,320 nm/405 nm)和组分2(240 nm,340 nm/470 nm),两组分都只与类富里酸和类腐殖酸有关,但相对于进水发生了明显红移。对比分析可知,该组合工艺降解色氨酸物质和可溶解性微生物产物效果显著,而在降解类富里酸和类腐殖酸过程中会产生具有高聚合度的复杂结构,这是出水COD仍较高的原因,提示后续降解宜采用高级氧化工艺。

Three-dimensional fluorescence technique was used to analyze the process of DOM change of soluble organic matter in the treatment of swine wastewater by combined process,and the DOM composition of wastewater was investigated by parallel factor analysis model.The results showed that the fluorescence intensity of tyrosine and high excitation wavelength tryptophan in the effluent was basically disappeared by three-dimensional electrochemical+biological treatment,and the fluorescence of the acid and humic acids decreased significantly.Parallel factor analysis found that the wastewater DOM contained 2 components:the primary and secondary peaks of component 1(Ex/Em)were tryptophan(210 nm/360 nm)andsoluble microbial products(270 nm/360 nm),and the primary and secondary peaks of component 2 were acid(230 nm/425 nm)and humic acid(300 nm/425 nm).There are also two components in the effluent:component 1(240 nm,320 nm/405 nm)and component 2(240 nm,340 nm/470 nm),both of which are related only to acid and humic acids,but there is a significant red shift relative to the inlet.The comparison and analysis show that the combination process degrades tryptophan and soluble microbial products significantly,while degrades rich acid and humic acids in the process of producing a complex structure with high polymerization degree,which is the reason why the COD is still high,suggesting that the subsequent degradation should adopt advanced oxidation process.