印染废水处理厂排水中有机物的荧光方法表征
Characterization of Organic Matters in the Effluent of Dyeing and Printing Wastewater Treatment Plants with Fluorescence Method
摘要 我国苏南地区印染企业众多,废水排放量巨大,加强印染废水的处理排放管理势在必行.三维荧光光谱测量快速、灵敏,能够反映水中有机物组成,可以弥补化学需氧量等传统有机物指标评价水质的不足.采集了我国苏南某市5家运行良好、达标排放的印染废水处理厂的排水,进行了总有机碳、UV254和三维荧光光谱的测定,来表征其中的溶解性有机物.5家污水处理厂排水的单位总有机碳的UV254为1.42~4.29 L·mg-1·m-1,表明其有机物芳香化水平与城市污水处理排水接近.各个污水处理厂印染废水处理排水的三维荧光光谱有所差别,但主要都有两个荧光峰,其激发波长和发射波长分别位于230/340和275/320 nm处,校正归一化后的荧光强度远高于城市污水处理排水,而腐殖化指数远低于城市污水处理排水,表明印染废水处理排水相比城市污水处理排水存在较大比例的非腐殖类芳香族化合物.通过测定周边印染企业常用染料的三维荧光光谱可以推测印染废水处理排水的荧光信号可能来自于残留的染料及其未完全降解的中间产物,可能会对水环境造成一定的危害.研究显示三维荧光光谱在显示水体有机物污染组成上具有一定优势.
Abstract:
In southern Jiangsu,it's imperative to reinforce management of the textile wastewater treatment and discharge due to a large amount of textile wastewater generated by thousands of dyeing and printing enterprises.Compared with traditional inde-xes of organic pollution such as chemical oxygen demand and biochemical oxygen demand,fluorescence excitation-emission ma-trix,which has an advantage of fast measure and high sensitivity,could exhibit organic composition in water/wastewater.In this study,the effluents reaching the discharge standards from five different dyeing and printing wastewater treatment plants in southern Jiangsu were collected.TOC,UV254 and fluorescence excitation-emission matrix were used to characterize dissolved organic matters in the treated textile effluents.The results showed that the effluents with UVA254 by TOC ranging from 1.42 to 4.29 L·mg-1 ·m-1 had a similar aromaticity with the effluents from the sewage treatment plants.Despite of some visional differences between excitation emission matrixes of all effluent samples,there were two major peaks locating at the excitation/emission wavelength of around 230/340 and 275/320 nm.The fluorescence intensity of the treated textile effluents after Raman calibration was much higher than that of treated municipal wastewater while that of humification index was much smaller,which indicated that non-humic aromatic compounds accounted for a much larger proportion in treated textile effluent than treated mu-nicipal wastewater.Some commonly used dyes were collected from dyeing and printing enterprises and their fluorescence excita-tion-emission matrix was measured.Thus,the strong fluorescence signals of treated textile effluents could be derived from the residual dyes and their incomplete degradation products.This indicated that the effluents of the dyeing and printing wastewater treatment plants might have some negative environmental impact although it reached the discharge standards.Fluorescence exci-tation-emission matrix could be a promising tool to exhibit the organic components in water.
Author: HUANG Zhen-rong CHENG Cheng TANG Jiu-kai Lü Wei-ming TAO Ting-ting WANG Xiao-jiong WU Jing
作者单位: 江阴市环境监测站,江苏 江阴,214400 清华大学环境模拟与污染控制国家重点联合实验室,北京,100084
刊 名 光谱学与光谱分析 ISTICEISCIPKU
年,卷(期): 2017, 37(10)
分类号: X832
在线出版日期: 2017年11月3日
基金项目: 国家水体污染控制与治理科技重大专项项目,国家自然科学基金项目,清华大学自主科研项目,环境模拟与污染控制国家重点联合实验室专项经费