移动床生物膜技术处理校园污水过程中DOM的光谱特征  

Spectral Characteristics of Dissolved Organic Matter in Moving Bed Bio-Film Reactor Process for Treating Campus Sewage

作　　者：周明罗 陈海焱[1,3] 谌书[1,3] 王彬[1,3] 周日宇 郑睿 ZHOU Ming-luo;CHEN Hai-yan;CHEN Shu;WANG Bin;ZHOU Ri-yu;ZHENG Rui(School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China;College of Resource and Environmental Engineering,Yibin University,Yibin 644007,China;National Research Center for Municipal Wastewater Treatment and Reuse,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010 [2]宜宾学院资源与环境工程学院,四川宜宾644007 [3]西南科技大学国家城市污水处理及资源化工程技术研究中心,四川绵阳621010

出　　处：《光谱学与光谱分析》2019年第7期2160-2165,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41403081);四川省科技厅国际合作项目(2016HH0086);四川省科技重点研发项目(2017SZ0178);四川省教育厅重点项目(18ZA0500)资助

摘　　要：研究了厌氧-缺氧-好氧移动床生物膜(MBBR)工艺对校园污水的处理效果,采用三维荧光光谱和紫外光谱分析了污水处理过程中溶解性有机物(DOM)的降解特性及其组成特征。结果表明,MBBR对校园污水具有较好的去除效果,COD,NH3-N,TN,TP和DOC的去除率分别达到83.0%,70.9%,52.4%,59.2%和62.2%。三维荧光光谱显示有3个明显的特征荧光峰,其中心位置分别在Ex/Em=230nm/325nm(T峰)、Ex/Em=280nm/350nm(S峰)、Ex/Em=350nm/440nm(R峰)附近,污水中荧光类溶解性有机物主要包括类色氨酸(Trp)、类溶解性微生物代谢产物(SMP)和类腐殖酸(HA)。DOM特征荧光峰的中心位置及荧光强度随处理流程而变,说明污水中DOM的组成和相对含量经MBBR处理后发生变化。其中,类色氨酸、类溶解性微生物代谢产物荧光特征峰近乎消失,表明MBBR对这两类有机物质去除效果显著;溶解性微生物代谢产物荧光强度在厌氧池、缺氧池、好氧池分别为进水的37.1%,20.3%,13.1%,表明MBBR的各生化阶段,微生物均能很好的降解SMP;但类腐殖酸(R峰)荧光强度降低较小,微生物对类腐殖酸总的去除效果不明显。在MBBR工艺流程中,DOM腐殖化指数HIX、荧光指数FI、生物源指数BIX均逐渐增大,微生物对有机污染物降解起到了关键作用。其中,HIX值在缺氧池、好氧池、出水中增大到4以上,经MBBR处理后,DOM腐殖化程度和成熟度逐渐增加;缺氧池、好氧池及出水的荧光FI值接近1.9(分别为1.899,1.881,1.887),说明其中类腐殖质有机物主要源于微生物代谢活动;缺氧池、好氧池及出水中DOM的BIX值约为1.0(依次为0.985,1.018,0.979),说明缺氧池、好氧池及出水中DOM也主要源于微生物代谢或死亡。污水的紫外特征值E250/E365随工艺流程逐渐减小、SUVA254不断增大,表明经MBBR处理后,污水中DOM类型和含量均发生了较大变化,有机物的共轭不饱和双键或芳香性基团增多,聚合度、腐殖化程度、�The anaerobic-anoxic-oxic moving bed bio-film reactor(MBBR) process was used to treat campus sewage, and the removal efficiencies of main pollutants were studied in this paper. The composition and transformation of dissolved organic matter(DOM) in wastewater were analyzed with three-dimensional fluorescence spectra and ultraviolet spectroscopy. The results showed that the MBBR process had good purification effect on contaminants. The removal rate of COD, NH3-N, TN, TP and DOC had reached 83.0%, 70.9%, 52.4%, 59.2% and 62.2%, respectively. Moreover, there were three dominant peaks in the three-dimensional fluorescence spectrogram, and their central locations were near Ex/Em=230/325 nm(peak T), Ex/Em=280/350 nm(peak S) and Ex/Em=350/440 nm(peak R), respectively. The main fluorescent material in sewage included tryptophan(Trp), soluble microbial products(SMP) and humic acid(HA). The central position and fluorescence intensity of the peaks had changed along the MBBR process, indicating that the composition and concentration of DOM vary with the treatment process. The peaks of Trp and SMP almost disappeared after treatment, which revealed that MBBR process has remarkable effect on the removal of proteinoid. Meanwhile the fluorescence intensity of SMP in anaerobic tank, anoxic tank and oxic tank decreased to 37.1%, 20.3% and 13.1%, respectively, showing that the microorganism can well decompose SMP in each biochemical stage of the MBBR process. However, the fluorescence intensity of HA decreased slightly, and the process seemed to be ineffective on removing of humic acid. In addition, the vales of HIX, FI and BIX had gradually increased and the metabolism of microorganisms played an important role in the degradation of contaminants in the MBBR process. The humification and maturity of DOM had gradually enhanced with HIX during MBBR process. The FI values of wastewater from anoxic tank, oxic tank and effluent were about 1.9(1.899, 1.881, 1.887, respectively), implying that the humus organic compounds in sewage were main

关 键 词：溶解性有机物 移动床生物膜 三维荧光 紫外光谱 校园污水 

分 类 号：O657.3[理学—分析化学]