摘要
采用自制一体式膜生物反应器(MBR)深度处理垃圾渗滤液(COD 800-1300 mg•L^(-1)、氨氮40-80 mg•L^(-1)),考察了MBR启动及优化条件下连续运行状况。结果表明,启动11 d后COD、氨氮去除率分别达到63.65%、81.78%;在HRT为24 h、DO为3-4 mg•L^(-1)的最优条件下运行28 d,COD、氨氮去除率分别达到80%以上、90%以上,但跨膜压差从20.3 kPa增至46.8 kPa,表明膜污染产生且逐渐加剧;傅立叶变换红外光谱分析表明,膜面污染物与污泥的有机官能团相似;荧光光谱分析表明,膜面污染物主要为多糖类、类色氨酸蛋白质、类富里酸和类腐殖酸;对比分析MBR稳定运行15 d和28 d时的胞外聚合物和溶解性微生物产物的特征荧光峰,发现膜面污染物的特征荧光峰与胞外聚合物、溶解性微生物产物的荧光峰相似,且与胞外聚合物的相似性更高,说明胞外聚合物为膜污染的主要来源,溶解性微生物产物为膜污染的次要来源,因此MBR长期稳定运行需重点关注胞外聚合物的控制。
We deeply treated landfill leachate with COD of 800-1300 mg•L^(-1) and the ammonia nitrogen of 40-80 mg•L^(-1) by using the self-made integrated membrane bioreactor(MBR),and investigated the continuous operation status of MBR under the startup and optimized conditions.The results show that the removal rates of COD and ammonia nitrogen reach 63.65%and 81.78%,respectively after startup for 11 d.Under optimized conditions that the HRT is 24 h and DO is 3-4 mg•L^(-1),the removal rates of COD and ammonia nitrogen can reach up to 80%and 90%,respectively,after operation for 28 d,however,the transmembrane pressure gradually increases from 20.3 kPa to 46.8 kPa,indicating that membrane pollution has occurred and is gradually increasing.Fourier transform infrared spectroscopy(FTIR)analyses show that the membrane surface pollutants are similar to the organic functional groups of sludge.The fluorescence spectroscopy analyses indicate that the membrane surface pollutants are mainly polysaccharides,tryptophan-like proteins,fulvic acid-like,and humic acid-like.After comparing the characteristic fluorescence peaks of extracellular polymeric substance(EPS)and soluble microbial product(SMP)after operation for 15 d and 28 d,it is found that the characteristic fluorescence peaks of the membrane surface pollutants are similar to those of EPS and SMP,and they are more similar to the fluorescence peaks of EPS.The study shows EPS is the main source of membrane pollution,followed by SMP,indicating that the control of EPS should be focused on the long-term stable operation of MBR.
作者
李道文
杨宇航
丁鑫末
LI Daowen;YANG Yuhang;DING Xinmo(Jingzhou Municipal Ecological Environment Bureau,Jingzhou 434000,China;School of Chemical Engineering,Yangtze University,Jingzhou 434023,China)
出处
《化学与生物工程》
CAS
2023年第10期39-44,共6页
Chemistry & Bioengineering
基金
国家自然科学基金项目(21173026)
湖北省自然科学基金重点项目(2013CFA107)
荆州市科技项目(019EC61-14)。
关键词
膜生物反应器
膜污染
傅立叶变换红外光谱
荧光光谱
膜面污染物
胞外聚合物
溶解性微生物产物
membrane bioreactor(MBR)
membrane pollution
Fourier transform infrared spectroscopy
fluorescence spectroscopy
membrane surface pollutant
extracellular polymeric substance
soluble microbial product
