好氧颗粒污泥常温异位湿式储存及其物质迁移转化机理研究
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摘要
研究了好氧颗粒污泥(AGS)常温异位湿式储存过程中泥相与水相之间的物质迁移转化规律,为阐释AGS稳定性下降提供机理解释。储存过程为厌氧环境,AGS的颜色由淡黄色逐渐变黑,结构由致密逐渐变松散。通过扫描电子显微镜观察到,储存31d后颗粒表面皱缩,局部出现裂痕。AGS与水相之间存在明显的物质迁移转化过程,主要表现在兼氧菌、厌氧菌逐渐代替好氧菌,AGS的胞外聚合物(EPS)下降,不能支撑AGS的基本骨架,导致AGS的稳定性下降。
The law of material migration and transformation between the mud phase and water phase of aerobic granular sludge(AGS)during ex-situ wet storage of room temperature was studied,which provided a theoretical basis for explaining the mechanism of AGS stability decline.The environment was anaerobic during storage,leading to that color of the AGS turned black from light yellow,and that the structure changed from dense to loose.It was observed by scanning electron microscope(SEM)that the surface of the AGS was shrunk and there appeared local cracks after 31 dstorage.There existed significant material migration and transformation between two phases during storage.This was due to anaerobes and facultative anaerobes replaced aerobes,leading to extracellular polymeric substances(EPS)declined so as not to support AGS structure.Therefore,stability of AGS declined.
The law of material migration and transformation between the mud phase and water phase of aerobic granular sludge(AGS)during ex-situ wet storage of room temperature was studied,which provided a theoretical basis for explaining the mechanism of AGS stability decline.The environment was anaerobic during storage,leading to that color of the AGS turned black from light yellow,and that the structure changed from dense to loose.It was observed by scanning electron microscope(SEM)that the surface of the AGS was shrunk and there appeared local cracks after 31 dstorage.There existed significant material migration and transformation between two phases during storage.This was due to anaerobes and facultative anaerobes replaced aerobes,leading to extracellular polymeric substances(EPS)declined so as not to support AGS structure.Therefore,stability of AGS declined.
引文
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[3]姜宸,濮文虹,杨昌柱,等.连续流中好氧颗粒污泥处理氯化苄生产废水[J].水处理技术,2017,43(8):58-62.
[4]ZHU J R,WILDERER P A.Effect of extended idle conditions on structure and activity of granular activated sludge[J].Water Research,2003,37(9):2013-2018.
[5]SAJJAD M,KIM I S,KIM K S.Development of a novel process to mitigate membrane fouling in a continuous sludge system by seeding aerobic granules at pilot plant[J].Journal of Membrane Science,2016,497:90-98.
[6]PIJUAN M,WERNER U,YUAN Z.Reducing the startup time of aerobic granular sludge reactors through seeding floccular sludge with crushed aerobic granules[J].Water Research,2011,45(16):5075-5083.
[7]XU H C,HE P J,WANG G Z,et al.Enhanced storage stability of aerobic granules seeded with pellets[J].Bioresource Technology,2010,101(21):8031-8037.
[8]赵珏,程媛媛,宣鑫鹏,等.好氧颗粒污泥的常温湿式储存及恢复[J].化工进展,2018,37(1):381-388.
[9]ZENG P,ZHUANG W Q,TAY S T,et al.The influence of storage on the morphology and physiology of phthalic acid-degrading aerobic granules[J].Chemosphere,2007,69(11):1751-1757.
[10]王晓慧,刘永军,刘喆,等.用三维荧光和红外技术分析好氧颗粒污泥形成初期胞外聚合物的变化[J].环境化学,2016,35(1):125-132.
[11]OCHOA J C,COLPRIN J,PALACIOS B,et al.Active heterotrophic and autotrophic biomass distribution between fixed and suspended systems in a hybrid biological reactor[J].Water Science and Technology,2002,46(1/2):397-404.
[12]LU H,CHANDRAN K,STENSEL D.Microbial ecology of denitrification in biological wastewater treatment[J].Water Research,2014,64:237-254.
[13]杨丹,刘东方,杜丽琼,等.好氧颗粒污泥系统中溶解性微生物代谢产物的特征及主要组分[J].环境科学,2018,39(3):1325-1332.
[14]吕娟,陈银广,顾国维.好氧颗粒污泥在生物强化除磷中的应用[J].环境科学与技术,2006,29(7):106-108.
[15]潘杨,阮文权,黄勇,等.序批式活性污泥(SBR)转移工艺的除磷机制[J].环境化学,2015,34(7):1329-1334.
[16]张云霞,季民,李超,等.好氧颗粒污泥胞外聚合物(EPS)的生化性研究[J].环境科学,2008,29(11).
[17]GAO D W,YUAN X J,LIANG H.Reactivation performance of aerobic granules under different storage strategies[J].Water Research,2012,46(10):3315-3322.