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Resistance to salt stresses by aerobic granular sludge:sludge property and microbial community

Frontiers of Environmental Science & Engineering 2024年第8期18卷 107-116页

作者： Xiao Wu Hui Li Meili Wang Tianying Zhang Jiawei Li Yongdi Liu Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission School of Chemistry and EnvironmentSouthwest Minzu UniversityChengdu 610041China Institute for Environmental Pollution and Health School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China School of Life Sciences Southwest UniversityChongqing 400715China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental EngineeringEast China University of Science and TechnologyShanghai 200237China Institute of Qinghai-Tibetan Plateau Southwest Minzu UniversityChengdu 610041China

Saline wastewater is regarded as a challenge for wastewater treatment plants because high-salinity conditions negatively affect on traditional biological *** granular sludge(AGS)has gained attention as a promising technology for saline wastewater treatment because of its compact structure and the ability to withstand toxic ***,this study investigated the saltresistance performance,sludge properties and microbial community of AGS under low-salinity and high-salinity conditions,with the saline concentrations ranging from 0 to 50 g/*** results showed that AGS could withstand long-term saline stresses,and the maximum salinity reached 50 g/L within 113 *** salinities of 10,30,and 50 g/L,the chemical oxygen demand(COD)removal efficiencies were 90.3%,88.0%and 78.0%,*** also its maintained strength and aggregation at salinities of 10 and 30 g/*** of extracellular polymeric substances(EPS)by non-halophilic bacteria that enhanced sludge *** compact structure that ensured the microorganisms bioactivity helped to remove organic matters under salinities of 10 and 30 g/*** a salinity of 50 g/L,moderately halophilic bacteria,including Salinicola,Thioclava,Idiomarina and Albirhodobacter,prevailed in the *** dominant microbial communities shifted to moderately halophilic bacteria,which could maintain aerobic granular stabilization and remove organic matters under 50 g/L *** results in this study provide a further explanation for the long-term operation of AGS for treating saline wastewater at different *** is hoped that this work could bring some clues for the mystery of salt-resistance mechanisms.

关键词： aerobic granular sludge Long-term saline stresses Performance sludge property Microbial community

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Comparison of membrane fouling during short-term filtration of aerobic granular sludge and activated sludge

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Journal of Environmental Sciences 2007年第11期19卷 1281-1286页

作者： ZHOU Jun YANG Feng-lin MENG Fan-gang AN Peng WANG Di School of Environmental and Biological Science and Technology Dalian University of Technology Dalian 116024 China

aerobic granular sludge was cultivated adopting internal-circulate sequencing batch airlift reactor. The contradistinctive experiment about short-term membrane fouling between aerobic granular sludge system and activated sludge system were investigated. The membrane foulants was also characterized by Fourier transform infrared （FTIR） spectroscopy technique. The results showed that the aerobic granular sludge had excellent denitrification ability; the removal efficiency of TN could reach 90%. The aerobic granular sludge could alleviate membrane fouling effectively. The steady membrane flux of aerobic granular sludge was twice as much as that of activated sludge system. In addition, it was found that the aerobic granular sludge could result in severe membrane pore-blocking, however, the activated sludge could cause severe cake fouling. The major components of the foulants were identified as comprising of proteins and polysaccharide materials.

关键词： membrane bioreactor membrane fouling pore-blocking cake layer resistance aerobic granular sludge

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Effect of seed sludge on characteristics and microbial community of aerobic granular sludge

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Journal of Environmental Sciences 2010年第9期22卷 1312-1318页

作者： Zhiwei Song Yuejun Pan Kun Zhang Nanqi Ren Aijie Wang School of Resource and Environmental Engineering Heilongjiang Institute of Science and Technology Harbin 150027 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150001 China

aerobic granular sludge was cultivated by using different kinds of seed sludge in sequencing batch airlift reactor. The influence of seed sludge on physical and chemical properties of granular sludge was studied; the microbial community structure was probed by using scanning electron microscope and polymerase chain reaction-denaturing gradient gel electrophoresis （PCR-DGGE）. The results showed that seed sludge played an important role on the formation of aerobic granules. Seed sludge taken from beer wastewater treatment plant （inoculum A） was more suitable for cultivating aerobic granules than that of sludge from municipal wastewater treatment plant （inoculurn B）. Cultivated with inoculum A, large amount of mature granules formed after 35 days operation, its SVI reached 32.75 mL/g, and SOUR of granular sludge was beyond 1.10 mg/（***）. By contrast, it needed 56 days obtaining mature granules using inoculum B. DGGE profiles indicated that the dominant microbial species in mature granules were 18 and 11 OTU when inoculum A and B were respectively employed as seed sludge. The sequencing results suggested that dominant species in mature granules cultivated by inoculum A were Paracoccus sp., Devosia hwasunensi, Pseudoxanthomonas sp., while the dominant species were Lactococcus raffinolactis and Pseudomonas sp. in granules developed from inoculum B.

关键词： aerobic granular sludge seed sludge microbial community PCR-DGGE

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Community analysis of ammonia and nitrite oxidizers in start-up of aerobic granular sludge reactor

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Journal of Environmental Sciences 2007年第8期19卷 996-1002页

作者： WANG Feng XIA Si-qing LIU Yi CHEN Xue-song ZHANG Jun State Key Laboratory of PoUution Control and Resource Reuse School of Environmental Science and Engineering Tongji University Shanghai 200092 China. College of Biology and Environment Engineering Zhejiang Shuren University Hangzhou 310015 China Medical School Tongji University Shanghai 200092 China

A lab-scale sequencing batch reactor （SBR） was set-up and the aerobic granular sludge was successfully incubated using anaerobic granular sludge as seed sludge. Nitrogen was partially removed by simultaneous nitrification and denitrification （SND） via nitrite with free ammonia （FA） of about 10 mg/L. The denaturing gradient gel electrophoresis （DGGE） method was used to investigate community structure of α-Proteobacteria, β-Proteobacteria, ammonia oxidizing bacteria （AOB）, and Nitrospira populations during start-up. The population sizes of bacteria, AOB and Nitrospira were examined using real-time PCR method. The analysis of community structure and Shannon index showed that stable structure of AOB population was obtained at day 35, while the communities of α- Proteobacteria, β-Proteobacteria, and Nitrospira became stable after day 45. At stable stage, the average cell densities were 1.1× 10^12, 2.2×10^10 and 1.0×10^10 cells/L for bacteria, AOB and Nitrospira, respectively. The relationship between characteristics of nitrifying bacteria community and nitrogenous substrate utilization constant was discussed by calculating Pearson correlation. Certain correlation seemed to exist between population size, biodiversity, and degradation constant. And the influence of population size might be greater than that of biodiversity.

关键词： aerobic granular sludge simultaneous nitrification and denitrification nitrite accumulation denaturing gradient gel electrophoresis real-time PCR

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Biodegradation of aniline by Candida tropicalis AN1 isolated from aerobic granular sludge

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Journal of Environmental Sciences 2011年第12期23卷 2063-2068页

作者： Dianzhan Wang Guanyu Zheng Shimei Wang Dewei Zhang Lixiang Zhou Department of Environmental Engineering College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 China Department of Biology Hong Kong Baptist University Hong Kong 999077 China

Aniline-degrading microbes were cultivated and acclimated with the initial activated sludge collected from a chemical wastewater treatment plant. During the acclimation processes, aerobic granular sludge being able to effectively degrade aniline was successfully formed, from which a preponderant bacterial strain was isolated and named as AN1. Effects of factors including pH, temperature, and second carbon/nitrogen source on the biodegradation of aniline were investigated. Results showed that the optimal conditions for the biodegradation of aniline by the strain AN1 were at pH 7.0 and 28–35°C. At the optimal pH and temperature, the biodegradation rate of aniline could reach as high as 17.8 mg/（L·hr） when the initial aniline concentration was 400 mg/L. Further studies revealed that the addition of 1 g/L glucose or ammonium chloride as a second carbon or nitrogen source could slightly enhance the biodegradation efficiency from 93.0% to 95.1%–98.5%. However, even more addition of glucose or ammonium could not further enhance the biodegradation process but delayed the biodegradation of aniline by the strain AN1. Based on morphological and physiological characteristics as well as the phylogenetic analysis of 26S rDNA sequences, the strain AN1 was identified as Candida tropicalis.

关键词： aniline aerobic granular sludge biodegradation Candida tropicalis AN1

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Analysis of aerobic granular sludge formation based on grey system theory

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Journal of Environmental Sciences 2013年第4期25卷 710-716页

作者： Cuiya Zhang Hanmin Zhang Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and TechnologyDalian University of Technology

Based on grey entropy analysis, the relational grade of operational parameters with aerobic granular sludge＇s granulation indicators was studied. The former consisted of settling time （ST）, aeration time （AT）, superficial gas velocity （SGV）, height/diameter （H/D） ratio and organic loading rates （OLR）, the latter included sludge volume index （SVI） and set-up time. The calculated result showed that for SVI and set-up time, the influence orders and the corresponding grey entropy relational grades （GERG） were： SGV （0.9935）〉 AT （0.9921）〉 OLR （0.9894）〉 ST （0.9876）〉 H/D （0.9857） and SGV （0.9928）〉 H/D （0.9914）〉 AT （0.9909）〉 OLR （0.9897）〉 ST （0.9878）. The chosen parameters were all key impact factors as each GERG was larger than 0.98. SGV played an important role in improving SVI transformation and facilitating the set-up process. The influence of ST on SVI and set-up time was relatively low due to its dual functions. SVI transformation and rapid set-up demanded different optimal I-I/D ratio scopes （10-20 and 16-20）. Meanwhile, different functions could be obtained through adjusting certain factors＇ scope.

关键词： aerobic granular sludge grey system theory operational impact factor granulation process

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Isolation and characterization of a strain with high microbial attachment in aerobic granular sludge

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Journal of Environmental Sciences 2021年第8期33卷 194-203页

作者： Tingting Zhao Kai Qiao Lei Wang Wei Zhang Wei Meng Fan Liu Xu Gao Jianrong Zhu School of Environment Beijing Normal UniversityBeijing 100875China State Key Laboratory of Water Simulation Beijing 100875China R&D Centre of aerobic Granule Technology Beijing 100875China

aerobic granule is a special microbial aggregate associated with biofilm *** formation of aerobic granular sludge is primarily depending on its bacterial community and relevant microbiological *** this experiment,a strain with high microbial attachment was isolated from aerobic granular sludge,and the detailed characteristics were *** high attachment ability could reach 2.34(OD600 nm),while other low attachment values were only around 0.06-0.32,which indicated a big variation among the different *** strain exhibited a very special morphology with many fibric fingers under SEM observation.A distinctive behaviour was to form a spherical particle by themselves,which would be very beneficial for the formation and development of granular *** EPS measurement showed that its PN content was higher than low attachment bacteria,and 3 DEEM confirmed that there were some different *** on the 16 S rRNA analysis,it was identified to mostly belong to *** augmentation to particle sludge cultivation demonstrated that the strain could significantly promote the formation of aerobic ***,it was strongly suggested that it might be used as a good and potential model strain or chassis organism for the aerobic granular sludge formation and development.

关键词： Bacterial isolates Microbial attachment aerobic granular sludge Biofilm 16S rRNA

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Molecular characterization of bacterial community in aerobic granular sludge stressed by pentachlorophenol

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Journal of Environmental Sciences 2008年第10期20卷 1243-1249页

作者： LIU, He LI, Guangwei LI, Xiufen CHEN, Jian Laboratory of Environmental Biotechnology School of Biotechnology Jiangnan University Wuxi 214122 China Key Laboratory of Industrial Biotechnology Ministry of Education of China Jiangnan University Wuxi 214122 China

To characterize the effects of pentachlorophenol (PCP) on the performance and microbial community of aerobic granular sludge in sequencing batch reactor (SBR), the web-based terminal restriction fragment length polymorphism (T-RFLP) and real-time PCR (RT- PCR) techniques were used to explore the bacterial community structure. When PCP increased from 0 to 50 mg/L, the COD removal rate changed little, while the ammonia removal rate dropped from 100% to 64.9%. The results of molecular characterization showed t...

关键词： aerobic granular sludge bacterial community real-time PCR terminal restriction fragment length polymorphism sequencing batch reactor pentachlorophenol (PCP)

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Re-activation characteristics of preserved aerobic granular sludge

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Journal of Environmental Sciences 2005年第4期17卷 655-658页

作者： ZHANGLi-li ZHANGBo HUANGYu-feng CAIWei-min CollogeofEnvironmentalScienceandEngineering ShanghaiJiaotongUniversityShanghai200240China.

In some industrial plants, wastewater was intermittently or seasonally generated. There may be periods during which wastewater treatment facilities have to be set into an idle phase over several weeks. When wastewater was generated again, the activated sludge flocs may have disintegrated. In this experiment, re-activation characteristics of aerobic granular sludge starved for 2 months were investigated. Specific oxygen utilization rate(SOUR) was used as an indicator to evaluate the metabolic activity of the sludge. The results revealed that aerobic granular sludge could be stored up to two months without running the risk of losing the integrity of the granules and metabolic potentials. The apparent color of aerobic granules stored at room temperature gradually turned from brownish-yellowish to gray brown. They appeared brownish-yellowish again 2 weeks after re-activation. The velocity and strength of granules after 2-month idle period could be fully restored about 3 weeks after re-activation. Metabolic activity, however, dropped to 15 8 mg O_2/(g MLVSS·h), i.e. 74 % reduction after 2 months of storage. After restarting the reactor, it took 2 weeks that SOUR of up to 48 5 mg O_2 /(g MLVSS·h) was achieved. A stable effluent COD concentration of less than 150 mg/L was achieved during the re-activation process.

关键词： aerobic granular sludge re-activation characteristics SBR specific oxygen consumption rate

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Cultivation of aerobic granular sludge in a conventional, continuous flow, completely mixed activated sludge system

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Frontiers of Environmental Science & Engineering 2015年第2期9卷 324-333页

作者： Xi CHEN Linjiang YUAN Wenjuan LU Yuyou LI Pei LIU Kun NIE School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology Xi'an 710055 China Department of Environmental Science Graduate School of Environmental Studies Tohoku University Sendai 980-8579 Japan

aerobic granules were formed in a conven- tional, continuous flow, completely mixed activated sludge system （CMAS）. The reactor was inoculated with seed sludge containing few filaments and fed with synthetic municipal wastewater. The settling time of the sludge and the average dissolved oxygen （DO） of the reactor were 2 h and 4.2 mg. L 1, respectively. The reactor was agitated by a stirrer, with a speed of 250r·min^-1, to ensure good mixing . The granular sludge had good settleability, and the sludge volume index （SVI） was between 50 and 90 mL ·g ^-1. The laser particle analyzer showed the diameter of the granules to be between 0.18 and 1.25 mm. A scanning electron microscope （SEM） investigation revealed the predominance of sphere-like and rod-like bacteria, and only few filaments grew in the granules. The microbial community structure of the granules was also analyzed by polymerase chain reaction-denaturing gradient gel electro- phoresis （PCR-DGGE）. Sequencing analysis indicated the dominant species were α, β, and γ-Proteobacteria, Bacteroidetes, and Firmicutes. The data from the study suggested that aerobic granules could form, if provided with sufficient number of filaments and high shear force. It was also observed that a high height-to-diameter ratio of the reactor and short settling time were not essential for the formation of aerobic granular sludge.

关键词： aerobic granular sludge completely mixed activated sludge system (CMAS) continuous flow shear force filamentous bacteria polymerase chain reaction- denaturing gradient gel electrophoresis (PCR-DGGE)

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