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Microbial characteristics in anaerobic membrane bioreactor treating domestic sewage:Effects of HRT and process performance

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Journal of Environmental Sciences 2022年第1期34卷 392-399页

作者： Jialing Ni Jiayuan Ji yu-you li Kengo Kubota Department of Civil and Environmental Engineering Graduate School of EngineeringTohoku University6-6-06 AobaAramakiAoba-ku 980-8579SendaiJapan Department of Frontier Science for Advanced Environment Graduate School of Environmental StudiesTohoku University6-6-06 AobaAramakiAoba-ku 980-8579SendaiJapan

Two anaerobic membrane bioreactors(AnMBRs)equipped with different membrane pore size(0.4 or 0.05μm)were operated at 25℃and fed with domestic *** hydraulic retention time(HRT)of the reactors was *** microbial communities of the two AnMBRs were investigated by 16S rRNA gene amplicon sequencing to see the effects of *** predominant Archaea was an aceticlastic methanogen *** composition of hydrogenotrophic methanogens changed with the HRTs:the population of Methanobacterium was higher for longer HRTs,whereas the population of unclassified Methanoregulaceae was higher for shorter *** Anaerolineae,Bacteroidia and Clostridia bacteria were dominant in both of the reactors,with a combined relative abundance of over 55%.The relative abundance of Anaerolineae was proportional to the biogas production *** change in the population of hydrogenotrophic methanogens or Anaerolineae can be used as an indicator for process *** sum of the relative abundance of Anaerolineae and Clostridia fluctuated slightly with changes in the HRT in both AnMBRs when the reactor was stably *** co-occurrence analysis revealed the relative abundance of the operational taxonomic units belonging to Anaerolineae and Clostridia was functionally equivalent during the treatment of real domestic sewage.A principal coordination analysis revealed that the changes in the microbial community in each reactor were consistent with the change of *** addition,both the HRT and the stability of the process are important factors for maintaining microbial community structures.

关键词： Anaerobic membrane bioreactor Co-occurrence analysis Hydrogenotrophic methanogen HRT Microbial community structure Principal coordinate analysis

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The main anammox-based processes, the involved microbes and the novel process concept from the application perspective

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Frontiers of Environmental Science & Engineering 2022年第7期16卷 1-19页

作者： Yan Guo Zibin Luo Junhao Shen yu-you li Department of Environmental Engineering School of Energy and Environmental EngineeringUniversity of Science and Technology BeijingBeijing100083China Department of Civil and Environmental Engineering Graduate School of EngineeringTohoku UniversitySendaiMiyagi980-8579Japan Graduate School of Environmental Studies Tohoku UniversitySendaiMiyagi980-8579Japan

Anammox technology has been widely researched over the past 40-year from the laboratory-scale to full-scale. It is well-known that in actual applications, the solo application of anammox is not feasible. Since both ammonium and nitrite are prerequisites based on the reaction mechanism, the pre-treatment of wastewater is necessary. With the combination of anammox process and other pre-treatment processes to treat the actual wastewater, many types of anammox-based processes have been developed with distinct nitrogen removal performance. Thus, in order to heighten the awareness of researchers to the developments and accelerate the application of these processes to the treatment of actual wastewater, the main anammox-based processes are reviewed in this paper. It includes the partial nitritation/anammox process, the denitratation/anammox (PD/A) process, the denitrifying anaerobic methane oxidation/anammox (DAMO/A) process, and more complex deuterogenic processes. These processes have made the breakthroughs in the application of the anammox technology, such as the combination of nitrification and PD/A process can achieve stability and reliability of nitrogen removal in the treatment of mainstream wastewater, the PD/A process and the DAMO/A have brought about further improvements in the total nitrogen removal efficiency of wastewater. The diversity of functional microbe characteristics under the specific condition indicate the wide application potential of anammox-based processes, and further exploration is necessary. A whole waste treatment system concept is proposed through the effective allocation of above mentioned processes, with the maximum recovery of energy and resources, and minimal environmental impact.

关键词： Anammox Nitritation Denitratation Denitrifying anaerobic methane oxidation Mainstream wastewater

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Impact of food to microorganism ratio and alcohol ethoxylate dosage on methane production in treatment of low-strength wastewater by a submerged anaerobic membrane bioreactor

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Frontiers of Environmental Science & Engineering 2017年第6期11卷 47-57页

作者： yulun Nie Xike Tian Zhaoxin Zhou yu-you li Faculty of Material Science and Chemistry China University of Geosciences Wuhan 430074 China Department of Civil and Environmental Engineering Graduate School of Engineering Tohoku University 6-6-06 Aza-Aoba Aramaki Aoba-ku Sendai Miyagi 980-8579 Japan

The effects of food to microorganism （FIM） ratio and alcohol ethoxylate （AE） dosage on the methane production potential were investigated in treatment of low-strength wastewater by a submerged anaerobic membrane bioreactor （SAnMBR）. The fate of AE and its acute and/or chronic impact on the anaerobic microbes were also analyzed. The results indicated that AE had an inhibitory effect to methane production potential （lag-time depends on the AE dosage） and the negative effect attenuated subsequently and methane production could recover at FIM ratio of 0.088-0.357. VFA measurement proved that AE was degraded into small molecular organic acids and then converted into methane at lower FIM ratio （FIM 〈 0.158）. After long-term acclimation, anaerobic microbe could cope with the stress of AE by producing more EPS （extracellular polymeric substances） and SMP （soluble microbial products） due to its self-protection behavior and then enhance its tolerance ability. However, the methane production potential was considerably decreased when AE was present in wastewater at a higher FIM ratio of 1.054. Higher AE amount and FIM ratio may destroy the cell structure of microbe, which lead to the decrease of methane production activity of sludge and methane production potential.

关键词： Anaerobic membrane bioreactor AnMBR F/M ratio Surfactant Wastewater Methane production Influence

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Methanation and chemolitrophic nitrogen removal by an anaerobic membrane bioreactor coupled partial nitrification and Anammox

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Frontiers of Environmental Science & Engineering 2023年第6期17卷 37-47页

作者： Qian li Zhaoyang Hou Xingyuan Huang Shuming Yang Jinfan Zhang Jingwei Fu yu-you li Rong Chen Key Laboratory of Environmental Engineering of Shaanxi Province Xi'an University of Architecture and TechnologyXi'an 710055China Department of Civil and Environmental Engineering Graduate School of EngineeringTohoku UniversitySendai Miyagi 980-8579Japan International S&T Cooperation Center for Urban Alternative Water Resources Development Key Laboratory of Northwest Water ResourceEnvironment and Ecology(Ministry of Education)Xi'an University of Architecture and TechnologyXi'an 710055China

An AnMBR-PN/A system was developed for mainstream sewage *** verify the efficient methanation and subsequent chemolitrophic nitrogen removal,a long-term experiment and analysis of microbial activity were carried *** performance was less affected by the change of hydraulic retention time(HRT),which could provide a stable influent for subsequent PN/A *** COD removal efficiency of AnMBR was>93%during the experiment,85.5%of COD could be recovered in form of *** the HRT of PN/A being shortened from 10 to 6 h,nitrogen removal efficiency(NRE)of PN/A increased from 60.5%to 80.4%,but decreased to 68.8%when the HRTPN/A further decreased to 4 *** analysis revealed that the highest specific ammonia oxidation activity(SAOA)and the ratio of SAOA to specific nitrate oxidation activity(SNOA)provide stable NO_(2)^(−)-N/NH_(4)^(+)-N for anammox,and anammox bacteria(mainly identified as Candidatus Brocadia)enriched at the bottom of Anammox-UASB might play an important role in nitrogen *** addition,the decrease of COD in Anammox-UASB indicated partial denitrification occurred,which jointly promoted nitrogen removal with anammox.

关键词： Anaerobic membrane bioreactor Partial nitrification/Anammox Carbon separation Chemolitrophic nitrogen removal

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Risk factors for gastroesophageal reflux disease,reflux esophagitis and non-erosive reflux disease among Chinese patients undergoing upper gastrointestinal endoscopic examination

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World Journal of Gastroenterology 2007年第45期13卷 6009-6015页

作者： Juan Du Jiang liu Hong Zhang Chao-Hui yu you-Ming li Department of Gastroenterology First Affiliated Hospital College of Medicine Zhejiang University Hangzhou 310003 Zhejiang Province China

AIM: To analyze the spectrum and risk factors of gastroesophageal reflux disease (GERD) based on presenting symptoms and endoscopic f indings. METHODS: A cross-sectional survey in a cluster random sample was conducted from November 2004 to June 2005 using a validated Chinese version Reflux Disease Questionnaire (RDQ) and other items recording the demographic characteristics and potential risk factors for GERD. Subjects were def ined as having GERD symptoms according to the RDQ score (> 12). All subjects were endoscopied and the def inition and severity of erosive esophagitis were evaluated by Los Angeles classif ication. The statistical analysis was performed with SPSS13.0 programs. RESULTS: Of 2231 recruited participants, 701 (31.40%) patients were diagnosed as having GERD while 464 (20.80%) patients had objective findings of reflux esophagitis (RE). Of those 464 patients, only 291 (13.00%) were reported as subjects with GERD symptoms. A total of 528 (23.70%) patients were found to have GERD symptoms, including 19.50% patients with grade A or B reflux esophagitis, 0.90% with grade C and 0.40% with grade D. On multivariate analysis, old age, male, moderate working burden, divorced/widowed and strong tea drinking remained as signif icant independent risk factors for erosive esophagitis. Meanwhile, routine usage of greasy food and constipation were considered as significant independent risk factors for non-erosive reflux disease (NERD). CONCLUSION: GERD is one of the common GI diseaseswith a high occurrence rate in China and its main associated factors include sex, anthropometrical variables and sociopsychological characteristics.

关键词： Gastroesophageal reflux disease Refluxesophagitis Non-erosive reflux disease Prevalence Riskfactors Endoscopy

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Niche Differentiation of Phenol-Degrading Microorganisms in UASB Granular Sludge as Revealed by Fluorescence in situ Hybridization

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Engineering 2022年第2期8卷 61-66页

作者： Kengo Kubota Kei Igarashi Masayoshi Yamada Yasuyuki Takemura yu-you li Hideki Harada Department of Civil and Environmental Engineering Tohoku UniversitySendai 980-8579Japan Department of Urban Environmental Design and Engineering National Institute of TechnologyKagoshima CollegeKirishima 899-5193Japan New Industry Creation Hatchery Center Tohoku UniversitySendai 980-8579Japan

A microbial community structure of granules harvested from an anaerobic sludge blanket reactor treating phenolic wastewater was investigated using fluorescence in situ hybridization(FISH)and clone library *** of Syntrophorhabdaceae and Cryptanaerobacter were observed to be responsible for phenol *** accurate taxonomic assignment of Cryptanaerobacter clones,phylogenetic analysis using nearly full-length 16S ribosomal RNA(rRNA)gene sequences was *** oligonucleotide probes were designed to detect the following three taxonomic groups:Syntrophorhabdaceae,Cryptanaerobacter,and *** analysis of thin sections of anaerobic granules showed a random distribution of bacteria and ***,a well-defined distribution of Syntrophorhabdaceae,Cryptanaerobacter,and Syntrophus was *** and Syntrophus were found on the outer layer of the granules and were closely associated with each other,while Syntrophorhabdaceae was located in the deeper part of the *** specific distribution of the bacteria is most likely due to their metabolic association and affinity for the *** degradation in the granular sludge was observed to be carried out in the following ***,Cryptanaerobacter converts phenol to benzoate,which is then degraded by Syntrophus into *** syntrophic degradation of phenol occurs near the surface of the granule,where the phenol concen-tration is *** the deeper part of the granule,where the phenol concentration is lower,Syntrophorhabdaceae degrades phenol into *** observed that Syntrophorhabdaceae is less likely to produce benzoate as an intermediate to feed the neighboring organisms,which contradicts the theo-ries presented by previous studies.

关键词： Cryptanaerobacter Fluorescence in situ hybridization Anaerobic phenol degradation Syntrophorhabdaceae Syntrophus UASB granular sludge

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On the effect of Fe(Ⅲ) on proliferation of Microcystis aeruginosa at high nitrate and low chlorophyll condition

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Journal of Environmental Sciences 2017年第2期29卷 105-110页

作者： Rong Chen Zhen Lei Jiayuan Ji Xiaochang Wang yu-you li yuan Yang Lu Zhang Tao Xue Key Lab of Northwest Water Resource Environment and Ecology MOE Xi'an University of Architecture and Technology Department of Civil and Environmental Engineering Graduate School of Engineering Tohoku University

The impact of Fe concentrations on the growth of Microcystis aeruginosa in aquatic systems under high nitrate and low chlorophyll conditions was studied. The responses of cell density,total and cell chlorophyll-a intracellular Fe content and organic elemental composition of *** to different concentration gradients of Fe（Ⅲ） in the solutions were analysed. The results showed that the proliferation speeds of M. aeruginosa were：（1） decelerated when the Fe（Ⅲ） concentration was lower than 50 μg/L in the solutions,（2） promoted and positively related to the increase of Fe（Ⅲ） concentration from 100 to 500 μg/L in the solutions over the experimental period, and（3） promoted in the early stage but decelerated in later stages by excess adsorption of Fe by cells when the Fe（Ⅲ） concentration was higher than 500 μg/L in the solutions. The maximum cell density, total and cell chlorophyll-a were all observed at 500 μg Fe（Ⅲ）/L concentration. The organic elemental composition of M. aeruginosa was also affected by the concentration of Fe（Ⅲ） in the solutions, and the molecular formula of M. aeruginosa should be expressed as C7–7.5H14O0.8–1.3N3.5–5according to the functions for different Fe（Ⅲ）concentrations. Cell carbon and oxygen content appeared to increase slightly, while cell nitrogen content appeared to decrease as Fe（Ⅲ） concentrations increased from 100 to 500 μg/L in the solutions. This was attributed to the competition of photosynthesis and nitrogen adsorption under varying cell Fe content.

关键词： High nitrate Low chlorophyll Fe Microcystis aeruginosa Cell chlorophyll a Organic element composition

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Association of the frequency of peripheral natural killer T cells with nonalcoholic fatty liver disease

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World Journal of Gastroenterology 2007年第33期13卷 4504-4508页

作者： Cheng-Fu Xu Chao-Hui yu you-Ming li Lei Xu Juan Du Zhe Shen Department of Gastroenterology The First Affiliated Hospital of Zhejiang University School of Medicine Hangzhou 310003 Zhejiang Province China

AIM: To investigate whether changes in the frequencyof peripheral natural killer T (NKT) cells were correlatedwith liver disease in patients who had metabolicpredispositions to nonalcoholic fatty liver disease(NAFLD).METHODS: Peripheral blood samples were obtainedfrom 60 Chinese NAFLD patients and 60 age and gendermatched healthy controls. The frequency of peripheralNKT cells was detected by flow cytometry. Clinical andlaboratory data were collected for further analysis. RESULTS: NAFLD patients had a lower frequencyof peripheral NKT cells than healthy controls (1.21%± 0.06% vs 1.62% ± 0.07%, P < 0.001). Furtheranalysis revealed that the frequency of peripheralNKT cells was negatively correlated with body massindex, waist circumference and serum levels of alanineaminotransferase. Logistic regression analysis revealedthat elevated body mass index [hazard ratio (HR):2.991], aspartate aminotransferase levels (HR: 1.148)and fasting blood sugar (HR: 3.133) increased the riskof NAFLD, whereas an elevated frequency of peripheralNKT cells (HR: 0.107) decreased the risk. CONCLUSION: Changes in the frequency of peripheralNKT cells were correlated with NAFLD and a decreasedfrequency of peripheral NKT cells was a risk factor forNAFLD.

关键词： Nonalcoholic fatty liver disease Natural killer T cells Flow cytometry Risk factor

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Why patients with refractory epilepsy reject surgery in China

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Chinese Medical Journal 2014年第20期127卷 3672-3673页

作者： liu Jianming Xu Ruxiang you yu Man li liu Zhiliang Affiliated Bayi Brain Hospital Bayi Clinical College SouthernMedical University Beijing 100700 China

EPilepsy is a common neurological disorder among all age groups and socioeconomic classes. Epilepsy surgery has been demonstrated to be a safe and effective treatment for drug-refractory *** this success, many potential surgical candidates refuse surgery. On average, there is a 20-year delay between the diagnosis of epilepsy and surgical treatment,1 suggesting that epilepsy surgery is underutilized. The prevalence of active epilepsy is even higher in developing countries due to the limited availability and high cost of medication. To date, however, few studies have addressed the reasons for delayed surgical treatment in developing countries such as China. To address these issues, we conducted a cross- sectional survey to document potential barriers limiting patients access to the surgical treatment of epilepsy.

关键词： intractable epilepsy patient recruitment attitudes referraL surgery

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Matrix metalloproteinase-9 was involved in the immuno-modulatory defect of mesenchymal stem cell from chronic myeloid leukemia patients

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Chinese Medical Journal 2011年第16期124卷 2423-2430页

作者： ZHU Xi-shan SHI Wei AN Guang-yu ZHANG Hong-mei SONG yu-guang li you-bin Institute of Internal Oncology Center of Tumor Research andTherapy Beijing Shijitan Hospital Capital Medical University (theNinth Medical College of Peking University) Beijing 100038China

Background Overwhelming evidences on chronic myeloid leukemia （CML） indicate that patients harbor quiescent CML stem cells that are responsible for blast crisis. While the hematopoietic stem cell （HSC） origin of CML was first suggested over 30 years ago, recently CML-initiating cells beyond HSCs are also being investigated. Methods We have previously isolated fetal liver kinase-l-positive （Flkl＋） cells carrying the BCR/ABL fusion gene from the bone marrow of Ph＋ patients with hemangioblast property. In this study, we isolated CML patient-derived FIk1＋CD31-CD34- mesenchymal stem cells （MSCs） and detected their biological characteristics and immunological regulation using fluorescence in situ hybridization （FISH） analysis, fluorescence activated cell sorting （FACS）, enzyme-linked immunoadsorbent assay, mixed lymphocyte reaction assays; then we compared these characters with those of the healthy donors. Results CML patient-derived FIk1＋CD31-CD34- MSCs had normal morphology, phenotype and karyotype while appeared impaired in immuno-modulatory function. The capacity of patient FIk1＋CD31-CD34- MSCs to inhibit T lymphocyte activation and proliferation was impaired in vitro. Conclusions CML patient-derived MSCs have impaired immuno-modulatory functions, suggesting that the dysregulation of hematopoiesis and immune response may originate from MSCs rather than hematopoietic stem cells （HSCs）. MSCs might be a potential target for developing efficacious treatment for CML.

关键词： chronic myeloid leukemia mesenchymal stem cell immune regulation matrix metalloproteinase-9

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