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Fe(Ⅱ)对CANON工艺处理城镇污水脱氮性能的影响
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作者 张倩倩 廖祖刚 +3 位作者 冯泽通 刘金泽 符文婧 赵剑强 《安全与环境工程》 CAS CSCD 北大核心 2024年第2期291-300,共10页
全程自养脱氮(CANON)工艺,作为新型脱氮工艺应用于城镇污水深度脱氮过程中,有望降低污水处理的运行费用。考察了亚铁离子[Fe(Ⅱ)]对CANON工艺启动及稳定运行时脱氮性能的影响。结果表明:15~23℃条件下投加6.3 mg/L Fe(Ⅱ)时,可有效启动... 全程自养脱氮(CANON)工艺,作为新型脱氮工艺应用于城镇污水深度脱氮过程中,有望降低污水处理的运行费用。考察了亚铁离子[Fe(Ⅱ)]对CANON工艺启动及稳定运行时脱氮性能的影响。结果表明:15~23℃条件下投加6.3 mg/L Fe(Ⅱ)时,可有效启动并稳定运行CANON工艺处理城镇污水,该工艺氮去除负荷(NRR)、总氮去除率(TNRE)和氨氮去除率(ARE)分别为(4.8±1.1)g-N/(L^(3)·d)、(97±1)%和(44.2±9.3)%;相关性分析表明,通过调控Fe(Ⅱ)投加量可有效抑制亚硝酸盐氧化菌(NOB)的活性;本次优化的Fe(Ⅱ)投加量为6.3 mg/L,其对CANON工艺脱氮性能的影响机制与CANON工艺中功能微生物活性的提高、Fe(Ⅱ)与进水氨氮及其他氮化合物的循环反应、铁型反硝化过程以及铁型厌氧氨氧化过程的耦合有关。 展开更多
关键词 canon工艺 城镇污水 Fe(Ⅱ) 脱氮效能
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CRABP1-mediated non-canonical retinoic acid signaling in motor neurons and neural stem cells
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作者 Li-Na Wei 《Neural Regeneration Research》 SCIE CAS CSCD 2024年第6期1169-1170,共2页
Retinoic acid(RA),the active metabolite of vitamin A(the retinoids),elicits a wide spectrum of biological activities critical to the development and health of most of the organ systems including the nervous systems(Co... Retinoic acid(RA),the active metabolite of vitamin A(the retinoids),elicits a wide spectrum of biological activities critical to the development and health of most of the organ systems including the nervous systems(Corcoran et al.,2002).The effects of RA are mediated by two very distinct pathways;the first is manifested in the nucleus by binding to a large family of nuclear RA receptors(RARs)to regulate proper expression of RAtargeted genes. 展开更多
关键词 canonICAL SPECTRUM CRITICAL
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Cross-Project Software Defect Prediction Based on SMOTE and Deep Canonical Correlation Analysis
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作者 Xin Fan Shuqing Zhang +2 位作者 Kaisheng Wu Wei Zheng Yu Ge 《Computers, Materials & Continua》 SCIE EI 2024年第2期1687-1711,共25页
Cross-Project Defect Prediction(CPDP)is a method that utilizes historical data from other source projects to train predictive models for defect prediction in the target project.However,existing CPDP methods only consi... Cross-Project Defect Prediction(CPDP)is a method that utilizes historical data from other source projects to train predictive models for defect prediction in the target project.However,existing CPDP methods only consider linear correlations between features(indicators)of the source and target projects.These models are not capable of evaluating non-linear correlations between features when they exist,for example,when there are differences in data distributions between the source and target projects.As a result,the performance of such CPDP models is compromised.In this paper,this paper proposes a novel CPDP method based on Synthetic Minority Oversampling Technique(SMOTE)and Deep Canonical Correlation Analysis(DCCA),referred to as S-DCCA.Canonical Correlation Analysis(CCA)is employed to address the issue of non-linear correlations between features of the source and target projects.S-DCCA extends CCA by incorporating the MlpNet model for feature extraction from the dataset.The redundant features are then eliminated by maximizing the correlated feature subset using the CCA loss function.Finally,cross-project defect prediction is achieved through the application of the SMOTE data sampling technique.Area Under Curve(AUC)and F1 scores(F1)are used as evaluation metrics.This paper conducted experiments on 27 projects from four public datasets to validate the proposed method.The results demonstrate that,on average,our method outperforms all baseline approaches by at least 1.2%in AUC and 5.5%in F1 score.This indicates that the proposed method exhibits favorable performance characteristics. 展开更多
关键词 Cross-project defect prediction deep canonical correlation analysis feature similarity
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The Publication of the Piling Canon in the Late Qing
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作者 LIU Yi 《Cultural and Religious Studies》 2024年第9期566-574,共9页
Piling Canon refers to a woodblock-printed Chinese Buddhist Canon during the late Qing Dynasty.Despite its historical significance,it has received limited attention from the academia,as its discovery took place after ... Piling Canon refers to a woodblock-printed Chinese Buddhist Canon during the late Qing Dynasty.Despite its historical significance,it has received limited attention from the academia,as its discovery took place after the turn of the 21st century.This study explores the background,supervisor,proofreader,engravers,donors,and other factors that contributed to the publication of the Piling Canon.It was supervised by Buddhist monk Qingrong in Changzhou Tianning Monastery from 1908 to 1926,due to the commission of Yang Wenhui.By investigating the historical records in the colophons of Piling Canon,we found that engraving locations are distributed in Hubei,Yangzhou,and Danyang which engravers operated in groups;the majority of donors were found to be individuals and group forms,social fundraising was included as well.It is noteworthy that Sheng Xuanhuai made a significant contribution in terms of funding.Furthermore,the production of the Piling Canon confirms to the commence of Buddhism revival,as Buddhist scriptures in Jiangnan regions were almost destroyed after the Taiping Rebellion.The research shed light on extensive participation of cultural celebrities,diverse donation forms,and excellent engraving,offering a vivid depiction of Buddhist belief and social landscape in Jiangnan region. 展开更多
关键词 Piling canon Buddhist scriptures Tianning Monastery DONORS Jiangnan
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Crosstalk among canonical Wnt and Hippo pathway members in skeletal muscle and at the neuromuscular junction
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作者 Said Hashemolhosseini Lea Gessler 《Neural Regeneration Research》 SCIE CAS 2025年第9期2464-2479,共16页
Skeletal muscles are essential for locomotion,posture,and metabolic regulation.To understand physiological processes,exercise adaptation,and muscle-related disorders,it is critical to understand the molecular pathways... Skeletal muscles are essential for locomotion,posture,and metabolic regulation.To understand physiological processes,exercise adaptation,and muscle-related disorders,it is critical to understand the molecular pathways that underlie skeletal muscle function.The process of muscle contra ction,orchestrated by a complex interplay of molecular events,is at the core of skeletal muscle function.Muscle contraction is initiated by an action potential and neuromuscular transmission requiring a neuromuscular junction.Within muscle fibers,calcium ions play a critical role in mediating the interaction between actin and myosin filaments that generate force.Regulation of calcium release from the sarcoplasmic reticulum plays a key role in excitation-contraction coupling.The development and growth of skeletal muscle are regulated by a network of molecular pathways collectively known as myogenesis.Myogenic regulators coordinate the diffe rentiation of myoblasts into mature muscle fibers.Signaling pathways regulate muscle protein synthesis and hypertrophy in response to mechanical stimuli and nutrient availability.Seve ral muscle-related diseases,including congenital myasthenic disorders,sarcopenia,muscular dystrophies,and metabolic myopathies,are underpinned by dys regulated molecular pathways in skeletal muscle.Therapeutic interventions aimed at preserving muscle mass and function,enhancing regeneration,and improving metabolic health hold promise by targeting specific molecular pathways.Other molecular signaling pathways in skeletal muscle include the canonical Wnt signaling pathway,a critical regulator of myogenesis,muscle regeneration,and metabolic function,and the Hippo signaling pathway.In recent years,more details have been uncovered about the role of these two pathways during myogenesis and in developing and adult skeletal muscle fibers,and at the neuromuscular junction.In fact,research in the last few years now suggests that these two signaling pathways are interconnected and that they jointly control physiological and pathophysiological processes in muscle fibers.In this review,we will summarize and discuss the data on these two pathways,focusing on their concerted action next to their contribution to skeletal muscle biology.However,an in-depth discussion of the noncanonical Wnt pathway,the fibro/a dipogenic precursors,or the mechanosensory aspects of these pathways is not the focus of this review. 展开更多
关键词 canonical Wnt"Wingless-related integration site"pathway beta-catenin(CTNNB1) Hippo pathway MYOGENESIS MYOTUBE neuromuscular junction satellite cell skeletal muscle fiber transcriptional co-activator with PDZ-binding motif(TAZ) T-cell-specific transcription factor/lymphoid enhancer-binding factor(TCF/LEF) TEA domain family member(TEAD) transducin-like enhancer of split(TLE) yes-associated protein 1(YAP1)
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水力条件对CANON工艺颗粒污泥特性的影响研究
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作者 漆磊 《四川环境》 2023年第5期25-30,共6页
为实现自养生物脱氮,采用膨胀颗粒污泥床小试反应器(R1~R3)培养全程自养脱氮工艺(Completely Autotrophic Nitrogen Removal Over Nitrite, CANON)颗粒污泥,考察了不同上升流速、水力剪切力和溶解氧浓度下CANON颗粒污泥浓度和粒径的变... 为实现自养生物脱氮,采用膨胀颗粒污泥床小试反应器(R1~R3)培养全程自养脱氮工艺(Completely Autotrophic Nitrogen Removal Over Nitrite, CANON)颗粒污泥,考察了不同上升流速、水力剪切力和溶解氧浓度下CANON颗粒污泥浓度和粒径的变化规律。结果表明:系统稳定后,污泥浓度呈现出R2>R1>R3,R1、R2成功实现CANON颗粒污泥启动,并且实现了颗粒化,而R3中较高的上升流速、水力剪切力导致系统内污泥易碎裂从而洗出系统,导致R3未能启动成功。 展开更多
关键词 canon工艺 颗粒污泥 剪切力 污泥浓度 污泥粒径
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长期-短期饥饿对CANON工艺启动的影响
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作者 杨综艺 李军 +2 位作者 张凯 高鹏 唐鹏 《中国环境科学》 EI CAS CSCD 北大核心 2023年第7期3429-3437,共9页
采用序批式反应器(SBR)启动全程自养脱氮(CANON)工艺,考察启动过程中长期饥饿胁迫和短期饥饿调控对脱氮效果的影响,对短期饥饿前后功能菌活性进行测试,分析在缩短恢复时间下反复进行短期饥饿对亚硝酸盐氧化菌(NOB)的抑制作用,对CANON启... 采用序批式反应器(SBR)启动全程自养脱氮(CANON)工艺,考察启动过程中长期饥饿胁迫和短期饥饿调控对脱氮效果的影响,对短期饥饿前后功能菌活性进行测试,分析在缩短恢复时间下反复进行短期饥饿对亚硝酸盐氧化菌(NOB)的抑制作用,对CANON启动过程中的不同阶段进行微生物测序,分析群落结构的变化情况.结果表明,长期饥饿后系统在7d恢复运行时,TN去除率(NRE)可达到62.34%.短期饥饿-恢复模式加快了工艺的启动速度,成功将SBR中ΔNO_(3)^(-)-N/ΔNH_(4)^(+)-N控制在0.11左右.在实现启动时,工艺平均氨氮去除率(ARE)超过95%,平均NRE可达79.45%.采用短期饥饿调控前后,NOB活性由91.32mgN/(gVSS·d)降至45.40mgN/(gVSS·d),比厌氧氨氧化活性(SAA)升高至219.25mgN/(gVSS·d),保证了CANON脱氮性能.高通量测序表明,在经历长期饥饿后,好氧氨氧化菌(AerAOB)功能菌Nitrosomonas能够迅速恢复.Candidatus Kuenenia具有抵抗长期饥饿的能力,在7d恢复运行后,相对丰度高达69.04%,在稳定恢复运行中,丰度有所降低,但在工艺启动后丰度达到61.19%,实现了厌氧氨氧化菌(AnAOB)的富集.CANON工艺能够在长期饥饿胁迫中恢复,短期饥饿调控有利于提高工艺效能. 展开更多
关键词 全程自养脱氮(canon) 长期饥饿 功能菌活性 亚硝酸盐氧化菌(NOB)
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低C/N比CANON工艺脱氮机制分析
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作者 田亮 黄锐 +1 位作者 杜冬云 吴晨捷 《环境科学与技术》 CAS CSCD 北大核心 2023年第10期104-111,共8页
该文在微氧升流反应器中构建颗粒-絮体污泥体系,以乙酸钠作为碳源,探究了C/N对CANON工艺脱氮效率的影响,并分析了低C/N下该工艺的脱氮机制。当C/N=0.75时,TN和NH_(4)^(+)-N去除率达到了最高值92%和95%。而当C/N从0.75增长至1时,TN和NH_(... 该文在微氧升流反应器中构建颗粒-絮体污泥体系,以乙酸钠作为碳源,探究了C/N对CANON工艺脱氮效率的影响,并分析了低C/N下该工艺的脱氮机制。当C/N=0.75时,TN和NH_(4)^(+)-N去除率达到了最高值92%和95%。而当C/N从0.75增长至1时,TN和NH_(4)^(+)-N去除率分别下降至80%和85%;C/N回调至0.75后,10 d左右反应器性能恢复至91%TN去除率。C/N=0.75时脱氮贡献分析和粒度分布表明AnAOB对NO_(2)^(-)-N的摄取处于优势地位,反应器内主要发生Anammox反应和短程反硝化反应,合适的C/N并不会导致异养菌取代AnAOB的优势地位,且Anammox反应的脱氮贡献在56%~62%之间。 展开更多
关键词 微氧升流反应器 canon工艺 颗粒-絮体污泥 脱氮机制 低C/N
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3-D Gait Identification Utilizing Latent Canonical Covariates Consisting of Gait Features 被引量:1
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作者 Ramiz Gorkem Birdal Ahmet Sertbas 《Computers, Materials & Continua》 SCIE EI 2023年第9期2727-2744,共18页
Biometric gait recognition is a lesser-known but emerging and effective biometric recognition method which enables subjects’walking patterns to be recognized.Existing research in this area has primarily focused on fe... Biometric gait recognition is a lesser-known but emerging and effective biometric recognition method which enables subjects’walking patterns to be recognized.Existing research in this area has primarily focused on feature analysis through the extraction of individual features,which captures most of the information but fails to capture subtle variations in gait dynamics.Therefore,a novel feature taxonomy and an approach for deriving a relationship between a function of one set of gait features with another set are introduced.The gait features extracted from body halves divided by anatomical planes on vertical,horizontal,and diagonal axes are grouped to form canonical gait covariates.Canonical Correlation Analysis is utilized to measure the strength of association between the canonical covariates of gait.Thus,gait assessment and identification are enhancedwhenmore semantic information is available through CCA-basedmulti-feature fusion.Hence,CarnegieMellon University’s 3D gait database,which contains 32 gait samples taken at different paces,is utilized in analyzing gait characteristics.The performance of Linear Discriminant Analysis,K-Nearest Neighbors,Naive Bayes,Artificial Neural Networks,and Support Vector Machines was improved by a 4%average when the CCA-utilized gait identification approachwas used.Asignificant maximumaccuracy rate of 97.8%was achieved throughCCA-based gait identification.Beyond that,the rate of false identifications and unrecognized gaits went down to half,demonstrating state-of-the-art for gait identification. 展开更多
关键词 Gait identification canonical covariates multivariate data analysis gait determinant
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An Update Method of Decision Implication Canonical Basis on Attribute Granulating 被引量:1
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作者 Yanhui Zhai Rujie Chen Deyu Li 《Intelligent Automation & Soft Computing》 SCIE 2023年第8期1833-1851,共19页
Decision implication is a form of decision knowledge represen-tation,which is able to avoid generating attribute implications that occur between condition attributes and between decision attributes.Compared with other... Decision implication is a form of decision knowledge represen-tation,which is able to avoid generating attribute implications that occur between condition attributes and between decision attributes.Compared with other forms of decision knowledge representation,decision implication has a stronger knowledge representation capability.Attribute granularization may facilitate the knowledge extraction of different attribute granularity layers and thus is of application significance.Decision implication canonical basis(DICB)is the most compact set of decision implications,which can efficiently represent all knowledge in the decision context.In order to mine all deci-sion information on decision context under attribute granulating,this paper proposes an updated method of DICB.To this end,the paper reduces the update of DICB to the updates of decision premises after deleting an attribute and after adding granulation attributes of some attributes.Based on this,the paper analyzes the changes of decision premises,examines the properties of decision premises,designs an algorithm for incrementally generating DICB,and verifies its effectiveness through experiments.In real life,by using the updated algorithm of DICB,users may obtain all decision knowledge on decision context after attribute granularization. 展开更多
关键词 Decision context attribute granulating decision implication decision implication canonical basis
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Cohen-Macaulay局部环上的Canonical模
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作者 路姣姣 杨晓燕 《吉林大学学报(理学版)》 CAS 北大核心 2023年第1期61-65,共5页
令(R,m,k)是Cohen-Macaulay局部环,M,N是有限生成R-模.假设N∈ΩCM(R),且Ext_(R)^(1≤i≤d)(M,N)=0,证明HomR(M,N)∈ΩCM(R),并给出有限生成模N是canonical模的条件.
关键词 Cohen-Macaulay局部环 极大Cohen-Macaulay模 canonical模
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Drivers of Forecasting the Behavioral Intention and Acceptance Behavior of the Hail Canon Technology(HCT): Using Logistic and System Dynamics Modeling
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作者 ABADI Bijan HAGHANINIA Mohammad 《Chinese Geographical Science》 SCIE CSCD 2023年第3期549-564,共16页
Globally known about the drivers through which farmers are instigated to uphold and use Hail Canon Technology(HCT)is lacking.Therefore,this article intended to examine the drivers of forecasting the behavioral intenti... Globally known about the drivers through which farmers are instigated to uphold and use Hail Canon Technology(HCT)is lacking.Therefore,this article intended to examine the drivers of forecasting the behavioral intention and acceptance behavior of the HCT,249 apple farmers from northwestern Iran were recruited,including adopters(n1=114)and non-adopters(n2=135).The conceptual foundation included demographic theory,resource-based theory,theory of planned behavior,innovation diffusion model,and institutional support model.We also used the system dynamics model(SDM)in the Netlogo to assess the results of the conventional statistical approach(i.e.,the logistic model).Authenticated the fitness of conceptual model with the data,logistic model manifests that the most outstanding determinants of the acceptance of HCT entail age,experience,total land size,income,attitude,compatibility,visibility,relative advantage,and financial support.Using the SDM,it was also shown that the results of the logistic model are confirmed by the SDM.In conclusion,management implications are available for the university extension to eliminate the adoption obstacles and stir up farmers to join in applying HCT,furthermore,researchers would avail themselves of remarks for future research. 展开更多
关键词 canon VISIBILITY furthermore
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Grand canonical Monte Carlo simulation study of hydrogen storage by Li-decorated pha-graphene
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作者 张蒙蒙 张凤 +7 位作者 吴强 黄欣 闫巍 赵春梅 陈伟 杨志红 王允辉 武婷婷 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第6期476-480,共5页
Grand canonical Monte Carlo simulation(GCMCs)is utilized for studying hydrogen storage gravimetric density by pha-graphene at different metal densities,temperatures and pressures.It is demonstrated that the optimum ad... Grand canonical Monte Carlo simulation(GCMCs)is utilized for studying hydrogen storage gravimetric density by pha-graphene at different metal densities,temperatures and pressures.It is demonstrated that the optimum adsorbent location for Li atoms is the center of the seven-membered ring of pha-graphene.The binding energy of Li-decorated phagraphene is larger than the cohesive energy of Li atoms,implying that Li can be distributed on the surface of pha-graphene without forming metal clusters.We fitted the force field parameters of Li and C atoms at different positions and performed GCMCs to study the absorption capacity of H_(2).The capacity of hydrogen storage was studied by the differing density of Li decoration.The maximum hydrogen storage capacity of 4Li-decorated pha-graphene was 15.88 wt%at 77 K and100 bar.The enthalpy values of adsorption at the three densities are in the ideal range of 15 kJ·mol^(-1)-25 kJ·mol^(-1).The GCMC results at different pressures and temperatures show that with the increase in Li decorative density,the hydrogen storage gravimetric ratio of pha-graphene decreases but can reach the 2025 US Department of Energy's standard(5.5 wt%).Therefore,pha-graphene is considered to be a potential hydrogen storage material. 展开更多
关键词 hydrogen storage pha-graphene grand canonical Monte Carlo simulation(GCMCs) force field
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Analysis of Differential Gene Expression and Core Canonical Pathways Involved in the Epithelial to Mesenchymal Transition of Triple Negative Breast Cancer Cells by Ingenuity Pathway Analysis
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作者 Elizabeth Cagle Brent Lake +10 位作者 Anasua Banerjee Jazmine Cuffee Narendra Banerjee Darla Gilmartin Makaiyah Liverman Shennel Brown Erik Armstrong Santanu Bhattacharya Somiranjan Ghosh Tanmoy Mandal Hirendra Banerjee 《Computational Molecular Bioscience》 2023年第2期21-34,共14页
Triple Negative Breast Cancer (TNBC) is a malignant form of cancer with very high mortality and morbidity. Epithelial to Mesenchymal Transition (EMT) is the most common pathophysiological change observed in cancer cel... Triple Negative Breast Cancer (TNBC) is a malignant form of cancer with very high mortality and morbidity. Epithelial to Mesenchymal Transition (EMT) is the most common pathophysiological change observed in cancer cells of epithelial origin that promotes metastasis, drug resistance and cancer stem cell formation. Since the information regarding differential gene expression in TNBC cells and cell signaling events leading to EMT is limited, this investigation was done by comparing transcriptomic data generated by RNA isolation and sequencing of a EMT model TNBC cell line in comparison to regular TNBC cells. RNA sequencing and Ingenuity Pathway Software Analysis (IPA) of the transcriptomic data revealed several upregulated and downregulated gene expressions along with novel core canonical pathways including Sirtuin signaling, Oxidative Phosphorylation and Mitochondrial dysfunction events involved in EMT changes of the TNBC cells. 展开更多
关键词 Triple Negative Breast Cancer Epithelial to Mesenchymal Transition Core canonical Pathways
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基于Canonical最小二乘蒙特卡罗法的可转债定价
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作者 殷炼乾 皮蓉 《债券》 2023年第12期91-97,共7页
区别于传统的最小二乘蒙特卡罗方法,本文利用标的资产收益率生成Canonical风险中性概率计算累计概率分布函数进行抽样,以此生成标的资产价格的蒙特卡罗路径。同时,运用平赌过程适配法对蒙特卡罗模拟进行改进,以提高模型的收敛速度并降... 区别于传统的最小二乘蒙特卡罗方法,本文利用标的资产收益率生成Canonical风险中性概率计算累计概率分布函数进行抽样,以此生成标的资产价格的蒙特卡罗路径。同时,运用平赌过程适配法对蒙特卡罗模拟进行改进,以提高模型的收敛速度并降低其误差。针对可转债的特殊条款,本文按照市场惯例及逻辑,将回售条款与下修条款结合处理,以提高模型的可行性和运算效率。最后,使用传统的参数化方法进行对比实验。结果表明,本文所设计方法的模拟路径比传统方法更能体现标的资产的运动特性,定价结果优于传统的参数化方法。 展开更多
关键词 可转债定价 最小二乘蒙特卡罗 canonical风险中性概率 平赌过程适配法
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一类非线性优化的Canonical对偶函数
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作者 朱经浩 严旺光 《同济大学学报(自然科学版)》 EI CAS CSCD 北大核心 2010年第2期307-310,共4页
研究如何获取球体约束下非线性优化的全局最小点.通过引入常微分方程和构造Canonical对偶函数的局部形式,引入了相应的对偶定理,勾勒出了原问题的KKT点和对偶问题的KKT点两者之间的关系.给出了凸乘子定义,对偶定理和搜寻全局最优点的方... 研究如何获取球体约束下非线性优化的全局最小点.通过引入常微分方程和构造Canonical对偶函数的局部形式,引入了相应的对偶定理,勾勒出了原问题的KKT点和对偶问题的KKT点两者之间的关系.给出了凸乘子定义,对偶定理和搜寻全局最优点的方法,并通过一些例子加以演示. 展开更多
关键词 canonical对偶函数 canonical对偶变换 全局最优化
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序批式生物膜CANON工艺的运行与温度的影响 被引量:37
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作者 张杰 付昆明 +2 位作者 曹相生 李冬 孟雪征 《中国环境科学》 EI CAS CSCD 北大核心 2009年第8期850-855,共6页
通过序批式生物膜反应器,研究了CANON工艺的运行规律,并研究了温度对CANON工艺的影响.研究发现,通过序批式生物膜反应器反应器可以成功实现CANON工艺,TN去除率可达到88.3%,TN去除负荷达到0.52kg/(m3.d).系统中的NO2--N变化规律可以分为... 通过序批式生物膜反应器,研究了CANON工艺的运行规律,并研究了温度对CANON工艺的影响.研究发现,通过序批式生物膜反应器反应器可以成功实现CANON工艺,TN去除率可达到88.3%,TN去除负荷达到0.52kg/(m3.d).系统中的NO2--N变化规律可以分为浓度上升期,浓度稳定期与浓度下降期.pH值先降低后升高的拐点与DO突跃的拐点均可作为反应结束的指示参数,DO拐点比pH值拐点出现要提前.在26~35℃之间,可以获得较好的硝化效果与TN去除效果,温度降低到20℃时,厌氧氨氧化性能开始受到显著影响,造成反应器中大量NO2--N积累,而硝化效果在15℃才受到显著影响.反应器中厌氧氨氧化细菌的最适温度约为30℃。 展开更多
关键词 canon 序批式生物膜反应器 厌氧氨氧化 温度
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氨氮浓度对CANON工艺性能及微生物特性的影响 被引量:17
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作者 张肖静 李冬 +4 位作者 梁瑜海 何永平 张玉龙 范丹 张杰 《中国环境科学》 EI CAS CSCD 北大核心 2014年第7期1715-1721,共7页
为了考察氨氮浓度对CANON反应器启动过程、运行性能及微生物特性的影响,在2个相同的常温MBR反应器内同时接种取自城市污水厂的普通活性污泥,在限氧条件下启动CANON工艺.其中R1进水氨氮保持80mg/L不变,通过逐渐减小HRT启动,R2则保持HRT不... 为了考察氨氮浓度对CANON反应器启动过程、运行性能及微生物特性的影响,在2个相同的常温MBR反应器内同时接种取自城市污水厂的普通活性污泥,在限氧条件下启动CANON工艺.其中R1进水氨氮保持80mg/L不变,通过逐渐减小HRT启动,R2则保持HRT不变,通过逐渐增加进水氨氮启动.启动成功后,2个反应器分别在不同氨氮浓度下稳定运行相同时间后,取泥样做扫描电镜观察反应器内微生物形态.同时采用克隆-测序分析技术对2个反应器内全细菌进行16S rRNA分析,鉴定反应器内功能微生物种属.结果表明,R1和R2的启动时间分别为78,50d.TN去除负荷分别达到0.9,0.7kg/(m3·d)以上.反应速率测定结果表明,高氨氮运行的反应器内亚硝化菌和厌氧氨氧化菌具有较高的活性,NOB被抑制或淘洗的较为彻底.SEM及克隆测序结果表明,2个反应器中的功能微生物均为亚硝化单胞菌和待定斯图加特库氏菌,R1中存在少量硝化杆菌,而R2中几乎检测不到硝化菌.因此,高氨氮下运行的反应器具有更高的活性及稳定性. 展开更多
关键词 canon 氨氮 MBR HRT DO
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MBR系统CANON工艺的快速启动及微生物种群特征 被引量:17
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作者 李冬 何永平 +3 位作者 张肖静 梁瑜海 张玉龙 范丹 《中国环境科学》 EI CAS CSCD 北大核心 2014年第11期2788-2795,共8页
为了考察CANON工艺的快速启动策略及功能微生物的种群特征,在常温MBR反应器内接种普通活性污泥后间歇运行.启动策略为以调控曝气时间和曝气量作为主要方法,首先在限氧条件下启动亚硝化,之后进一步降低DO启动CANON工艺.在CANON工艺启动... 为了考察CANON工艺的快速启动策略及功能微生物的种群特征,在常温MBR反应器内接种普通活性污泥后间歇运行.启动策略为以调控曝气时间和曝气量作为主要方法,首先在限氧条件下启动亚硝化,之后进一步降低DO启动CANON工艺.在CANON工艺启动成功后,通过调整曝气时间和无机碳源浓度提高了总氮去除负荷,并采用PCR-DGGE技术分析了稳定运行的CANON工艺内功能微生物的种群特征.结果表明,CANON工艺经36d成功启动,NH4+-N去除率和总氮去除率最终稳定在99%和84%左右,氮去除负荷达到0.41kg/(m3·d).DGGE测序结果表明,Nitrosomonas和Candidatus Kuenenia stuttgartiensis是反应器内的优势菌种,两种微生物协同作用,共同在MBR内完成了高效的自养脱氮. 展开更多
关键词 MBR 普通活性污泥 canon 启动 PCR-DGGE 微生物
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曝气量对不同填料CANON反应器运行效率的影响 被引量:14
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作者 付昆明 张杰 +3 位作者 曹相生 李冬 孟雪征 朱兆亮 《化工学报》 EI CAS CSCD 北大核心 2010年第2期496-503,共8页
一般而言,生物脱氮是采用常规的硝化反硝化工艺去除的,但此工艺对大多数高氨氮废水而言,并不适用,这是因为高氨氮废水往往会面临碳源不足的瓶颈,还存在曝气量过大的弊端:1gNH4+N完成硝化反应,就需要消耗4.57gO2[3],而曝气量... 一般而言,生物脱氮是采用常规的硝化反硝化工艺去除的,但此工艺对大多数高氨氮废水而言,并不适用,这是因为高氨氮废水往往会面临碳源不足的瓶颈,还存在曝气量过大的弊端:1gNH4+N完成硝化反应,就需要消耗4.57gO2[3],而曝气量是污水厂耗能的主要组成。 展开更多
关键词 canon工艺 曝气量 厌氧氨氧化 海绵块 改性聚乙烯
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