同步脱氮除磷好氧颗粒污泥的特性及其反应过秸

以普通絮状活性污泥为种泥,采用人工配制的模拟生活污水,在序批式反应器（SBR）中成功地培养出了同步脱氮除磷好氧颗粒污泥。污泥颗粒粒径大多在0．5～1．0mm,SVI为27．0mL/g,MLVSS／MLSS为86．8％,具有良好的沉降性能和较高的生物量。采用好氧颗粒污泥进行脱氮除磷过程研究,结果表明颗粒污泥具有良好的同步脱氮除磷和去除有机物的功能,反应周期结束时氮氮、PO4^3-P去除率接近100％,COD去除率达到90％以上。     

同步脱氮除磷好氧颗粒污泥的特性及其反应过程

以普通絮状活性污泥为种泥.采用人工配制的模拟生活污水,在序批式反应器(SBR)中成功地培养出了同步脱氮除磷好氧颗粒污泥.污泥颗粒粒径大多在0.5～1.0mm,SVI为27.0mL/g,MLVSS/MLSS为86.8%,具有良好的沉降性能和较高的生物量.采用好氧颗粒污泥进行脱氮除磷过程研究,结果表明颗粒污泥具有良好的同步脱氮除磷和去除有机物的功能.反应周期结束时氨氮、PO4-3-P去除率接近100%,COD去除率达到90%以上.     

螺旋升流式反应器系统中污泥特性

螺旋升流式反应器是一种新的污水处理工艺,该反应器具有很好的对COD、TP、TN等的处理效果。本文对螺旋升流式反应器在污水脱氮除磷处理中的污泥特性进行了分析,发现MLVSS／MLSS在厌氧单元中呈现递增变化趋势,在缺氧和好氧单元呈现递减变化趋势,这种变化趋势在脱氮除磷效果好时明显,不好时不明显。镜检发现反应器中微生物丰富多样,颗粒污泥紧密、结实。污泥的SV在10％～18％,SVI在30～70之间。污泥的耗氧呼吸速率SOUR随厌氧过程逐渐升高,好氧过程逐渐降低：脱氢酶活性却表现出与之相反的变化规律。     

序批式颗粒污泥系统同步脱氮除磷影响因素分析

采用批式实验,以人工配水培养的好氧颗粒污泥为接种污泥,考察了DO浓度、碳氮比、污泥龄对序批式颗粒污泥系统同步脱氮除磷效果的影响。结果表明,DO通过渗透作用造成颗粒内部缺氧区大小变化进而从整体上表现出对系统同步脱氮除磷性能的影响,较低的DO浓度更有利于系统的稳定运行,当DO浓度控制在1mg/L左右时,颗粒污泥系统对COD、氨氮、总氮及磷酸盐的去除率均在90%以上;进水碳氮比减小,导致厌氧段胞内储存物质(PHB)的合成不足,造成好氧聚磷和反硝化聚磷对PHB的竞争,系统同步脱氮除磷性能下降;而序批式颗粒污泥系统泥龄的控制应从平衡排泥除磷以及保持足够颗粒污泥数量维持系统正常运行综合考虑进行操作。     

SBR法处理广东地区城市污水的最优工况

针对广东地区城市污水有机物浓度偏低,碳、氮、磷比例不合理的特点,通过用SBR法处理广东地区城市污水的试验,研究确定了在去除有机物的同时,脱氮除磷所需的最优工况：厌氧反应1h,曝气反应2～3h,沉淀时间为0．8～1h,污泥龄为17～21d．     

HRT和载体对一体化生物膜反应器脱氮除磷效果的影响

根据生物脱氮除磷原理,设计了一体化生物膜反应器,用于生活污水的处理。在一体化生物膜反应器处理生活污水连续运行基础上研究水力停留时间(HRT)和载体对反应器脱氮除磷效果的影响,同时通过分析微生物群落变化对系统脱氮过程进行探讨。试验结果表明:载体特性对反应器脱氮除磷效果影响显著;HRT为9 h时,载体B 4反应器总氮去除率为68.9%;好氧区HRT是限制系统脱氮效果的主要因素。由于载体的作用反应器好氧区存在着好氧缺氧微环境的交替,从而实现了好氧区同步硝化反硝化的脱氮过程。     

序批式反应器脱氮除磷工艺的实验研究

为提高污水脱氮除磷的效率,降低运行成本,对SBR脱氮除磷工艺进行了研究.采用"进水-搅拌-曝气-沉淀-排泥-闲置"的SBR运行模式,在运行工况下通过对COD、氨氮、总磷去除效果的考察来探讨污泥质量浓度、缺氧/好氧时间、p H、溶解氧与脱氮除磷和有机物去除之间的关系,并确定最佳运行条件.实验结果表明,当污泥质量浓度为3 255 mg/L,脱氮除磷效果最好,COD、总磷、氨氮的去除率分别为73.33%、98.90%、85.90%;缺氧阶段p H先快速下降后缓慢下降,聚磷菌大量释磷,在厌氧2.5 h释磷效果达到最佳;在好氧阶段,溶解氧控制在1.05~1.09 mg/L,结合实际情况确定最佳好氧时间为4.0 h.     

HRT和载体对一体化生物膜反应器脱氮除磷效果的影响

根据生物脱氮除磷原理,设计了一体化生物膜反应器,用于生活污水的处理。在一体化生物膜反应器处理生活污水连续运行基础上研究水力停留时间(HRT)和载体对反应器脱氮除磷效果的影响,同时通过分析微生物群落变化对系统脱氮过程进行探讨。试验结果表明:载体特性对反应器脱氮除磷效果影响显著;HRT为9h时,载体B4反应器总氮去除率为68.9%;好氧区HRT是限制系统脱氮效果的主要因素。由于载体的作用反应器好氧区存在着好氧缺氧微环境的交替,从而实现了好氧区同步硝化反硝化的脱氮过程。     

A2O活性污泥工艺去除污水中雌激素的试验

试验研究了厌氧-缺氧-好氧(A2O)活性污泥工艺对雌二醇(E2)和乙炔雌二醇(EE2)的去除性能.基于同时去除雌激素和脱氮除磷的考虑,对A2O工艺的部分运行参数如水力停留时间、污泥龄和混合液回流比进行优化.试验结果表明,A2O工艺对污水中雌激素有较强的去除能力.在温度为20 ℃、污泥回流比为100%的情况下,除磷脱氮和去除雌激素最佳的工艺运行参数为:水力停留时间8 h,污泥龄20 d,混合液回流比300%.此时,总氮,PO3-4-P,COD的去除率分别达到81%,95%,84%;E2降到检测限以下,厌氧、缺氧、好氧池各段对E2的去除量分别占总去除量的72%,6%,22%;EE2的去除率大于80%,厌氧、缺氧、好氧各反应池对EE2的去除量分别占总去除量的45%,21%,34%.     

A2/O工艺中HRT对系统脱氮除磷效率的影响

水力停留时间是制约A2/O工艺的关键因素,直接影响系统的脱氮除磷效率.本试验采用了50 L的A2/O实验装置处理人工模拟生活污水,考察了不同水力停留时间(Hydraulic Residence Time.HRT)对A2/O工艺脱氮除磷的影响,实验结果表明,在厌氧:缺氧:好氧体积比为1∶1∶2,污泥回流比为75％,混合液...     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that