分置式膜生物反应器应用于城市污水回用中试研究

采用中试规模的(处理水量为1.5t/h)缺氧-好氧(anoxic-oxic process,A/O)分置式膜生物反应器(membrane Bio-reactor,MBR)处理回用城市污水.试验结果表明,系统对化学需氧量(chemical oxygen demand,COD)的去除率达到90%以上,对氨氮(NH3N)的去除率达到95%以上,出水COD的质量浓度小于20 mg/L、NH3-N的质量浓度小于1 mg/L,浊度小于0.1 NTU,且无色、无悬浮物(suspended solid,SS)及大肠杆菌检出,系统出水水质完全符合城市污水再生利用、城市杂用水和城市污水再生利用景观环境用水水质标准.     

MB(A2/O)反应器处理城市污水

研制了将MBR和A2/O工艺相结合的新型MB(A2/O)反应器,研究了MB(A2/O)反应器对城市污水的处理效果,并分析了其性能和机理.结果表明:出水COD小于20mg/L,平均去除率达93.80%;NH3-N质量浓度小于8mg/L,去除率可达88.42%;TN质量浓度小于30mg/L,去除率达46.05%;TP质量浓度小于0.3mg/L,去除率达94.70%.试验表明,MB(A2/O)反应器在保留对其他污染物良好去除效果的同时,对TP有极高的去除率,处理后水质满足<城市污水再生利用城市杂用水水质>(GB/T 18920-2002)的要求.     

两段BAF处理生活污水中试研究

采用两段曝气生物滤池处理生活污水进行了试验研究,探讨了不同的水力停留时间(HRT)对处理效果的影响.结果表明:HRT为1～4 h时,进水COD质量浓度98～154.2 mg/L 的条件下,COD的去除率平均为74.1%,SS的去除率平均为84.5%,NH3-N去除率平均为55.4%,出水COD降至18.6～50.4 mg/ L,SS降至4.8～14 mg/ L,NH3-N降至1.7～28.4 mg/ L;发现NH3-N随着HRT变化较大,COD和TSS变化不显著.同时对第二段生物滤池内生物相特征进行了深入研究,并试验出该系统处理生活污水各段最佳的反冲洗周期.     

阜新市区污水化学强化处理效果分析

采用碱式氯化铝、硫酸铁、硫酸亚铁、聚丙烯酞胺为试验药剂,对城市污水进行强化一级处理.分析了pH值对SS及COD去除率的影响.试验结果表明:对以COD与SS为去除对象的城市污水,采用碱式氯化铝效果最好,投药量为60 mg/L时,SS与COD去除率分别为90 %, . 80%以上.     

一体式膜生物反应器处理中药废水的试验研究

针对中药废水具有COD高,水质变化大等特点,采用一体式膜生物反应器(MBR)对中药废水的厌氧反应器出水进行处理,在固定水力停留时间(HRT)为5 h的条件下,考察了进水COD质量浓度及污泥质量浓度(MLSS)与COD去除之间的关系.结果表明,当HRT为5 h,进水COD质量浓度小于3 000 mg/L时,膜出水COD小于30 mg/L,满足中水回用标准;当进水COD质量浓度为3 000～6 000 mg/L时,膜出水COD大于30 mg/L而小于100 mg/L,满足污水排放标准;当进水COD质量浓度大于6 000 mg/L,膜出水COD大于100 mg/L,不能满足污水排放标准.同时污泥质量浓度(MLSS)与COD去除的关系表明,为了达到更好的COD去除率,MBR的最佳MLSS应控制在7 543 mg/L.     

螺旋流气提式内循环反应器的COD、SS去除效能

为提高气提式内循环反应器三相分离的效率,在反应器中加入螺旋式三相分离器对其进行了改造,并通过试验对其效能进行分析.试验结果表明,改造后的螺旋流气提式内循环反应器对有机物质仍具有较高的去除能力,同时系统出水SS得到了较好的降低.试验从填料体积、水力停留时间、曝气量三个因素分别考查了系统的COD、SS去除效果,系统运行稳定后COD的平均去除率为80%以上,出水COD基本维持在50～60mg/L,系统出水SS值低于30mg/L,从而证实了对气提式内循环反应改造的最初设想.     

混凝-过滤法处理壮骨粉生产废水的实验研究

研究了利用不同混凝剂处理壮骨粉生产废水的最佳工艺条件。结果表明 ,选用聚合硫酸铁铝 ( PAFS)比较适宜 ,其最佳投加量为 2 0 0 mg/L ,适宜 p H值为 7～ 8,此时COD的去除率为 72 .1 %。上清液再经双层滤料柱过滤 ,COD和 SS的总去除率可分别达到 94.9%和 91 .8% ,出水 COD、SS和 p H均达到国家排放标准     

混凝沉淀-IC-BIOFOR处理高浓度乳酸废水

用混凝沉淀-IC-BIOFOR处理高浓度乳酸废水,当进水COD在10 000～13 000 mg/L、BOD5在4 000～5 500 mg/L、SS在5 000～8 000 mg/L时,出水COD、BOD5、SS分别小于100 mg/L、20 mg/L、70 mg/L,COD、BOD5、SS的去除率分别超过99%、99%、98%。色度由1 100倍降低到30倍;出水各项指标达到《污水综合排放标准》(GB8978-1996)一级标准要求。     

膜生物反应器处理一种食品防腐剂生产废水的研究

利用浸没式膜生物反应器(SMBR)对某食品防腐剂生产废水处理进行了研究.重点考察了进水COD浓度、水力停留时间、溶解氧等各种因素对处理效果的影响.试验研究表明:当进水COD浓度小于3400mg/L,水力停留时间(HRT)不低于7h,同时保证温度不低于150C,DO不低于2.0mg/L时,SMBR对COD的平均去除率高于90%,出水COD均小于100ms/L,可基本实现达标排放.     

低浓度氨氮污水厌氧氨氧化影响因素试验

针对我国城市污水氨氮浓度低、碳源不足的特征及处理出水难以达标的情况,采用序批式生物反应器(SBR)研究低浓度氨氮条件下厌氧氨氧化反应途径及其影响因素.采用自配进水.经过5个月的厌氧运行,成功启动了厌氧氨氧化反应器.在稳定运行期,NH4 -N平均去除率这94.5%;NO2--N平均去除率达97.4%.在此基础上,研究了pH值、温度及化学需氧量(COD)对厌氧氨氧化反应过程的影响,并确定各因素的最佳控制范围.研究结果表明:在低质量浓度氨氮(NH4 -N～12 mg/L)条件下,厌氧氨氧化反应pH值为7.5～8.0、温度为30～35℃、COD为0～50 mg/L时反应达到最佳状态,为我国低浓度氨氮城市污水的生物脱氮提供了新的途径.     

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