多面球填料塔的氨吹脱传质速率的影响因素

以钒冶炼厂高浓度氨氮废水为处理对象,设计由多面球填料吹脱塔、吸收塔(填科体积均为1 m3)和吹脱空气、废水、吸收液循环管道系统构成的氨吹脱系统,研究氨氮废水的循环流量、温度与pH,吸收液循环流量和pH以及吹脱空气循环流量等因素对氨氮吹脱速率的影响,得到不同条件下氨的总液相传质系数.研究结果表明:在最佳条件下,氨的总液相传质系数KL=7.2 mm/h.     

吹脱法处理高浓度氨氮废水

运用吹脱法处理催化剂生产过程中产生的含(NH4)2SO4高浓度氨氮废水,考察了吹脱时间、废水pH、吹脱温度等因素对氨氮最大脱除率的影响.结果表明,当废水pH为11.5,吹脱温度为80℃,吹脱时间为120min,废水中氨氮脱除率可达99.2%.在此基础上探索了吹脱法脱除氨氮的工业装置操作的吹脱温度和气液比对废水氨氮脱除率的影响,适宜的操作工艺条件是:废水pH 11.5,吹脱温度为80℃,气液体积比300.     

吹脱法对垃圾渗滤液中氨氮去除效果

针对垃圾渗滤液中的氨氮对后续生物处理的严重抑制问题,利用渗滤液废水作为研究对象,采用吹脱法对氨氮进行前期去除,本文主要通过实验研究吹脱条件中pH值、吹脱时间和气液比对吹脱效率的影响,确定了在操作过程中的最佳吹脱条件,对氨氮的去除效率能达到55%~65%,减小对后续的生物处理过程的不利因素.     

吹脱法对垃圾渗滤液中的氨氮预处理研究

针对垃圾渗滤液中的氨氮对后续生物处理的严重抑制问题,利用渗滤液废水作为研究对象,采用吹脱法对氨氮进行前期去除。本研究主要通过实验研究生石灰施加量、吹脱时间和气液比对氨氮吹脱效率的影响,确定最佳生石灰投加量。结果表明,生石灰投加量在12.37g/L时,pH值达到11.5;并在吹脱过程中保持气液比为125倍和9h的吹脱时间作为最佳操作条件。     

超声吹脱技术处理ADC发泡剂缩合废水中的氨氮

ADC发泡剂缩合废水属于高浓度氨氮废水,含有大量的生物难降解物质及生物毒性物质.采用吹脱法考察了pH值、温度、曝气量和曝气气体对氨氮去除率的影响,并在此基础上引入超声波技术处理废水,实验结果表明在pH为10,温度为30℃,超声功率为400W,曝气量1.0L.min-1条件下,超声吹脱处理180min后氨氮的去除率达到92%以上.     

氨氮吹脱效率影响因素

为了研究不同因素对氨氮吹脱效率的影响程度以及最佳工艺运行参数,采用填料为排列规整的聚丙烯阶梯环的吹脱塔进行正交吹脱试验.试验结果表明,氨氮吹脱效率的影响因素顺序为：pH〉气液比〉水力负荷〉氨氮负荷;在水温为27-30℃、气温为25-27℃、进水氨氮负荷为24.46-80.38 kg/m2.m3,pH=11.0、气液比为3 300、水力负荷为2.25 m3/m2.h时,能得到较好的吹脱效果,出水氨氮浓度均低于20 mg/L,氨氮去除率均能达到98%以上.     

空气吹脱法在生活垃圾渗滤液氨氮脱除中的实验研究

采集生活垃圾填埋场渗滤液样品,用10%石灰乳和10%NaOH溶液调节pH值至8.0,9.0,10.0,11.0,12.0,13.0后,用鼓风空气吹脱法进行氨氮脱除实验。结果表明,在常温、曝气量为10L/min、曝气强度为30m3/(m2.h)条件下,将渗滤液的pH值提高至10.0~11.0后再进行吹脱,有利于氨从渗滤液中逸出,吹脱后pH值下降为9.0。当pH值为11.0,气液比为2000~2500,吹脱时间为150min时,渗滤液中的氨氮去除率大于90%。渗滤液中氨氮的去除与CODcr的去除无直接关系。     

响应曲面法优化硅藻土/TiO2制备及深度处理氨氮废水

为深度降解废水中的氨氮,以纳米TiO2和硅藻土为原料,利用化学沉淀法制备硅藻土负载TiO2纳米材料.在单因素设计和试验基础上,采用Box-Behnken响应曲面法,以氨氮(NH3-N)去除率为响应值建立数学模型,分析影响催化剂降解氨氮废水的多种因素.模型优化结果显示:在焙烧温度500℃,焙烧时间3h和负载量5g条件下,制备得到的负载催化剂具有最佳的去除效果,氨氮去除率为73.11%.验证试验进一步验证了建立的响应曲面在负载催化剂制备工艺优化中的有效性.     

氨吹脱/投炭SBR处理垃圾渗滤液

以南京市某生活垃圾填埋场渗滤液为研究对象,采用氨吹脱/投炭SBR/混凝沉淀工艺处理小型生活垃圾填埋场渗滤液.试验中研究了氨吹脱单元中pH值、气液比对氨氮去除的影响,探讨了投炭SBR单元中粉末活性炭浓度对COD去除率,进水氨氮浓度对氨氮及COD去除率的影响.全流程试验结果表明:该工艺对COD、BOD5、氨氮的去除率分别为89.9%,94.0%,98.7%,出水水质达到了《生活垃圾填埋场污染控制标准》(GB 16889-1997)的Ⅱ级排放标准.两级氨吹脱与投炭SBR组合工艺处理低有机物浓度的小型生活垃圾填埋场渗滤液,在技术上是可行的.     

NaCl改性沸石去除废水中氨氮的条件优化研究

通过实验考察了沸石粒径、投加量、废水pH和吸附时间对NaCl改性沸石去除废水中氨氮的影响,结合单因子实验和正交实验获得优化条件组合,并在优化组合条件下,将NaCl改性沸石去除氨氮效果在实际废水中进行验证.结果表明,粒径越小越利于NaCl改性沸石对废水中氨氮的去除,而投加量、废水pH和吸附时间亦对改性沸石去除氨氮产生影响,通过正交优化实验分析得出,最主要影响因素为沸石投加量,结合单因子实验,筛选出改性沸石去除废水中氨氮的最佳工艺组合条件为沸石粒径60目、沸石投加量70g/L、废水pH=6、吸附时间1h,废水中氨氮去除率达到90.5%.在最佳工艺组合条件下,NaCl改性沸石对生活污水、养猪废水和化工工业废水中氨氮的去除率分别为91.67%、91.65%和89.31%,与在模拟废水中的去除率基本一致.这为改性沸石的进一步实际应用奠定了基础.     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.