给水污泥改良剩余污泥沉降性能研究

城市污水厂剩余污泥脱水前需要投加铁系和铝系等无机混凝剂以增强其脱水性能^[1],净水厂生产过程中也要使用无机混凝剂,故排泥水中存在一定量的剩余混凝剂^[2]。     

彩管废水处理中的污泥减量技术

为解决工业废水处理工艺中出现的沉淀效果不佳、污泥松散问题,采用PTEO混凝剂与污泥回流技术相结合的压载强化絮凝工艺--PTEO压载絮凝工艺,对深圳赛格彩管厂生产废水处理工艺进行改造,并分析该工艺的产泥状况、出水水质,探讨了PTEO的作用机理.实例表明,平均污泥产率为1.04kg/m3,较Al2(SO4)3、FeCl3和高分子混凝剂(PAC、PAFC)的污泥产率分别降低63.2%、59.4%和58.2%;出水中悬浮物(SS)平均值为4.5 mg/L,氟离子质量浓度平均值为5.3 mg/L,基本达到地面水Ⅳ类水质标准.结果证明,该工艺在污泥减量化技术研究方面取得了较大进展.     

基于骨架构建体污泥脱水及其固化土工性能研究

以含水率为98.5%的污泥为研究对象,添加粉煤灰、生石灰等无机复合调理剂进行改性处理,研究其对泥饼固化体的比阻、含水率、最大干密度、渗透系数和无侧限抗压强度等性能的影响。结果表明,添加的粉煤灰和石灰起到骨架构建体作用,处理污泥的比阻从原污泥的109 s2/g降至107 s2/g,显著改善了污泥脱水性能。在不外掺水泥等其他固化剂的条件下,脱水后的泥饼固化体7d无侧限抗压强度大于100kPa,具有优良的固化土工性能。     

新型絮凝剂聚合氯化铝钙的混凝应用研究

研究以Al2O3和CaCO3为原料用高温焙烧酸溶工艺合成聚合氯化铝钙，以某钢铁公司煤气洗涤废水为处理对象研究其混凝应用性能．主要以悬浮物去除率，污泥比阻处理效果为指标，比较新型絮凝剂的混凝效果．结果显示：新工艺制备的聚合氯化铝钙混凝效果优于工业聚铝，处理废水后污泥的脱水性能优于工业聚铝处理后的污泥脱水性能．     

氯化铝对脱水污泥超临界水气化产氢的影响

如何选择或开发合适的催化剂以提高产氢量成为污泥超临界水气化技术,是实现实际应用的关键。选取氯化铝(AlCl_3)作为催化剂,以污水厂脱水污泥为对象,采用间歇式高温高压反应釜,在400℃、24 MPa、30 min的条件下进行超临界水催化气化实验。分析AlCl_3对脱水污泥超临界水气化产氢以及关键产物的影响,探讨AlCl_3的催化机理。结果表明,AlCl_3能够显著促进脱水污泥超临界水气化产氢,在6wt%添加量下氢气产率达到11.52 mol/kg OM,比不添加提高了近43倍。AlCl_3的添加会促进小分子有机物聚合生成酚类物质,抑制小分子聚合生成焦炭。AlCl_3催化机理是水解生成HCl和A_l2(OH)_3。HCl作为酸性水解剂,促进污泥中碳水化合物在亚临界条件下水热解转化成小分子物质,并进一步在超临界条件下气化产生氢气;Al_2(OH)_3作为碱性化合物催化剂,促进水气转化反应促进产氢,二者共同作用促进脱水污泥超临界水气化产氢。     

阳离子聚丙烯酰胺用于污泥脱水的研究

污泥脱水是废水处理过程中的重要环节。传统的投加无机絮凝剂的方法由于其产泥量大、脱水率不高,目前已逐渐被高分子的有机絮凝剂所取代。分析了PAM-C的污泥脱水原理,阐述了阳离子聚丙烯酰胺用于污泥脱水的脱水性能。     

超声辅助污泥脱水的研究

为了研究超声对污泥脱水性能的影响，在污泥板框压滤实验中，利用超声结合絮凝剂聚丙烯酰胺（PAM）处理污泥的方法，对比了有无超声对污泥压滤脱水的效果。研究结果表明：超声可以降低污泥含水率，使其从最初含水率近98％减少到81％，污泥的体积减少为最初的1／10。超声声强为410W／m^2、超声处理时N2．5 min为较优处理条件；同时絮凝剂的使用量，从0．7％（干基）降至0．6％（干基）。     

微污染原水强化混凝处理技术研究

为提高南方某水厂常规工艺对微污染原水的净化效率,以聚合氯化铝(PAC)为混凝剂,分别采用预氧化(KMnO4、H2O2和O3)、粉末活性炭、助凝剂(PAM)和回流污泥等技术强化微污染原水的混凝过程.结果表明:预氧化强化混凝把原水中有机物氧化分解为分子量较小、疏亲水性较高的有机物,进而提高有机物混凝去除效果,KMnO4、H2O2和O3的适合投加量分别为1.5～2、4～6和4～6 mg/L;粉末活性炭强化混凝是利用粉末活性炭吸附分子量在0.6～3 kD的有机物,从而提高CODMn和色度去除率,粉末活性炭的适合投加量为20～30 mg/L;助凝剂强化混凝是助凝剂PAM能有效提高絮体颗粒尺寸,使得颗粒沉降速度加快,并使CODMn去除率得到提高,PAM投加量为0.2 mg/L;污泥强化混凝沉淀是以回流污泥提供凝聚核心,充分发挥其吸附、卷扫的作用,提高CODMn去除率,污泥适当投加量为15 mg/L.     

工业石膏在自来水厂污泥调解和脱水中的作用

自来水厂污泥的处理和利用是一个至今没有得到完全解决的问题,通常的做法是将其直接排放或脱水后填埋.在实验研究的基础上,论述了采用工业石膏(CaSO4·2H2O)和有机聚合物对自来水厂污泥进行双重调解进而脱水的方法.实验结果表明,用11(工业石膏和有机聚合物的重量比)的投量对自来水厂污泥进行双重调解可明显改善污泥的过滤性能.脱水实验证明双重调解后的污泥经机械脱水,其泥饼含水率可比单纯有机聚合物调解后脱水的泥饼含水率低大约7个百分点.此项研究的意义在于探索自来水厂污泥脱水后农用及作为人工湿地填料的可能性,同时也为自来水厂污泥脱水后的最终处置探索新思路.     

助滤剂强化剩余污泥脱水技术研究

研究了不同类型助滤剂对城市污水处理厂剩余污泥的脱水效果。研究发现,单加无机型助滤剂对剩余污泥的脱水效果优于有机型和表面活性剂型助滤剂,但是沉降性较差。助滤剂ST和阳离子PAM的复配可以大幅度降低泥饼的含水率。当ST用量为2g／L、阳离子PAM用量为0.3％时,泥饼的含水率为75．36％,与不加助滤剂相比,泥饼的含水率降低了12．99％。     

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.     

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.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.     

The Analects and the Moment in Peking——The influence of a Confucian education system on the personality formation,the way of thinking and the fate of the main characters

0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation＇s behavior in their social life throughout the long history is beyond list.