混凝深度处理造纸废水的试验研究

为了提高造纸废水二级生化处理后出水的水质,采用混凝技术对该废水进行深度处理,考察pH值、混凝剂和絮凝剂种类及投加量等对处理性能的影响。结果表明,最佳运行参数:聚合氯化铝(PAC)投加量为140mg/L,pH值为8,COD去除率和脱色率分别为29.1%和60%;复合絮凝剂阳离子聚丙烯酰胺(CPAM)最优投加量为2mg/L,COD去除率和脱色率分别为35.7%和67.1%;复合脱色剂最优投加量为4mg/L,COD去除率和脱色率分别为44.1%和77.2%。最终出水COD和色度达到了造纸行业水污染物排放标准,为混凝深度处理造纸废水的工艺优化提供了理论依据,有利于该技术的推广应用。     

含酚废水的太阳光/Fenton氧化预处理技术

研究了模拟含酚废水的太阳光/Fenton 氧化预处理技术.结果表明,含酚废水经过适当程度的太阳光/Fenton氧化预处理后,不仅可去除废水的部分COD,还可显著提高废水的混凝性能及可生化性.COD为710.4 mg/L的苯酚废水,直接进行混凝处理时,COD的去除率仅为14.3%,单纯采用太阳光/Fenton氧化处理(氧化剂H2O2的用量为150mg/L)时COD去除率为32%,而采用太阳光/Fenton氧化预处理— 混凝法联合工艺处理后,COD的去除率可达到62.1%,远大于单纯混凝与单纯太阳光/Fenton氧化处理效果之和.实验结果还表明适当程度的太阳光/Fenton 氧化预处理可明显提高苯酚废水的可生化性,使废水的 BOD5/CODCr比值由0.10提高到0.32.     

Fenton试剂氧化处理拆弹炸药废水

本实验使用Fenton试剂对炸药废水进行处理时,通过考察反应时间、双氧水用量、硫酸亚铁用量、pH 以及反应温度对炸药废水TOC去除率的影响,同时应用正交实验设计确定Fenton试剂处理炸药废水的最佳操作条件. 结果表明,随着反应时间的延长,TOC的去除率增大,最佳反应时间为70 min,之后趋于平衡;当双氧水(30%)用量为70 mL/L、FeSO4用量为600 mg/L、pH为3、反应温度25℃时去除率最高,达到92.06%.调节pH值后去除率达96.23%, TNT含量1.8 mg/L.     

混凝沉淀试验对马铃薯淀粉废水处理的研究

通过混凝沉淀试验,用混凝剂聚合氯化铝PAC和助凝剂聚丙烯酰胺PAM复合预处理马铃薯淀粉废水,研究了pH值、PAC用量和PAM用量3因素对混凝效果的影响。结果表明,在pH为5左右,PAC用量为6g/l,PAM用量为0.4g/l条件下,废水的处理效果较为理想,COD去除率达41.7%,蛋白去除率达82.8%,减轻了后续处理系统的负担。     

超声预处理强化印染废水的生物降解性

文章以合肥某纺织厂的实际印染废水为处理对象,将超声波技术作为生化处理的预处理步骤,提高废水的可生化性,与混凝、厌氧生化处理单元组合,优化出一套印染废水的处理工艺.实验结果表明, CODCr质量浓度为1 000～1 500 mg/L的实际印染废水被稀释2倍,超声1 h的反应条件下,废水的CODB/COD值提高了19.7%,且经过组合工艺混凝沉淀-超声-SBR-混凝沉淀处理,出水水质的CODCr去除率达96%以上.     

壳聚糖絮凝剂对焦化废水生化出水的COD去除研究

采用壳聚糖对经过A/O生物处理后的焦化废水进行深度处理,考察pH值和投药量对混凝作用的影响。焦化废水生化出水的CODCr为367 mg·L-1,浊度为44 NTU,色度为75。通过对不同pH值(4~10)的混凝实验可以看出,当pH值为6时相同投药量下焦化废水生化出水的色度、浊度以及CODCr去除率达到最佳。当絮凝剂的投药量达到10 mg·L-1时各项指标的去除率最高,其色度、浊度和CODCr去除率分别为66.67%、50%和68%。最终出水达到了国家排放标准。     

混凝沉降法及Fenton氧化法预处理脱模剂废水的研究

分别采用混凝法和Fenton氧化法对齿轮生产车间脱模剂废水进行预处理,旨在降低其COD浓度,提高其可生化性,为后续生化处理做铺垫.混凝法使用FeCl3、PAC和复合混凝剂进行实验,经各项参数比对得出,在PAC投加量为1 400mg/L,原水pH调至7.0,沉淀时间为40min时,废水的COD去除率最高,可达96.8%.通过Fenton氧化实验得出,在H2O2投加量为6.6g/L,H2O2/Fe2+为10,原水pH调至3.0,反应时间为60min时,处理效果最好,COD去除率为88.4%.可见对于此类废水,在最佳条件下,选用混凝法处理效果更佳.     

Fenton试剂法处理造纸废水的应用研究

用Fenton法对造纸废水进行处理研究,讨论了处理造纸废水的影响因素:pH值,H2O2的用量,Fe2+投入量, 搅拌时间,搅拌速度以及光照时间等对CODcr去除率的影响,得到最佳工艺条件:pH=6.00,H2O2(30%)的用量为8. 34 mL/L,FeSO4投入量为6.67 g/L,搅拌速度为280 r/min,紫外光照80 min后废水的CODCr去除率达85.3%,出水CODcr降到350 mg/L,达到国家造纸废水排放标准.     

大孔树脂吸附法处理印染废水的研究

研究了大孔树脂吸附法处理直接红印染废水.考察了废水pH值、废水浓度、吸附时间和吸附剂用量对色度和浓度去除率的影响.结果表明:在pH值为8,废水浓度为9mg/L,反应时间为2小时,100ml废水中吸附剂用量为3g时,废水的色度去除率为93.9%,浓度去除率为97.9%.大孔树脂的重复使用性能良好.     

强化混凝预处理生物性污染实验室废水

考察了三种典型无机高分子混凝剂聚合氯化铝(PAC),聚合硫酸铁(PFS),聚合双酸铁(PAFCS),以及CaO/LAS摩尔比,助凝剂聚丙烯酰胺(PAM)、温度和pH条件对于强化混凝预处理生物性污染实验室废水效果的影响.实验结果表明:PAFCS处理效果最佳,在最大COD去除率时去除每kgCOD所需的PAFCS用量为PAC和PFS用量的1/6;去除每kgCOD所需的PAFCS药剂成本为PAC或PFS的1/5.确定PAFFS40 mg·L-1,CaO/LAS摩尔比0.75,PAM 1 mg·L-1,温度25℃,pH7为最佳反应条件,此时COD,LAS的去除率可分别达58%和53%,细菌和ATP去除率均为90%以上.     

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。     

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.