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1.
自来水厂新型净水剂聚合氯化铁的研究   总被引:2,自引:0,他引:2  
分析了聚合氯化铁的成分,并处理了印染废水。在不同条件下测经处理前后废水的吸光度,计算脱色率,寻找该净水剂的最佳净水条件。实验表明在常温下该净水剂浓度为0.0104mol/L,pH值为8,沉降1h净水效果较好。  相似文献   

2.
凹凸棒石型净水剂处理印染废水的研究   总被引:4,自引:0,他引:4  
本文介绍了凹凸棒石型净水剂处理印染废水的基本原理,研究了凹凸棒石型净水剂处理印染废水的影响因素,确定了粉状凹凸棒石型冷水剂的最佳处理条件。  相似文献   

3.
聚合铁铝净水剂的开发与试用   总被引:1,自引:0,他引:1  
通过对用高岭土制备聚合铁铝净水剂与其它净水剂对选煤污水的对比处理研究 ,并给出了聚合铁铝净水剂与其它净水剂对选煤污水的对比处理结果 ,分析了用高岭土制备聚合铁铝净水剂的经济指标。  相似文献   

4.
文章对辣木籽天然净水剂与常用化学净水剂明矾、聚合氯化铝等净水效果进行比较研究,结果表明:辣木籽有较明显的净水效果,净水效率与聚合氯化铝相当;确定辣木籽净水最佳剂量为100mg/L;辣木籽粗提取液有良好净水效果,但水体中有机物含量有所增加;利用不同倍数蒸馏水与NaCl溶液对辣木籽进行处理,10倍NaCl溶液提取辣木籽,降低浊度的效果明显,同时高锰酸盐指数并未增加,采用不同盐溶液提取辣木籽,对水体浊度去除效果相当。因此,辣木籽作为天然净水剂具有较好的潜在应用价值。  相似文献   

5.
范宁云 《甘肃科技》2005,21(2):48-49
低铁高效净水剂“JH-103”,经对不同原水浊度混凝试验和最佳用药成本计算显示具有用药量少、制水成本低和净水效果优良的特点。在性能和使用效果上均优于聚合硫酸铁、聚合氯化铝、聚合氯化铝铁等无机高分子絮凝剂,是一种新型净水剂。  相似文献   

6.
连雪灵 《科技信息》2010,(25):355-355
利用煤矸石为原料,研究了制备复合铁铝净水剂的最佳工艺条件,从而制得了效果良好的新型净水剂。  相似文献   

7.
风化煤粒状净水剂在印染废水处理中的应用(Ⅱ)   总被引:3,自引:0,他引:3  
系统地测定了风化煤粒状净水剂对常用的活性染料、分散染料、直接染料、士林染料、硫化染料、纳夫妥六大类染料废水的吸附脱色率及最佳吸收 波长,证实了该净水剂对各种染料 的脱色率均可达80%以上。并进上步探讨了其吸附动力学特征,为实现HA净水剂的工业化应用奠定了基础。  相似文献   

8.
风化煤粒状净水剂在印染废水处理中的应用(Ⅰ)   总被引:1,自引:0,他引:1       下载免费PDF全文
用四川南桐风化煤制成粒状腐植酸类净水剂,测定了它对印染废水的静态吸附特性,按优化条件处理印染废水,其脱色率和CODcT去除率均可达75%。  相似文献   

9.
用镀铝铁锌渣制备净水剂,达到以废治废的目的,并采用L9(34)正交试验法研究制备该净水剂的条件,探讨硫酸、盐酸的用量和pH值等条件对净水剂净水效果的影响.结果表明:在w=38%的盐酸用量为30mL,pH值为4.0的最佳条件下,净水剂对浊度的去除率可达98.2%,对色度去除率达到96.7%.  相似文献   

10.
壳聚糖净水剂对Cr(Ⅵ)的吸附研究   总被引:8,自引:0,他引:8  
研究了壳聚糖净水剂在不同浓度、温度、pH的条件下,自水溶液中吸附铬(Ⅵ)的特性.结果表明:固体壳聚糖净水剂对Cr6+有一定的吸附能力,是一种有效的螯合剂,具有较强的螯合和吸附作用,能有效地从工业废水中吸附造成环境污染的重金属离子,是一种有研究前景的应用于废水净化的固态制剂  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

14.
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.  相似文献   

15.
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。  相似文献   

16.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

17.
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.  相似文献   

18.
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.  相似文献   

19.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

20.
1 Rise of studies on climate change's effects on biodiversity
Until the 1980s, climate change and biodiversity were studied as two independent disciplines for more than a century. In 1992, the Ecological Society of America's annual report named climate change, biodiversity, and the sustainable ecological system as the three major global environmental issues of the twenty-first century [1].  相似文献   

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