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1.
移动床生物膜反应器处理低浓度污水的性能   总被引:16,自引:0,他引:16  
研究了MBBR(移动床生物膜反应器)处理低浓度生活污水时启动和运行的性能和特点,通过微镜和扫描电镜观察了反应器中的微生物构成和形态,并且考察了悬浮污泥与填料生物膜之间的关系。试验中用填料充填比为25%的MBBR处理COD质量浓度在100mg/L左右的生活污水,水力停留时间1.9h,COD去除率可以达到85%,出水BOD5质量浓度一般都小于5mg/L。  相似文献   

2.
本文在研究水力停留时间对反应器处理污水的效果影响时认为,只要反应器内的污泥浓度高于2500mg/L以上,水力停留时间为8h、5h、2h时,反应器对COD、氨氮的去除率分别为91~99%和90~100%,对TN的去除率分别为10.78~34.9%、15.7~43.6%、21.6~54%。  相似文献   

3.
采用连续式超声反应器耦合曝气生物填料塔处理印染废水厂一级出水;实验分析对比了不同组合工艺对废水COD和色度去除情况。试验结果表明,采用生物处理→(超声+活性炭)处理→生物处理组合工艺对印染废水的处理效果最好。在进水COD为600-1000 mg/L,色度为320倍的条件下,先经生物处理7h后,再用60 kHz、80 kHz、100 kHz、125 kHz四组频率组合连续超声反应器协同活性炭处理2h(总输入电功率2000W,活性炭用量10g/L),最后再经生物处理20h,出水COD和色度的去除率分别可达90%和95%,达到GB 4287-1992一级排放标准。  相似文献   

4.
生物接触氧化法处理富马酸废水   总被引:6,自引:0,他引:6  
采用好氧生物膜接触氧化法处理富马酸废水,用盾式纤维填料作为生物的支持物,研究生物降解富马酸的原理和不同工艺条件对富马酸废水降解的影响.实验结果表明,富马酸的降解符合一级反应规律,最佳的反应气水比为16,控制水力停留时间为8h.当富马酸废水COD和BOD,分别增至l800mg/L和520mg/L时,处理后的废水的COD约为216mg/L,BOD,约为114mg/L,BOD,与COD的比值为0.53.在反应器容积负荷提高到原来的7.6倍,运行40h后,COD去除率约可恢复到70%,表明生物膜接触氧化反应器具有较大的缓冲能力,其抗冲击负荷能力较强。  相似文献   

5.
影响MBR处理高盐废水效果的因素研究   总被引:2,自引:0,他引:2  
周文 《科技信息》2009,(4):47-48
本文采用MBR工艺对高盐度废水处理的影响因素进行研究。试验条件如下:污水中海水比例为50%,COD为700-800mg/L,氨氮为80-100mg/L。分别研究了DO、HRT、MLSS对COD和氨氮去除率的影响。试验结果表明:在高盐度争件下,控制DO为1-2mg/L、HRT为12h、MLSS为7-8g/L时,COD和氨氮的平均去除率可分别达到91.91%和91.44%。  相似文献   

6.
外加碳源和生物激活剂对生物膜修复污染河水效果的影响   总被引:6,自引:0,他引:6  
考察了低浓度葡萄糖、乙醇和生物激活剂对生物膜修复污染河水的影响。结果表明,3种药剂对生物膜去除污染河水的COD均有明显强化作用,葡萄糖的强化作用最为明显。在22~31℃,河水流量为10L/h、气水比为10:1(V/V)时,与空白相比,加入4.5mg/L的葡萄糖可使COD去除率提高50.3%,河水COD可由地表水V类水质变为I类水质。加入5mg/L乙醇可使COD去除率提高18.5%。在16~20℃、其他条件不变时,加入3mg/L的生物激活剂可使COD去除率提高17.9%。但3种药剂对于氨氮的去除意义不大,加入4.5mg/L葡萄糖后氨氮的去除率只提高7.7%。加入5mg/L乙醇后氨氮的去除率略有下降,加入3mg/L生物激活剂后,氨氮去除率略有提高。  相似文献   

7.
采用水解酸化——SBR工艺处理焦化废水,进水水质为COD1 100mg/L,NH3-N210mg/L时,水解酸化4h,SBR曝气8h,搅拌3h,再曝气4h,沉降1.5h,出水COD68.2mg/L,NH3-N 51.2mg/L,去除率分别达到93.8%,75.6%.  相似文献   

8.
研究了膜生物反应器处理生活污水的运行效果、膜污染特征及控制.结果表明:膜生物反应器处理生活污水,COD的去除率达到85%以上,出水COD质量浓度控制在34mg/L,NH4-N的去除率能达到92%,出水NH4-N质量浓度在5mg/L,出水TN平均去除率可迭86%,出水TN质量浓度为8mg/L;污泥浓度随处理时间延长而逐渐增加,污泥负荷运渐降低.运行初期过膜压力(TMP)的上升较慢,而运行一段时间后,TMP快速上升.对污染后的膜组件进行清洗,结果表明:通过清水清洗和HCl清洗后,膜的过膜压力没有明显缓解,采用NaOH和NaClO联合清洗后,膜的过膜压力迅速下降。说明膜污染以有机污染为主.对TMP进行计算,有机污染在膜污染中贡献为65%,对膜表面无机元素的分析结果也表明,无机污染不是膜污染的主要原因.  相似文献   

9.
新型生物反应器对微污染水预处理的试验研究   总被引:2,自引:0,他引:2  
综合当前生物技术优势,设计开发了一种新型旋转式生物填料反应器,对微污染原水进行了预处理的试验研究。结果表明,当原水D0为4.1—4.7mg/L,CODMn浓度为7—10mg/L,NH3-N浓度为1.2—3.5mg/L时,经过预处理,D0增加列6.20—6.89mg/L;复氧率平均为48.1%;CODMn,NH3-N的去除率分别为36.5%,53.1%,由此表明此种填料的生物反应器对微污染原水有良好的处理效果。  相似文献   

10.
以普通絮状活性污泥为接种污泥,采用人工配制的模拟生活污水,通过逐步缩短沉降时间的方法,在SBAR中成功地培养出了成熟的好氧颗粒污泥。颗粒污泥的SVI为19.97mL/g,粒径在0.45~2.0mm之间,平均沉降速率为45.62m/h,SOUR为47.68g/kg·h,均优于普通絮状污泥。通过扫描电镜观察,颗粒污泥表面粗糙,轮廓清晰,分布着一些沟壑和微小孔道,微生物以杆菌和球菌为主。研究表明,该好氧颗粒污泥反应器具有良好的去除COD和NH4^+-N的能力,去除率分别达到93%和98%以上,对TP的去除率也达到了60%左右。  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.
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   

16.
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   

17.
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   

18.
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   

19.
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   

20.
The non-orthogonal localized molecular orbital(NOLMO)is the most localized representation of electronic degrees of freedom.As such,NOLMOs are thus potentially the most efficient for linear scaling calculations of electronic structures for large systems.However,direct ab initio calculations with NOLMO have not been fully implemented and widely used,partly because of the slow convergence issue in the optimization of NOLMO.We devel-  相似文献   

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