共查询到20条相似文献，搜索用时 62 毫秒
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改性硅藻土处理含氟废水的研究 总被引：2，自引：0，他引：2
以改性硅藻土为吸附剂处理工业含氟废水。研究了改性硅藻土用量、pH值、吸附时间等因素对含氟废水中氟的去除效率的影响。结果表明:改性硅藻土加入量为100~150 mg/L,处理时间为60 min,pH值6~9,室温条件下,用氢氧化钠改性并高温活化后的硅藻土对废水中氟离子的去除效果明显优于原土,对含氟废水样的除氟率可达到97%以上,处理后的废水中氟离子浓度达到国家污水排放标准。 相似文献
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利用酸性甲醛溶液将废弃花生壳改性,研究了改性花生壳对Cr（Ⅵ）浓度为50mg/L的模拟水样的静态吸附实验效果。实验结果表明,对于Cr（Ⅵ）浓度为50mg/L的50mL模拟水样,当温度为25℃用粒径为2-3mm改性花生壳吸附剂用量为1.0g、介质pH值为1.0、吸附时间为300min处理废水时,Cr（Ⅵ）的去除率可以达到99.71%。吸附后的水中Cr（Ⅵ）浓度为0.144mg/L,满足《污水综合排放标准》GB8978-1996的要求。改性花生壳比普通花生壳对废水中Cr（Ⅵ）的吸附能力更强。 相似文献
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《南阳师范学院学报》2015,(9):45-48
漯河某医院废水具有水量水质变化大,氮磷含量较高,且排放无规律的特点,采用"特殊废水预处理+巴登福(Bardenpho)同步脱氮除磷二级强化处理工艺+二氧化氯消毒处理"组合工艺处理该废水取得了较好的效果.处理工程规模1000m3/d,进水水质平均浓度为COD 83.3mg/L、BOD528.6mg/L、SS 67mg/L,处理后的出水平均浓度为COD 17.9mg/L、BOD54.89mg/L、SS 9mg/L,平均去除率分别为78.5%、82.9%、86.6%,出水水质达到《医疗机构水污染物排放标准》GB18466-2005中的预处理标准. 相似文献
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钢渣处理含铬废水的研究 总被引：6，自引：0，他引：6
用钢渣处理含铬废水,对处理各工艺参数进行了试验,结果表明,在废水pH值2.5～12,cr3+0～350mg/L,按铬/钢渣重量比为1/35投加钢渣进行处理,铬去除率为99%,处理效果可以达到排放标准. 相似文献
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王军 《赤峰学院学报(自然科学版)》2014,(5):72-74
介绍采用混凝沉淀/电催化/两相厌氧/生物接触氧化处理染料废水的工程实例.运行结果表明,当进水COD、色度、苯胺的浓度分别为14000mg/L、20000倍、120mg/L时,出水相应指标的浓度分别为65mg/L、20倍、0.46mg/L,可达到国家《纺织染整工业水污染物排放标准》(GB4287-92)Ⅰ级标准. 相似文献
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何锦强 《广东轻工职业技术学院学报》2009,8(3):17-20
采用三维电极/Fenton试剂/中和法对广东某包装厂高浓度油漆废水进行处理,实验结果表明：油漆废水通过铁板三维电极在电压18V、极板间距4cm、pH自然和电解3h条件下,COD去除率达67.1%;电解水在H2O2投加量为13mL/L（30%）、Fe^2＋投加量为40mL/L（10%）、反应时间为3h时,COD为109mg/L;将处理水pH调至6-9,出水COD可降至100mg/L以下,达到国家《污水综合排放标准》（GB8978-1996）二级排放标准。 相似文献
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张成书 《安徽科技学院学报》2008,22(5)
对某钣金厂磷化废水采用混凝沉淀法进行处理研究,利用 pH/ORP系统在生产运行中确定了碱和混凝剂的最佳投加量,实现了整个工艺的自动控制,降低了药剂量的使用.结果表明:该法可使原水COD从250mg/L降到50mg/L,总磷从36 mg/L降到0.3mg/L,废水COD和总磷的去除率分别达到80%和99%,达到排放标准. 相似文献
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根据玉米糖废水的水质特点，选择厌氧－好氧主体工艺处理玉米糖废水。运行结果表明：在进水水质为CODCr≤10151mg/L，出水水质达到GB8979－1996《污水综合排放标准》二级标准。该处理工艺对冲击负荷能力强，运行稳定，操作简单，基建和运行费用较低。可推广应用地食品行业高浓度有机废水的处理。 相似文献
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以某太阳电池生产企业车间高氟废水为处理对象,采用La-腐殖酸/Al2O3气凝胶复合物(LHAGC)对二级絮凝后的含氟废水进行深度处理,观察吸附剂投加量、吸附时间和吸附pH对废水中氟化物去除效果的影响,并通过动态实验分析吸附剂对氟化物的动态吸附特征．结果表明：当吸附剂投加量为5g/L,吸附时间为45min,pH范围为5～7时氟化物去除率最高,离子态氟的去除率为80%,总氟化物的去除率为94%,络合态氟的去除率为99%,处理出水中总氟化物低于《电池工业污染物排放标准》(GB30484-2013)的排放限值70%;利用Thomas模型可较好地描述LHAGC对废水中氟化物的动态吸附特征,其饱和吸附量为36.013mg/g. 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献