共查询到20条相似文献，搜索用时 640 毫秒
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利用生石灰-FeCl3体系对硫酸生产的废水进行除砷除氟试验研究，探讨了pH值、三价铁Fe(Ⅲ）浓度、混凝搅拌时间、静置时间等因素对As、F去除率的影响．研究结果表明，当pH=10，三价铁Fe(Ⅲ)浓度为60mg／L、混凝搅拌时间为5min、静置时间为20min时，As、F去除率分别达96.0％和86．6％，废水中残余As、F浓度分别为0.39mg／L和9．9mg／L，均达到国家排放标准． 相似文献
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采用聚合硫酸铝铁(PFSA)对城市污水处理厂生化出水混凝除磷,考察PFSA投加量对磷和出水pH的影响,污水pH、沉淀时间对混凝除磷效果的影响.同时进行了聚合硫酸铁(PFS)、硫酸铝的混凝除磷比较实验.结果表明,聚合硫酸铁铝(PFSA)具有对出水pH的影响较小,对磷去除率高,pH值适用范围宽的优势.PFSA在投加量为6.0mL/L时,沉淀时间为40min时,出水磷0.24mg/L,磷去除率可以达到84%,出水满足辽宁省污水综合排放标准(DB2008). 相似文献
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采用中和-混凝法处理三氯氢硅生产中的尾气洗涤废水.实验确定的最佳工艺条件:中和后的悬浮液pH为7～9,混凝剂聚合氯化铝投加质量浓度为30 mg· L-1,快速搅拌30 min,慢速搅拌40 min,静置60 min.结果表明:在最佳工艺条件下对该废水进行处理,出水无色透明,浊度和悬浮物(SS)去除率都在97％以上,SiO2去除率在92％以上,可全部返回洗涤系统循环使用. 相似文献
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通过烧杯试验,分别对Al2（SO4）3· 18H2O,Fe2（SO4）3,聚合Al2O3以及1∶1组合无机絮凝剂（Al/Fe）对高浓度垃圾渗滤液的除磷效果进行了研究,结果表明当pH值相同,静沉50min,投药量为700mg/L时,1∶1组合絮凝剂的除磷效率高于单独使用无机絮凝剂,TP去除率为95.12％.处理后出水TP浓度小于1.5mg/L,达到GB16889-2008一级标准. 相似文献
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叶彩华 《Journal of Zhangzhou Technical Institute》2008,10(2):19-22
用红外光谱法对以环氧氯丙烷作交联剂制各的交联壳聚糖进行表征,并用氢化物发生-原子吸收光谱法研究其对水中As（Ⅲ）的吸附行为。实验探讨了pH值、吸附时间、吸附剂用量、As（m）初始浓度和体积等因素对交联壳聚糖吸附As（Ⅲ）的吸附率的影响。结果表明,在pH=3．0、As（Ⅲ）初始浓度30ng／mL、吸附时间15min、吸附剂用量50mg、溶液体积50mL时,交联壳聚糖对As（Ⅲ）的吸附率可达81．9％,饱和吸附量为51．43ng／mg,As（Ⅲ）浓度降至5．43ng／mL以下。 相似文献
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FeAPO-11分子筛催化氧化水溶液中苯酚的性能 总被引：1，自引：0，他引：1
以水热晶化法合成了铁磷铝分子筛FeAPO-11,并用X射线衍射分析(XRD)、扫描电镜(SEM)、紫外-可见光漫反射(UV-Vis)等对样品进行了表征,结果表明,所合成的FeAPO-11分子筛样品结晶度高,且Fe3 进入到了分子筛骨架中.进而研究了以FeAPO-11为催化剂,H2O2为氧化剂对水溶液中苯酚的催化氧化性能:在苯酚初始浓度质量200 mg/L、H2O2添加量1200 mg/L、pH值5.0、处理温度60℃、处理时间240min时,苯酚去除率达到88.72%,总有机碳(TOC)去除率达52.5%,析出到溶液中的Fe3 浓度为0.213 mg/L.重复性实验表明,催化剂的稳定性较好. 相似文献
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《实验室研究与探索》2019,(9)
以某小型封闭黑臭水体为对象,研究了高铁酸钾(K_2FeO_4)与粒状活性炭(GAC)协同强化混凝修复黑臭水体的最佳工艺参数和处理效果。采用响应曲面法建立了以氨氮(NH3-N)和化学需氧量(COD)的去除率为响应值的二次回归模型,对两者协同作用时K_2FeO_4投加量、预氧化时间、GAC的投加量和pH值4个影响因子进行优化。结果表明:回归模型极其显著,对NH3-N去除效果的影响显著程度排序为:K_2FeO_4投加量 pH GAC投加量 K_2FeO_4预氧化时间;对COD去除效果的影响显著程度排序:GAC投加量 K_2FeO_4投加量 pH K_2FeO_4预氧化时间。K_2FeO_4最佳投加量1. 036 mg/L,最佳预氧化时间10. 159 min,GAC最佳投加量16. 152 mg/L,最佳pH值7. 362,此时NH_3-N和COD的去除率分别达到了85. 500%和69. 262%。模型预测值与实验验证结果的实际误差小于5%。 相似文献
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研究了以聚合硫酸铁(PFS)为主凝剂、高取代度季铵型阳离子化玉米淀粉(HQCC)为助凝剂处理城市生活废水的各种影响因素．实验结果表明：PFS和HQCCS分别以200mg／L和10mg／L的复配浓度、pH值接近中性时混凝效果为最佳，CODCr去除率达到80％，色度与浊度去除率均达99％以上． 相似文献
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翟建 《十堰职业技术学院学报》2010,23(1):89-92
采用MAP沉淀法预处理高浓度氨氮废水,以MgCl2·6H20、Na2HPO4·12H2O为沉淀剂,研究了该方法脱氮的主要影响因素,得出最佳工艺条件,在室温条件下,pH值为7.25左右,反应摩尔比n(Mg2+)∶n(NH4+)∶n(PO43-)为1.2∶1∶1.1,反应20 min,静置30 min,对于氨氮浓度大于3 000 mg/L的废水,氨氮去除率平均可以达到98%以上。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献