共查询到17条相似文献,搜索用时 140 毫秒
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原位合成层状双氢氧化物处理含镍废水 总被引:3,自引:0,他引:3
利用配制的含镍模拟废水,研究了金属离子在层状双氢氧化物(layer double hydroxide,LDH)结构中的嵌入作用和利用原位合成LDH方法处理含重金属废水的可行性.通过单因素实验和正交实验,研究了pH值、温度、Mg2 与Al3 的摩尔比值对镍去除率的影响.结果表明:影响镍离子去除效率的因素主要是Mg2 与Al3 的摩尔比、pH值及镍离子初始浓度,且主次关系为pH值>Ni2 初始浓度>Mg与Al摩尔比.当pH在8.5,Mg2 /Al3 比值为1~2时,镍离子去除率最高,Mg2 ,Al3 利用率也较高.同时沉淀出的固体样品经X射线衍射和红外图谱分析证实为LDH晶体结构,Ni2 取代了部分Mg2 嵌入到LDH的八面体层板中. 相似文献
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化学沉淀法脱氮工艺条件和甲胺废水中氨氮去除的研究 总被引:1,自引:0,他引:1
采用化学沉淀法去除废水中的高浓度氨氮,试验结果表明:在最佳工艺条件pH=10.1、n(Mg):n(N):n(P)=1.4:1.0:1.1下,氨氮的去除率在95%以上.进而采用化学沉淀法对甲胺模拟废水氨氮去除情况进行研究,得出氨氮去除率达到90%时去除一甲胺废水的最佳工艺条件为pH=10.5、n(Mg):n(N):n(P)=1.1:1.0:1-0,此时废水中一甲胺的质量浓度必须小于等于528mg/L. 相似文献
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实时合成含铅类水滑石处理含铅废水的研究 总被引:1,自引:0,他引:1
在模拟的含铅废水中同时加入Mg2+和Al3+,以NaOH和Na2CO3为沉淀剂,在Mg2+、Al3+共沉淀过程中Ph2+能部分取代Mg2+实时制备含铅类水滑石,并达到同时去除铅离子的目的。探讨了nMg+Pb/nAl、nPb/n[Mg+Pb]、pH值、晶化时间、铅初始浓度对去除率的影响。当n[Mg+Pb/nAl、nPb/n[Mg+Pb]为4和0.2,pH值为8-10,晶化时间12h以上,初始浓度在1000mg/L以下,铅去除率高达97%以上。XRD、Fr-IR对沉淀产物结构分析证实,实时合成的产物为含铅类水滑石。 相似文献
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《净水技术》2019,(3)
采用了共沉淀法去除水中的高浓度氯离子,主要是通过向模拟高氯废水中加入Ca(OH)_2和NaAlO_2,使其与水中的氯离子发生沉淀反应,并将沉淀物从水中分离去除。以水样中氯离子去除率作为主要指标,通过单因素试验研究了共沉淀法去除氯离子的主要影响因素和最佳反应条件,并用扫描电子显微镜(SEM)和X射线衍射(XRD)对生成的沉淀物进行形貌、结构分析。结果表明:当反应时间为1.5 h、反应温度为25℃、n(Ca~(2+)):n(Al~(3+)):n(Cl~-)=4:2:1时,对于pH值为3~11、Cl~-浓度为1 000~15 000 mg/L的废水均有较好的氯离子去除率,去除率可达70%以上。共沉淀法也可去除SO_4~(2-),当废水中存在SO_4~(2-)时,氯离子去除率降低。 相似文献
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UV/Fenton氧化法对苯酚氧化效果的实验研究 总被引:4,自引:0,他引:4
研究UV/Fenton氧化法中各个因素对降解水中苯酚的影响,确定UV/Fenton法处理苯酚废水的工艺条件。保持UV/Fenton体系的基准条件不变,通过改变H2O2浓度、n(Fe2+)∶n(H2O2)、废水初始pH值等实验条件,考察这些因素对UV/Fenton法处理苯酚废水效果的影响。结果表明:UV/Fen-ton氧化法对苯酚废水有较好的去除效果和较高的反应速率。当废水初始pH值为3.0时,经30 min的反应,苯酚去除率达到99%,COD去除率达到86%。但是苯酚废水COD去除率滞后于苯酚去除率。UV/Fenton法能够在较短的时间内去除苯酚和COD,H2O2浓度、n(Fe2+)∶n(H2O2)对处理效果影响较大,H2O2浓度决定苯酚去除率和COD去除率,而n(Fe2+)∶n(H2O2)是影响降解速率的主导因素。 相似文献
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泡沫浮选法处理含氰废水 总被引:1,自引:0,他引:1
本文研究了在含氰废水中按化学计量比加入Fe~(2+)和Fe~(3+)离子以生成无毒的亚铁氰化铁絮状物沉淀,然后采用泡沫浮选进行分离的除氰方法。操作过程中拟加入一定量的阳离子表面活性剂,采用5~#烧结玻璃板作气体分布器,在pH值为4.0~6.5之间,能获得较高的分离效率。操作宜在阳光直射不到的阳暗处进行以避免亚铁氰化铁沉淀的光解反应发生。 相似文献
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采用海藻酸钠和3种生物质载体(稻壳、玉米芯、秸秆)固定化的硫酸盐还原菌(SRB)处理单一重金属(700 mg/L Fe2+, 75 mg/L Cu2+, 120 mg/L Pb2+, 80 mg/L Cd2+)废水,筛选出稻壳为效果较优的固定化载体,并对合成重金属废水(含400 mg/L Fe2+, 30 mg/L Cu2+, 50 mg/L Pb2+, 40 mg/L Cd2+)的处理效果作了进一步研究. 结果表明,稻壳固定化SRB去除单一重金属时,Fe2+, Cu2+, Pb2+, Cd2+去除率分别为99%, 100%, 100%, 100%;处理合成重金属废水时,4种重金属去除率分别为98.06%, 100%, 99.35%, 100%. 相似文献
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Layered double hydroxides (LDHs), or so-called anionic clays, consist of cationic brucite-like layers and exchangeable interlayer anions. Because of their biocompatibility, some LDHs, such as Mg/Al, Zn/Al, Fe/Al and Li/Al-LDH, can be used as host materials for drug-LDH host–guest supramolecular structures. The anti-inflammatory drug fenbufen has been intercalated into layered double hydroxides for the first time by co-precipitation under a nitrogen atmosphere. The product has been characterized by powder X-ray diffraction (XRD), FT-IR spectroscopy, elemental analysis and thermogravimetry (TG) and shows an expanded LDH structure, indicating that the drug has been successfully intercalated into LDH. In addition, the dependence of the nature of the fenbufen intercalation process on conditions such as pH value and chemical composition of the host has been systematically investigated. The interlayer distance in the intercalated materials increases with increasing pH value, resulting from a change in the arrangement of interlayer anions from monolayer to interdigitated bilayer. Drug release characteristics of the pillared LDH materials were investigated by a dissolution test in a simulated intestinal fluid (buffer at pH 7.8). The results show that the drug release of supramolecular LDH materials was a slow process, especially in the case of Mg/Al intercalated materials, suggesting that these drug-inorganic hybrid materials can be used as an effective drug delivery system. 相似文献
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为了探讨曝气生物滤池(BAF)对氰化物的去除能力,采用两级曝气生物滤池对含氰废水进行了启动研究。结果表明,当BAF1和BAF2的HRT分别为7 h和5 h、进水温度为20~25 ℃、气水比为10∶1、进水COD为400 mg/L左右(葡萄糖配水)时,随着进水CN?的增加,两级BAF对CN?、COD和TN的去除率逐渐下降。当进水CN?从20.22 mg/L增加到65.23 mg/L时,两级BAF对CN?、COD和TN的去除率相应从92.1%、90.2%和61.7%降至59.1%、53%和25.4%。当初始CN?低于35.34 mg/L时,经过24 h闷曝后,BAF对CN?的去除率可达99%以上,出水CN?低于0.2 mg/L。初始CN?越高,BAF对CN?的降解速率越慢,完全降解CN?所需的时间 越长。 相似文献
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Seung-Jai Kim Ki-Hyun Lim Kwang-Hyun Joo Myung-Jin Lee Sang-Gyu Kil Sung-Yong Cho 《Korean Journal of Chemical Engineering》2002,19(6):1078-1084
Simultaneous removal of heavy metal and cyanide ions in an ion exchange column is studied on the basis of formation of metal-cyanide
complexes at high pH range. Strong base anion exchange resin beads were contacted with water containing heavy metal (Cu, Cd,
Zn) and cyanide ions in semi-fluidized and fluidized beds. Compositions of the heavy metal-cyanide complexes formed for different
heavy metal and cyanide concentrations are used to explain the ion exchange behavior. Ion exchange equilibrium data of this
study were fitted well with the Langmuir isotherm. The ion exchange capacity of CNas metal complexes increased to about three
times that of free cyanide due to higher selectivity of metal complexes on the anion exchange resin. The ion exchange efficiency
of the three heavy metalcyanide systems decreases as the concentration ratio of cyanide and heavy metal increases. The regeneration
rates of the regenerants used was in the order of NaSCN>NaCN>NaOH, and the regeneration rate of NaOH was substantially lower
than other two.
This paper is dedicated to Professor Dong Sup Doh on the occasion of his retirement from Korea University. 相似文献
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介绍了电解-氧化法处理高浓度含氰电镀废水的反应机理、工艺流程和工艺控制方法.应用结果表明,以该方法处理500~20 000 mg/L的高浓度含氰电镀废水,其回收液无CN-和重金属离子,主要成分为H2O,含少量COD和NH3,达到国家二类地区控制标准;每升废水耗能0.17 kW·h,处理成本(不含管理成本)为$1.27元... 相似文献