共查询到20条相似文献,搜索用时 86 毫秒
1.
2.
高锰酸盐复合药剂预氧化处理松花江水的效果及机理 总被引:4,自引:0,他引:4
探讨了高锰酸盐复合药剂对春季时期松花江水的处理效果,采用流动电流检测技术研究了其电动特性,并用絮凝脉动颗粒检测技术对絮凝过程进行监测。试验结果表明,对于春季松花江水,单独投加混凝剂,不能有效去除浊度,投量过大还可能使浊度、色度等指标升高;投加高锰酸盐复合药剂对其进行强化处理后,可使沉后水浊度显著降低,对色度、CODMn也有较好的去除效果;投加高锰酸盐复合药剂使流动电流值SC升高,表明高锰酸盐复合药剂是通过氧化作用,降低了胶体颗粒表面负电性,使胶体稳定性降低,从而有利于混凝剂对胶体的絮凝作用;对絮凝过程的监测结果表明,高锰酸盐复合药剂强化了混凝过程,絮体形成快,絮体粒径大. 相似文献
3.
4.
采用磁铁砂加载絮凝技术处理低温低浊海水。通过混凝杯罐实验,研究探索了絮凝过程的最佳工艺参数,考察对比了磁铁砂加载絮凝与FeCl3混凝的处理效果。结果表明,混凝剂选用FeCl3、投加量为15 mg/L,磁铁砂粒径为75~125μm、投量为40 mg/L,以先投混凝剂、1 min后投加磁铁砂的顺序进行磁铁砂加载絮凝,可有效去除低温低浊海水中的SS、浊度和有机物。在混凝过程中,以磁铁砂为内核形成了紧密的磁性复合絮体,产生了电性中和、静电及磁场吸附作用,发挥了微砂加载絮凝和磁絮凝的双重优势。与FeCl3混凝相比,不仅处理效果提高,而且药耗减少、沉淀时间缩短、沉降絮体体积压缩,极具应用价值。 相似文献
5.
6.
考察了现阶段燃煤电厂脱硫废水常用水处理药剂聚合氯化铝(PAC)与聚丙烯酰胺(PAM)联合用于预处理脱硫废水时,药剂的离子形态、絮凝剂选择、药剂投加量、反应转速、溶液pH对絮凝效果的影响及其影响机理。絮凝试验结果表明,非离子形态PAM在低投加量情况下的絮凝效果优于C-PAM和A-PAM;相较于PAFC、PAFS、PFS等絮凝剂,PAC的絮凝效果较好,且其与PAM质量比为10∶1、pH=8、转速为250 r/min条件下,除浊率达99.3%,此时上清液浊度为30.2 NTU,SS值为58 mg/L,可满足脱硫废水水质指标中对SS的出水要求。 相似文献
7.
磁絮凝技术深度处理焦化废水的试验研究 总被引:2,自引:0,他引:2
采用磁絮凝技术对焦化废水生化出水进行试验研究,以CODCr、氨氮、浊度去除率为考察指标,讨论了聚合硫酸铁(PFS)投加量、聚丙烯酰胺(PAM)投加量、磁粉投加量、沉降时间、投加方式等因素对处理效果的影响。结果表明:先投加磁粉,再投加PFS,最后加絮凝剂PAM的投加方式最好,磁粉最佳投加量为400 mg/L,PFS最佳投加量为800 mg/L,PAM最佳投加量为8 mg/L,最佳沉降时间为20 min。CODCr、氨氮、浊度去除率分别达到62.5%、22.3%和92.2%。采用该技术既可提高絮凝效果,又缩短了沉降时间,有很好的现实意义。 相似文献
8.
采用磁絮凝技术处理高悬浮物矿井水,研究了混凝剂、絮凝剂、磁种投加量、磁种浸泡p H值、沉淀时间和搅拌强度对出水效果的影响,并使用MFC+Open CV对絮体分形结构进行分析。结果表明,最佳混凝剂为PAC,投加量60 mg/L;最佳絮凝剂为阴离子PAM,投加量4 mg/L;一级、二级、三级反应池最佳搅拌强度分别为300、200、100r/min;磁种投加前应在中性或碱性溶液中浸泡,磁种的投加显著缩短沉淀时间,15 s内水中絮体即可沉淀完毕,出水浊度去除率达95%以上;磁絮凝絮体分形维数1.692 55,R2为0.9720 6。 相似文献
9.
通过小试模拟中置式高密度沉淀池工艺运行过程,研究了多种可变影响因素对有外部循环污泥的高效絮凝沉淀工艺的影响特性。研究结果表明,活性污泥的投加显著地提高了原水的脱稳效果和颗粒絮凝效果。同时,对于除浊而言,存在一个合适的污泥投加量范围;混凝剂投加量对浑浊度去除有较大的影响,且该工艺下混凝剂投加量增大降低了出水中有机物的含量;试验中较低的聚丙烯酰胺(PAM)投加量即能改善出水浑浊度,随着PAM投加量的增大,出水浑浊度反而升高,当PAM在泥和水中的投加比例为1∶1时,出水浑浊度为最优。同时,采用正交实验考察了不同因素对高效絮凝沉淀工艺的处理效果的影响程度,分析得出影响试验出水浑浊度的显著性顺序依次为:聚合氯化铁投加量>机械絮凝搅拌转速>活性污泥投加量>PAM投加量。 相似文献
10.
论文采用聚合氯化铝(PAC)和阴离子聚丙烯酰胺(PAM)两种絮凝剂,研究了二者协同絮凝埃洛石的行为,通过浊度,红外光谱和絮团显微结构的观察,分析了二者协同絮凝埃洛石的机制.PAC+ PAM协同作用适宜絮凝条件为:药剂总浓度3.33 kg/t,药剂配比PAC∶ PAM =3∶1,搅拌时间90 s,沉降时间10 min.结果 表明,先加入PAC可压缩埃洛石表面双电层,同时架桥作用产生小絮团;后加入PAM,PAM大分子链条可与多个PAC产生的小絮团和埃洛石连接,生成大絮团,发挥了网捕卷扫作用;PAC与PAM复配使用,有效将二者优点结合,与单独使用情况相比,可以在保证絮凝效果的同时,有效降低药剂用量. 相似文献
11.
12.
13.
14.
15.
The transport properties of ionic liquids (ILs) are crucial properties in view of their applications in electrochem-ical devices. One of the most important advantages of ILs is that their chemical–physical properties and conse-quently their bulk performances can be well tuned by optimizing the chemical structures of their ions. This will require elucidating the structural features of the ions that fundamentally determine the characteristics of the nanostructures and the viscosities of ILs. Here we showed for the first time that the“rigidity”, the order, and the compactness of the three-dimensional ionic networks generated by the anions and the cation head groups determine the formation and the sizes of the nanostructures in the apolar domains of ILs. We also found that the properties of ionic networks are governed by the conformational flexibility and the symmetry of the anion and/or the cation head group. The thermal stability of the nanostructures of ILs was shown to be con-trolled by the sensitivity of the conformational equilibrium of the anion to the change of temperature. We showed that the viscosity of ILs is strongly related to the symmetry and the flexibility of the constitute ions rather than to the size of the nanostructures of ILs. Therefore, the characteristics of the nanostructures and the viscosities of ILs, especially the thermal stability of the nanostructures, can be fine-tuned by tailoring the symmetry and the conformational flexibility of the anion. 相似文献
16.
18.
磷尾矿中元素赋存状态研究方法的探讨 总被引:3,自引:0,他引:3
对磷尾矿中元素赋存状态的一些研究方法进行了讨论,通过讨论对磷尾矿的综合研究、合理开发利用、重新设计选冶工艺流程等领域都具有十分重要的意义。 相似文献
19.
20.
Claver IP Zhang H Li Q Zhu K Zhou H 《International journal of molecular sciences》2010,11(8):3002-3015
Starches were isolated from soaked and malted sorghum and studied to understand their physicochemical and functional properties. The swelling power (SP) and the water solubility index (WSI) of both starches were nearly similar at temperatures below 50 °C, but at more than 50 °C, the starch isolated from malted sorghum showed lower SP and high WSI than those isolated from raw and soaked sorghum. The pasting properties of starches determined by rapid visco-analyzer (RVA) showed that malted sorghum starch had a lower viscosity peak value (86 BU/RVU) than raw sorghum starch (454 BU/RVU). For both sorghum, X-ray diffractograms exhibited an A-type diffraction pattern, typical of cereal starches and the relative degrees of crystallinity ranged from 9.62 to 15.50%. Differential scanning calorimetry (DSC) revealed that raw sorghum starch showed an endotherm with a peak temperature (Tp) at 78.06 °C and gelatinization enthalpies of 2.83 J/g whereas five-day malted sorghum starch had a Tp at 47.22 °C and gelatinization enthalpies of 2.06 J/g. Storage modulus (G') and loss modulus (G″) of all starch suspensions increased steeply to a maximum at 70 °C and then decreased with continuous heating. The structural analysis of malted sorghum starch showed porosity on the granule's surface susceptible to the amylolysis. The results showed that physicochemical and functional properties of sorghum starches are influenced by soaking and malting methods. 相似文献