共查询到18条相似文献,搜索用时 62 毫秒
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《应用化工》2022,(7):1619-1624
采用水溶液合成法,以部分水解聚丙烯酰胺(HPAM)、甲醛和二甲胺为功能单体,硫酸二甲酯为季铵化试剂,制备了具有抗盐性的弱交联超分子絮凝剂。研究了交联度、阳离子度和分子量等对絮凝剂抗盐絮凝性能的影响。结果表明,最佳工艺条件为:HPAM∶二甲胺∶甲醛(物质的量比)为1∶1. 1∶1. 1,阳离子度为14. 8%,分子量为1 500万,体系p H为7,反应温度为60℃,反应时间为6 h。红外光谱结果表明已得到目标产物,扫描电镜和Zeta电位仪结果表明弱交联超分子絮凝剂在高矿化度下能保持一定的分子刚性,并在基本的吸附架桥机理之外,主要靠超分子多点吸附来增强其抗盐性和絮凝效果。将自制的弱交联超分子絮凝剂与市售几种高分子絮凝剂在相同高矿化度下进行比较,自制絮凝剂在抗盐絮凝性方面均有优势。 相似文献
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微生物絮凝剂的絮凝特性研究 总被引:2,自引:0,他引:2
从活性污泥中分离出1株产高效絮凝剂微生物AspergillusM-25,利用其发酵液进行絮凝特性实验。实验结果表明:(1)该絮凝剂对250μm,4g/L,pH为7的高岭土悬浊液有良好的絮凝效果,絮凝率>97%;(2)菌株M-25产生的活性成分95%存在于上清液中,只有约5%存在于洗涤后的菌细胞中,未接种的培养液中不含絮凝成分;⑶影响生物絮凝剂絮凝效果的因素主要有絮凝剂的投加量,高岭土悬浊液的pH、浊度、粒度以及金属离子的添加;⑷利用该生物絮凝剂处理活性炭粉末溶液和土壤悬浊液,也取得较好的处理效果,显示了絮凝范围的广泛性。 相似文献
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煤泥水微生物絮凝剂絮凝机理的研究 总被引:1,自引:0,他引:1
针对望峰岗选煤厂的煤泥水性质特点,并对其进行红外光谱及XRD检测,根据微生物絮凝剂结构和组成,建立了絮凝剂对煤泥水絮凝作用模型,并分析微生物絮凝剂在煤泥水中的作用机理,进而在此基础上剖析煤泥水微生物絮凝剂絮凝机理研究工作中仍然存在的问题,提出煤泥水微生物絮凝剂絮凝机理今后的研究方向。 相似文献
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壳聚糖/蒙脱石复合絮凝剂的絮凝机理研究 总被引:1,自引:0,他引:1
通过对蒙脱石壳聚糖复合絮凝剂进行正交实验,证明不仅二者对絮凝的效果产生极为显著的影响,而且二者的交互作用对絮凝的效果也有极为显著的影响。通过测量复合絮凝剂的Zeta电位,以及处理废水时的扫描电镜图,可以得知复合絮凝剂的电性和分子结构变化,可以初步推断出蒙脱石与壳聚糖在复合絮凝剂中的作用,以及二者交互作用产生的原因。 相似文献
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介绍了近年来微生物絮凝剂发展的概况及其物理化学性质(属性,结构组成,相对分子量和活性基团)和絮凝机理,并重点讨论了其物理化学性质与絮凝机理的关系,提出了微生物絮凝剂絮凝机理的研究方向。 相似文献
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针对吉林油田稠油热采污水中的油含量高和悬浮质含量高,采用絮凝法处理稠油热采污水,并进行高效絮凝剂的筛选.在对含油污水成分分析的基础上,采用烧杯实验和分光光度法研究了絮凝剂的絮凝效果.筛选出了以无机絮凝剂硫酸铝与两性高分子聚合物CE-3090的复配体系,同时研究了影响絮凝效果的因素并探究了其影响机理.结果表明,在温度40℃,pH值7.72,170 r/min高速搅拌1 min,然后50 r/min低速搅拌5 min,硫酸铝的加量90 mg/L,CE-3090的加量0.5 mg/L,絮凝沉降30min后其絮凝效果较好.试验证明该复配处理剂处理含油污水后,含油量和杂质含量都达到了回注回用及排放标准. 相似文献
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Solution viscosity and flocculation characteristics of linear polymeric flocculants in various media
T.O. ChimamkpamM.G. Rasteiro F.A.P. GarciaE. Antunes P. FerreiraD. Hunkeler C. Wandrey 《Chemical Engineering Research and Design》2011,89(7):1037-1044
Rheological characteristics of linear copolymers of acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride (Q9), differing in molar mass and chemical composition, have been studied in distilled water (DW) and industrial water (IW) obtained from a paper mill. For all copolymers, the shear viscosity, μ, was much lower as the ionic strength of the water increased, with near Newtonian behaviour observed at high ionic strengths. In DW, the polymer solutions were yield pseudoplastic. Comparison of the behaviour of all flocculants at the same shear rate in the two media was accomplished by modelling the rheological data.The characteristics of the copolymers could be related with their flocculation performance in IW. The rate of flocculation in the IW was generally higher than in the DW. In general, flocculants with higher charge density were effective at lower concentrations exhibiting a lower value for the optimum PEL dosage. The flocculation data were supported with zeta potential measurements. In all cases flocs break under shear with an inability to recover the floc size with time. Overall, the polyelectrolyte behaviour in flocculation as a function of molar mass, charge density and quality of the medium could be correlated. This is of particular importance for papermaking due to the modern tendencies for water closure. 相似文献
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Simulation of the flocculation process using both inorganic and polymer flocculants is very difficult because there are many factors that influence the process. In this study, a model that enables the visual understanding of the qualitative trends of the flocculation system using both inorganic and polymer flocculants is proposed. It is a simplified one-dimensional model that expresses flocculation under various additive manners of the flocculant. Various kinds of thought experiments as well as experimental runs with model flocculants were carried out based on the model; the results demonstrate that the model can express many empirical qualitative trends of flocculation. 相似文献
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介绍了以溶胶(硅溶胶、铝溶胶、铁溶胶)为基础,以磷、镁、锌、锰和钴等为辅助元素,制备无机微颗粒絮凝剂的方法及其絮凝性能。以自配高岭土水样浊度去除率为评价指标,筛选出了NSAFMnS和NFAC等2种整体性能较为突出的产品。采用加量20 mg/L的NSAFMnS和NFAC处理胜利油田桩西联合站浊度130.47NTU、含油24.13 mg/L的采油污水,浊度去除率分别为75.89%和78.19%,油度去除率分别为78.52%和81.02%;而在相同条件下工业聚合铝的浊度和油度去除率分别为49.11%和57.14%。采用SEM等手段对其结构进行了表征。 相似文献
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采用实验室自制聚硅酸氯化铝铁( PSAFC)与天然有机高分子壳聚糖(CTS)进行复配,制备成新型的无机-有机复合絮凝剂PSAFC -CTS.将该复合絮凝剂应用于蓝藻废水的处理,考察了 PSAFC与CTS的质量比、pH、反应温度及反应时间4个因素对其浊度去除率的影响,优化出最佳合成工艺条件为:m(PSAFC)∶m(CTS) =5∶1,pH为2.5,反应温度为70℃,反应时间为60 min.通过红外光谱和扫描电镜对PSAFC -CTS结构进行表征,结果表明,PSAFC与CTS在反应前后物质结构发生了变化,形成了相互交联成网状的三维新结构,生成了一种新型聚合配位化合物. 相似文献
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采用溶胶-凝胶法制备Fe3O4-PAC磁性絮凝剂,通过投加量和pH值的改变对其絮凝性能进行研究。研究表明,制备磁性絮凝剂的最佳条件是:将4.60 g PAC溶于20 mL的蒸馏水,调节pH=8,超声分散10 min后,加入0.19 g磁性Fe3O4;处理污水时磁絮凝剂的最佳投放量为0.02 g/L,最佳pH=8。 相似文献