共查询到17条相似文献，搜索用时 109 毫秒
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运用正交设计原理,通过具有代表性的试验,研究分析了各因素对泥浆固发离效果的影响,结果表明,影响混凝析主次因素为：混凝剂浓度、加量、搅拌时间。并指出混凝剂选择的方法和应注意的问题,以供工程参考。 相似文献
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针对高悬浮物矿井水,设计了5水平6因素的L25(56)正交混凝试验,并通过极差分析确定了混凝的最优化条件,即选择PAC作为混凝剂,pH值调节为9,混凝剂与助凝剂浓度比为20∶1,助凝剂PAM投加滞后30 s,水力条件依次为n=350 r.min-1快速搅拌30 s,n=120 r.min-1中速搅拌4 min,n=60 r.min-1慢速搅拌6 min。通过单因素分析了6种因素对混凝的影响程度,即:PAM投量>混凝剂种类>pH值>混凝剂投量>水力条件>投加时间。依试验结果,对垂向轴式混合反应池进行了参数设计。 相似文献
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非金属矿物混凝剂的特性和去污混凝机理 总被引：1，自引：0，他引：1
研制了非金属矿物混凝剂。对造纸废水中的化学耗氧量和色度的去除率分别达８０％和９４％;对地表水的浊度去除率达９９．５％,污泥水率降低,沉降速度快。探讨了非金属矿物混凝剂的去污混凝机理。 相似文献
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混凝法用于污水处理的实验研究 总被引：4，自引：2，他引：4
用混凝法处理洗浴污水，并把处理后的水作为中水回用。影响污水处理效果的因素有混凝剂的种类，混凝剂投加量，水力条件等方面。混凝法处理洗浴废水的最佳条件是：选择比较便宜易得的混凝剂（硫酸铝）采用适宜混凝剂浓度（5％），强化混凝反应强度和时间（强搅拌 较长的反应时间），投加适量的混凝剂（90mg/L)。在最佳试验条件下，可以使处理后的洗浴废水达到中水回用标准和生活杂用水标准。 相似文献
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改性铝土矿做净水剂，与市售其它混凝剂比较，具有ＰＨ值适用范围宽，对水中阴阳离子，尤其是对ＳＯ＾２－４的吸附能力强等优点。去除水中的浊度，颜色，ＣＯＤ等同于市售其它混凝剂。 相似文献
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高氟地下水混凝沉淀降氟试验研究 总被引：5，自引：0，他引：5
本文开展了山西运城地区高氟地下水的降氟试验，对聚铁、硫酸铝和明矾等不同混凝剂降氟效果进行对比，探讨了地下水硬度对混凝沉淀除氟效果的影响。实验结果表明：明矾混凝沉降效果优于其它混凝剂，0．3g／L的明矾溶液可使含氟浓度4．0mg／L的地下水降低到浓度1．0mg／L以下；地下水的硬度对明矾混凝降氟效果没有明显影响。 相似文献
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新型混凝剂处理印染废水的实验研究 总被引：5，自引：0，他引：5
采用自行制各的具有不同SiO2:Al:Fe(摩尔比值)和碱化度的两类新型无机高分子混凝剂聚硅酸氯化铝铁(PSAFC)和聚硅酸硫酸铝铁(PSAFS）各7种，直接对印染废水进行处理。从中选出2种温凝剂，考察了pH值、混凝剂投量等对混凝效果的影响，并对混凝处理后，印染废水出水中残留温凝剂主要成分Al、Fe、SiO2的含量进行分析。实验结果表明，氯化物型(PSAFC)和硫酸盐型(PSAFS)混凝剂对印染废水的色度、浊度、COD Cr均有良好的去除效果；总体而言，PSAFS的混凝效果略优于PSAFC；混凝处理后印染废水出水中残留铝、铁、硅的含量均比较低；pH值和碱化度对温凝剂在水体中残留铝含量有影响。 相似文献
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混凝法处理造纸废水的实验研究 总被引：10，自引：0，他引：10
利用以水玻璃、硫酸、硫酸铝和废铁屑为原料研制出的聚硅酸硫酸铝铁类混凝剂，在静态处理造纸废水的基础上，使用自行设计的动态模拟实验装置，对贵州省某造纸厂总排口废水进行温凝处理。在最佳水力条件下，造纸废水色度去除率达96．9％，COD Cr去除率达92．5％，出水水质低于国家造纸工业污染物排放一级标准，说明复合型聚硅酸铝铁类混凝剂对造纸废水有着优异的去除效果。 相似文献
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Z. Liu X. Duan P. Zhan R. Liu F. Nie 《International Journal of Environmental Science and Technology》2017,14(11):2507-2518
A novel magnetic composite coagulant, prepared from nano-Fe3O4 and poly-aluminum chloride, was introduced to pre-treat mature landfill leachate. The coagulation performance of the coagulant as well as its microstructural morphology was discussed. Coagulation experimental results revealed that the coagulation performance of the landfill leachate using the new coagulant was better than that using poly-aluminum chloride alone, with COD and color removals above 60 and 68%, respectively. Based on the analysis of three-dimensional excitation–emission matrix spectrum, the fluorescence signals of treated leachate are totally reduced by the magnetic composite coagulant. The components of dissolved organic matters in the wastewater are removed in different degrees. Fourier transform infrared spectra analysis shows that the magnetic composite coagulant, which is a multi-core polymer with hydroxyl ligands and nano-Fe3O4, has a complex valence and crystal structure. Besides, X-ray diffraction pattern analysis indicates that the chemical composition of the magnetic composite coagulant is not changed significantly, which has comprehensively combined the chemical characteristics of both nano-Fe3O4 and poly-aluminum chloride, whereas the specific surface area of the novel magnetic composite coagulant effectively increased by nano-Fe3O4 particles under the analysis of scanning electron microscope spectral. The specific surface area analysis indicates that the magnetic composite coagulant is interconnected by narrow cracks and holes and has a high specific surface area and developed pore structure, which is also similar to the typical porous-type materials. Therefore, the nano-Fe3O4 compounded with poly-aluminum chloride leads to a larger specific surface, smaller average pore diameter, and more pore volume of the novel coagulant. 相似文献
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A. Mesdaghinia M. T. Rafiee F. Vaezi A. Mahvi A. Torabian A. Ghasri 《International Journal of Environmental Science and Technology》2006,2(4):335-342
Jar-test experiments were conducted to study enhanced coagulation effectiveness in removal of disinfection by products (DBPs) from Zayandehrud River at Isfahan Province-the center part of Iran-in 2004. In this study, the removal of suspended and colloidal particles and natural organic matter (NOM) at various coagulant doses and coagulation pHs was assessed through raw and treated water measurements of turbidity, UV254 absorbance, TOC, and dissolved organic carbon (DOC). The trihalomethane formation potential (THMFP) was also determined by a mathematical relationship with TOC. Results indicated that NOM removal was a function of coagulant type, coagulant dose, and pH of coagulation. In general, TOC, DOC, and UV254 absorbance removal enhanced with increasing coagulant dose. However, further increases in coagulant dosage had little effect on disinfection by-products precursors removal. Ferric chloride was consistently more effective than alum in removing NOM. Coagulation pH was appeared to be a determining factor for maximum NOM removal and the removal of DBPs precursors by enhanced coagulation was significantly enhanced at pH 5.5 in comparison with initial pH of water. Furthermore, it is specified that preadjustment of pH with sulfuric acid reduced the coagulant dosage and thus, production of sludge. The reduction in THMFP was consistent with the trends observed for DBPs precursors removal data (i.e. UV254 and TOC data). 相似文献
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R. J. Banu Ph.D. K. U. Do Ph.D. I. T. Yeom M.Sc. 《International Journal of Environmental Science and Technology》2008,5(1):93-98
The alkalinity plays an important role in phosphorus removal using coagulant. The dosage of coagulant in the low alkalinity wastewater is limited due to rapid pH changes. In the present study, a series of jar test was conducted using low alkalinity wastewater (50 mg/L) to evaluate the optimum pH, dosage and performance parameters (slow mixing and settling time) for the common coagulant alum. From the experiment, it was found that the dosage of coagulant and removal of phosphorus depend upon the pH of the wastewater after adding coagulant. The final optimum pH for efficient P removal was found to be within the range of 5.7–5.9. This range acts as an indicator and it is the maximum tolerable pH range for phosphorus removal for low alkalinity wastewater. The optimum time for slow mix and settling was found to be 20 min. The optimum mole ratio of alum to remove one mole of phosphorous was found to be 2.3. The alum coagulation at pH 7 produced effluent with the total residual phosphorus and reactive phosphorus content of 0.3 and 0.9 mg/L, respectively. 相似文献
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I. Bodlund A. R. Pavankumar R. Chelliah S. Kasi K. Sankaran G. K. Rajarao 《International Journal of Environmental Science and Technology》2014,11(4):873-880
The use of natural coagulant protein in drinking water treatment has been discussed for a long time, though the method is still not in practice, probably due to limited knowledge and availability of material. In the present work, different Mustard varieties were tested for the presence of coagulant protein compared with Moringa seed extract and their potential application in water treatment. The coagulation activity of the protein extract was measured using synthetic clay solution as well as water from pond. The protein content was determined by Bradford method, molecular mass determined by Sodium dodecyl sulfate–polyacrylamide gel electrophoresis, and peptide sequence was analyzed by Mass spectrometry. Extract of Mustard (large) and Moringa seed showed coagulation activity of ?70 and ?85 % after 90 min, respectively. Interestingly, seed extracts from other Mustard varieties had coagulation activity after heat activation at 95 °C for 5 h. However, the coagulation activity of Mustard seed extract against turbid pond water was higher (?60 %) compared to Moringa seed extract (?50 %). The peptide sequence analysis of 6.5 and 9 kDa proteins was found to be homologous to Moringa coagulant protein and napin3, respectively. To our knowledge, this could be the first report on Mustard seed having coagulant protein. The coagulation activity of Mustard (large) against highly turbid pond water suggested that it could be a potential natural coagulant for water treatment. 相似文献
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Effects of initial concentrations of Moringa oleifera seed coagulant for removing Chemical Oxygen Demand and Total Dissolved Solids from municipal solid waste leachate have been evaluated at an optimum pH of 7 and temperature of 318 K. The kinetic data obtained from the experiments were fitted to the pseudo first-order, pseudo second-order, Elovich and intraparticle diffusion models. Based on a regression coefficient (R 2), the equilibrium (kinetic) data were best fitted with the Elovich model (R 2 = 0.993 for Chemical Oxygen Demand and R 2 = 0.996 for Total Dissolved Solids) than that of other models. The results of the kinetic models study indicated that the adsorption capacity of M. oleifera seed as a coagulant for removing Chemical Oxygen Demand and Total Dissolved Solids in a leachate increased up to 100 mg L?1, beyond which the adsorption capacity got reduced. Finally, the present study concluded that M. oleifera seed coagulant could be employed effectively for the removal of Chemical Oxygen Demand and Total Dissolved Solids in a municipal solid waste leachate. 相似文献
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Laboratory and pilot testing of electrocoagulation for removing scale-forming species from industrial process waters 总被引：1，自引：1，他引：0
M. C. Schulz J. C. Baygents Ph.D. J. Farrell Ph.D. 《International Journal of Environmental Science and Technology》2009,6(4):521-526
This study investigated the performance of electrocoagulation using iron and aluminum electrodes for removing silica, calcium and magnesium from cooling tower blowdown and reverse osmosis reject waters. Experiments were conducted at both the bench and pilot scales to determine the levels of target species removal as a function of the coagulant dose. At the bench scale, aluminum removed the target compounds from both cooling tower blowdown and reverse osmosis reject more efficiently than iron. A 2 mM aluminum dose removed 80 % of the silica and 20 to 40 % of the calcium and magnesium. The same iron dose removed only 60 % of the silica and 10 to 20 % of the calcium and magnesium. When operated with iron electrodes, pilot unit performance was comparable to that of the bench unit, which suggests that such systems can be scaled-up on the basis of coagulant dose. However, when operated with aluminum electrodes the pilot unit underperformed the bench unit due to fouling of the electrode surfaces after a few hours of operation. This result was completely unexpected based on the short-term experiments performed using the bench unit. 相似文献
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嗜酸性微生物是一类生活在极端酸性环境下的微生物,已被广泛用于生物冶金。对721铀矿嗜酸性微生物的群落分布规律进行了初步的研究与探讨。运用双层固体平板培养技术,以琼脂糖为凝固剂,以SJH为底层添加菌,分离样品中的微生物．得到8种嗜酸性微生物,根据不同菌在不同双层固体平板表面的菌落形态特征,并结合16SrRNA基因扩增技术鉴定菌种。占优势的嗜酸性微生物为氧化亚铁硫杆菌（Acidithiobacillus ferrooxidans,简称A．f）. 相似文献