磁性树脂对煤加压气化废水的预处理

发布时间：2018-03-13 06:05

本文选题：煤加压气化废水　切入点：磁性树脂　出处：《昆明理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：中国是一个“富煤、少油、有气”的国家,总煤炭储备达1145亿吨,且分布广泛,品种齐全,而其中褐煤现占很大比例。褐煤存在热值低、湿度大、燃点低和二氧化碳排放量大等缺点,所以采用煤加压气化工艺制取煤气能有效缓解现在的能源紧张问题,尤其是鲁奇加压气化工艺。但煤加压气化工艺会产生大量的煤加压气化废水,废水水质复杂、氨氮高、酚含量大、COD高、可生化性差、毒性高、色度大,属典型的难降解有机工业废水。其中的多环芳烃、酚、氨氮会对人体及环境造成严重危害。所以近年来煤气化工艺中产生的废水又成为制约煤气化工艺发展的一个瓶颈。因此,找到一种高效经济的处理方法对社会、环境和经济都具有十分重要的意义。与传统树脂相比,磁性树脂具有粒径更小,传质更快,易分离,不易随水流失,不仅有离子交换作用,还有氢键作用、π-π作用、阳离子-π作用等优点,近年来越来越多的学者致力于磁性树脂的开发与研究,但目前的学者的研究都是应用于低浓度水体中大分子污染物的去除,基于磁性树脂的优点,其对高浓度水体中大分子污染物的去除也应具有较大的潜力,本研究就是探索磁性树脂在高浓度水体中的应用潜力。本研究选用南京大学自主开发研制的磁性树脂NDMP对实际废水中的主要有机物及发色物质的吸附机理进行研究,以及对实际废水的处理情况的研究。理论试验结果表明,NDMP树脂对苯酚、间甲酚、喹啉、吡啶的吸附基本在5min内达到吸附平衡,对于铁氰化钾的平衡吸附时间为10min；这五种物质更适于使用Freundlich模型进行描述；pH对苯酚和间甲酚的影响较大,但对喹啉和吡啶几乎无影响,对铁氰化钾的影响较小；苯酚、间甲酚、喹啉、吡啶物间存在着竞争吸附；NDMP树脂对铁氰化钾溶液的脱色性能良好；不同再生液对NDMP树脂的再生效果差异较大,其中1%NaCl混合1%NaOH的再生效果最好。实际废水的试验表明：NDMP树脂对煤加压气化废水的COD有较好的去除效果,pH对其影响较大,去除率呈先增后降的趋势,在pH=10时达到最大；NDMP树脂的投加量和吸附时间与COD去除量成正比；NDMP树脂既能吸附废水中小分子物质,也能有效去除废水中大分子物质；NDMP树脂对废水色度的去除效果显著,对于实际废水,其色度能从3200降到400,对于经5000D超滤膜处理的废水,其色度能降到64；对于处理煤加压气化废水,NDMP树脂有较好的稳定性,且对废水COD的去除量较大,对废水COD的平均去除量为2845mg/L。
[Abstract]:Chinese is a rich coal, less oil and gas "countries, the total coal reserves of 1145 tons, and widely distributed, complete varieties, which accounted for a large proportion. The lignite lignite has low calorific value, high humidity, low ignition and disadvantages of carbon dioxide emissions is large, so the use of coal gasification process the gas can effectively alleviate the energy shortage problem now, especially the Lurgi gasification process. But coal gasification of coal gasification process will produce large amounts of waste water, waste water complex, high ammonia, phenol content, high COD, poor biodegradability and high toxicity, high colority, belong to typical refractory organic industrial wastewater. Polycyclic aromatic hydrocarbons, phenol, ammonia will cause serious harm to human health and environment. So the wastewater produced in recent years coal gasification process has become a bottleneck restricting the development of coal gasification process. Therefore, to find an efficient and economical treatment Law of society, have very important sense of environment and economy. Compared with the traditional magnetic resin, resin has a smaller size, faster mass transfer, easy separation, not with the loss of water, not only has the effect of ion exchange, and hydrogen bonding interaction, Cation-n effect and other advantages, research and development more and more scholars committed to magnetic resins in recent years, but the current research scholars are applied to the removal of macromolecules in low concentration of pollutants in water, the advantages of magnetic resin based on the molecular high concentration of pollutants in water removal should also have greater potential, this study is to explore the potential application of magnetic resin in high concentration in water. The adsorption mechanism of Nanjing University developed magnetic resin NDMP developed on the main organic wastewater and chromogenic substances were studied, and the treatment of actual wastewater The study of theory. Experimental results show that the NDMP resin for phenol, m-cresol, quinoline, pyridine adsorption in 5min reached adsorption equilibrium, the equilibrium adsorption time of potassium ferricyanide was 10min; the five material is more suitable for the use of Freundlich model is described; the effect of pH on phenol and m-cresol is larger, but the quinoline and pyridine had almost no effect, little influence on potassium ferricyanide; phenol, m-cresol, quinoline, pyridine compounds exist in competitive adsorption; decolorization of NDMP resin on the potassium ferricyanide solution is good; the difference regeneration effects of different regeneration liquid on NDMP resin is larger, the best regeneration effect of 1%NaCl hybrid 1%NaOH shows that the test. The actual wastewater: NDMP resin for coal gasification wastewater COD has a good removal effect, pH has great influence on the removal rate was first increased and then decreased, reached the maximum at pH=10; NDMP tree Lipid dosage and adsorption time and COD removal is proportional to the amount; NDMP resin can adsorb wastewater of small molecular substances, can effectively remove macromolecular substances in wastewater; removal of chroma of NDMP resin significantly, for the actual wastewater, the color can be reduced from 3200 to 400, the waste water by 5000D super membrane treatment, the color can be reduced to 64; for the treatment of coal gasification wastewater, NDMP resin has good stability, and the removal rate of wastewater COD is larger, the average COD removal amount of wastewater is 2845mg/L.

【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X784

【参考文献】