磷酸铵镁法循环去除煤气化废水中氨氮的研究
本文选题:煤气化废水 + 磷酸铵镁 ; 参考:《昆明理工大学》2015年硕士论文
【摘要】:随着能源市场的调整,煤炭的气化技术在我国得到快速发展。但随着煤气化产业的快速发展,生产过程中产生了大量的煤气化废水。煤气化废水中含有大量的杂环、酚类、生物毒性有机物及氨氮。由于废水中大量难降解有机物的存在,使得微生物的硝化及反硝化作用受到了严重抑制,导致生化法除氮效果极差。而磷酸铵镁结晶法可以避免煤气化废水中有机物的生物毒性,可以高效稳定的去除废水中的氨氮。利用磷酸铵镁法去除煤气化废水中的氨氮的运行条件,影响因素及化学污泥的处理是本研究的核心。采用响应面优化法、结晶与晶体结构分析、分子量分布法及电渗析系统回收磷酸铵镁循环沉氨等技术路线,结合高效液相色谱仪(HPLC)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)等技术手段,进行了磷酸铵镁镁去除煤气化废水中氨氮条件参数优化、煤气化废水中典型有机物及分子量分布对磷酸铵镁法去除氨氮影响、电渗析法回收磷酸铵镁循环沉氨技术条件探究实验,为磷酸铵镁法去除废水中氨氮的实际应用提理论及技术依据,研究结果如下:(1)优化了磷酸铵镁法去除煤气化废水中氨氮的技术参数对磷酸铵镁法去除煤气化废水中氨氮的运行条件情况得到以下结论:最佳的操作条件pH值为9.5,镁氮比范围为1.1-1.2,磷氮比范围为0.8~1.1。极差分析显示镁氮比对整个除氮效果的影响最显著。(2)探究了煤气化废水中有机物对磷酸铵镁法去除氨氮的影响杂环类和酚类有机物因络合及吸附作用抑制MAP晶体的形成,且杂环类有机物的抑制作用大于酚类有机物。对于杂酚类和杂环类有机物而言,多组分有机物对MAP晶体形成的抑制作用大于单一组分(3)探究了煤气化废水中有机物分子量对磷酸铵镁法除氮影响煤气化废水中小于500D的物质对磷酸铵镁法除氮效果产生抑制作用,并导致晶体形状改变。由于有机物的吸附作用及均相成晶过程,煤气化废水中小于500D的有机物是磷酸铵镁法除氮过程中主要协同去除的有机物。14)解析了磷酸钱镁晶体酸解电渗析法回收循环沉氨技术利用磷酸铵镁酸解除氨,回收药剂循环沉氨等技术路线,开展磷酸铵镁晶体酸解电渗析回收循环沉氨技术的研究,研究成果如下:运行条件如下:电流密度的操控范围是70~80 mA/cm-2,运行时间为2-3h,阴极室的电导率应大于1900 s/cm。此阳离子交换膜的极限电流可以适应通常的电流值,避免了浓差极化和电解水现象的出现,降低了磷酸铵镁回收过程中的电耗。
[Abstract]:With the adjustment of energy market, coal gasification technology has developed rapidly in China.However, with the rapid development of coal gasification industry, a large amount of coal gasification wastewater is produced in the production process.Coal gasification wastewater contains a lot of heterocycles, phenols, biotoxic organic matter and ammonia nitrogen.Due to the presence of a large number of refractory organic compounds in wastewater, the nitrification and denitrification of microorganisms are seriously inhibited, which leads to the extremely poor effect of biological and chemical methods in nitrogen removal.The crystallization of ammonium magnesium phosphate can avoid the biological toxicity of organic matter in coal gasification wastewater and can remove ammonia nitrogen from the wastewater efficiently and stably.The operation condition of ammonia nitrogen removal from coal gasification wastewater by magnesium ammonium phosphate is the core of this study, and the influencing factors and the treatment of chemical sludge are the core of this study.Response surface optimization method, crystal and crystal structure analysis, molecular weight distribution method and electrodialysis system were used to recover cyclic ammonia precipitation of magnesium ammonium phosphate.Combined with high performance liquid chromatograph (HPLC) and high performance liquid chromatograph (HPLC), X-ray diffractometer (XRDX) and Fourier transform infrared spectroscopy (FTIR), the condition parameters of magnesium magnesium ammonium phosphate for removing ammonia and nitrogen from coal gasification wastewater were optimized.Effects of typical Organic matter and Molecular weight Distribution in Coal Gasification Wastewater on removal of ammonia nitrogen by magnesium ammonium Phosphate process.It is a theoretical and technical basis for the practical application of ammonium magnesium phosphate in the removal of ammonia nitrogen from wastewater.The results are as follows: 1) the technical parameters of ammonia nitrogen removal from coal gasification wastewater by magnesium ammonium phosphate process are optimized. The operating conditions of ammonium magnesium phosphate process for ammonia nitrogen removal from coal gasification wastewater are obtained as follows: the optimal operating conditions are as follows:The range of mg / N ratio and P / N ratio is 1.1-1.2 and 0.8 / 1.1respectively.The effect of organic matter in coal gasification wastewater on the removal of ammonia nitrogen by magnesium phosphate process was investigated. The effect of complexation and adsorption of heterocyclic and phenolic organic compounds on the formation of MAP crystals was investigated.The inhibitory effect of heterocyclic organic compounds was greater than that of phenolic organic compounds.For creosote and heterocyclic organics,The effect of molecular weight of organic compounds on nitrogen removal from coal gasification wastewater by magnesium ammonium phosphate method was studied. The effect of less than 500D in coal gasification wastewater on nitrogen removal by magnesium ammonium phosphate process was investigated.Fruit has an inhibitory effect,And cause the crystal shape to change.Due to the adsorption of organic matter and the homogeneous crystallization process,The organic matter less than 500D in coal gasification wastewater is the main organic matter. 14) in the process of removing nitrogen by magnesium ammonium phosphate.The technology of reclaiming recirculating ammonia from magnesium ammonium phosphate crystal by acid hydrolysis electrodialysis and so on has been studied.The results are as follows: the operating conditions are as follows: the operating range of current density is 70 ~ 80 Ma / cm ~ (-2), the operating time is 2 ~ 3 h, and the conductivity of cathode cell should be greater than 1900 s / cm ~ (-1).The limit current of the cationic exchange membrane can adapt to the usual current value, avoid the phenomenon of concentration polarization and electrolytic water, and reduce the electricity consumption in the recovery process of magnesium ammonium phosphate.
【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
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