本文選題：煤氣化廢水 + 磷酸銨鎂��； 參考：《昆明理工大學》2015年碩士論文

【摘要】：隨著能源市場的調(diào)整,煤炭的氣化技術在我國得到快速發(fā)展。但隨著煤氣化產(chǎn)業(yè)的快速發(fā)展,生產(chǎn)過程中產(chǎn)生了大量的煤氣化廢水。煤氣化廢水中含有大量的雜環(huán)、酚類、生物毒性有機物及氨氮。由于廢水中大量難降解有機物的存在,使得微生物的硝化及反硝化作用受到了嚴重抑制,導致生化法除氮效果極差。而磷酸銨鎂結晶法可以避免煤氣化廢水中有機物的生物毒性,可以高效穩(wěn)定的去除廢水中的氨氮。利用磷酸銨鎂法去除煤氣化廢水中的氨氮的運行條件,影響因素及化學污泥的處理是本研究的核心。采用響應面優(yōu)化法、結晶與晶體結構分析、分子量分布法及電滲析系統(tǒng)回收磷酸銨鎂循環(huán)沉氨等技術路線,結合高效液相色譜儀(HPLC)、X射線衍射儀(XRD)、傅里葉紅外光譜儀(FT-IR)等技術手段,進行了磷酸銨鎂鎂去除煤氣化廢水中氨氮條件參數(shù)優(yōu)化、煤氣化廢水中典型有機物及分子量分布對磷酸銨鎂法去除氨氮影響、電滲析法回收磷酸銨鎂循環(huán)沉氨技術條件探究實驗,為磷酸銨鎂法去除廢水中氨氮的實際應用提理論及技術依據(jù),研究結果如下：(1)優(yōu)化了磷酸銨鎂法去除煤氣化廢水中氨氮的技術參數(shù)對磷酸銨鎂法去除煤氣化廢水中氨氮的運行條件情況得到以下結論：最佳的操作條件pH值為9.5,鎂氮比范圍為1.1-1.2,磷氮比范圍為0.8～1.1。極差分析顯示鎂氮比對整個除氮效果的影響最顯著。(2)探究了煤氣化廢水中有機物對磷酸銨鎂法去除氨氮的影響雜環(huán)類和酚類有機物因絡合及吸附作用抑制MAP晶體的形成,且雜環(huán)類有機物的抑制作用大于酚類有機物。對于雜酚類和雜環(huán)類有機物而言,多組分有機物對MAP晶體形成的抑制作用大于單一組分(3)探究了煤氣化廢水中有機物分子量對磷酸銨鎂法除氮影響煤氣化廢水中小于500D的物質(zhì)對磷酸銨鎂法除氮效果產(chǎn)生抑制作用,并導致晶體形狀改變。由于有機物的吸附作用及均相成晶過程,煤氣化廢水中小于500D的有機物是磷酸銨鎂法除氮過程中主要協(xié)同去除的有機物。14)解析了磷酸錢鎂晶體酸解電滲析法回收循環(huán)沉氨技術利用磷酸銨鎂酸解除氨,回收藥劑循環(huán)沉氨等技術路線,開展磷酸銨鎂晶體酸解電滲析回收循環(huán)沉氨技術的研究,研究成果如下：運行條件如下：電流密度的操控范圍是70～80 mA/cm-2,運行時間為2-3h,陰極室的電導率應大于1900 s/cm。此陽離子交換膜的極限電流可以適應通常的電流值,避免了濃差極化和電解水現(xiàn)象的出現(xiàn),降低了磷酸銨鎂回收過程中的電耗。
[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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X784

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