复合型生物脱氮技术处理合成氨工业废水

发布时间：2018-06-04 23:23

本文选题：工业废水 + 氨氮　；参考：《中原工学院》2015年硕士论文

【摘要】：水资源是人类赖以生存的自然资源。近年来,由于人类活动的频繁和工业的迅速发展,产生了大量含氨氮的废水。氨氮废水的来源有许多方面,尤其是工业生产中大量高浓度氨氮废水的排放已经成为不可忽视的环境问题。工业合成氨生产过程中产生的氨氮废水,氨氮的质量浓度为400-700mg/L,有的甚至高达1000-2000mg/L。大量未处理含高氨氮废水的排放,造成了水体的富营养化,导致水体中藻类的大量繁殖,水体缺氧,鱼类大量的死亡。如何高效的处理氨氮废水已经成为国内外学者研究的一个方向。本文以某化肥生产企业排放的含氨氮工业废水为研究对象,总结了国内外对含氨氮工业废水的处理技术,并对现有工艺的优缺点进行了分析,结合该企业排放废水的特点,提出了以厌氧氨氧化、短程硝化反硝化和缺氧、好氧相结合的复合型生物脱氮技术为主体的处理工艺流程,即“A/A/O/O+氧化破氰+絮凝+沉淀”组合工艺。本文以上述处理工艺为依据,对该氨氮工业废水进行工程设计,确定了各处理工艺单元的设计参数,经过设计计算得到了水处理构筑物以及配套建筑物的结构尺寸,列出了主要设备配置清单。同时,进行了建筑和公用工程的设计。本工程经过土建施工,设备安装及工艺调试后投入正常运行。通过对处理出水连续取样进行分析,结果显示,当进水CODcr=650mg/L,NH3-N=250mg/L,pH=8左右的水质条件下,出水中的CODcr=45 mg/L、NH3-N=9.2mg/L均能达到《合成氨工业水污染物排放标准》(DB41/538-2008)一级标准的要求。实际运行效果表明本工程采用的复合型生物脱氮技术能有效地去除废水中的氨氮,对NH3-N和CODcr的去除率都达到了90%以上,出水稳定达标,并且CODcr和NH3-N的年平均减排量分别为1551420kg、653700kg。表明以复合型生物脱氮技术为主体的“A/A/O/O+氧化破氰+絮凝+沉淀”组合工艺处理高氨氮工业废水是可行的。
[Abstract]:Water resources are the natural resources on which human beings depend. In recent years, due to the frequent human activities and the rapid development of industry, a large amount of wastewater containing ammonia nitrogen has been produced. The source of ammonia nitrogen wastewater has many aspects, especially the discharge of a large amount of high concentration ammonia nitrogen wastewater in industrial production has become an environmental problem that can not be ignored. The mass concentration of ammonia nitrogen in the wastewater from industrial ammonia production is 400-700mg / L, some of which are as high as 1000-2000mg / L. A large amount of untreated wastewater containing high ammonia nitrogen has resulted in eutrophication of water, resulting in the proliferation of algae, hypoxia and death of fish in the water. How to efficiently treat ammonia nitrogen wastewater has become a research direction of domestic and foreign scholars. In this paper, the ammonia and nitrogen industrial wastewater discharged by a chemical fertilizer production enterprise is taken as the research object, the treatment technology of ammonia nitrogen industrial wastewater at home and abroad is summarized, and the advantages and disadvantages of the existing process are analyzed, combined with the characteristics of the wastewater discharged by the enterprise. The combined biological nitrogen removal process, which is composed of anaerobic ammonia oxidation, short cut nitrification and denitrification, anoxic and aerobic, is put forward, that is, the combined process of "A/O/O oxidation of cyanide breaking flocculation and precipitation". Based on the above treatment process, the engineering design of the ammonia nitrogen industrial wastewater is carried out, and the design parameters of each treatment process unit are determined. The structural dimensions of the water treatment structure and the supporting buildings are obtained through the design and calculation. A list of major equipment configurations is provided. At the same time, the design of buildings and public works is carried out. The project after civil construction, equipment installation and process commissioning into normal operation. Through the analysis of the continuous sampling of treated effluent, the results show that when the influent COD crn 650 mg / L NH _ 3-N ~ (2 +) (pH = 8), the CODcr=45 _ (mg / L) NH _ 3-N ~ (2 +) -N ~ (9.2) mg / L of effluent can meet the first class standard of DB41 / 538 ~ (8) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). The practical operation results show that the combined biological denitrification technology adopted in this project can effectively remove ammonia nitrogen from wastewater. The removal rates of both NH3-N and CODcr are above 90%, and the effluent reaches the standard steadily, and the annual average emission reduction of CODcr and NH3-N is 1551420kg / kg ~ 653700kg, respectively. The results show that it is feasible to treat high ammonia nitrogen industrial wastewater by the combined process of "A/O/O oxidizing cyanide decomposition flocculation precipitation", which is based on compound biological denitrification technology.
【学位授予单位】：中原工学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X781.4

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