气田废水中有机组分的分析及非均相Fenton法处理研究

发布时间：2018-04-18 17:26

  本文选题：气田废水 + 有机组分　； 参考：《成都理工大学》2015年硕士论文

【摘要】：分析气田废水中的有机物成分,对于研究气田废水有机物的降解机制,处理工艺的选择,提高废水的处理效果等具有重要的理论和实践意义。对气田废水中有机污染物的分析,通常采用化学需氧量(COD)、生化需氧量(BOD5)、总有机碳(TOC)等综合性指标,这些指标不能反映不同气田废水的有机污染物类别和特征,对后期废水处理的指导意义不是很强。根据现有资料,人们对我国气田废水的有机组成及其特征的研究还比较少。本研究首先对采自某气田的废水进行了常规水质分析。结果显示,该废水中COD、石油类、悬浮物和浊度、硫化物、氯化物等较高;BOD5/COD只有0.11,属于难生化降解的有机废水。进一步分析显示,其中含有的有机物主要包括烷烃类、环烷烃类、芳香烃类,以及少量醇类和酮类。均相Fenton法处理这种难生化降解废水效率较高,但同时也存在二次污染的问题。根据前期分析结果,设计和研究了基于铁柱撑膨润土催化的非均相Fenton法处理工艺以解决该问题。优化后的铁柱撑膨润土催化剂合成工艺为:微波法合成,Fe/土=4mmol/g,固液比1:20;柱撑的水浴温度为40℃;nFe:nNa为1:1.5;功率为539W。将所得到的催化剂用于某气田废水中CODcr的去除,综合考虑去除率和成本等因素,处理100ml气田废水中CODcr的适宜的工艺条件为:pH≈7、H2O2加入量为1.0ml、铁柱撑膨润土加入量为1g、温度为室温,反应2h。进一步实验表明在太阳光照较为充足的条件下,太阳光对该法处理气田废水中CODcr的反应存在促进作用。所合成的催化剂经5次循环使用后对CODcr的去除率仍能达60%以上。通过对处理后废水有机物的分析,发现处理后废水中有机物的种类明显减少,含量明显降低,主要有机物(烷烃)几乎全部降解,而存在于原废水中的苯系物未得有效降解,醇类和酮类则有少部分降解。因此,该方法对主要污染物为烷烃的废水具有很好的处理效果。同时也表明,通过细致的分析来评价水处理的效果是有必要的。
[Abstract]:The analysis of organic compounds in gas field wastewater is of great theoretical and practical significance for studying the degradation mechanism of organic matter in gas field wastewater, the selection of treatment process and the improvement of wastewater treatment effect.For the analysis of organic pollutants in gas field wastewater, chemical oxygen demand (COD), biochemical oxygen demand (Bod _ 5), total organic carbon (TOC) and so on are usually used, which can not reflect the types and characteristics of organic pollutants in different gas field wastewater.It is not very important for the treatment of waste water in the later stage.According to the available data, there are few studies on the organic composition and characteristics of gas field wastewater in China.In this study, the conventional water quality of the wastewater from a gas field was analyzed.The results showed that COD, petroleum, suspended solids and turbidity, sulfides, chlorides, etc., were only 0.11% COD in the wastewater, which was a kind of organic wastewater which was difficult to biodegrade.Further analysis shows that the organic compounds mainly include alkanes, cycloalkanes, aromatic hydrocarbons, and a small amount of alcohols and ketones.The treatment of this refractory wastewater by homogeneous Fenton process is more efficient, but there is also the problem of secondary pollution at the same time.Based on the results of previous analysis, the heterogeneous Fenton process based on iron pillared bentonite was designed and studied to solve the problem.The optimized synthesis process of iron pillared bentonite catalyst is as follows: microwave synthesis of 4 mmol / g, solid-liquid ratio of 1: 20, water bath temperature of 40 鈩，

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