| With the increasingly developed economy, oil and its products have been widely used in various fields and daily life, and their usage is growing with time too. However, the emission of oil water also caused serious harm to our environment. Ordinarily, even small amount of oily wastewater emission, if without treatment, will bring heavy negative effects to the natural environment and ecological system. For example, affecting the normal growth of aquatic organisms, making the aquatic animals and plants oily or toxic, and even making water smelly, destructing the utilization value of water resources, etc, More seriously, the carcinogenic substances in oil were enriched in fish, shellfish and do harm to human health through the food chain. Therefore, it is necessary to deal with oily wastewater effectively. According to the characteristics of different types of oily wastewater, how to process it simply and efficiently, domestic and foreign scholars have conducted a lot of research, but the existing mature process still exist many shortcomings. The article mainly do study on the method which can efficiently process the oily wastewater, combining with ambient catalytic oxidation technology and sewage treatment technology, in order to overcome the disadvantages of traditional process, providing reference for engineering operation. According to the content above, this topic mainly carry out the following work:1. Modify the internal of oil-water separator technically, taking advantage of Prandtl boundary layer theory to separate oil and water, determining the influence of hydraulic retention time and the amount of flocculating oil-removal rate through the test, and carry out the primary and secondary oil removal continuous operation test under the optimal conditions, the results show that the oil-water separator can also have a good removal effect to low oil sewage, and with a wide applicability for dealing with oily wastewater. Further experimental study on the removal of SS and COD shows that the separator also has certain remove effect for the suspended matter.2. Design the efficient precipitation separator according to the shallow tank theory, combining the technique of sand filter. Determining the removal rate of SS, COD and oil through the test, the results show that the best HRT is30min, at this condition, the SS removal rate can reach90%, at the same time part of COD is removed too, and the separator on the oil removal rate can reach about15%. 3. With a special catalyst and oxidant to produce OH, in order to change the molecular structure of the petroleum aromatic compound, making the high concentration of macromolecular organic matter to decompose into small molecule organic compound, determining the aeration intensity, reaction time and the amount of AK reagent in ambient catalytic oxidation reaction based on test results. Testing the removal efficiency of COD and SS under the optimal condition of continuous-running ambient catalytic oxidation reactor, the results show that the catalytic oxidation reaction time is short, with low cost, and there’s no special requirements for pH, what’s more, COD removal rate can reach more than90%, which meet the first class discharging standard of effluent suspended solids.4. Design the filter unit by the process of adsorption-filtration, combining the self-cleaning process, the article discusses water quality and operation performance, its continuous operation of monitoring results show that the removal rate of effluent suspended solids is around85%on average, effluent COD and pH meet the first class discharging standard, and the concentration of the oil of final effluent oil is under2.5mg L-1stably, also meet the first class discharging standard. |
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