| Water resource is not only important natural resources, but also strategic resources of the society. As the development of a large country, China’s water resource is facing a double dilemma of congenital deficiency and acquired pollution. In today’s society, petrochemical enterprise is the pillar industry of China’s economic and social development, and occupies a very important position in modern construction. However, petrochemical enterprises as typical major water users, related to the problem of water resources shortage, water pollution has seriously restricted its development, especially the petrochemical enterprises in the Reaches of Yellow River, Northwest China and North China are facing the crisis of water resources.As the economy continues to develop, Petroleum China Lanzhou petrochemical company continues to expand the scale of production, causing an increase in the type of wastewater pollutants and water quality to become complex. Therefore, the enterprise wastewater after advanced treatment and reuse is imminent. According to the petrochemical external drainage characteristics, coagulation to precipitate—O3/UV/H2O2(AOPs)—biological activated carbon adsorption process has been optimized, and the experiment determines the optimum operating parameters of the process, so that Lanzhou Petrochemical Company external drainage after advanced treatment can achieve the national standard of reuse water quality.The paper determines operation parameters by research on fractal dimension in coagulation sedimentation process. The experiment includes two major experiments "single factor of fractal dimension and fractal dimension orthogonal experimental design. The experiment researches coagulant dosage, pH value and fractal dimension with the stirring time on coagulation effect. Then according to the results of single factor experiments of fractal dimension designs orthogonal experiment of fractal dimension, and measures the effect of primary and secondary influence factors to determine the optimal portfolio. The experimental results show that the impact of various factors on coagulation results order is: coagulant dosage> stirring time> pH value. Optimal experimental condition is coagulant dosage of PAC is30mg/L, influent pH value is8, the slow mixing time is10min.AOPs experiment divided into O3/UV/H2O2optimization experiment and a biochemical effect experiment of O3/UV/H2O2. Experiments using COD and UV254as the experimental the index, by changing the ozone dosage, illumination time, influent pH value and the ratio of [H2O2]/[O3] and other conditions, studies on the removal effect of COD and UV254, in order to determine the optimal operation parameters of O3/UV/H2O2process. The experiment using BOD5/COD as indicators to study the ozone dosage and initial pH influences the wastewater biodegradability. Experimental results show:O3/UV/H2O2technique can significantly improve the biodegradability of the wastewater, and when ozone dosage is62.63mg/L, BOD5/COD goes up from0.05to0.31; the initial pH is9, BOD5/COD water reaches0.34. The optimal operation parameters of O3/UV/H2O2process is that the ozone dosage is62.63mg/L, UV illumination time is15min, the best molar ratio of [H2O2]/[O3] is0.75.Biological activated carbon adsorption experiments include biological activated carbon hung membrane experiments and biological activated carbon optimization experiments. This paper is to optimize the active carbon adsorption experiments from the water flow and the activated carbon filter layer thickness. Experiments show that:on the45day of biofilm is successful, the optimal water flow rate is0.5～1.5L/h, and better activated carbon filter layer thickness is90cm. Finally, this paper from two aspects which are the removal effect of O3/UV/H2O2-BAC and O3/UV/H2O2-BAC and activated carbon adsorption technology comparison to study advanced treatment and reuse of Lanzhou Petrochemical Company external drainage. Research shows that:O3/UV/H2O2-BAC combined technology is better than single activated carbon adsorption, and the external drainage after treating meets the national water quality standard. |
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